CN113964465B - Adjustable inductive cross coupling structure of cavity filter - Google Patents
Adjustable inductive cross coupling structure of cavity filter Download PDFInfo
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- CN113964465B CN113964465B CN202111204923.5A CN202111204923A CN113964465B CN 113964465 B CN113964465 B CN 113964465B CN 202111204923 A CN202111204923 A CN 202111204923A CN 113964465 B CN113964465 B CN 113964465B
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- 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
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to an adjustable inductive cross coupling structure of a cavity filter, which comprises a cavity and a cover plate covered on the cavity, wherein a plurality of resonant cavities separated by partition walls are arranged in the cavity, an inductive cross coupling window is arranged between at least two resonant cavities arranged diagonally, a U-shaped metal column is connected to the inner side wall of the cover plate, the U-shaped metal column penetrates through the inductive cross coupling window and is respectively positioned in the two diagonally arranged resonant cavities, a coupling fine tuning screw is connected to the cover plate in a threaded manner, and the coupling fine tuning screw is positioned on the plane of the U-shaped metal column. According to the adjustable inductive cross coupling structure, the U-shaped metal columns and the coupling fine adjustment screws are arranged on the same plane, so that the inductive cross coupling coefficient can be adjusted by rotating the coupling fine adjustment screws under the condition that the cover plate is not opened, the adjustable inductive cross coupling structure is simple and easy to operate, the production efficiency can be greatly improved, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of filter correlation, in particular to an adjustable inductive cross coupling structure of a cavity filter.
Background
The cavity filter is a microwave filter adopting a resonant cavity structure, and comprises a cavity, a cover plate, a resonant rod (which can be integrally formed with the cavity), a fine tuning screw rod and the like, which are good conductors. One resonant cavity can be equivalent to an inductor parallel capacitor, so that a resonant level is formed, the microwave filtering function is realized, and the resonant cavity has more advantages and is generally applied to various communication systems.
The cavity filter is provided with n resonant cavities, wherein n is more than or equal to 2, each resonant cavity has own frequency, and the resonant cavities are coupled with the resonant cavities through windows and transmit signals. Because the frequency of each resonant cavity and the coupling between the resonant cavities are difficult to realize through precise machining, in practical engineering, the approximate dimensions of structures such as the resonant cavities, windows and the like are generally determined according to software simulation, and finally, in the debugging process, the frequency of the resonant cavities and the coupling coefficient between the resonant cavities are determined through rotating the frequency fine tuning screw and the coupling fine tuning screw by a screwdriver.
For an n-order cavity filter, the coupling coefficient is only K if 12 ，K 23 ，…，K n-2，n-1 ，K n-1，n According to the filter principle, the filter has no zero outside the band, and the bandThe external inhibitory ability is low. In order to increase the out-of-band rejection capability, a cross-coupling structure is usually arranged between two non-adjacent resonant cavities, for example, between the cavities of opposite chains, so as to increase the out-of-band zero point, thereby increasing the out-of-band rejection capability of the filter.
Coupling is classified into capacitive and inductive in terms of coupling properties. Capacitive cross coupling is usually realized by using a flying bar, and the fine tuning method of the structure is solved by the method in the patent of a cavity filter and a cross coupling structure of the cavity filter. For inductive cross-coupling, if the distance between the two resonators is long, the coupling coefficient is very small even if windowing is used between the two resonators, and in this case the coupling coefficient is not sensitive to the trim screw, and the traditional windowing + trim screw approach has been defeated.
Disclosure of Invention
The invention aims to solve the technical problem of providing an adjustable inductive cross-coupling structure of a cavity filter aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: an adjustable inductive cross-coupling structure of a cavity filter comprises a cavity and a cover plate covered on the cavity in a sealing mode, wherein a plurality of resonant cavities separated by partition walls are arranged in the cavity, an inductive cross-coupling window is formed between at least two diagonally arranged resonant cavities, a U-shaped metal column is connected to the inner side wall of the cover plate, the U-shaped metal column penetrates through the inductive cross-coupling window and is located in the two diagonally arranged resonant cavities respectively, a coupling fine-tuning screw is connected to the cover plate in a threaded mode, and the coupling fine-tuning screw is located on the plane where the U-shaped metal column is located.
