EP3451441B1 - Coaxial filter - Google Patents
Coaxial filter Download PDFInfo
- Publication number
- EP3451441B1 EP3451441B1 EP18189464.3A EP18189464A EP3451441B1 EP 3451441 B1 EP3451441 B1 EP 3451441B1 EP 18189464 A EP18189464 A EP 18189464A EP 3451441 B1 EP3451441 B1 EP 3451441B1
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- EP
- European Patent Office
- Prior art keywords
- resonator inner
- inner conductor
- arrangement
- trough
- shaped housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000004020 conductor Substances 0.000 claims description 306
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 72
- 230000008878 coupling Effects 0.000 claims description 55
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- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
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- 241001310793 Podium Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/202—Coaxial filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/04—Coaxial resonators
Definitions
- the invention relates to a coaxial filter which is constructed with very few different parts in order to facilitate manufacture.
- Filters are always used in communications engineering and high frequency technology when only certain frequency components of a signal are to be further processed.
- high-pass and low-pass filters there are also band-pass or band-stop filters.
- Filters can be implemented digitally or constructed using discrete components.
- the filters can be built on a printed circuit board or designed as coaxial filters in the form of milled or cast cavity structures. Filters with a coaxial design are mostly produced in a die-casting process, with fine-tuning being possible using additional screw-in tuning elements.
- the U.S. 6,005,455 A describes an RF filter for base stations.
- the HF filter comprises a housing in which a receiving chamber for a resonator inner conductor arrangement is provided.
- the resonator inner conductor arrangement comprises a connecting web on which individual resonator inner conductors are electrically conductively connected by their first end and run away from one another at a distance from the latter.
- the connecting web is galvanically connected to the housing.
- a microwave filter which is constructed in one piece.
- the structures that ultimately form the side walls, the base, the cover and the inner conductor of the resonator are punched from a common sheet metal. These structures are all integrally connected to one another. A bending process then takes place to form a housing structure.
- the resonator inner conductors protrude from a side wall into the receiving space.
- the US 2007/084977 A1 describes a high frequency filter.
- the RF filter comprises a housing which delimits a receiving chamber.
- a resonator inner conductor arrangement is provided in this.
- the resonator inner conductor arrangement comprises a plurality of resonator inner conductors. One end of this resonator inner conductor can be galvanically connected to the housing.
- the individual resonator inner conductors are connected to one another via a connecting web.
- a high-frequency filter which comprises a resonator inner conductor arrangement.
- This resonator inner conductor arrangement comprises a connecting web on which individual resonator inner conductors are arranged.
- the resonator inner conductor arrangement can be bent in a U-shape.
- the U.S. 3,597,709 A describes a high frequency filter. It comprises two housings which are arranged one above the other and each delimit a receiving space. Both housings are separated by a partition which has coupling openings. In each housing, resonator inner conductors are provided in the respective receiving space, the resonator inner conductors being arranged on one side wall and extending to the opposite side wall.
- the JP S58 166803 A describes a filter that consists of dielectric plates. These plates are glued to one another with their backs via a metallic carrier plate. Thus, the coupling windows formed on the rear sides of the panels overlap via a through hole drilled in the first panel. In this way, several resonators are connected in series.
- Such a filter is, for example, from DE 10 2004 010 683 B3 known.
- Such a filter has the disadvantage that the overall volume, in particular the height, is large. This leads to problems in some areas of application.
- Another high frequency filter is from the DE 43 30 491 A1 known.
- This high-frequency filter comprises two circumferential frames that are placed on top of one another and glued together.
- Resonator inner conductors which are glued to the surrounding frame, are inserted between the two surrounding frames.
- the two lid arrangements close the high frequency filter.
- the side walls and the end wall of the housing element consist of a cast and / or extrusion and / or milled part or include such a part.
- the resonator inner conductor of the at least one resonator inner conductor arrangement extend away from the connecting web on both sides.
- the connecting web is divided into different connecting web sections, the connecting web sections running offset to one another.
- the resonator inner conductor arrangement is screwed and / or clamped to the housing.
- the housing can be manufactured more cheaply than that of the prior art.
- the use of at least one trough-shaped housing element is advantageous because it can be manufactured in advance, i.e. before final assembly, and because the tolerances with regard to the respective side walls together with the end wall are many times lower than the tolerances for the housing from the state of the technique. In this case, only inadequate manufacturing tolerances can be achieved by using two separate side frames and two separate cover arrangements together with an adhesive connection.
- the solution according to the invention also reduces the number of joining or contact or transition points between different housing elements and the resonator inner conductor arrangement, which can negatively affect the electrical properties (lower losses or intermodulation). The number of possible faults or defects is therefore reduced.
- a further trough-shaped housing element allows a symmetrical structure, only a corresponding shape being required if the trough-shaped housing element is produced, for example, in a (pressure) casting process.
- Use with a cover arrangement is also advantageous because it enables a very flat housing to be realized.
- the use of the resonator inner conductor arrangement also facilitates production because all the resonator inner conductors are arranged on the common connecting web and the entire resonator inner conductor arrangement is manufactured in one piece.
- the resonator inner conductor arrangement can be produced in a separate process and measured in advance for its exact dimensions. Due to the flat structure of the resonator inner conductor arrangement, it is ideally suited for use in the housing described above.
- the coaxial filter is made up of only three parts, which means that the overall height is very low.
- the coaxial filter can be produced in a casting process, in particular in an (aluminum or zinc) die-casting process. The production can also take place in a milling process or in an extrusion process. Such a coaxial filter can be used in particular for outputs of 5 to 20 watts. The performance can also be lower or higher.
- the housing and / or the resonator inner conductor arrangement could also be made of plastic, which would then have to be provided with an electrically conductive layer.
- the at least one resonator inner conductor arrangement preferably consists of a sheet metal which can be punched, lasered, milled, drilled and / or printed.
- the at least one resonator inner conductor arrangement can on the one hand be galvanically separated from the housing or galvanically connected to it.
- the second end of the resonator inner conductor is preferably kept at a distance from the housing, the resonator inner conductor arrangement, in particular the individual resonator inner conductor, running centrally through the receiving space and being equidistant from the end faces or the cover arrangement.
- the resonator inner conductor arrangement is in particular soldered and / or screwed and / or clamped to the housing, but not glued (non-adhesive). An eccentric course would also be possible.
- the resonator inner conductor arrangement can provide a low-pass or band-pass or band-stop or high-pass characteristic. It can also be an interconnected filter with which several frequency ranges can be served.
- the coaxial filter can be used as a diplexer or multiplexer or duplexer.
- the resonator inner conductor arrangement preferably has a homogeneous thickness. This is preferably greater than 0.2 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, but more preferably smaller than 5mm, 4mm, 3mm, 2mm, 1mm, 0.8mm, 0.6mm.
- the area of the top or bottom of the resonator inner conductor arrangement is many times (more than 3, 5, 7, 9, 11, 13, 15, 17, 19 times) larger than the side surface of the resonator inner conductor arrangement.
- the coaxial filter comprises a conductive separating web, which arises on one side wall of both trough-shaped housing elements placed on top of one another if the housing comprises a further trough-shaped housing element, or on the one trough-shaped housing element if the housing comprises a cover arrangement and in the direction of the opposite one Sidewall runs.
- the receiving space is divided into two receiving chambers which are connected to one another via an opening.
- the common connecting web of the resonator inner conductor arrangement preferably rests on the separating web, so that the individual resonator inner conductors protrude into different receiving chambers.
- a duplexer with filter paths which are predominantly decoupled from one another can be created in a very advantageous manner.
- an additional resonator inner conductor arrangement is formed, wherein the one resonator inner conductor arrangement is fastened to the end wall of the trough-shaped housing element and the further resonator inner conductor arrangement is fastened to the end wall of the further trough-shaped housing element (e.g. directly or via Platform arrangements or spacers).
- An additional trough-shaped housing element could also be provided, the end wall of the trough-shaped housing element being placed on the end faces of its side walls, which is closed with a cover arrangement, whereby a further receiving space is formed. The further resonator inner conductor arrangement is then arranged in this further receiving space.
- At least one coupling opening is made in the end wall of the trough-shaped housing element, which is closed with the cover arrangement, so that electrical coupling between the individual resonator inner conductor arrangements in the different receiving spaces is possible.
- the coaxial filter can be expanded as required in order to be able to attach additional coupling and decoupling devices.
- FIG. 1 shows a simplified representation of the coaxial filter 1 according to the invention.
- the coaxial filter 1 comprises a housing 2 which delimits a common receiving space 5.
- the housing 2 consists of an electrically conductive material and comprises a trough-shaped housing element 2a, which comprises side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 .
- the trough-shaped housing element 2a also comprises an end wall 4a, all side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 being formed in one piece with the end wall 4a.
- a space 5a between the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 is closed on one side by the end wall 4a.
- the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 delimit the space 5a or receiving space 5 all around.
- the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 also represent the outer walls of the housing 2 at the same time.
- the trough-shaped housing element 2a has a rectangular outline, in particular a longitudinal section.
- the side walls 3a 1 to 3a 4 preferably run perpendicular to the end wall 4a. However, they could also run obliquely to the end wall 4a.
- the individual side walls 4a 1 to 4a 4 run at right angles to one another. The corners formed in this way could, however, also be rounded. Other basic forms are also conceivable.
- the coaxial filter 1 can also be designed square, oval or circular in a plan view of a longitudinal section.
- the individual side walls 4a 1 to 4a 4 can also have a stepped profile, as shown in FIG Figure 2 is shown.
- the trough-shaped housing element 2a consists of a material or comprises a material that is electrically conductive.
- FIG 1 the open housing 2 is shown.
- a further trough-shaped housing element 2b is used, which is preferably constructed identically to the trough-shaped housing element 2a already described.
- the further tub-shaped housing element 2b which can be found in Figure 5A also includes (circumferential) side walls 3b 1 , 3b 2 , 3b 3 and 3b 4 and an end wall 4b with a further space 5b between the side walls 3bi, 3b 2 , 3b 3 and 3b 4 on one side through the end wall 4b is completed.
- the side walls 3bi, 3b 2 , 3b 3 and 3b 4 are formed in one piece with the end wall 4b.
- the end wall 4b of the further trough-shaped housing element 2b therefore closes off the further space 5b between the side walls 3b 1 , 3b 2 , 3b 3 and 3b 4 on one side (end face) thereof.
- the side walls 3b 1 , 3b 2 , 3b 3 and 3b 4 also represent the outer walls of the housing 2 at the same time.
- the two trough-shaped housing elements 2a, 2b are placed one on top of the other with their open sides.
- the end faces of the side walls 3a 1 to 3a 4 and 3bi to 3b 4 of the two trough-shaped housing elements 2a, 2b preferably touch one another.
- the side walls 3a 1 to 3a 4 and 3bi to 3b 4 of both trough-shaped housing elements 2a, 2b run between the respective end walls 4a, 4b, whereby the receiving space 5 is limited, which is formed by the two spaces 5a, 5b.
- Such a composite housing 2 can, for example, the Figure 5A can be removed.
- Both trough-shaped housing elements 2a, 2b are preferably screwed and / or soldered to one another.
- the housing elements 2a, 2b can also be connected to one another differently (galvanically). Depending on the requirements for shielding to the outside, the connection does not necessarily have to be galvanic.
- the housing elements 2a, 2b can also be connected in a moisture-tight manner.
- one trough-shaped housing element 2a can also be closed with a cover arrangement 2c, the side walls 3a 1 to 3a 4 running between the end wall 4a and the cover arrangement 2c and the receiving space 5, which is formed by the space 5a, limit.
- a cover arrangement 2c is preferably designed in one piece and, like the trough-shaped housing element 2a, consists of an electrically conductive material.
- the cover arrangement 2c could also consist of a dielectric which is coated on at least one side with an electrically conductive layer.
- a cover arrangement 2c is preferably plate-shaped and does not delimit any space itself. It extends itself only in one plane.
- At least one resonator inner conductor arrangement 6, 6a embodied in one piece is provided, which is arranged in the receiving space 5.
- the at least one resonator inner conductor arrangement 6, 6a comprises several resonator inner conductors 7a, 7b, ... 7n with n ⁇ 2, 3, 4, 5, 6, 7, 8, 9, 10 and n element of the natural numbers, the preferably all lie in the same plane.
- the resonator inner conductors 7a to 7n each include a first end 8 and a second end 9 spaced from the first end 8.
- the resonator inner conductors 7a to 7n run with one component parallel or predominantly parallel to an end wall 4a, 4b or to the cover arrangement 2c .
- the at least one resonator inner conductor arrangement 6, 6a also comprises a (common) connecting web 10, on which the resonator inner conductors 7a to 7n are electrically conductively connected with their first end 8.
- the individual resonator inner conductors 7a to 7n run parallel to one another and parallel to at least one side wall 3a 2 or 3a 4 .
- the resonator inner conductor arrangement 6, 6a is in particular free of a surrounding frame in which the multiple resonator inner conductors 7a, 7b,... 7n and the connecting web 10 are arranged and which is formed in one piece on the connecting web 10.
- the connecting web 10 of the resonator inner conductor arrangement 6, 6a extends over more than 60%, 70%, 80%, 90% or 95% of the length of a side wall 3a 1 , 3a 2 , 3a 3 and 3a 4 , which also forms an outer wall, along and parallel to this.
- the receiving space 5 extends over the entire length and / or width of the coaxial filter 1 (minus the thickness of the respective side wall 3a 1 , 3a 2 , 3a 3 and 3a 4 ).
- the individual resonator inner conductors 7a to 7n are spaced apart from one another by a predetermined distance. At least two adjacent resonator inner conductors 7a to 7n, which extend away from the connecting web 10 in the same direction, are in visual contact with one another over their entire length or over their predominant length (more than 50%, 60%, 70% or 80%). This means that the housing 2 is just not in the space immersed between two adjacent resonator inner conductors 7a to 7n, whereby the coupling between two adjacent resonator inner conductors 7a to 7n would be greatly reduced.
- All resonator inner conductors 7a to 7n extend in Figure 1 away from the same side of the connecting web 10.
- the connecting web 10 preferably runs parallel to a side wall 3a 1 or 3a 3 of the trough-shaped housing element 2a.
- the connecting web 10 is preferably arranged closer to a side wall 3a 3 , to which it runs parallel or with one component predominantly parallel, than to another side wall 3a 1 , to which it also runs parallel or predominantly parallel.
- the connecting web has a length which preferably corresponds to more than 50%, 60%, 70%, 80% or 90% of the length of the side wall 3a 1 or 3a 3 , to which it runs parallel.
