EP2517299A1 - Frequency-tunable microwave bandpass filter - Google Patents
Frequency-tunable microwave bandpass filterInfo
- Publication number
- EP2517299A1 EP2517299A1 EP10793260A EP10793260A EP2517299A1 EP 2517299 A1 EP2517299 A1 EP 2517299A1 EP 10793260 A EP10793260 A EP 10793260A EP 10793260 A EP10793260 A EP 10793260A EP 2517299 A1 EP2517299 A1 EP 2517299A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- guide
- conductive
- cavities
- partitions
- irises
- 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.)
- Granted
Links
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
- H01P1/207—Hollow waveguide 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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
-
- 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
- H01P1/2016—Slot line filters; Fin line filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
Definitions
- the invention particularly relates to a frequency tunable bandpass microwave filter produced by the waveguide technique.
- Microwave transmissions require the use of transmit and receive filters to select the frequency band in which the signal is transmitted. At microwave frequencies, it is possible to use guide filters which make it possible to obtain low losses and great selectivity.
- the filters may have a relative bandwidth of a fraction of a percent of the center frequency.
- US Patent 5,808,528 [4] discloses a band pass filter which comprises a waveguide having a plurality of conductive walls and a movable wall defining the "large" dimension "a" of the waveguide.
- the discontinuities created by a septum T with self-limiting obstacles in the vicinity of the axis of symmetry of the guide are used to define the cavities and the couplings of the filter (FIG. 1 a).
- Devices according to the prior art comprise cavities with end inductive admittances (made by means of iris or septum), for which the values of the equivalent inductive admittances (jB) at the ends of the cavities:
- FIG. 1c represents an example of an inductive iris according to the prior art.
- the object of the present invention relates to a microwave frequency tunable band pass filter comprising in combination at least the following elements:
- a rectangular section waveguide comprising a first fixed conductive portion I and a second movable conductive portion II,
- Said first fixed part I comprising three longitudinal conducting partitions forming three sides of the waveguide G, the section of the guide having a large side "a” defined by the position of the movable conductive part II when it is inserted in part I and a small side "b",
- Said first part I comprising a plurality of first conductive partitions with one or more conductive obstacles associated with the complementary openings in the section of the waveguide forming capacitive-type irises, said first partitions being mounted transversely to the propagation of the wave in the guide and defining a plurality of cavities Ki in the longitudinal direction of the guide and integral with the first portion I, and a plurality of second conductive partitions with one or more openings i defining capacitive-type irises and which form, in combination with the adjacent guide lengths of the inverters of immitance Ji, said first partitions forming a succession of resonant cavities Ki coupled by the immitance inverters Ji,
- Said mobile conductive part II comprising a wall, parallel to the short side "b" of the guide, forming the fourth face of the waveguide G, said wall defining the dimension value "a" of the long side of the guide and thus the central frequency of the filter, the second part II comprising a plurality of slots receiving the partitions of part I which form the capacitive-type irises, the cavities Ki thus being formed when the part I and the part II are nested,
- the capacitive type irises used to form the cavities Ki have, for example, an opening "d (x)" variable as a function of the abscissa x according to the side "a” which makes it possible to maintain the bandwidth of the filter constant when " a "varies.
- the variable "d (x)" aperture as a function of the abscissa x along the long side "a” may be a linear function to give this aperture a trapezoidal shape.
- the filter comprises to ensure electrical continuity along the small side "b" movable guide a sliding metal contact spring copper alloy.
- the filter may comprise to provide electrical continuity along the short side "b" movable guide a trap bringing a short circuit to sliding contact points "C" for a selected guided wavelength.
- the filter may comprise means for moving the partitions of the capacitive irises of the cavities parallel to the short side "b" of the waveguide to vary the opening "d" identically to the ends of each cavity and thus simultaneously change the value the overvoltage coefficient Q for all the cavities Ki.
- the filter may also comprise means making it possible to vary the opening "d" of the capacitive irises of the cavities when the narrow adjustable side "b" of the guide moves with the movable side II using one of the two ways described above. after:
- the movable partition associated with the movable conductor II side of the guide is moved mechanically parallel to itself by one or more rotary or linear motors or piezoelectric motors.