The invention has the beneficial effects that: according to the adjustable inductive cross coupling structure, the U-shaped metal columns and the coupling fine adjustment screws are arranged on the same plane, so that the inductive cross coupling coefficient can be adjusted by rotating the coupling fine adjustment screws under the condition that the cover plate is not opened, the adjustable inductive cross coupling structure is simple and easy to operate, the production efficiency can be greatly improved, and the production cost is reduced.
On the basis of the technical scheme, the invention can be further improved as follows.
Furthermore, the U-shaped metal column comprises two fixed arms and a connecting arm, two ends of the connecting arm are respectively and vertically and fixedly connected with one end of each of the two fixed arms, the other ends of the two fixed arms are respectively and vertically fixed on the inner side wall of the cover plate, and a square ring is encircled between the U-shaped metal column and the cover plate.
The beneficial effect of adopting the further scheme is that: the U-shaped metal column and the cover plate are encircled to form a square ring, the two sides of the square ring are positioned in the two resonant cavities, and the adjusting effect is obvious.
Furthermore, at least one of the two diagonally arranged resonant cavities is internally provided with the coupling fine tuning screw.
The beneficial effect of adopting the further scheme is that: the U-shaped metal column is arranged, and the coupling coefficient can be finely adjusted by arranging the coupling fine adjustment screw in at least one resonant cavity.
Furthermore, at least one coupling fine adjustment screw is respectively arranged in the two diagonally arranged resonant cavities.
The beneficial effect of adopting the further scheme is that: at least one coupling fine tuning screw is arranged in each resonant cavity respectively, and the inductive cross coupling coefficient of each resonant cavity can be adjusted.
Furthermore, two coupling fine tuning screws are respectively arranged in the two diagonally arranged resonant cavities.
Furthermore, in each resonant cavity, at least one coupling fine adjustment screw is respectively arranged on two sides of the connecting position of the U-shaped metal column and the cover plate.
Further, in each resonant cavity, the distance between each coupling fine tuning screw and the connecting end of the U-shaped metal column is the same.
The beneficial effect of adopting the further scheme is that: the stability of adjusting the inductive cross coupling coefficient is facilitated.
Furthermore, all the coupling fine tuning screws are arranged in a straight line.
The beneficial effect of adopting the further scheme is that: the coupling fine adjustment screws arranged in a straight line shape are adopted, and the adjustment effect is obvious.
Further, the U-shaped metal column is connected on the cover plate and is mutually communicated with the cover plate, and the coupling fine adjustment screw is connected with an adjusting nut.
The beneficial effect of adopting the further scheme is that: the U-shaped metal column and the cover plate are mutually communicated, the U-shaped metal column and the cover plate can be welded in a communication mode, the U-shaped metal column and the cover plate can also be connected through conductive adhesive, the cover plate does not need to be opened, and the inductive cross coupling coefficient can be adjusted only by adjusting the coupling fine adjustment screw.
Drawings
FIG. 1a is a schematic top view of a conventional cavity filter;
FIG. 1b is a schematic cross-sectional view of C-C in FIG. 1 a;
FIG. 2a is a schematic top view of another structure of a conventional cavity filter;
FIG. 2b is a schematic cross-sectional view of C-C in FIG. 2 a;
FIG. 3a is a schematic top view of an embodiment of a tunable inductive cross-coupling structure of a cavity filter according to the present invention;
FIG. 3b is a schematic cross-sectional view taken along line C-C in FIG. 3 a;
fig. 4a is a schematic top view of another embodiment of a tunable inductive cross-coupling structure of a cavity filter according to the present invention;
FIG. 4b is a schematic cross-sectional view of the structure of FIG. 4a taken along line D-D;
FIG. 4C is a schematic cross-sectional view of the structure of FIG. 4a taken along line C-C;
FIG. 5 is a schematic diagram of a tunable inductive cross-coupling structure of a cavity filter with 8 resonators according to the present invention;
fig. 6 is a schematic diagram of a tunable inductive cross-coupling structure of a cavity filter with 8 resonators according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. a cavity; 11. a resonant cavity; 12. an inductive cross-coupling window; 2. a cover plate; 3. coupling the fine adjustment screw; 4. a U-shaped metal column; 6. a resonant rod; 7. the screws are tuned.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1a to 4c, the adjustable inductive cross-coupling structure of a cavity filter of this embodiment includes a cavity 1 and a cover plate 2 covering the cavity 1, the cavity 1 has a plurality of resonant cavities 11 separated by partition walls, at least two diagonally arranged resonant cavities 11 have an inductive cross-coupling window 12 therebetween, the inner side wall of the cover plate 2 is connected with a U-shaped metal column 4, the U-shaped metal column 4 passes through the inductive cross-coupling window 12 and is respectively located in the two diagonally arranged resonant cavities 11, the cover plate 2 is connected with a coupling trimming screw 3 through a thread, and the coupling trimming screw 3 is located on a plane where the U-shaped metal column 4 is located.