- the connecting web 10 is, however, preferably shorter than the corresponding side wall 3a 1 or 3a 3 to which it runs parallel.
- the width of the connecting web 10 is preferably greater than the width of at least one or all of the resonator inner conductors 7a to 7n. However, it could also be the same or smaller.
- the width of the connecting web 10 at the beginning and at the end of the connecting web 10 is greater than in a region between the beginning and the end of the connecting web 10.
- the resonator inner conductor arrangement 6, 6a consists of a stamped and / or lasered and / or bent and / or milled and / or printed sheet metal.
- a carrier material for the actual filter structure, as used in microstrip structures, is not required. This means that the resonator inner conductor arrangement 6, 6a is free of carrier material. Dispensing with a carrier material also reduces electrical losses, which improves the filter. In particular, the resonator inner conductor arrangement 6, 6a is free of circuit boards.
- the resonator inner conductor arrangement 6, 6a is preferably made of a different material than the housing 2. It could also be made of the same material such as aluminum. However, the resonator inner conductor arrangement 6, 6a and the housing 2 do not consist of one and the same part or workpiece. They therefore consist of different workpieces. These are not formed in one piece with one another. These are produced in separate processes. The resonator inner conductor arrangement 6, 6a and the trough-shaped housing element 2a or 2b or the cover arrangement 2c are not produced from a common workpiece or part. This means that the resonator inner conductor arrangement 6, 6a is manufactured separately and inserted into the receiving space 5 of the housing 2.
- the insertion of the resonator inner conductor arrangement 6, 6a into the one trough-shaped housing element 2a is only possible via an opening which is closed by the further trough-shaped housing element 2b or the cover arrangement 2c. All other openings for insertion are closed by the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 and the end wall 4a.
- the resonator inner conductor arrangement 6, 6a is held at a distance from the end faces 4a, 4b and the cover arrangement 2c.
- the resonator inner conductors 7a to 7n are kept at a distance from the housing 2, in particular from the end walls 4a, 4b or the cover arrangement 2c.
- the resonator inner conductor arrangement 6, 6a is arranged in the receiving space 5 which is delimited directly by the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 or 3bi, 3b 2 , 3b 3 and 3b 4 .
- the receiving space 5 always includes boundary walls, which are the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 or 3bi, 3b 2 , 3b 3 and 3b 4 , which also represent the outer walls of the housing 2.
- the at least one resonator inner conductor arrangement 6, 6a is preferably soldered and / or screwed and / or clamped to the housing 2. This is preferably a galvanic connection. But this is not mandatory.
- the resonator inner conductor arrangement 6, 6a can also rest on a pedestal arrangement 11.
- Such a pedestal arrangement 11 is in view of Figures 3A to 3D explained in more detail.
- the pedestal arrangement 11 comprises a plurality of individual pedestals spaced apart from one another.
- the pedestal arrangement 11 comprises a dielectric material and / or an electrically conductive material. In principle, the dielectric material could also be coated with an electrically conductive layer or vice versa be.
- the pedestal arrangement 11 which consists of several individual pedestals which have a round shape in cross section, is formed in one piece on at least one end wall 4a, 4b.
- the individual platforms are arranged at a distance from the side walls 3a 1 , 3a 2 , 3a 3 , 3a 4 . In principle, it could also be formed on the cover arrangement 2c.
- the individual platforms are preferably arranged at the same distance from one another.
- the resonator inner conductor arrangement 6, 6a preferably does not touch the housing 2 and is only held at a distance from the housing 2 by the pedestal arrangement 11.
- these individual platforms also have an extension in the direction of the respective side wall 3a 1 to 3a 4 or 3b 1 to 3b 4 .
- the pedestal arrangement 11 shown is preferably formed in one piece with the corresponding side wall 3a 1 to 3a 4 or 3bi to 3b 4 of the at least one trough-shaped housing element 2a or 2b. It can also be designed in one piece on the corresponding end wall 4a or 4b. In this case, the pedestal arrangement 11 consists of the same electrically conductive material from which the trough-shaped housing elements 4a, 4b also consist.
- the pedestal arrangement 11 comprises a continuous pedestal which extends along at least 50% of the length of a side wall 3a 1 or 3a 3 or 3b 1 , 3b 3 .
- the continuous platform extends parallel or with one component predominantly parallel to the corresponding side wall 3a 1 , 3a 3 or 3b 1 , 3b 3 .
- Figure 3D combines the exemplary embodiments Figure 3B and 3C .
- the continuous platform Figure 3C which is arranged at a distance from the side walls 3a 1 to 3a 4 or 3bi to 3b 4 , is additionally galvanically and in particular integrally connected to at least one side wall 3a 1 to 3a 4 or 3bi to 3b 4 via connecting segments.
- This platform arrangement 11 is also preferably connected in one piece with the end wall 4a and / or at least one side wall 3a 1 to 3a 4 of the trough-shaped housing element 2a or with the end wall 4b and / or at least one side wall 3bi to 3b 4 of the further trough-shaped housing element 2b.
- the at least one resonator inner conductor arrangement 6, 6a rests on the at least one pedestal arrangement 11.
- the resonator inner conductor arrangement is preferably located 6 only on its connecting web 10 on the pedestal arrangement 11. This fact is for example in Figure 1 shown.
- Figure 2 shows a further embodiment of the coaxial filter 1 according to the invention run in one plane to each other.
- the individual connecting web sections 10a to 10n are spaced at different distances from the side walls 3a 1 , 3a 3 or 3b 1 , 3b 3 , to which they run parallel or with one component predominantly parallel.
- the resonator inner conductor 7a to 7n of the at least one resonator inner conductor arrangement 6, 6a extend in Figure 2 away from the connecting web 6 on both sides.
- the resonator inner conductor arrangement 6, 6a lies in Figure 2 not on their connecting web 10 on the at least one pedestal arrangement 11, but on the second end 9 of those resonator inner conductors 7a to 7n which extend along a direction away from the common connecting web 10. However, it would also be possible for the connecting web 10 to rest on the at least one pedestal arrangement 11.
- the resonator inner conductors 7a to 7n which extend along one direction from the common connecting web 10, are spaced along a partial length of the connecting web 10 at different distances from the side wall 3a 1 or 3bi to which they run, whereas they are spaced over a different partial length of the connecting web 10, from which they protrude, are spaced equidistant from the corresponding side wall 3a 1 or 3bi to which they run. Furthermore, those resonator inner conductors 7a to 7n, which are on another side of the common connecting web 10 in the direction of corresponding side wall 3a 3 or 3b 3 extend away, equidistant from this side wall 3a 3 or 3b 3 .
- a first, a second and a third coupling and / or decoupling device 12a, 12b and 12c are also provided, which are arranged at different points on the housing 2 and protrude from outside the housing 2 into the receiving space 5 and a capacitive or inductive or galvanic or produce predominantly capacitive or predominantly inductive or predominantly galvanic coupling to different resonator inner conductors 7a to 7n of the at least one resonator inner conductor arrangement 6, 6a.
- the first and second coupling and / or decoupling devices 12a, 12b are preferably coupled to the resonator inner conductors 7a, 7n, which are arranged at the beginning and at the end of the common connecting web 10.
- the third coupling and / or decoupling device 12c which is preferably arranged perpendicular to the other coupling and / or decoupling devices 12a, 12b, is coupled to a resonator inner conductor which is located between the outermost resonator inner conductors 7a, 7n (in particular in the middle).
- the distance between the individual coupling and / or decoupling devices 12a, 12b, 12c from the respective resonator inner conductor is preferably less than 5 cm, 4 cm, 3 cm, 2 cm, 1 cm, 0.5 cm.
- the coaxial filter 1 preferably works as a duplex filter.
- the coupling and / or decoupling devices 12a, 12b, 12c can also be referred to as coupling and / or decoupling connections 12a, 12b, 12c. These are preferably sockets or plugs, which are placed on the housing 2 from the outside in particular and are screwed to it. Preferably, no printed circuit board is arranged between the coupling and / or decoupling devices 12a, 12b, 12c and the at least one resonator inner conductor arrangement 6, 6a.
- At least one or all of the resonator inner conductors 7a to 7n of the at least one resonator inner conductor arrangement 6, 6a extend obliquely away from the common connecting web 10.
- the smaller angle ⁇ between the resonator inner conductors 7a to 7n and the common connecting web 10 has a size of more than 10 °, 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, but of less than 85 °, 75 °, 65 °, 55 °, 45 °, 35 °, 25 °, 15 °, 5 °.
- Each of the resonator inner conductors 7a to 7n can be divided into individual sections, which in turn run towards one another at an angle. In this case the corresponding inner conductor of the resonator would be kinked. However, all of these sections run at an angle of less than 90 ° to the connecting web 10.
- the resonator inner conductors 7a to 7n run away from the connecting web 10 at right angles. They are all the same length.
- the second end 9 of at least one or all of the resonator inner conductors 7a to 7n is angled (for example 90 °).
- the angled section preferably runs parallel to the side wall 3a 1 or 3a 3 or 3bi or 3b 3 , in the direction of which the individual resonator inner conductors 7a to 7n extend from the common connecting web 10.
- the angling enables the electrically effective length of the resonator inner conductors 7a to 7n, which also determine the corresponding resonance frequencies and thus the frequency range of the coaxial filter 1, to remain the same, while the side walls 3a 2 and 3a 4 (or 3b 2 and 3b 4 ) are shorter can be and the installation space of the coaxial filter 1 can be reduced in this dimension.
- the resonator inner conductors 7a to 7n have an L-shape or are approximated to such a shape.
- the angled section runs in the same direction in all resonator inner conductors.
- the angled section of two adjacent resonator inner conductors 7a to 7n could also point to the respectively adjacent section, as shown in FIG Figure 4I is shown. This creates an increased (capacitive) coupling at the second end 9 of two adjacent resonator inner conductors 7a to 7n.
- the two ends 9 of two adjacent resonator inner conductors 7a to 7n therefore run towards one another.
- the angled sections with the second end 9 of the resonator inner conductor 7a to 7n could also run at an angle not equal to 90 ° with respect to the remaining section of the resonator inner conductor 7a to 7n.
- the second end 9 of at least one, preferably all of the resonator inner conductors 7a to 7n is double-angled and the corresponding resonator inner conductor 7a to 7n in particular has a T-shape or approximates such a shape.
- Both sections of the resonator inner conductor 7a to 7n therefore run in the direction of two opposing side walls 3a 2 , 3a 4 and 3b 2 , 3b 4, respectively.
- the capacitive coupling between the individual adjacent resonator inner conductors 7a to 7n is also increased.
- the second end 9 of at least one or all of the resonator inner conductors 7a to 7n has a double-angled shape.
- the resonator inner conductors 7a to 7n have a U-shape or are approximated to such a shape. This means that the second end 9 of the resonator inner conductor runs back in the direction of the first end 8. This not only increases the electrical length of the individual resonator inner conductor.
- the coupling between two adjacent resonator inner conductors 7a to 7n and the coupling to the housing 2 are also increased.
- the second end 9 of one or all of the resonator inner conductors 7a to 7n has an enlarged section.
- the second end 9 has an enlarged width which is circular in plan view or at least approximates a circular shape.
- the second end 9 can also be square or hexagonal or otherwise widened.
- a resonator inner conductor arrangement 6, 6a is shown, through which the coaxial filter works as a bandstop filter.
- At least two resonator inner conductors 7a to 7n or all resonator inner conductors 7a to 7n of the at least one resonator inner conductor arrangement 6, 6a have a width over a first partial length 13a, preferably starting at the first end 8, than over a second partial length 13b, which preferably ends at the second end 9. Both partial lengths 13a, 13b together preferably result in the total length of the resonator inner conductor 7a to 7n.
- the first partial length 13a can be of different lengths in at least two or all resonator inner conductors 7a to 7n.
- the first partial length 13a or the second partial length 13b can also be of the same length for all resonator inner conductors 7a to 7n.
- the resonator inner conductor 7a to 7n is approximately more than 1.5 or 2 or 2.5 or 3 or 3.5 or 4 times as wide over the second partial length 13b as in the case of the first partial length 13a.
- the common connecting web 10 is approximately as wide as the resonator inner conductor 7a to 7n.
- the wording "approximately” is to be understood to include a deviation of less than 25%, 20%, 15%, 10% or less than 5%.
- Figure 4G shows a resonator inner conductor arrangement 6, 6a, by means of which the coaxial filter 1 can be operated as a low-pass filter.
- the at least one resonator inner conductor arrangement 6, 6a is constructed mirror-symmetrically in this case, the mirror axis running through the connecting web 10 and the connecting web 10 being several times narrower than the resonator inner conductors 7a to 7n.
- Such a mirror-symmetrical arrangement means that the resonator inner conductors 7a to 7n run on two sides from the common connecting web 10 in the direction of the opposite side wall 3a 1 , 3a 3 or 3b 1 , 3b 3 .
- the length of at least two resonator inner conductors 7a to 7n is different.
- the same also applies to the width of at least two resonator inner conductors 7a to 7n.
- the distance between two adjacent resonator inner conductors 7a to 7n can also be different.
- a structure that is not mirror-symmetrical would also be possible.
- the resonator inner conductor arrangement 6, 6a rests on a pedestal arrangement 11, not shown, which in this case consists of a dielectric material or comprises such a material.
- the structure of the resonator inner conductor arrangement 6, 6a in Figure 4H essentially corresponds to the one from Figure 2 .
- the resonator inner conductor arrangement 6, 6a lies on the second end 9 of its resonator inner conductor 7a to 7n on the pedestal arrangement 11.
- the common connecting web 10 does not run through a straight line here, but is divided into connecting web sections 10a to 10n which are offset from one another.
- Figure 4J shows a cross-coupling between two non-adjacent resonator inner conductors 7a to 7n. In this case, a capacitive coupling is shown.
- the capacitive coupling is formed by a coupling element 14 which has at least two capacitive coupling surfaces 14a, 14b that are galvanically connected to one another.
- Each of these capacitive coupling surfaces 14a 14b preferably runs parallel or with one component predominantly parallel to the respective resonator inner conductor 7a to 7n.
- the coupling surfaces 14a, 14b are preferably closer to the second end 9 of the respective resonator inner conductor 7a to 7n than to the first end 8.
- the capacitive coupling surfaces 14a, 14b are between the resonator inner conductor 7a to 7n and the respective end wall 4a, 4b or the cover arrangement 2c.
- the coupling element 14 is galvanically separated from the resonator inner conductors 7 a to 7 n and the housing 2.