- FIG. 1 has an example of a cavity using an inductive obstacle septum according to the prior art
- FIG. 1 b the equivalent diagram of a waveguide cavity according to the prior art
- FIG. inductive iris used according to the prior art to limit such a cavity
- FIG. 2 a rectangular section waveguide bandpass filter composed of two conductive parts I and II,
- FIG. 3 the manner in which the two parts I and II of FIG. 2 are nested to form the waveguide filter
- FIG. 4 a sectional view of a transverse section of the waveguide
- FIG. 5 is a sectional view of a longitudinal section of the guide filter composed of a succession of resonant cavities and immitance reversers,
- FIG. 6a several examples of embodiments of capacitive irises
- FIG. 6b an example of an iris having a trapezoidal opening making it possible to maintain the bandwidth of the filter substantially constant when the central frequency of the filter varies with "a"
- FIGS. 7a, 7b and 7c several embodiments for making a contact providing electrical continuity between the two parts I and II, and
- FIG. 2 depicts a portion of a rectangular section waveguide pass filter which comprises, for example, the following elements:
- the partitions 105i and 105 2 define the cavity (K-) 106i of length L1 and the partitions 105 4 105 5 the cavity (K 2 ) 106 2 of length L2.
- the partition 105 3 with an aperture defining a capacitive-type iris which has an opening "i" ( Figure 5), and forms, with the two adjacent guide lengths L3 and L4, an immitance reverser J between the two cavities 106 1 and 106 2 ,
- the reference 107 corresponds to the outer movable partition of the waveguide G when the first fixed part I and the second movable part II are nested one inside the other.
- the two conductive parts I and II are nested as described in FIG. 3.
- the signal propagates between the inputs E and S of the waveguide G passing through the openings Oi of height "d" capacitive irises through cavities Ki thus formed by the transverse partitions and the walls of the guide and through the openings "i" of the walls whose particular function is to perform a function of inversion of immitance.
- the shape of the capacitive apertures and the dimension "d” or “i” of their opening under each transverse partition (iris) is determined to obtain the desired frequency response and selectivity for the filter (see FIG. 4).
- the side of the movable portion II of the waveguide which closes all the cavities, is manually or mechanically adjusted by means of a single adjustment to move the frequency filter in the desired band.
- the filter is therefore tuned throughout the band to be covered by this unique adjustment of the dimension of the "a" side.
- the moving conductive partition II of the guide can be moved mechanically parallel to itself by one or more rotary motors or linear or piezoelectric or other. Mechanical movement can be controlled by software. These displacement means are known to those skilled in the art and will not be represented for reasons of simplification.
- the guided wavelength "A g " of a signal at frequency f is equal to:
- a cavity has a length L close to "A g 72, and its Q load overvoltage coefficient is a function of the openings of the end irises (couplings jB) (ref. [2] ).
- the overvoltage coefficients (Q) of each resonator being determined the architecture or design of the filter is obtained by an association of resonators in series and parallel.
- the dimensions and shape of the capacitive irises of cavities having dimensions (opening "d") achievable are determined for example in the manner described below.
- the "design” is obtained by fixing overvoltage values Q of the cavities Ki which make it possible to have reasonable iris openings and by coupling the cavities by means of immitance inverters.
- These immitance inverters of value J must also use capacitive-type irises so that their value is independent of "a" when the short side of the guide "b" is moved.
- the design or architecture of the tunable filter according to the invention is obtained for example using methods known to those skilled in the art, as it is explained in [5] page 59 or in [6] page 559.
- the structure of a filter of order 4 is obtained by placing the four cavities (Ki) between the immitance reversers Ji:
- L-, and L 2 represent the lengths of the cavity portion K1 and K2, and J the inversion immitance portion
- the capacitive irises used may be thin or thick.
- the formulas that make it possible to calculate their respective equivalent schemes are known from the prior art, for example, [7] (pages 218-221 or 248-255 or 404-406 depending on their shape and their thickness).
- Capacitive irises may include one or more transverse conductive obstacles associated with one or more corresponding, complementary openings in the section of the guide.
- Figure 6a represents several possible embodiments of this type of iris.
- the conductive obstacle 51 associated with the two complementary openings 01 in the section of the waveguide forms such an iris.
- the conductive obstacles 52 and 53 associated with the complementary central opening 02 in the section of the guide constitute an iris of this type.
- the two conductive obstacles 55 and 56 associated with the three complementary openings 03 also form a capacitive iris.
- the transverse conductor obstacle 54 associated with its complementary opening 04 in the section of the guide is a capacitive iris similar to that shown in the guide of FIG. 4.
- the susceptance jB of the iris (jB 0 has the same value at the center frequency f 0 of the cavity whatever its value in the band to be covered when "a" varies),
- one solution consists in varying B 0 by changing the opening "d" of the capacitive irises of the cavities .
- One way is to make this iris mobile parallel to the short side of the guide while maintaining electrical contact with the fixed and movable parts forming the cavity.