For inductive cross coupling, if the distance between the two resonant cavities is long, even if a windowing measure is adopted between the two resonant cavities, the coupling coefficient is very small, and the coupling coefficient is insensitive to a fine tuning screw under the condition, and the mode of only adopting windowing to match with the fine tuning screw is lost, by adopting the adjustable inductive cross coupling structure of the embodiment, a window is formed between the two resonant cavities, the two ends of the U-shaped metal column 4 are fixed on the cover plate 2 and are well electrically communicated with the cover plate 2, an annular structure is formed between the U-shaped metal column 4 and the cover plate 2, the height of the annular structure is smaller than that of the inductive cross coupling window 12, the two sides of the annular structure are positioned in the two coupled resonant cavities, the two sides of the U-shaped metal column 4 are respectively fixed on the cover plate 2 in a threaded connection mode by adopting the coupling fine tuning screw 3, and the coupling fine tuning screw 3 is in a threaded connection with the cover plate 2, therefore, the height of the coupling fine tuning screw 3 in the resonant cavity 11 can be adjusted in a mode of rotating the coupling fine tuning screw 3, and after the coupling fine tuning screw 3 is adjusted to a required position, and therefore, the filter can be realized under the condition that the cavity is not opened.
As shown in fig. 3b and fig. 4b, the U-shaped metal column 4 of this embodiment includes two fixing arms and a connecting arm, two ends of the connecting arm are respectively and fixedly connected to one end of each of the two fixing arms, the other ends of the two fixing arms are respectively and fixedly connected to the inner side wall of the cover plate 2, and a square ring is enclosed between the U-shaped metal column 4 and the cover plate 2. The U-shaped metal column and the cover plate are encircled to form a square ring, the two sides of the square ring are positioned in the two resonant cavities, and the adjusting effect is obvious.
And at least one of the two diagonally arranged resonant cavities is internally provided with the coupling fine tuning screw. The U-shaped metal column is arranged, and the coupling coefficient can be finely adjusted by arranging the coupling fine adjustment screw in at least one resonant cavity.
A preferable solution of this embodiment is that, as shown in fig. 3a to 4c, at least one coupling fine tuning screw 3 is respectively disposed in two diagonally-arranged resonant cavities 11 of this embodiment, and all the coupling fine tuning screws 3 are arranged in a straight line. At least one coupling fine tuning screw is arranged in each resonant cavity respectively, the inductive cross coupling coefficient of each resonant cavity can be adjusted, and the coupling fine tuning screws arranged in a straight line are adopted, so that the adjusting effect is obvious. In practical engineering, only one or two coupling trimming screws 3 may be needed to realize trimming of the inductive cross-coupling coefficient of the cavity filter.
As shown in fig. 3b and fig. 4b, a further preferred solution of this embodiment is that two coupling trimming screws 3 are respectively disposed in two diagonally arranged resonant cavities 11.
As shown in fig. 3b and fig. 4b, a still further preferred solution of this embodiment is that, in each resonant cavity 11, at least one coupling fine tuning screw 3 is respectively disposed on both sides of a connection position of the U-shaped metal column 4 and the cover plate 2.
As shown in fig. 3b and 4b, an alternative of this embodiment is that in each resonant cavity 11, the distance between each coupling fine adjustment screw 3 and the connection end of the U-shaped metal column 4 is the same. The stability of adjustment of the inductive cross coupling coefficient is facilitated.
In various alternatives of the present embodiment, all the coupling fine adjustment screws 3 are arranged in a straight line. The coupling fine adjustment screws arranged in a straight line shape are adopted, and the adjustment effect is obvious.
As shown in fig. 3b and 4b, the bottom of the U-shaped metal pillar 4 of this embodiment is spaced from the bottom of the inductive cross-coupling window 12.