- a dielectric, on which the capacitive coupling surfaces 14a, 14b rest, can also be arranged between the capacitive coupling surfaces 14a, 14b and the resonator inner conductors 7a to 7n.
- An inductive coupling would also be possible, this being preferably formed by a coupling rod (not shown). This would then be galvanically connected to two non-adjacent resonator inner conductors 7a to 7n, for example soldered. The arrangement would be the same as for the coupling element 14.
- An inductive coupling between two adjacent resonator inner conductors 7a to 7n could also take place in that the connecting web 10 between these two resonator inner conductors 7a to 7n is wider than between two other resonator inner conductors 7a to 7n.
- a coupling between two adjacent resonator inner conductors 7a to 7n generally exists both via their line of sight and via the corresponding part of the connecting web 10.
- the coupling can also be varied, for example, by changing the distances between the adjacent resonator inner conductors 7a to 7n or by varying the position (closer to the base point or closer to the open end) or by varying the shape (for example thinner or thicker) of the respective connecting web section 10a to 10n.
- FIG. 6 shows a further embodiment of the coaxial filter 1 according to the invention.
- the coaxial filter 1 also includes an additional trough-shaped housing element 2b.
- This additional trough-shaped housing element 2b is constructed like the trough-shaped housing element 2a already described.
- the space 5b which is delimited by the side walls 3bi to 3b 4 , is additionally delimited by the end wall 4b and the end wall 4a of the trough-shaped housing element 2a lying above it.
- a resonator inner conductor arrangement 6, 6a, 6b is arranged in each of the two spaces 5a, 5b.
- the end wall 4a of the trough-shaped housing element 2a, which separates the two spaces 5a, 5b from one another, preferably comprises a coupling opening 15 (see FIG. Figure 8P ), whereby the individual resonator inner conductor arrangements 6, 6a, 6b are partially coupled to one another.
- FIGS. 7A and 7B show a further embodiment of the coaxial filter 1 according to the invention.
- an electrically conductive separating web 20 extends from a side wall 3a 1 to 3a 4 or 3b 1 to 3b 4 in the direction of an opposite side wall 3a 1 to 3a 4 or 3b 1 to 3b 4 and ends there with the formation of an opening 21 with this, whereby the receiving space 5 in at least a first receiving chamber 5 1 and in a second receiving chamber 5 2 and the , the opening 21 connecting at least two receiving chambers 5 1 , 5 2 is divided.
- the separating web 20 is preferably formed in one piece with the corresponding trough-shaped housing element 2a, 2b and is also electrically conductive.
- the individual receiving chambers 5 1 , 5 2 are connected or coupled to one another directly via the opening 21 and without the interposition of a further chamber.
- the opening 21 is preferably free of parts of the resonator inner conductor arrangement 6, 6a, 6b, such as, for example, the resonator inner conductors 7a to 7n.
- the opening 21 preferably extends over the entire height of the receiving space 5 or preferably at least up to the respective end wall 4a, 4b.
- a separating web 20 which runs from a side wall 3a 1 to 3a 4 in the direction of the opposite side wall 3a 1 to 3a 4 and ends at a distance from this, forming an opening 21.
- the separating web 20 is electrically conductive, preferably connected in one piece to the side wall 3 a 1 to 3 a 4 .
- the common connecting web 10 preferably rests on the separating web 20.
- the individual resonator inner conductors 7a to 7n of the at least one resonator inner conductor arrangement 10 then extend into the first and second receiving chambers 5 1 , 5 2 of the receiving space 5.
- the common connecting web 10 is preferably arranged between the two separating webs 20 and further preferably pressed and / or screwed and / or soldered to it.
- Figure 7A shows a longitudinal section through a trough-shaped housing element 2a, 2b
- Figure 7B shows a plan view of a trough-shaped housing element 2a or 2b, on the separating web of which the resonator inner conductor arrangement 6, 6a is placed.
- the individual resonator inner conductors 7a to 7n extend away from the common connecting web 10 in two different directions and end in the first and in the second receiving chamber 5 1 , 5 2 of the receiving space 5.
- the common connecting web 10 is preferably arranged between the separating web 20 and the cover arrangement 2c, more preferably clamped or pressed and / or soldered and / or screwed to them.
- the first end 8 of the respective resonator inner conductors 7a to 7n comprises, for example, a segment which is bent in the direction of the end wall 4a so that the resonator inner conductors 7a to 7n run over the major part of their length at a predetermined distance from the cover arrangement 2c .
- the distance from the cover arrangement 2c is preferably more than 10% or 20% or 30% or 40% of the distance between the end face 4a and the cover arrangement 2c.
- Figure 8A it is shown that the resonator inner conductor arrangement 6, 6a is galvanically connected to the housing 2.
- Figure 8A shows a housing 2, which consists of two trough-shaped housing elements 2a, 2b, the side walls 3a 1 to 3a 4 and 3bi to 3b 4 of which are placed on top of one another and are surrounded by the respective end walls 4a, 4b. It is true that a gap (right part) is still shown between the two trough-shaped housing elements 2a, 2b. This, however, serves more for illustration purposes, in order to emphasize that these two trough-shaped housing elements 4a, 4b are not formed in one piece with one another.
- the resonator inner conductor arrangement 6, 6a runs centrally through the receiving space 5.
- the at least one resonator inner conductor arrangement 6, 6a is clamped and / or screwed between the two trough-shaped housing elements 2a, 2b. More precisely, a platform arrangement 11 extends from each trough-shaped housing element 2a, 2b into the receiving space 5.
- the resonator inner conductor arrangement 6, 6a is arranged between the two pedestal arrangements 11.
- the platform arrangements 11 have corresponding support shoulders 25, on which the resonator inner conductor arrangement 6, 6a, in particular with their common connecting web 10, rests.
- the resonator inner conductor arrangement 6, 6a preferably only comes into contact with the pedestal arrangements 11.
- the resonator inner conductor arrangement 6, 6a is preferably not arranged or clamped between side walls 3a 1 , 3a 2 , 3a 3 , 3a 4 , 3b 1 , 3b 2 , 3b 3 , 3b 4 of the trough-shaped housing elements 2a, 2b.
- the resonator inner conductor arrangement 6, 6a is preferably arranged exclusively within the receiving space 5 and at a distance from the side walls 3a 1 , 3a 2 , 3a 3 , 3a 4 , 3b 1 , 3b 2 , 3b 3 , 3b 4 of the trough-shaped housing elements 2a, 2b.
- the pedestal arrangement 11 is at least partially penetrated by a fastening opening 28 and preferably has a thread.
- a screw 26 with a screw body 26a and a screw head 26b engages in the two pedestal arrangements 11.
- Both pedestal arrangements 11, that is to say both trough-shaped housing elements 2a, 2b, are pressed towards one another. Only that pedestal arrangement 11 of the two pedestal arrangements 11 is designed with a thread, which is further spaced from the screw head 26b.
- the screw body 26a also penetrates the resonator inner conductor arrangement 6, 6a. This is preferably designed exclusively thread-free.
- the opening 27 in the resonator inner conductor arrangement 6, 6a is larger than the diameter of the screw body 26a.
- the screw head 26b is arranged outside the housing 2.
- the housing 2 comprises, in particular, the further trough-shaped housing element 2b, an indentation in which the screw head 26b is arranged so that it does not protrude beyond the remaining end wall 4b of the housing element 2b.
- the screw head 26b is therefore countersunk in a receiving space accessible from the outside in one of the two housing elements 2a, 2b.
- the pedestal arrangements 11 are preferably designed in one piece on the respective end walls 4a, 4b and spaced apart from the side walls 3a 1 , 3a 2 , 3a 3 , 3a 4 , 3b 1 , 3b 2 , 3b 3 , 3b 4 of the trough-shaped housing elements 2a, 2b .
- the pedestal arrangements 11 preferably touch (contact) the resonator inner conductor arrangement 6, 6a directly without a dielectric being arranged in between.
- FIG 8B a cross section through a housing 2 is shown, which consists of a trough-shaped housing element 2a and a cover arrangement 2c.
- the resonator inner conductor arrangement 6, 6a in turn rests on a pedestal arrangement 11.
- the pedestal arrangement 11 extends from the end face 4a of the trough-shaped housing element 2a into the receiving space 5.
- the pedestal arrangement 11 is in turn penetrated completely by a fastening opening 28 which has a thread.
- a spacer 30 is also arranged between the resonator inner conductor arrangement 6, 6a and the housing cover 2c.
- the at least one resonator inner conductor arrangement 6, 6a is therefore between the pedestal arrangement 11 and the at least one spacer 30 clamped.
- the spacer 30 can consist of a dielectric material or of an electrically conductive material.
- the fastening opening 28, into which the screw connection 26 at least partially engages, continues through the resonator inner conductor arrangement 6, 6a and the at least one spacer 30 and the cover arrangement 2c.
- the screw body enters from outside the housing 2 through the fastening opening 28 in the cover arrangement 2c and penetrates the spacer 30 and the resonator inner conductor arrangement 6, 6a completely and the pedestal arrangement 11 at least partially.
- the screw head 26b is arranged outside the housing 2 on an outside of the cover arrangement 2c.
- FIG Figure 8C shows a similar embodiment to that of FIG Figure 8A .
- both platform arrangements 11 comprise a receiving space that is at least partially accessible from the outside.
- the screw head 26b is arranged in the one receiving space.
- a nut 26c is arranged, which is in engagement with the screw body 26a.
- the fastening openings 28 are designed without threads.
- Figure 8D corresponds to the embodiment from Figure 8A .
- the screw connection 26 penetrates a side wall 3a 1 to 3a 4 or 3b 1 to 3b 4 of a trough-shaped housing element 2a, 2b.
- the pedestal arrangement 11 is located in each trough-shaped housing element 2a, 2b both on the respective end face 4a, 4b and on the respective side wall 3a 1 to 3a 4 or 3b 1 to 3b 4 .
- the cross section through the coaxial filter 1 according to the invention according to FIG Figure 8E shows that the resonator inner conductor arrangement 6, 6a is soldered to the housing 2, in particular to both trough-shaped housing elements 2a, 2b and there in particular to the respective pedestal arrangements 11 running towards one another.
- the structure corresponds roughly to that of Figure 8A , whereby a screw connection 26 has been dispensed with.
- the platform arrangements 11 run from the end walls 4a, 4b into the receiving space 5.
- the podium arrangements 11 are in turn penetrated by the fastening opening 28. This fastening opening 28 also penetrates the Resonator inner conductor arrangement 6, 6a.
- the pedestal arrangements 11 each include an end face, the two end faces of the pedestal arrangements 11 facing one another.
- the resonator inner conductor arrangement 6, 6a lies on these end faces or is clamped between these end faces.
- a soldered connection 35 is formed on the inner wall formed by the fastening opening 28 in the resonator inner conductor arrangement 6, 6a and on the respective end faces of the pedestal arrangements 11. This solder deposit 35 is accessible via the fastening openings 28 in the pedestal arrangements 11.
- FIG 8F shows a similar embodiment as Figure 8E .
- the resonator inner conductor arrangement 6, 6a is not penetrated by the fastening opening 28.
- a soldered connection 35 takes place between the top and bottom of the resonator inner conductor arrangement 6, 6a, in particular the common connecting web 10 and the respective pedestal arrangements 11 of the two trough-shaped housing elements 2a, 2b.
- the soldered connections 35 are not accessible via the fastening opening 28, but only via the corresponding receiving space 5.
- the soldered connections 35 can be produced, for example, from a pre-inserted solder preform. This applies to all soldered connections 35.
- the soldered connections 35 can be melted, for example, by inductive soldering or by heating in a reflow oven. These soldered connections 35 rest in a stepped shoulder in the respective pedestal arrangements 11.
- Figure 8G shows a further exemplary embodiment of the coaxial filter 1.
- the resonator inner conductor arrangement 6, 6a rests on a pedestal arrangement 11 which extends from an end wall 4a, 4b into the receiving space 5.
- the pedestal arrangement 11 has a projection 36 which passes through an opening in the resonator inner conductor arrangement 6, 6a and is surrounded by support shoulders on which, in addition to a solder deposit 35, part of the resonator inner conductor arrangement 6, 6a, in particular a part of the common connecting web 10 is arranged.
- Figure 8H shows a similar embodiment as Figure 8G .
- the pedestal arrangement 11 is, however, formed both on the end wall 4a and on one or more of the side walls 3a 1 to 3a 4 and extends into the receiving space 5.
- a cover arrangement 2c is provided instead of a second trough-shaped housing element 2b.
- the resonator inner conductor arrangement 6, 6a rests on the pedestal arrangement 11. The same also applies to a solder deposit 35, via which the resonator inner conductor arrangement 6, 6a can be soldered to the pedestal arrangement 11.
- the pedestal arrangement 11 is a plurality of non-interconnected individual pedestals or a continuous pedestal.
- Figure 8I shows that the resonator inner conductor arrangement 6, 6a is soldered to one or more side walls 3a 1 to 3a 4 of the trough-shaped housing element 2a.
- the distance between the resonator inner conductor arrangement 6, 6a and the end wall 4a is approximately the same as the distance between the resonator inner conductor arrangement 6, 6a and the cover arrangement 2c.
- the wording “approximately” is to be understood to the effect that a difference between the two distances is preferably less than 10%, more preferably less than 5%.
- Figure 8J describes a further exemplary embodiment of how the resonator inner conductor arrangement 6, 6a can be soldered to the housing 2.
- the resonator inner conductor arrangement 6, 6a has a segment 38, which is bent towards the end face 4a of the at least one trough-shaped housing element 2a and soldered to it, at least with respect to the predominant part of the resonator inner conductor 7a to 7n.
- This segment 38 is preferably the common connecting web 10.
- this segment 38 does not run in the direction of the end face 4a, but in the direction of the cover arrangement 2c.
- the cover arrangement 2c preferably has an opening, as a result of which part of the resonator inner conductor arrangement 6, 6a protrudes therefrom and is soldered to the cover arrangement 2c outside the housing 2.
- Figure 8L shows a similar embodiment as Figure 8H .
- the resonator inner conductor arrangement 6, 6a is soldered to the pedestal arrangement 11, this is screwed to the pedestal arrangement 11.
- the screw head 26b is located in the receiving space 5.
- Part of the resonator inner conductor arrangement 6, 6a rests on the pedestal arrangement 11 and, together with the pedestal arrangement 11, is penetrated by the fastening opening 28.
- the fastening opening 28 comprises a thread so that the screw body 26a can be screwed to it.
- the resonator inner conductor arrangement 6, 6a again comprises a segment 38 which is bent in the direction of the end wall 4a with respect to the individual resonator inner conductors 7a to 7n.
- the part of the resonator inner conductor arrangement 6, 6a which rests on the pedestal arrangement 11 therefore runs parallel or with one component predominantly parallel to the individual resonator inner conductors 7a to 7n, but is arranged closer to the end wall 4a than the individual resonator inner conductors 7a to 7n.
- This part is preferably the common connecting web 10. However, it can also be the second end 9 of the individual resonator inner conductors 7a to 7n.
- the screw 26 can be an electrically conductive screw or a screw 26 made of a dielectric material.
- Figure 8M explains how the coupling between the resonator inner conductor arrangement 6, 6a and the housing 2 can be reinforced.
- a dielectric material 39 which is preferably U-shaped in cross-section and thus the second end 9 of the at least one resonator inner conductor, is applied to the second end 9 of at least one or all of the resonator inner conductors 7a to 7n 7a to 7n covered on both sides.
- a fastening mechanism in particular in the form of a latching connection, would also be conceivable.
- the second end 9 could also be completely enclosed with a dielectric material.
- a pedestal arrangement 11 extends in the direction of the resonator inner conductor arrangement 6, 6a, in particular in the direction of the second end 9 of at least one or all of the resonator inner conductors 7a to 7n, but ends with the formation of a space therefrom.
- FIG 8O shows a cross section through the coaxial filter 1, as shown in the exploded view Figure 6 is shown.
- a trough-shaped housing element 2a is closed with the cover arrangement 2c.
- a platform arrangement 11 protrudes into the receiving space 5 thus formed.
- the pedestal arrangement 11 is partially penetrated by the fastening opening 28, which comprises a thread.
- the resonator inner conductor arrangement 6, 6a which rests on the pedestal arrangement 11, is firmly screwed to the latter and thereby clamped.
- the end wall 4a serves to close off a further trough-shaped housing element 2b.
- there is a pedestal arrangement 11 which is only partially penetrated by the fastening opening 28 and which contains a thread.
- the screw 26 also serves to screw the further resonator inner conductor arrangement 6, 6b to the pedestal arrangement 11.
- FIG 8P a coupling opening 15 is shown, which is made in the end wall 4a of the trough-shaped housing element 2a and allows coupling between the resonator inner conductor arrangement 6, 6a to the further resonator inner conductor arrangement 6, 6b.
- a plurality of coupling openings 15 can also be used, which can have any dimensions and shapes (e.g. square, rectangular, slot-shaped, round, oval).
- the Figures 8Q , 8R and 8S explain the use of at least two resonator inner conductor arrangements 6, 6a, 6b in a common receiving space 5 using two trough-shaped housing elements 2a, 2b, the end walls 4a, 4b of which together with the respective side walls 3a 1 to 3a 4 and 3b 1 to 3b 4 form the housing 2 of the coaxial filter 1.
- the thereby delimited common receiving space 5 are in accordance with Figure 8Q two separate resonator inner conductor arrangements 6, 6a, 6b arranged.
- two platform arrangements 11 are formed which protrude from the respective end walls 4a, 4b into the receiving space 5.
- pedestal arrangements 11 are only partially from the fastening opening 28 and have a thread, the resonator inner conductor arrangements 6, 6a, 6b being screwed and / or clamped to the respective pedestal arrangement 11 via a screw. Soldering would also be possible, with the two trough-shaped housing elements 2a, 2b themselves still being connected to one another via a screw or soldered connection (not shown).
- FIG 8R there is a one-piece resonator inner conductor arrangement 6, 6a, 6b.
- the separate resonator inner conductor arrangements 6, 6a, 6b shown are additionally connected to one another via a curved connecting section 40 and are formed in one piece.
- the resonator inner conductor arrangements 6, 6a, 6b are soldered (in particular without a thread) to the pedestal arrangement 11, which has an outwardly continuous fastening opening 28.
- the resonator inner conductor arrangement 6, 6a, 6b with a U-shaped cross-section can be resilient, so that the individual resonator inner conductors 7a to 7n of the individual resonator inner conductor arrangements 6, 6a, 6b want to move away from one another, whereby the resonator inner conductor arrangement 6, 6a, 6b rests well on the pedestal arrangements 11.
- FIG. 13 shows a further embodiment which is similar to that of FIG Figure 8Q Has. At least one, preferably the two platform arrangements 11 that converge are completely penetrated by the fastening opening 28. Between the two separate resonator inner conductor arrangements 6, 6a, 6b there is a spacer 30 which supports the two resonator inner conductor arrangements 6, 6a, 6b from one another. A screw connection penetrates at least one pedestal arrangement 11 and the spacer 30, as well as the two resonator inner conductor arrangements 6, 6a, 6b completely and preferably ends in the further pedestal arrangement 11 the respective pedestal arrangement 11 are screwed or clamped.
- a separating element can also be used between the two resonator inner conductor arrangements 6, 6a, 6b in order to reduce the coupling. It is also possible to screw tuning elements in the form of tuning screws from outside the housing 2 to different distances into the receiving space 5 in order to be able to tune the coaxial filter 1.
- partitions can also be used, which are preferably galvanically connected to the housing 2. Such a partition is pushed between the space between two adjacent resonator inner conductors 7a to 7n in order to at least partially reduce the direct coupling. They can also be formed only on the side walls 3a 1 to 3a 4 or 3b 1 to 3b 4 and / or on the end walls 4a, 4b in order to reduce the volume slightly. It is still the case that two adjacent resonator inner conductors 7a to 7n are in visual contact with one another over their entire length or over their predominant length.
- the coaxial filter 1 according to the invention can have any dimensions that differ depending on the frequency range used.
- the application frequency ranges for such a coaxial filter 1 are typically between 500 MHz and 4500 MHz. A use above or below is also conceivable.
- the housing 2 of the coaxial filter 1 can have side lengths which are greater than 20mm, 50mm, 75mm, 100mm, 150mm, 200mm, 250 or 300 mm and which are preferably smaller than 400mm, 375mm, 325mm, 275mm, 225mm, 175mm, 125mm, 90mm, 70mm or 40mm. These side lengths apply in particular in the X or Y direction, that is to say along the respective side walls 3a 1 , 3a 2 , 3a 3 , 3a 4 or 3b 1 , 3b 2 , 3b 3 , 3b 4 .
- the housing 2 of the coaxial filter 1 can have a thickness which is preferably greater than 3mm, 5mm, 7mm, 9mm, 11mm, 13mm or 15mm and which is more preferably less than 30mm, 25mm, 20mm, 17mm, 13mm, 12mm, 10mm, 6mm or 4mm. Usually it is between 7mm and 10mm.
- the wall thickness of metal sheets (eg the resonator inner conductor 7a, ..., 7n) and / or of the housing elements 2a, 2b and / or of the cover arrangement 2c and / or of the end walls 4a, 4b is preferably greater than 0.5mm , 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm and more preferably smaller than 7mm, 6mm, 4.8mm, 3.8mm, 2.8mm, 1.8mm or 0.8mm. Usually it is in a range between 1mm and 2mm.
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Description
Die Erfindung betrifft ein Koaxialfilter, welches mit sehr wenigen unterschiedlichen Teilen aufgebaut ist, um die Fertigung zu erleichtern.The invention relates to a coaxial filter which is constructed with very few different parts in order to facilitate manufacture.
Filter werden in der Nachrichtentechnik und in der Hochfrequenztechnik immer dann verwendet, wenn nur bestimmte Frequenzanteile eines Signals weiterverarbeitet werden sollen. Neben Hochpass- bzw. Tiefpassfiltern gibt es auch Bandpass- oder Bandsperrfilter. Filter können sowohl digital realisiert als auch mittels diskreten Bauelementen aufgebaut werden. Die Filter können dabei auf einer Leiterplatte aufgebaut werden oder als Koaxialfilter in Form von gefrästen bzw. gegossenen Hohlraumstrukturen ausgebildet sein. Filter in koaxialer Bauweise werden meistens in einem Druckgussverfahren hergestellt, wobei die Feinabstimmung mittels zusätzlich eindrehbarer Abstimmelemente erfolgen kann.Filters are always used in communications engineering and high frequency technology when only certain frequency components of a signal are to be further processed. In addition to high-pass and low-pass filters, there are also band-pass or band-stop filters. Filters can be implemented digitally or constructed using discrete components. The filters can be built on a printed circuit board or designed as coaxial filters in the form of milled or cast cavity structures. Filters with a coaxial design are mostly produced in a die-casting process, with fine-tuning being possible using additional screw-in tuning elements.
Die
Aus der
Die
Aus der
Die
Die
Ein derartiges Filter ist beispielswiese aus der
Ein anderes Hochfrequenzfilter ist aus der
Nachteilig an der
Es ist daher die Aufgabe der vorliegenden Erfindung, ein Koaxialfilter zu schaffen, dessen Verhältnis von elektrischen Eigenschaften zu Bauvolumen verbessert ist. Dieses Filter soll auch möglichst einfach und kostengünstig aufgebaut werden können.It is therefore the object of the present invention to create a coaxial filter whose ratio of electrical properties to structural volume is improved. This filter should also be able to be constructed as simply and inexpensively as possible.
Die Aufgabe wird gemäß dem unabhängigen Anspruch 1 gelöst. In den abhängigen Ansprüchen sind vorteilhafterweise Weiterbildungen enthalten.The object is achieved according to
Das erfindungsgemäße Koaxialfilter umfasst ein Gehäuse, welches einen gemeinsamen Aufnahmeraum umgrenzt. Das Gehäuse umfasst ein elektrisch leitfähiges Material und weist weiterhin ein wannenförmiges Gehäuseelement auf, welches Seitenwände und eine Stirnwand umfasst. Die Stirnwand schließt dabei einen Raum zwischen den Seitenwänden auf einer Seite nach außen hin ab. Die Seitenwände sind dabei einteilig mit der Stirnwand ausgebildet. Das Gehäuse umfasst außerdem ein weiteres wannenförmiges Gehäuseelement, welches Seitenwände umfasst, wobei ein weiterer Raum zwischen diesen Seitenwänden auf deren einen Seite durch eine weitere Stirnwand abgeschlossen ist. Die Seitenwände sind wiederum einteilig mit der Stirnwand ausgebildet. Beide wannenförmigen Gehäuseelemente sind aufeinander gesetzt, so dass die Seitenwände beider wannenförmiger Gehäuseelemente zwischen den beiden Stirnwänden verlaufen und gemeinsam den Aufnahmeraum umgrenzen bzw. definieren, der durch die beiden Räume gebildet ist. Das Gehäuse kann alternativ auch anstelle eines weiteren wannenförmigen Gehäuseelements eine Deckelanordnung umfassen, wobei die Seitenwände des wannenförmigen Gehäuseelements zwischen der Stirnwand und der Deckelanordnung verlaufen und dadurch den Aufnahmeraum umgrenzen, der durch den Raum gebildet ist. In diesem Fall verschließt die Deckelanordnung den Aufnahmeraum. Das Gehäuse ist dabei vorzugsweise HF-dicht ausgebildet. Es ist weiterhin zumindest eine einteilig ausgebildete Resonator-Innenleiteranordnung vorgesehen, die in dem Aufnahmeraum angeordnet ist und die vorzugsweise aus einem gestanzten und/oder gelaserten Metallblech besteht. Die zumindest eine Resonator-Innenleiteranordnung umfasst mehrere Resonator-Innenleiter, von denen zumindest zwei oder alle in derselben Ebene liegen und ein erstes Ende und ein vom ersten Ende beabstandetes zweites Ende aufweisen. Die Resonator-Innenleiter sind dabei parallel oder mit einer Komponente überwiegend parallel zur Stirnwand bzw. zur Deckelanordnung ausgerichtet. Die Resonator-Innenleiteranordnung umfasst außerdem noch einen Verbindungssteg, an dem die einzelnen Resonator-Innenleiter mit ihrem ersten Ende elektrisch leitend verbunden sind und beabstandet voneinander von diesem weg verlaufen. Vorzugsweise besteht die Resonator-Innenleiteranordnung ausschließlich aus den mehreren Resonator-Innenleitern und dem Verbindungssteg. Zumindest zwei unmittelbar benachbarte Resonator-Innenleiter, die sich vom gemeinsamen Verbindungssteg in dieselbe Richtung weg erstrecken, stehen über ihre gesamte Länge oder über ihre überwiegende Länge in Sichtverbindung zueinander, wodurch eine direkte Kopplung ermöglicht ist. Dies bedeutet, dass das Gehäuse nicht an die Kontur der Resonator-Innenleiteranordnung angepasst ist und in den Abstandsraum zwischen zwei benachbarten Resonator-Innenleitern hinein verläuft. Unter dem Wortlaut "gesamte Länge" ist dabei die Länge vom ersten bis zum zweiten Ende zu verstehen. Damit kann dann das Gehäuse eine sehr einfache Geometrie aufweisen und ist somit einfach und kostengünstig herzustellen. Es ist weiterhin zumindest eine Podestanordnung vorgesehen, wobei sich die zumindest eine Podestanordnung in Richtung der zumindest einen Resonator-Innenleiteranordnung erstreckt und beabstandet zu dieser endet. Die zumindest eine Podestanordnung ist einteilig:
- a) an der Stirnwand eines wannenförmigen Gehäuseelements ausgebildet, wenn das Gehäuse ein weiteres wannenförmiges Gehäuseelement umfasst; oder
- b) an der Deckelanordnung ausgebildet, wenn das Gehäuse eine Deckelanordnung umfasst.
- a) formed on the end wall of a trough-shaped housing element if the housing comprises a further trough-shaped housing element; or
- b) formed on the cover assembly when the housing comprises a cover assembly.
Die Seitenwände und die Stirnwand des Gehäuseelements bestehen aus einem Guß- und/oder Fließpress- und/oder Frästeil oder umfassen ein solches. Die Resonator-Innenleiter der zumindest einen Resonator-Innenleiteranordnung erstrecken sich auf beiden Seiten von dem Verbindungsteg weg. Der Verbindungssteg ist in unterschiedliche Verbindungsstegabschnitte gegliedert, wobei die Verbindungsstegabschnitte versetzt zueinander verlaufen. Die Resonator-Innenleiteranordnung ist mit dem Gehäuse verschraubt und/oder verklemmt.The side walls and the end wall of the housing element consist of a cast and / or extrusion and / or milled part or include such a part. The resonator inner conductor of the at least one resonator inner conductor arrangement extend away from the connecting web on both sides. The connecting web is divided into different connecting web sections, the connecting web sections running offset to one another. The resonator inner conductor arrangement is screwed and / or clamped to the housing.