As shown in fig. 3b and 4b, the U-shaped metal column 4 of this embodiment is connected to the cover plate 2 and is conducted with the cover plate 2, and the coupling fine adjustment screw 3 is connected with an adjustment nut. The U-shaped metal column and the cover plate are mutually communicated, the U-shaped metal column and the cover plate can be welded in a communication mode, the U-shaped metal column and the cover plate can also be connected through conductive adhesive, the cover plate does not need to be opened, and the inductive cross coupling coefficient can be adjusted only by adjusting the coupling fine adjustment screw.
As shown in fig. 4a, a coupling fine tuning screw 3 is also disposed between at least two adjacent resonant cavities 11, and an adjusting nut is also connected to the coupling fine tuning screw 3.
As shown in fig. 3a to 4c, a hollow resonant rod 6 is disposed in each resonant cavity 11, the cover plate 2 is further connected with a tuning screw 7, one end of the tuning screw 7 is disposed in the resonant rod 6, and the tuning screw 7 is also connected with an adjusting nut. The tuning screw is deeper into the resonance rod, the relative contact area between the tuning screw and the resonance rod is larger, the capacitance is larger, the frequency of the filter is smaller, and the frequency of the filter can be adjusted through the tuning screw.
As shown in fig. 5 and fig. 6, a plurality of resonant cavities 11 are disposed in the cavity of the tunable inductive cross-coupling structure of the cavity filter of this embodiment, and the plurality of resonant cavities 11 may be disposed adjacently or arranged in a cross manner. For example, 8 resonant cavities 11 are arranged in the cavity 1, as shown in fig. 5, 8 resonant cavities 11 are arranged in the cavity 1, the adjacent cross-coupling selections include the No. 1 resonant cavity and the No. 8 resonant cavity 11, the No. 2 resonant cavity 11 and the No. 7 resonant cavity 11, the No. 3 resonant cavity 11 and the No. 6 resonant cavity 11, the non-adjacent cross-coupling selections include the No. 1 resonant cavity 11 and the No. 7 resonant cavity 11, the No. 2 resonant cavity 11 and the No. 6 resonant cavity 11, the No. 2 resonant cavity 11 and the No. 8 resonant cavity 11, the No. 3 resonant cavity 11 and the No. 5 resonant cavity 11, the No. 3 resonant cavity 11 and the No. 7 resonant cavity 11, and the No. 4 resonant cavity 11 and the No. 6 resonant cavity 11; as shown in fig. 6, 8 resonant cavities 11 are arranged in the cavity 1, a No. 2 resonant cavity 11 and a No. 3 resonant cavity 11, a No. 6 resonant cavity 11 and a No. 7 resonant cavity 11 are adjacently cross-coupled, and a No. 2 resonant cavity 11 and a No. 4 resonant cavity 11, a No. 5 resonant cavity 11 and a No. 7 resonant cavity 11 are non-adjacently cross-coupled.
For an existing inductive coupling model formed by two adjacent resonant cavities 11, as shown in fig. 1a and 1b, the wall thickness of the resonant cavity is 4mm, a window is formed in the middle of the top, the width of the window is 12mm, the height of the window is 16mm, and only one coupling fine adjustment screw 3 is arranged on a cover plate 2 at the window. According to software simulation, when the length of the tuning screw in the cavity is 1mm and 8mm, the corresponding coupling coefficients are respectively as follows: 0.002353,0.002717, difference 0.000364.
For an existing inductive coupling model formed by two non-adjacent resonant cavities 11, as shown in fig. 2a and 2b, the wall thickness between the resonant cavities is 4mm, a window is formed in the middle of the top, the height and the depth of the window are both 12mm, and only one coupling fine adjustment screw 3 is arranged at the cover plate 2 at the window. According to software simulation, the coupling coefficients of the fine tuning screw in the cavity are respectively as follows when the length of the fine tuning screw in the cavity is 1mm and 8 mm: 0.000062,0.00008, difference 0.000018. At the moment, the coupling coefficients of the two resonant cavities are very small, and the effect of the coupling fine adjustment screw is also very small. The reason is that the resonant cavities of the two specifications are far away from each other, the electromagnetic coupling between the resonant cavities is small, and the electromagnetic field at the position of the coupling fine adjustment screw is small, so that the action effect is not obvious.