Es ist besonders vorteilhaft, dass das Gehäuse günstiger herstellbar ist als bei demjenigen aus dem Stand der Technik. Der Einsatz zumindest eines wannenförmigen Gehäuseelements ist dahingehend vorteilhaft, weil dieses bereits im Vorfeld, also vor der Endmontage, gefertigt werden kann und weil die Toleranzen bezüglich den jeweiligen Seitenwänden zusammen mit der Stirnwand um ein Vielfaches geringer sind als die Toleranzen bei dem Gehäuse aus dem Stand der Technik. Bei diesem werden durch Einsatz von zwei getrennten Seitenrahmen und zwei getrennten Deckelanordnungen zusammen mit einer Klebeverbindung nur unzureichende Herstellungstoleranzen realisiert werden können. Mit der erfindungsgemäßen Lösung wird außerdem die Anzahl der Füge- bzw. Kontakt- bzw. Übergangsstellen zwischen verschiedenen Gehäuseelementen und der Resonator-Innenleiteranordnung reduziert, welche die elektrischen Eigenschaften negativ beeinflussen können (geringere Verluste bzw. Intermodulation). Die Anzahl möglicher Stör- oder Fehlstellen wird daher reduziert. Der Einsatz eines weiteren wannenförmigen Gehäuseelements erlaubt einen symmetrischen Aufbau, wobei lediglich nur eine entsprechende Form benötigt wird, wenn das wannenförmige Gehäuseelement beispielsweise in einem (Druck-) Gussverfahren hergestellt wird. Auch der Einsatz mit einer Deckelanordnung ist vorteilhaft, weil dadurch ein sehr flaches Gehäuse realisiert werden kann. Der Einsatz der Resonator-Innenleiteranordnung erleichtert ebenfalls die Herstellung, weil alle Resonator-Innenleiter an dem gemeinsamen Verbindungssteg angeordnet sind und die gesamte Resonator-Innenleiteranordnung einteilig hergestellt ist. Die Resonator-Innenleiter-anordnung kann in einem separaten Prozess hergestellt und entsprechend im Vorfeld auf ihre genauen Abmessungen hin vermessen werden. Aufgrund des flachen Aufbaus der Resonator-Innenleiteranordnung eignet sich diese optimal für den Einsatz in dem eingangs beschriebenen Gehäuse. Besonders vorteilhaft ist dabei, dass das Koaxialfilter lediglich aus drei Teilen aufgebaut ist, wodurch eine sehr geringe Bauhöhe erreicht wird. Das Koaxialfilter kann dabei in einem Gießverfahren, insbesondere in einem (Aluminium-, bzw. Zink-) Druckgussverfahren hergestellt werden. Die Herstellung kann auch in einem Fräsprozess oder in einem Fließpressverfahren erfolgen. Ein solches Koaxialfilter kann insbesondere für Leistungen von 5 bis 20 Watt eingesetzt werden. Die Leistung kann auch niedriger oder höher sein. Das Gehäuse und/oder die Resonator-Innenleiteranordnung könnte auch aus Kunststoff gefertigt werden, wobei dieser dann mit einer elektrisch leitfähigen Schicht versehen werden müsste.It is particularly advantageous that the housing can be manufactured more cheaply than that of the prior art. The use of at least one trough-shaped housing element is advantageous because it can be manufactured in advance, i.e. before final assembly, and because the tolerances with regard to the respective side walls together with the end wall are many times lower than the tolerances for the housing from the state of the technique. In this case, only inadequate manufacturing tolerances can be achieved by using two separate side frames and two separate cover arrangements together with an adhesive connection. The solution according to the invention also reduces the number of joining or contact or transition points between different housing elements and the resonator inner conductor arrangement, which can negatively affect the electrical properties (lower losses or intermodulation). The number of possible faults or defects is therefore reduced. The use of a further trough-shaped housing element allows a symmetrical structure, only a corresponding shape being required if the trough-shaped housing element is produced, for example, in a (pressure) casting process. Use with a cover arrangement is also advantageous because it enables a very flat housing to be realized. The use of the resonator inner conductor arrangement also facilitates production because all the resonator inner conductors are arranged on the common connecting web and the entire resonator inner conductor arrangement is manufactured in one piece. The resonator inner conductor arrangement can be produced in a separate process and measured in advance for its exact dimensions. Due to the flat structure of the resonator inner conductor arrangement, it is ideally suited for use in the housing described above. Particularly beneficial is that the coaxial filter is made up of only three parts, which means that the overall height is very low. The coaxial filter can be produced in a casting process, in particular in an (aluminum or zinc) die-casting process. The production can also take place in a milling process or in an extrusion process. Such a coaxial filter can be used in particular for outputs of 5 to 20 watts. The performance can also be lower or higher. The housing and / or the resonator inner conductor arrangement could also be made of plastic, which would then have to be provided with an electrically conductive layer.
Die zumindest eine Resonator-Innenleiteranordnung besteht vorzugsweise aus einem Blech, welches gestanzt, gelasert, gefräst, gebohrt und/oder gedruckt sein kann. Die zumindest eine Resonator-Innenleiteranordnung kann einerseits von dem Gehäuse galvanisch getrennt oder mit diesem galvanisch verbunden sein. Vorzugsweise ist das zweite Ende der Resonator-Innenleiter von dem Gehäuse beabstandet gehalten, wobei die Resonator-Innenleiteranordnung, insbesondere die einzelnen Resonator-Innenleiter, mittig durch den Aufnahmeraum verlaufen und gleichweit von den Stirnseiten bzw. der Deckelanordnung beabstandet ist. Die Resonator-Innenleiteranordnung ist dabei mit dem Gehäuse insbesondere verlötet und/oder verschraubt und/oder verklemmt, nicht jedoch verklebt (klebefrei). Ein außermittiger Verlauf wäre ebenfalls möglich.The at least one resonator inner conductor arrangement preferably consists of a sheet metal which can be punched, lasered, milled, drilled and / or printed. The at least one resonator inner conductor arrangement can on the one hand be galvanically separated from the housing or galvanically connected to it. The second end of the resonator inner conductor is preferably kept at a distance from the housing, the resonator inner conductor arrangement, in particular the individual resonator inner conductor, running centrally through the receiving space and being equidistant from the end faces or the cover arrangement. The resonator inner conductor arrangement is in particular soldered and / or screwed and / or clamped to the housing, but not glued (non-adhesive). An eccentric course would also be possible.
Die Resonator-Innenleiteranordnung kann für eine Tiefpass- oder Bandpass- oder Bandsperr- oder Hochpasscharakteristik sorgen. Es kann sich auch um ein zusammengeschaltetes Filter handeln, mit welchem mehrere Frequenzbereiche bedient werden können. Das Koaxialfilter kann als Diplexer bzw. Multiplexer bzw. Duplexer eingesetzt werden.The resonator inner conductor arrangement can provide a low-pass or band-pass or band-stop or high-pass characteristic. It can also be an interconnected filter with which several frequency ranges can be served. The coaxial filter can be used as a diplexer or multiplexer or duplexer.
Die Resonator-Innenleiteranordnung weist vorzugsweise eine homogene Dicke auf. Diese ist vorzugsweise größer als 0,2 mm, 0,4 mm, 0,5 mm, 0,7 mm, 0,9 mm, 1 mm, 1,5 mm, 2 mm, 2,5 mm, 3 mm aber weitervorzugsweise kleiner als 5 mm, 4 mm, 3 mm, 2 mm, 1 mm, 0,8 mm, 0,6 mm. Die Fläche der Ober- bzw. Unterseite der Resonator-Innenleiteranordnung ist um ein Vielfaches (mehr als das 3-, 5-, 7-, 9-, 11-, 13-, 15-, 17-, 19-Fache) größer als die Seitenfläche der Resonator-Innenleiteranordnung.The resonator inner conductor arrangement preferably has a homogeneous thickness. This is preferably greater than 0.2 mm, 0.4 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, but more preferably smaller than 5mm, 4mm, 3mm, 2mm, 1mm, 0.8mm, 0.6mm. The area of the top or bottom of the resonator inner conductor arrangement is many times (more than 3, 5, 7, 9, 11, 13, 15, 17, 19 times) larger than the side surface of the resonator inner conductor arrangement.
In einer weiteren vorteilhaften Ausführungsform umfasst das Koaxialfilter einen leitfähigen Trennsteg, der an jeweils einer Seitenwand beider aufeinandergesetzten wannenförmigen Gehäuseelemente, wenn das Gehäuse ein weiteres wannenförmiges Gehäuseelement umfasst, oder an dem einen wannenförmigen Gehäuseelement entspringt, wenn das Gehäuse eine Deckelanordnung umfasst und in Richtung der gegenüberliegenden Seitenwand verläuft. Dadurch wird der Aufnahmeraum in zwei Aufnahmekammern gegliedert, die über eine Öffnung miteinander verbunden sind. Der gemeinsame Verbindungssteg der Resonator-Innenleiteranordnung liegt vorzugsweise auf dem Trennsteg auf, so dass die einzelnen Resonator-Innenleiter in unterschiedliche Aufnahmekammern ragen. Dadurch kann auf sehr vorteilhafte Weise ein Duplexer mit Filterpfaden geschaffen werden, die überwiegend voneinander entkoppelt sind.In a further advantageous embodiment, the coaxial filter comprises a conductive separating web, which arises on one side wall of both trough-shaped housing elements placed on top of one another if the housing comprises a further trough-shaped housing element, or on the one trough-shaped housing element if the housing comprises a cover arrangement and in the direction of the opposite one Sidewall runs. As a result, the receiving space is divided into two receiving chambers which are connected to one another via an opening. The common connecting web of the resonator inner conductor arrangement preferably rests on the separating web, so that the individual resonator inner conductors protrude into different receiving chambers. As a result, a duplexer with filter paths which are predominantly decoupled from one another can be created in a very advantageous manner.
Ein weiteres erfindungsgemäßes Ausführungsbeispiel sieht vor, dass eine zusätzliche Resonator-Innenleiteranordnung ausgebildet ist, wobei die eine Resonator-Innenleiteranordnung an der Stirnwand des wannenförmigen Gehäuseelements befestigt ist und die weitere Resonator-Innenleiteranordnung an der Stirnwand des weiteren wannenförmigen Gehäuseelements befestigt ist (z.B. direkt oder über Podestanordnungen bzw. Abstandshalter). Es könnte auch ein zusätzliches wannenförmiges Gehäuseelement vorgesehen sein, wobei auf die Stirnflächen von dessen Seitenwänden die Stirnwand des wannenförmigen Gehäuseelements aufgesetzt ist, welches mit einer Deckelanordnung verschlossen ist, wodurch ein weiterer Aufnahmeraum gebildet ist. In diesem weiteren Aufnahmeraum ist dann die weitere Resonator-Innenleiteranordnung angeordnet. In der Stirnwand des wannenförmigen Gehäuseelements, welches mit der Deckelanordnung verschlossen ist, ist zumindest eine Koppelöffnung eingebracht, so dass eine elektrische Kopplung zwischen den einzelnen Resonator-Innenleiteranordnungen in den unterschiedlichen Aufnahmeräumen möglich ist. Dadurch kann das Koaxialfilter beliebig erweitert werden, um zusätzliche Ein- und Auskoppelvorrichtungen anbringen zu können.Another embodiment according to the invention provides that an additional resonator inner conductor arrangement is formed, wherein the one resonator inner conductor arrangement is fastened to the end wall of the trough-shaped housing element and the further resonator inner conductor arrangement is fastened to the end wall of the further trough-shaped housing element (e.g. directly or via Platform arrangements or spacers). An additional trough-shaped housing element could also be provided, the end wall of the trough-shaped housing element being placed on the end faces of its side walls, which is closed with a cover arrangement, whereby a further receiving space is formed. The further resonator inner conductor arrangement is then arranged in this further receiving space. At least one coupling opening is made in the end wall of the trough-shaped housing element, which is closed with the cover arrangement, so that electrical coupling between the individual resonator inner conductor arrangements in the different receiving spaces is possible. As a result, the coaxial filter can be expanded as required in order to be able to attach additional coupling and decoupling devices.
Verschiedene Ausführungsbeispiele der Erfindung werden nachfolgend unter Bezugnahme auf die Zeichnungen beispielhaft beschrieben. Gleiche Gegenstände weisen dieselben Bezugszeichen auf. Die entsprechenden Figuren der Zeichnungen zeigen im Einzelnen:
- Figur 1:
- eine vereinfachte Darstellung des erfindungsgemäßen Koaxialfilter, welches ein wannenförmiges Gehäuseelement zeigt, in dem eine Resonator-Innenleiteranordnung angeordnet ist;
- Figur 2:
- eine weitere vereinfachte Darstellung des erfindungsgemäßen Koaxialfilter, welches eine andere Ausgestaltung der Resonator-Innenleiteranordnung zeigt, und bei welchem drei Ein- und/oder Auskoppelvorrichtungen bzw. Ein- und/oder Auskoppelanschlüsse sichtbar sind;
- Figuren 3A bis 3D:
- verschiedene Ausführungsformen einer Podestanordnung auf der die Resonator-Innenleiteranordnung aufliegt;
- Figuren 4A bis 4J:
- verschiedene Ausführungsformen der Resonator-Innenleiteranordnung;
- Figuren 5A, 5B:
- zwei verschiedene Ausführungsbeispiele des Gehäuses des erfindungsgemäßen Koaxialfilters;
- Figur 6:
- den Einsatz mehrerer übereinander angeordneter Resonator-Innenleiteranordnungen;
- Figuren 7A, 7B:
- den Einsatz eines Trennstegs, der den Aufnahmeraum in zwei Aufnahmekammern teilt;
- Figuren 8A bis 8L:
- verschiedene Befestigungsmöglichkeiten für die Resonator-Innenleiteranordnung ;
- Figuren 8M, 8N:
- verschiedene Möglichkeiten, um die kapazitive Kopplung zwischen dem Gehäuse und der Resonator-Innenleiteranordnung zu erhöhen; und
- Figuren 8O bis 8S:
- verschiedene Möglichkeiten wie zwei Resonator-Innenleiteranordnungen übereinander angeordnet und ausgerichtet sein können.
- Figure 1:
- a simplified representation of the coaxial filter according to the invention, which shows a trough-shaped housing element in which a resonator inner conductor arrangement is arranged;
- Figure 2:
- a further simplified representation of the coaxial filter according to the invention, which shows a different embodiment of the resonator inner conductor arrangement, and in which three coupling and / or decoupling devices or input and / or decoupling connections are visible;
- Figures 3A to 3D:
- various embodiments of a pedestal arrangement on which the resonator inner conductor arrangement rests;
- Figures 4A to 4J:
- various embodiments of the resonator inner conductor arrangement;
- Figures 5A, 5B:
- two different embodiments of the housing of the coaxial filter according to the invention;
- Figure 6:
- the use of several superimposed resonator inner conductor arrangements;
- Figures 7A, 7B:
- the use of a divider that divides the receiving space into two receiving chambers;
- Figures 8A to 8L:
- various mounting options for the resonator inner conductor arrangement;
- Figures 8M, 8N:
- various ways to increase the capacitive coupling between the housing and the resonator inner conductor arrangement; and
- Figures 8O to 8S:
- different possibilities of how two resonator inner conductor arrangements can be arranged and aligned one above the other.
Das wannenförmige Gehäuseelement 2a weist in diesem Fall einen rechteckigen Grundriss, insbesondere Längsschnitt auf. Die Seitenwände 3a1 bis 3a4 verlaufen vorzugsweise senkrecht zur Stirnwand 4a. Sie könnten allerdings auch schräg zur Stirnwand 4a verlaufen. Die einzelnen Seitenwände 4a1 bis 4a4 verlaufen in dem gezeigten Ausführungsbeispiel unter einem rechten Winkel zueinander. Die so gebildeten Ecken könnten allerdings auch abgerundet sein. Andere Grundformen sind ebenfalls denkbar. So kann das Koaxialfilter 1 in Draufsicht auf einen Längsschnitt auch quadratisch, oval oder kreisförmig gestaltet sein. Die einzelnen Seitenwände 4a1 bis 4a4 können auch einen stufenförmigen Verlauf aufweisen, wie dies in
In
Die beiden wannenförmigen Gehäuseelemente 2a, 2b sind dabei mit ihrer offenen Seite zueinander aufeinander gesetzt. Vorzugsweise berühren sich dabei die Stirnseiten der Seitenwände 3a1 bis 3a4 und 3bi bis 3b4 beider wannenförmiger Gehäuseelemente 2a, 2b. Die Seitenwände 3a1 bis 3a4 und 3bi bis 3b4 beider wannenförmiger Gehäuseelemente 2a, 2b verlaufen dabei zwischen den jeweiligen Stirnwänden 4a, 4b, wodurch der Aufnahmeraum 5 begrenzt ist, der durch die beiden Räume 5a, 5b gebildet ist. Ein solch zusammengesetztes Gehäuse 2 kann beispielsweise der
Anstelle eines weiteren wannenförmigen Gehäuseelements 2b kann das eine wannenförmige Gehäuseelement 2a auch mit einer Deckelanordnung 2c verschlossen sein, wobei die Seitenwände 3a1 bis 3a4 zwischen der Stirnwand 4a und der Deckelanordnung 2c verlaufen und den Aufnahmeraum 5, der durch den Raum 5a gebildet ist, begrenzen. Ein solcher Aufbau des Gehäuses 2 ist beispielsweise in
In
Die zumindest eine Resonator-Innenleiteranordnung 6, 6a umfasst außerdem noch einen (gemeinsamen) Verbindungssteg 10, an dem die Resonator-Innenleiter 7a bis 7n mit ihrem ersten Ende 8 elektrisch leitend verbunden sind. Die einzelnen Resonator-Innenleiter 7a bis 7n verlaufen parallel zueinander und parallel zu zumindest einer Seitenwand 3a2 bzw. 3a4.The at least one resonator inner conductor arrangement 6, 6a also comprises a (common) connecting
Die Resonator-Innenleiteranordnung 6, 6a ist insbesondere frei von einem umgebenden Rahmen, in dem die mehreren Resonator-Innenleiter 7a, 7b, ... 7n und der Verbindungssteg 10 angeordnet sind und der einteilig an dem Verbindungssteg 10 ausgebildet ist.The resonator inner conductor arrangement 6, 6a is in particular free of a surrounding frame in which the multiple resonator
Der Verbindungssteg 10 der Resonator-Innenleiteranordnung 6, 6a verläuft über mehr als 60%, 70%, 80%, 90% oder 95% der Länge einer Seitenwand 3a1, 3a2, 3a3 und 3a4, die auch eine Außenwand bildet, entlang und parallel zu dieser. Insbesondere erstreckt sich der Aufnahmeraum 5 über die gesamte Länge und/oder Breite des Koaxialfilters 1 (abzüglich der Dicke der jeweiligen Seitenwand 3a1, 3a2, 3a3 und 3a4).The connecting
Die einzelnen Resonator-Innenleiter 7a bis 7n sind durch einen vorbestimmten Abstand voneinander beabstandet. Zumindest zwei benachbarte Resonator-Innenleiter 7a bis 7n, die sich vom Verbindungssteg 10 in dieselbe Richtung weg erstrecken, stehen über ihre gesamte Länge oder über ihre überwiegende Länge (mehr als 50 %, 60 %, 70 % oder 80 %) in Sichtverbindung zueinander. Dies bedeutet, dass das Gehäuse 2 gerade eben nicht in den Abstandsraum zwischen zwei benachbarten Resonator-Innenleitern 7a bis 7n eintaucht, wodurch die Kopplung zwischen zwei benachbarten Resonator-Innenleitern 7a bis 7n stark reduziert wäre.The individual resonator
Alle Resonator-Innenleiter 7a bis 7n erstrecken sich in
Der Verbindungssteg weist eine Länge auf, die vorzugsweise mehr als 50 %, 60 %, 70 %, 80 % oder 90 % der Länge der Seitenwand 3a1 bzw. 3a3 entspricht, zu welcher er parallel verläuft. Der Verbindungssteg 10 ist allerdings vorzugsweise kürzer als die entsprechende Seitenwand 3a1 bzw. 3a3 zu welcher er parallel verläuft.The connecting web has a length which preferably corresponds to more than 50%, 60%, 70%, 80% or 90% of the length of the side wall 3a 1 or 3a 3 , to which it runs parallel. The connecting
Die Breite des Verbindungsstegs 10 ist vorzugsweise größer als die Breite zumindest eines oder aller der Resonator-Innenleiter 7a bis 7n. Sie könnte allerdings auch gleich oder kleiner sein.The width of the connecting
In
Die Resonator-Innenleiteranordnung 6, 6a besteht aus einem gestanzten und/oder gelaserten und/oder gebogenen und/oder gefrästen und/oder gedruckten Metallblech. Ein Trägermaterial für die eigentliche Filterstruktur, wie dieses bei Microstreifen-Strukturen eingesetzt wird, wird nicht benötigt. Dies bedeutet, dass die Resonator-Innenleiteranordnung 6, 6a trägermaterialfrei ist. Durch einen Verzicht auf ein Trägermaterial reduzieren sich auch die elektrischen Verluste, wodurch das Filter verbessert wird. Insbesondere ist die Resonator-Innenleiteranordnung 6, 6a leiterplattenfrei.The resonator inner conductor arrangement 6, 6a consists of a stamped and / or lasered and / or bent and / or milled and / or printed sheet metal. A carrier material for the actual filter structure, as used in microstrip structures, is not required. This means that the resonator inner conductor arrangement 6, 6a is free of carrier material. Dispensing with a carrier material also reduces electrical losses, which improves the filter. In particular, the resonator inner conductor arrangement 6, 6a is free of circuit boards.
Die Resonator-Innenleiteranordnung 6, 6a besteht vorzugsweise aus einem anderen Material als das Gehäuse 2. Sie könnte auch aus demselben Material wie z.B. Aluminium bestehen. Allerdings bestehen die Resonator-Innenleiteranordnung 6, 6a und das Gehäuse 2 nicht aus ein und demselben Teil bzw. Werkstück. Sie bestehen daher aus unterschiedlichen Werkstücken. Diese sind nicht einteilig aneinander ausgebildet. Diese werden in getrennten Prozessen hergestellt. Die Resonator-Innenleiteranordnung 6, 6a und das wannenförmige Gehäuseelement 2a bzw. 2b bzw. die Deckelanordnung 2c sind nicht aus einem gemeinsamen Werkstück oder Teil hergestellt. Dies bedeutet, dass die Resonator-Innenleiteranordnung 6, 6a separat gefertigt und in den Aufnahmeraum 5 des Gehäuses 2 eingesetzt wird. Das Einsetzen der Resonator-Innenleiteranordnung 6, 6a in das eine wannenförmige Gehäuseelement 2a ist dabei nur über eine Öffnung möglich, die durch das weitere wannenförmige Gehäuseelements 2b oder die Deckelanordnung 2c verschlossen ist. Alle anderen Öffnungen zum Einsetzen sind dabei durch die Seitenwände 3a1, 3a2, 3a3 und 3a4 und die Stirnwand 4a verschlossen.The resonator inner conductor arrangement 6, 6a is preferably made of a different material than the housing 2. It could also be made of the same material such as aluminum. However, the resonator inner conductor arrangement 6, 6a and the housing 2 do not consist of one and the same part or workpiece. They therefore consist of different workpieces. These are not formed in one piece with one another. These are produced in separate processes. The resonator inner conductor arrangement 6, 6a and the trough-shaped housing element 2a or 2b or the cover arrangement 2c are not produced from a common workpiece or part. This means that the resonator inner conductor arrangement 6, 6a is manufactured separately and inserted into the receiving space 5 of the housing 2. The insertion of the resonator inner conductor arrangement 6, 6a into the one trough-shaped housing element 2a is only possible via an opening which is closed by the further trough-shaped housing element 2b or the cover arrangement 2c. All other openings for insertion are closed by the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 and the
Die Resonator-Innenleiteranordnung 6, 6a ist beabstandet von den Stirnseiten 4a, 4b bzw. der Deckelanordnung 2c gehalten. Insbesondere sind die Resonator-Innenleiter 7a bis 7n von dem Gehäuse 2, insbesondere von den Stirnwänden 4a, 4b bzw. der Deckelanordnung 2c beabstandet gehalten.The resonator inner conductor arrangement 6, 6a is held at a distance from the end faces 4a, 4b and the cover arrangement 2c. In particular, the resonator
Die Resonator-Innenleiteranordnung 6, 6a ist in dem Aufnahmeraum 5 angeordnet, der direkt durch die Seitenwände 3a1, 3a2, 3a3 und 3a4 bzw. 3bi, 3b2, 3b3 und 3b4 umgrenzt ist. Der Aufnahmeraum 5 umfasst stets Begrenzungswände, bei welchen es sich um die Seitenwände 3a1, 3a2, 3a3 und 3a4 bzw. 3bi, 3b2, 3b3 und 3b4 handelt, die auch die Außenwände des Gehäuses 2 darstellen.The resonator inner conductor arrangement 6, 6a is arranged in the receiving space 5 which is delimited directly by the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 or 3bi, 3b 2 , 3b 3 and 3b 4 . The receiving space 5 always includes boundary walls, which are the side walls 3a 1 , 3a 2 , 3a 3 and 3a 4 or 3bi, 3b 2 , 3b 3 and 3b 4 , which also represent the outer walls of the housing 2.