For the inductive coupling model formed by two non-adjacent resonant cavities 11 in this embodiment, as shown in fig. 3a to 4c, by using the matching manner of the square ring and the coupling trimming screw, since the two ends of the square ring extend to the two mutually coupled resonant cavities, the greater the height and length of the square ring is, the more the magnetic force lines passing through the square ring are, and the greater the coupling between the two resonant cavities is. The coupling fine adjustment screws are distributed near the ends of the square ring, and the distribution of magnetic lines of force near the two ends of the square ring is changed due to the coupling fine adjustment screws, so that the size of a coupling coefficient can be changed through the fine adjustment screws. One preferred dimension of the square ring may be 10mm in height and 38mm in width. Due to symmetry, the two symmetrically arranged coupling fine tuning screws have the same function, and the fine tuning effect of the two coupling fine tuning screws in the same resonant cavity is simulated by software. According to software simulation, the coupling coefficients of the coupling fine adjustment screws outside the square ring are 0.003253 and 0.003843 respectively when the lengths of the coupling fine adjustment screws inside the cavity are 1mm and 8mm, and the difference value is 0.00059; the coupling coefficients of the coupling fine adjustment screws on the inner side of the square ring are respectively 0.003253 and 0.002786 when the lengths of the coupling fine adjustment screws in the cavity are 1mm and 8mm, and the difference is 0.000467. Therefore, the screws are placed at the two ends of the square ring, the difference value of the coupling coefficients is relatively large, the adjustment range is large, and the adjustment effect is more obvious.
The adjustable inductive cross coupling structure of the embodiment can realize the adjustment of the inductive cross coupling coefficient by rotating the coupling fine tuning screw without opening the cover plate by arranging the U-shaped metal column and the coupling fine tuning screw on the same plane, is simple and easy, can greatly improve the production efficiency, and reduces the production cost.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (3)
1. An adjustable inductive cross-coupling structure of a cavity filter is characterized by comprising a cavity and a cover plate covered on the cavity in a sealing manner, wherein a plurality of resonant cavities separated by partition walls are arranged in the cavity, an inductive cross-coupling window is arranged between at least two resonant cavities arranged diagonally, a U-shaped metal column is connected to the inner side wall of the cover plate, penetrates through the inductive cross-coupling window and is respectively positioned in the two diagonally arranged resonant cavities, a coupling fine-tuning screw is connected to the cover plate in a threaded manner, and the coupling fine-tuning screw is positioned on the plane of the U-shaped metal column; two coupling fine tuning screws are respectively arranged in the two diagonally arranged resonant cavities; in each resonant cavity, two sides of the connecting position of the U-shaped metal column and the cover plate are respectively provided with one coupling fine adjustment screw; in each resonant cavity, the distances between the coupling fine tuning screws and the connecting end of the U-shaped metal column are the same; the U-shaped metal column is connected on the cover plate and communicated with the cover plate, and the coupling fine adjustment screw is connected with an adjusting nut.
2. The tunable inductive cross-coupling structure of a cavity filter according to claim 1, wherein the U-shaped metal pillar comprises two fixing arms and a connecting arm, two ends of the connecting arm are respectively and vertically and fixedly connected to one end of the two fixing arms, the other ends of the two fixing arms are respectively and vertically fixed to an inner sidewall of the cover plate, and a square ring is defined between the U-shaped metal pillar and the cover plate.
3. The tunable inductive cross-coupling structure of a cavity filter of claim 1, wherein all the coupling trimming screws are arranged in a straight line.
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| CN202111204923.5A CN113964465B (en) | 2021-10-15 | 2021-10-15 | Adjustable inductive cross coupling structure of cavity filter |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361117A (en) * | 2011-09-29 | 2012-02-22 | 武汉虹信通信技术有限责任公司 | Capacitive cross coupling flying bar and coaxial cavity resonator thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6836198B2 (en) * | 2001-12-21 | 2004-12-28 | Radio Frequency Systems, Inc. | Adjustable capacitive coupling structure |
| CN2812313Y (en) * | 2005-06-01 | 2006-08-30 | 摩比天线技术（深圳）有限公司 | A cross coupling trimming device |
| CN102544658A (en) * | 2012-01-10 | 2012-07-04 | 深圳市大富科技股份有限公司 | Cavity filter and cross-coupling structure of cavity filter |
| CN109768359B (en) * | 2019-02-20 | 2020-10-02 | 武汉凡谷电子技术股份有限公司 | Harmonic wave improving filter composed of mixing cavity and mixing die |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361117A (en) * | 2011-09-29 | 2012-02-22 | 武汉虹信通信技术有限责任公司 | Capacitive cross coupling flying bar and coaxial cavity resonator thereof |
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