Wie später noch erläutert wird, ist die zumindest eine Resonator-Innenleiteranordnung 6, 6a vorzugsweise mit dem Gehäuse 2 verlötet und/oder verschraubt und/oder verklemmt. Vorzugsweise handelt es sich dabei um eine galvanische Verbindung. Dies ist aber nicht zwingend. So kann die Resonator-Innenleiteranordnung 6, 6a dabei auch auf einer Podestanordnung 11 aufliegen. Eine solche Podestanordnung 11 wird in Hinblick auf die
In
In
Die zumindest eine Resonator-Innenleiteranordnung 6, 6a liegt dabei auf der zumindest einen Podestanordnung 11 auf. Vorzugsweise liegt die Resonator-Innenleiteranordnung 6 einzig an ihrem Verbindungssteg 10 auf der Podestanordnung 11 auf. Dieser Sachverhalt ist beispielsweise in
Die Resonator-Innenleiter 7a bis 7n der zumindest einen Resonator-Innenleiteranordnung 6, 6a erstrecken sich in
Die Resonator-Innenleiteranordnung 6, 6a liegt in
Die Resonator-Innenleiter 7a bis 7n, die sich entlang einer Richtung von dem gemeinsamen Verbindungssteg 10 wegerstrecken, sind entlang einer Teillänge des Verbindungsstegs 10 unterschiedlich weit von der Seitenwand 3a1 bzw. 3bi beabstandet, auf die sie zulaufen, wohingegen sie über eine andere Teillänge des Verbindungsstegs 10, von dem sie abstehen, gleich weit von der entsprechenden Seitenwand 3a1 bzw. 3bi beabstandet sind, auf die sie zulaufen. Weiterhin sind diejenigen Resonator-Innenleiter 7a bis 7n, die sich auf einer anderen Seite des gemeinsamen Verbindungsstegs 10 in Richtung der entsprechenden Seitenwand 3a3 bzw. 3b3 weg erstrecken, gleich weit von dieser Seitenwand 3a3 bzw. 3b3 beabstandet.The resonator
In
Zwei dieser Ein- und/oder Auskoppelvorrichtungen 12a, 12b durchsetzen eine Seitenwand 3a1 bis 3a4 bzw. 3b1 bis 3b4, wohingegen die dritte Ein- und/oder Auskoppelvorrichtung 12c eine Stirnwand 4a bzw. 4b oder die Deckelanordnung 2c durchsetzt. Die erste und die zweite Ein- und/oder Auskoppelvorrichtung 12a, 12b sind vorzugsweise mit den Resonator-Innenleitern 7a, 7n gekoppelt, die am Anfang und am Ende des gemeinsamen Verbindungsstegs 10 angeordnet sind. Die dritte Ein- und/oder Auskoppelvorrichtung 12c, die vorzugsweise senkrecht zu den anderen Ein- und/oder Auskoppelvorrichtungen 12a, 12b angeordnet ist, ist mit einem Resonator-Innenleiter gekoppelt, der sich zwischen den äußersten Resonator-Innenleitern 7a, 7n befindet (insbesondere in der Mitte).Two of these coupling and / or
Der Abstand der einzelnen Ein- und/oder Auskoppelvorrichtungen 12a, 12b, 12c zu dem jeweiligen Resonator-Innenleiter beträgt vorzugsweise weniger als 5cm, 4cm, 3cm, 2cm, 1cm, 0,5cm. Das Koaxialfilter 1 arbeitet vorzugsweise als Duplexfilter.The distance between the individual coupling and / or
Die Ein- und/oder Auskoppelvorrichtungen 12a, 12b, 12c können auch als Ein- und/oder Auskoppelanschlüsse 12a, 12b, 12c bezeichnet werden. Vorzugsweise handelt es sich um Buchsen oder Stecker, die insbesondere von außen auf das Gehäuse 2 aufgesetzt und mit diesem verschraubt werden. Zwischen der Ein- und/oder Auskoppelvorrichtungen 12a, 12b, 12c und der zumindest einen Resonator-Innenleiteranordnung 6, 6a ist vorzugsweise keine Leiterplatte angeordnet.The coupling and / or
Im Folgenden wird auf die
Zumindest einer oder alle der Resonator-Innenleiter 7a bis 7n der zumindest einen Resonator-Innenleiteranordnung 6, 6a erstrecken sich schräg von dem gemeinsamen Verbindungssteg 10 weg. Der kleinere Winkel α zwischen den Resonator-Innenleitern 7a bis 7n und dem gemeinsamen Verbindungssteg 10 weist eine Größe von mehr als 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° auf, aber von weniger als 85°, 75°, 65°, 55°, 45°, 35°, 25°, 15°, 5°. Jeder der Resonator-Innenleiter 7a bis 7n kann in einzelne Abschnitte gegliedert sein, die wiederum unter einem Winkel aufeinander zu laufen. In diesem Fall wäre der entsprechende Resonator-Innenleiter geknickt. Alle diese Abschnitte verlaufen allerdings unter einem Winkel kleiner 90° zum Verbindungssteg 10 hin.At least one or all of the resonator
In
Gemäß
Grundsätzlich wäre es auch möglich, dass die abgewinkelten Abschnitte mit dem zweiten Ende 9 der Resonator-Innenleiter 7a bis 7n auch unter einem Winkel von ungleich 90° gegenüber dem restlichen Abschnitt des Resonator-Innenleiters 7a bis 7n verlaufen.In principle, it would also be possible for the angled sections with the
In
In
In
In
Grundsätzlich gilt auch, dass der gemeinsame Verbindungssteg 10 in etwa so breit ist wie der Resonator-Innenleiter 7a bis 7n. Der Wortlaut "in etwa" ist dahingehend zu verstehen, dass eine Abweichung von weniger als 25%, 20%, 15%, 10% oder weniger als 5% miteingeschlossen ist.In principle, it also applies that the common connecting
Der Aufbau der Resonator-Innenleiteranordnung 6, 6a in
Auch eine induktive Überkopplung wäre möglich, wobei diese vorzugsweise durch einen nicht dargestellten Überkopplungsstab gebildet wäre. Dieser wäre dann galvanisch mit zwei nicht benachbarten Resonator-Innenleitern 7a bis 7n verbunden, beispielsweise verlötet. Die Anordnung würde wie bei dem Überkopplungselement 14 erfolgen.An inductive coupling would also be possible, this being preferably formed by a coupling rod (not shown). This would then be galvanically connected to two non-adjacent resonator
Eine induktive Kopplung zwischen zwei benachbarten Resonator-Innenleitern 7a bis 7n könnte auch dadurch erfolgen, dass der Verbindungssteg 10 zwischen diesen beiden Resonator-Innenleitern 7a bis 7n breiter ist als zwischen zwei anderen Resonator-Innenleitern 7a bis 7n.An inductive coupling between two adjacent resonator
Eine Kopplung zwischen zwei benachbarten Resonator-Innenleitern 7a bis 7n besteht generell sowohl über deren Sichtverbindung als auch über den entsprechenden Teil des Verbindungssteges 10. Die Kopplung kann auch beispielsweise dadurch variiert werden, indem die Abstände der benachbarten Resonator-Innenleiter 7a bis 7n verändert werden oder durch Variation der Lage (näher am Fußpunkt oder näher zum offenen Ende hin) oder durch Variation der Form (z.B. dünner oder dicker) des jeweiligen Verbindungsstegabschnitts 10a bis 10n.A coupling between two adjacent resonator
Die
Für den Fall, dass nur ein wannenförmiges Gehäuseelement 2a verwendet wird, welches mit der Deckelanordnung 2c abgeschlossen wird und den Aufnahmeraum 5 umgrenzt, weist dieses einen Trennsteg 20 auf, der von einer Seitenwand 3a1 bis 3a4 in Richtung der gegenüberliegenden Seitenwand 3a1 bis 3a4 verläuft und unter Ausbildung einer Öffnung 21 beabstandet zu dieser endet. Auch hier ist der Trennsteg 20 elektrisch leitfähig, vorzugsweise einteilig mit der Seitenwand 3a1 bis 3a4 verbunden.In the event that only a trough-shaped housing element 2a is used, which is closed with the cover arrangement 2c and the receiving space 5, this has a separating
Der gemeinsame Verbindungssteg 10 liegt dabei vorzugsweise auf dem Trennsteg 20 auf. Die einzelnen Resonator-Innenleiter 7a bis 7n der zumindest einen Resonator-Innenleiteranordnung 10 erstrecken sich dann in die erste und in die zweite Aufnahmekammer 51, 52 des Aufnahmeraums 5.The common connecting
Bei dem Einsatz von zwei wannenförmigen Gehäuseelementen 2a, 2b ist der gemeinsame Verbindungssteg 10 vorzugsweise zwischen beiden Trennstegen 20 angeordnet und weiter vorzugsweise mit diesem verpresst und/oder verschraubt und/oder verlötet.
Für den Fall, dass nur ein wannenförmiges Gehäuseelement 2a verwendet wird, ist der gemeinsame Verbindungssteg 10 vorzugsweise zwischen dem Trennsteg 20 und der Deckelanordnung 2c angeordnet, weiter vorzugsweise mit diesen verklemmt bzw. verpresst und/oder verlötet und/oder verschraubt. Das erste Ende 8 der jeweiligen Resonator-Innenleiter 7a bis 7n umfasst beispielsweise ein Segment, welches in Richtung der Stirnwand 4a gebogen ist, so dass die Resonator-Innenleiter 7a bis 7n über den überwiegenden Teil ihrer Länge um einen vorbestimmten Abstand beabstandet zur Deckelanordnung 2c verlaufen. Der Abstand zur Deckelanordnung 2c beträgt vorzugsweise mehr als 10% oder 20% oder 30% oder 40% des Abstands zwischen der Stirnseite 4a und der Deckelanordnung 2c.In the event that only one trough-shaped housing element 2a is used, the common connecting
In den
In
In
Die Podestanordnung 11 ist zumindest teilweise von einer Befestigungsöffnung 28 durchsetzt und weist vorzugsweise ein Gewinde auf. Eine Schraube 26 mit einem Schraubenkörper 26a und einem Schraubenkopf 26b greift in die beiden Podestanordnungen 11 ein. Durch Anziehen der Schraubverbindung werden beide Podestanordnungen 11, also beide wannenförmigen Gehäuseelemente 2a, 2b, aufeinander zu gedrückt. Dabei ist lediglich diejenige Podestanordnung 11 der beiden Podestanordnungen 11 mit einem Gewinde ausgeführt, die vom Schraubenkopf 26b weiter beabstandet ist. Der Schraubenkörper 26a durchsetzt dabei auch die Resonator-Innenleiteranordnung 6, 6a. Diese ist vorzugsweise ausschließlich gewindefrei ausgebildet. In dem dargestellten Beispiel ist die Öffnung 27 in der Resonator-Innenleiteranordnung 6, 6a größer als der Durchmesser des Schraubenkörpers 26a.The
Der Schraubenkopf 26b ist außerhalb des Gehäuses 2 angeordnet. In dem gezeigten Ausführungsbeispiel umfasst das Gehäuse 2 insbesondere das weitere wannenförmige Gehäuseelement 2b eine Einbuchtung, in welcher der Schraubenkopf 26b angeordnet ist, so dass er nicht über die restliche Stirnwand 4b des Gehäuseelements 2b hervorsteht. Der Schraubenkopf 26b ist daher in einem von außen zugänglichen Aufnahmeraum in einem der beiden Gehäuseelemente 2a, 2b versenkt.The
Die Öffnungen, insbesondere die Befestigungsöffnungen 28 durchsetzen in dem Ausführungsbeispiel beide Podestanordnungen 11 vollständig. Die Podestanordnungen 11 sind vorzugsweise einzig einteilig an den jeweiligen Stirnwänden 4a, 4b ausgebildet und beabstandet von den Seitenwänden 3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4 der wannenförmigen Gehäuseelement 2a, 2b angeordnet. Die Podestanordnungen 11 berühren (kontaktieren) bevorzugt direkt die Resonator-Innenleiteranordnung 6, 6a ohne dass noch ein Dielektrikum dazwischen angeordnet ist.The openings, in particular the
In
Zwischen der Resonator-Innenleiteranordnung 6, 6a und dem Gehäusedeckel 2c ist noch ein Abstandshalter 30 angeordnet. Die zumindest eine Resonator-Innenleiteranordnung 6, 6a ist daher zwischen der Podestanordnung 11 und dem zumindest einen Abstandshalter 30 eingeklemmt. Der Abstandshalter 30 kann aus einem dielektrischen Material oder aus einem elektrisch leitfähigen Material bestehen. Die Befestigungsöffnung 28, in die die Schraubverbindung 26 zumindest teilweise eingreift, setzt sich durch die Resonator-Innenleiteranordnung 6, 6a und den zumindest einen Abstandshalter 30 und die Deckelanordnung 2c fort. Der Schraubenkörper tritt von außerhalb des Gehäuses 2 durch die Befestigungsöffnung 28 in der Deckelanordnung 2c ein und durchsetzt den Abstandshalter 30 sowie die Resonator-Innenleiteranordnung 6, 6a vollständig und die Podestanordnung 11 zumindest teilweise. Der Schraubenkopf 26b ist außerhalb des Gehäuses 2 auf einer Außenseite der Deckelanordnung 2c angeordnet.A
Der Querschnitt durch das erfindungsgemäße Koaxialfilter 1 gemäß
Wie im Hinblick auf die Ausführungsbeispiele zu den
Im Hinblick auf
Bei der Schraube 26 kann es sich um eine elektrisch leitfähige Schraube oder um eine Schraube 26 aus einem dielektrischen Material handeln.The
Im Gegensatz dazu erläutert
Die Ausführungen der
In
Es können dabei auch mehrere Koppelöffnungen 15 eingesetzt werden, die beliebige Abmessungen und Formen aufweisen können (z.B. quadratisch, reckeckig, schlitzförmig, rund, oval).A plurality of
Die
In
Zwischen den beiden Resonator-Innenleiteranordnungen 6, 6a, 6b kann noch ein Trennelement eingesetzt werden, um die Kopplung zu reduzieren. Weiterhin ist es möglich, Abstimmelemente in Form von Abstimmschrauben von außerhalb des Gehäuses 2 unterschiedlich weit in den Aufnahmeraum 5 einzudrehen, um das Koaxialfilter 1 abstimmen zu können.A separating element can also be used between the two resonator inner conductor arrangements 6, 6a, 6b in order to reduce the coupling. It is also possible to screw tuning elements in the form of tuning screws from outside the housing 2 to different distances into the receiving space 5 in order to be able to tune the
Grundsätzlich können auch Trennblenden eingesetzt werden, die vorzugsweise galvanisch mit dem Gehäuse 2 verbunden sind. Eine solche Trennblende wird zwischen den Abstandsraum von zwei benachbarten Resonator-Innenleitern 7a bis 7n geschoben, um die direkte Kopplung zumindest teilweise zu reduzieren. Sie können auch nur an den Seitenwänden 3a1 bis 3a4 bzw. 3b1 bis 3b4 und/oder an den Stirnwänden 4a, 4b ausgebildet sein, um das Volumen geringfügig zu reduzieren. Es gilt dennoch, dass zwei benachbarte Resonator-Innenleiter 7a bis 7n über ihre gesamte Länge oder über ihre überwiegende Länge in Sichtverbindung zueinander stehen.In principle, partitions can also be used, which are preferably galvanically connected to the housing 2. Such a partition is pushed between the space between two adjacent resonator
Das erfindungsgemäße Koaxialfilter 1 kann beliebige Abmessungen aufweisen, die sich je nach dem eingesetzten Frequenzbereich unterscheiden. Die Anwendungsfrequenzbereiche liegen bei einem solchen Koaxialfilter 1 typischerweise zwischen 500 MHz und 4500 MHz. Ein Einsatz darüber oder darunter ist ebenfalls denkbar.The
Das Gehäuse 2 des Koaxialfilters 1 kann Seitenlängen aufweisen, die größer sind als 20mm, 50mm, 75mm, 100mm, 150mm, 200mm, 250 oder 300 mm und die vorzugsweise kleiner sind als 400mm, 375mm, 325mm, 275mm, 225mm, 175mm, 125mm, 90mm, 70mm oder 40mm. Diese Seitenlängen gelten insbesondere in X- bzw. Y-Richtung, also entlang der jeweiligen Seitenwände 3a1, 3a2, 3a3, 3a4 bzw. 3b1, 3b2, 3b3, 3b4.The housing 2 of the
Das Gehäuse 2 des Koaxialfilters 1 kann eine Dicke aufweisen, die vorzugsweise größer ist als 3mm, 5mm, 7mm, 9mm, 11mm, 13mm oder 15mm und die weiter vorzugsweise kleiner ist als 30mm, 25mm, 20mm, 17mm, 13mm, 12mm, 10mm, 6mm oder 4mm. Meistens liegt sie zwischen 7mm und 10mm. Die Wandstärke von Blechen (z.B. der Resonator-Innenleiter 7a, ..., 7n) und/oder von den Gehäuseelementen 2a, 2b und/oder von der Deckelanordnung 2c und/oder von den Stirnwänden 4a, 4b ist vorzugsweise größer als 0,5mm, 1mm, 1,5mm, 2mm, 2,5mm, 3mm, 3,5mm, 4mm, 4,5mm oder 5mm und weiter vorzugsweise kleiner als 7mm, 6mm, 4,8mm, 3,8mm, 2,8mm, 1,8mm oder 0,8mm. Meistens liegt sie in einem Bereich zwischen 1mm bis 2mm.The housing 2 of the
Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt. Der Schutzumfang wird durch die angehängten Ansprüche definiert.The invention is not restricted to the exemplary embodiments described. The scope of protection is defined by the appended claims.
Claims (15)
- Coaxial filter (1) having the following features:- a housing (2) that delimits a common receiving space (5) ;- the housing (2) consists of an electrically conducting material and comprises a trough-shaped housing element (2a) that has sidewalls (3a1, 3a2, 3a3, 3a4) and a front wall (4a), wherein between the sidewalls (3a1, 3a2, 3a3, 3a4), a space (5a) is closed off by the front wall (4a) on one of their sides, and wherein the sidewalls (3a1, 3a2, 3a3, 3a4) are integral with the front wall (4a);- the housing (2) further comprises:a) a further trough-shaped housing element (2b) that comprises sidewalls (3b1, 3b2, 3b3, 3b4) and a front wall (4b), wherein a further space (5b) between the sidewalls (3b1, 3b2, 3b3, 3b4) is closed off on one of their sides by the front wall (4b), wherein the sidewalls (3b1, 3b2, 3b3, 3b4) are integral with the front wall (4b), and wherein the two trough-shaped housing elements (2a, 2b) are placed on top of one another, and so the sidewalls (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) of both trough-shaped housing elements (2a, 2b) run between the two front walls (4a, 4b) and surround the receiving space (5) which is formed by the two spaces (5a, 5b); orb) a lid arrangement (2c), wherein the sidewalls (3a1, 3a2, 3a3, 3a4) run between the front wall (4a) and the lid arrangement (2c) and surround the receiving space (5) which is formed by the space (5a);- in addition, at least one resonator inner conductor arrangement (6, 6a) with a one-piece design is provided which is arranged in the receiving space (5), and which preferably consists of or comprises a punched and/or lasered metal sheet;- the at least one resonator inner conductor arrangement (6, 6a) comprises a plurality of resonator inner conductors (7a, ..., 7n) which lie in the same plane and have a first end (8) and a second end (9) spaced apart from the first end (8);- the at least one resonator inner conductor arrangement (6, 6a) comprises a connecting bridge (10), on which the resonator inner conductors (7a, ..., 7n) are connected to with their first end (8) in an electrically conducting manner;- at least two adjacent resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a), which extend in the same direction away from the connecting bridge (10), are in the line of sight of one another over their entire length or over their predominant length;- at least one pedestal arrangement (11), wherein the at least one pedestal arrangement (11) extends in direction of the at least one resonator inner conductor arrangement (6, 6a) and ends at a distance therefrom;- the at least one pedestal arrangement (11) is integrally:a) formed on the front wall (4a, 4b) of a trough-shaped housing element (2a, 2b) if the housing (2) comprises another trough-shaped housing element (2b); orb) formed on the lid arrangement (2c) if the housing (2) comprises a lid arrangement (2c); and- the sidewalls (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) and the front wall (4a, 4b) of the housing element (2a, 2b) consist of a casting and/or extrusion and/or milling part or comprise a casting and/or extrusion and/or milling part;- the resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a) extend on both sides away from the connecting bridge (10);- the connecting bridge (10) is divided into different connecting bridge sections (10a, ..., 10n), wherein the connecting bridge sections (10a, ..., 10n) run offset to one another;- the resonator inner conductor arrangement (6, 6a) is screwed and/or clamped to the housing (2).
- Coaxial filter (1) according to claim 1, with the following features:- the at least one pedestal arrangement (11) comprises a plurality of individual pedestals spaced apart from one another or a continuous pedestal that extends over at least 50% along the length of a sidewall (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) ;- the at least one pedestal arrangement (11) consists of or comprises an electrically conducting material.
- Coaxial filter (1) according to one of the previous claims, with the following feature:- the at least one resonator inner conductor arrangement (6, 6a) is galvanically separated from the housing (2).
- Coaxial filter (1) according to claim 1 or 2, with the following features:- the at least one resonator inner conductor arrangement (6, 6a) is soldered to a side wall (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) of a trough-shaped housing element (2a, 2b) if the housing (2) comprises a further trough-shaped housing element (2b); or- the at least one resonator inner conductor arrangement (6, 6a) comprises a segment (38) which is curved at least with regard to the predominant part of the resonator inner conductors (7a, ... , 7n) in the direction of the front side (4a, 4b) of a trough-shaped housing element (2a, 2b) and is soldered thereto if the housing (2) comprises a further trough-shaped housing element (2b), or which is curved at least with regard to the predominant part of the resonator inner conductors (7a, ..., 7n) in the direction of the lid arrangement (2c) and is soldered thereto if the housing (2) comprises a lid arrangement (2c).
- Coaxial filter (1) according to one of the previous claims, with the following feature:- the housing (2) has a thickness which is larger than 3mm, 5mm, 7mm, 9mm, 11mm, 13mm or 15mm and which is smaller than 30mm, 25mm, 20mm, 17mm, 13mm, 12mm, 10mm, 6mm or 4mm.
- Coaxial filter (1) according to one of the previous claims, with the following feature:- at least two or all resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a) are of the same or different length.
- Coaxial filter (1) according to one of the previous claims, with the following feature:- at least two resonator inner conductors (7a, ..., 7n) or all resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a) have over a first partial length (13a) beginning at the first end (8), a smaller width than over a second partial length (13b), which ends at the second end (9), wherein the first partial length (13a) for at least two resonator inner conductors (7a, ..., 7n) preferably has a different length, resulting in a band-stop characteristic.
- Coaxial filter (1) according to one of the previous claims, with the following features:- at least one capacitive or inductive overcoupling between two resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a) that are not adjacent, whereina) the inductive overcoupling is formed by an overcoupling rod that is galvanically connected to the two resonator inner conductors (7a, ..., 7n) and runs between them and a front wall (4a, 4b) of a trough-shaped housing element (2a, 2b) if the housing (2) comprises a further trough-shaped housing element (2b), or the lid arrangement (2a) if the housing (2) comprises a lid arrangement (2c); orb) the capacitive overcoupling is formed by an overcoupling element (14), having at least two galvanically connected capacitive coupling surfaces (14a, 14b), wherein each of said capacitive coupling surfaces (14a, 14b) is arranged spaced apart between one of the two resonator inner conductors (7a, ..., 7n) and a front wall (4a, 4b) of a trough-shaped housing element (2a, 2b) if the housing (2) comprises a further trough-shaped housing element (2b), or the lid arrangement (2a) if the housing (2) comprises a lid arrangement (2c), wherein the overcoupling element (14) is galvanically separated from the resonator inner conductors (7a, ..., 7n) and the housing (2).
- Coaxial filter (1) according to one of the previous claims, with the following features:- one electrically conducting separator (20) each begins on each sidewall (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) of both trough-shaped housing elements (2a, 2b) placed on top of one another if the housing (2) comprises a further trough-shaped housing element (2b), or an electrically conducting separator (20) begins on a sidewall (3a1, 3a2, 3a3, 3a4) of the one trough-shaped housing element (2a) if the housing (2) comprises a lid arrangement (2c) and is connected to these or this sidewall (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) galvanically conductingly and protrudes into the receiving space (5) and runs in the direction of a second sidewall (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) which is opposite of the first sidewall (3a1, 3a2, 3a3, 3a4, 3b1, 3b2, 3b3, 3b4) and ends there by forming an opening (21) with it, thus dividing the receiving space (5) at least into a first receiving chamber (51) and into a second receiving chamber (52) and the opening (21) which connects the at least two receiving chambers (51, 52);- a plurality of resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a) are arranged in the first and the second receiving chamber (51, 52) of the receiving space (3).
- Coaxial filter (1) according to claim 9, with the following features:- the connecting bridge (10) is:a) arranged between the two separators (20) if the housing (2) comprises a further trough-shaped housing element (2b); orb) arranged between the separator (20) and the lid arrangement (2c) if the housing (2) comprises a lid arrangement (2c), wherein the first end (8) of the corresponding resonator inner conductors (7a, ..., 7n) has a segment that is curved in the direction of the front wall (4a), so that the resonator inner conductors (7a, ..., 7n) run over the predominant part of their length spaced apart at a predefined distance from the lid arrangement (2c).
- Coaxial filter (1) according to one of the previous claims, with the following features:- a further resonator inner conductor arrangement (6, 6b), wherein:a) if the housing (2) comprises a further trough-shaped housing element (2b), the at least one resonator inner conductor arrangement (6, 6a) is fastened to the front wall (4a) of the trough-shaped housing element (2a), and the further resonator inner conductor arrangement (6, 6b) is fastened to the front wall (4b) of the further trough-shaped housing element (2b); orb) if the housing (2) comprises a lid arrangement (2c), the coaxial filter comprises an additional trough-shaped housing element (2b), wherein the front wall (4a) of the trough-shaped housing element (2a), which is closed with the lid arrangement (2c), is placed onto the sidewalls (3b1, 3b2, 3b3, 3b4) of the additional trough-shaped housing element (2b), thus forming a further receiving space, wherein the further resonator inner conductor arrangement (6, 6b) is arranged in the further receiving space, and wherein at least one coupling opening (15) is introduced in the front wall (4a) of the trough-shaped housing element (2a), so that a coupling between the individual resonator inner conductor arrangements (6, 6a, 6b) in the different receiving spaces (5) is possible.
- Coaxial filter (1) according to claim 11, wherein, if the housing (2) comprises a further trough-shaped housing element (2b):- between the resonator inner conductor arrangement (6, 6a) and the further resonator inner conductor arrangement (6, 6b), which are arranged in the same receiving space (5), a separating wall is arranged, having at least one coupling opening, through which the individual resonator inner conductor arrangements (6, 6a, 6b) are coupled; or- the resonator inner conductor arrangement (6, 6a) and the further resonator inner conductor arrangement (6, 6b), which are arranged in the same receiving space (5), are connected to one another by means of a curved connecting section (40) and designed as one piece.
- Coaxial filter (1) according to one of the previous claims, with the following feature:- at least one first and one second and one third coupling and/or decoupling device (12a, 12b, 12c), which are arranged at different locations of the housing (2) and project into the receiving space (5) from outside the housing (2) and establish a capacitive or inductive or galvanic coupling to different resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a).
- Coaxial filter (1) according to one of the claims 1 to 13, with the following features:- the second end (9) of at least one or all resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a):a) runs angled, for example L-shaped; orb) double-angled, for example T-shaped or is U-shaped.
- Coaxial filter (1) according to one of the previous claims, with the following feature:- at least one or all of the resonator inner conductors (7a, ..., 7n) of the at least one resonator inner conductor arrangement (6, 6a) extend obliquely or at right angles away from the connecting bridge (10).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017119907.1A DE102017119907A1 (en) | 2017-08-30 | 2017-08-30 | coaxial filter |
Publications (2)
Publication Number | Publication Date |
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EP3451441A1 EP3451441A1 (en) | 2019-03-06 |
EP3451441B1 true EP3451441B1 (en) | 2021-11-17 |
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ID=63294136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP18189464.3A Active EP3451441B1 (en) | 2017-08-30 | 2018-08-17 | Coaxial filter |
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US (1) | US11245167B2 (en) |
EP (1) | EP3451441B1 (en) |
CN (1) | CN109428140B (en) |
DE (1) | DE102017119907A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN112567572A (en) * | 2018-06-04 | 2021-03-26 | 上海诺基亚贝尔股份有限公司 | Cavity filter |
CN110492208A (en) * | 2019-07-26 | 2019-11-22 | 西安电子科技大学 | The flat coaxial cavity filter of miniaturization |
KR20210158304A (en) * | 2020-06-23 | 2021-12-30 | 삼성전자주식회사 | Antenna filter and electronic device inlcuding the same |
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US3597709A (en) * | 1969-03-24 | 1971-08-03 | Microwave Dev Lab Inc | Filter having direct and cross-coupled resonators |
JPS58166803A (en) * | 1982-03-27 | 1983-10-03 | Fujitsu Ltd | Dielectric filter |
US4596969A (en) | 1985-05-08 | 1986-06-24 | Orion Industries, Inc. | Interdigital duplexer with notch resonators |
US5225799A (en) * | 1991-06-04 | 1993-07-06 | California Amplifier | Microwave filter fabrication method and filters therefrom |
DE4330491A1 (en) | 1993-09-09 | 1995-03-16 | Kolbe & Co Hans | N-loop (N-circle, N-circuit) RF filter |
FI110392B (en) * | 1995-09-26 | 2003-01-15 | Solitra Oy | Coaxial resonator filter, method of producing a coaxial resonator filter, coaxial resonator structure and method of producing a coaxial resonator structure |
SE508680C2 (en) * | 1996-06-19 | 1998-10-26 | Ericsson Telefon Ab L M | Integrated filters |
CN1222257A (en) | 1996-06-19 | 1999-07-07 | 艾利森电话股份有限公司 | Integrated filter |
DE102004010683B3 (en) | 2004-03-04 | 2005-09-08 | Kathrein-Werke Kg | High frequency filter in coaxial resonator configuration, used in mobile telephone, includes dielectric layer between cover and free end of inner conducting tube |
CN200962447Y (en) | 2006-09-29 | 2007-10-17 | 深圳国人通信有限公司 | Built-in coaxial cavity band resistance filter of the transmission line |
KR100918791B1 (en) | 2007-08-28 | 2009-09-25 | 주식회사 에이스테크놀로지 | Frequency Tunable Filter |
EP2056394B1 (en) * | 2007-10-31 | 2013-09-04 | Alcatel Lucent | Cavity resonator |
CN101276952B (en) | 2008-04-15 | 2012-08-22 | 华南理工大学 | Mixed coupling coaxial cavity filter capable of controlling electromagnetism |
EP2287964A1 (en) | 2009-08-19 | 2011-02-23 | Alcatel Lucent | Device for filtering radio frequency signals and system thereof |
FI127061B (en) * | 2014-05-23 | 2017-10-31 | Tongyu Tech Oy | Control element for radio frequency resonator |
FI126467B (en) | 2014-05-23 | 2016-12-30 | Tongyu Tech Oy | RF filter |
DE102016104608A1 (en) * | 2016-03-14 | 2017-09-14 | Kathrein-Werke Kg | Coaxial filter in frame construction |
-
2017
- 2017-08-30 DE DE102017119907.1A patent/DE102017119907A1/en not_active Ceased
-
2018
- 2018-08-17 EP EP18189464.3A patent/EP3451441B1/en active Active
- 2018-08-24 US US16/111,591 patent/US11245167B2/en active Active
- 2018-08-30 CN CN201810998761.9A patent/CN109428140B/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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US20190067771A1 (en) | 2019-02-28 |
DE102017119907A1 (en) | 2019-02-28 |
CN109428140B (en) | 2022-04-29 |
EP3451441A1 (en) | 2019-03-06 |
US11245167B2 (en) | 2022-02-08 |
CN109428140A (en) | 2019-03-05 |
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