- One possible adjustment is to move the iris partition parallel to the small side "b" of the waveguide to vary the opening "d" identically to the ends of each cavity and thus simultaneously change the value Q to all the cavities.
- the change of "d” in practice is small, of the order of a few tenths of a millimeter.
- the variation of the aperture "d" of the capacitive iris can be obtained when the narrow adjustable side "b" of the guide (partition 107) moves with the moving side II, for example, using one of two ways described below: • by a separate motorized control or not, and common to all cavities, • by pushing the irises of the cavities upwards to increase the value of "d” when the value "a" of the long side is decreased by a compensated device in the opposite direction, for example by a spring.
- the opening "d" has a slightly variable value along the dimension x of the large side "a".
- the small side of the guide associated with the movable conductive part II moves by increasing the value of "a”
- the apparent opening of the iris "d (x)" decreases, which makes it possible to slightly vary the coefficient of overvoltage Q to compensate for the variation of the bandwidth of the filter BW when f 0 varies.
- An approximate form of the opening is for example obtained from the calculation of "d (x)" at the two extreme points in frequency of the band to be covered by f 0 .
- This shape of the iris shown in FIG. 6b is then a rectangle trapezium whose large base 20 is on the wall "b" of the fixed part I of the guide, the smallest side 21 being on the opening side receiving mobile part II.
- the parasitic responses of the filter, close to the cut-off frequency of the guide which is a function of "a”, are suppressed, for example by putting in series with the tunable filter a suitable length of guide under the cut at these frequencies.
- the tunable filter according to the invention can use at least three types of sliding contacts C to ensure electrical continuity along the small moving side of the guide.
- the first possibility is to use a copper alloy spring metal part 30 fixed to the movable partition and providing a spring action to maintain the relative position of the movable partition and conductive walls (see Fig. 7a).
- the second uses a sliding contact to (see Figure 7b).
- the movable partition has one or more grooves along the movable partition in which conductive elastomeric seals 32 make it possible to maintain the ohmic contact.
- the third solution is to ensure the contact according to the trap technique used to ensure good electrical continuity at the junction between the guides (see ref. [3]). It consists in bringing back by means of a trap (33) a short circuit at the sliding contact points ("C") for a selected guided wavelength (see FIG. 7c).
- the trap consists of the complete cut schematized by hatching. This solution seems interesting taking into account that "A go " is constant in the guide when "a” varies, for any central frequency f 0 of the filter.
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0906258A FR2954596B1 (en) | 2009-12-22 | 2009-12-22 | MICRO-WAVE FILTER PASS BAND TUNABLE IN FREQUENCY |
PCT/EP2010/070145 WO2011076698A1 (en) | 2009-12-22 | 2010-12-17 | Frequency-tunable microwave bandpass filter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2517299A1 true EP2517299A1 (en) | 2012-10-31 |
EP2517299B1 EP2517299B1 (en) | 2018-11-07 |
Family
ID=42289129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10793260.0A Not-in-force EP2517299B1 (en) | 2009-12-22 | 2010-12-17 | Frequency-tunable microwave bandpass filter |
Country Status (6)
Country | Link |
---|---|
US (1) | US8975985B2 (en) |
EP (1) | EP2517299B1 (en) |
AU (1) | AU2010335206B2 (en) |
FR (1) | FR2954596B1 (en) |
MY (1) | MY167198A (en) |
WO (1) | WO2011076698A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9899716B1 (en) * | 2015-03-01 | 2018-02-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Waveguide E-plane filter |
KR102354111B1 (en) | 2015-05-21 | 2022-01-25 | 주식회사 케이엠더블유 | Waveguide filter |
GB2565574B (en) * | 2017-08-17 | 2022-01-19 | Creo Medical Ltd | Isolation device for electrosurgical apparatus |
US11189896B2 (en) | 2017-12-21 | 2021-11-30 | Gowrish Basavarajappa | Tunable bandpass filter with constant absolute bandwidth using single tuning element |
GB2572763B (en) | 2018-04-09 | 2022-03-16 | Univ Heriot Watt | Waveguide and antenna |
CN109713412B (en) * | 2018-12-20 | 2024-03-29 | 常州机电职业技术学院 | Tunable E-plane cutting H-plane waveguide band-pass filter and design method thereof |
US11031664B2 (en) | 2019-05-23 | 2021-06-08 | Com Dev Ltd. | Waveguide band-pass filter |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR993039A (en) * | 1944-11-14 | 1951-10-25 | Csf | filter element in an electromagnetic waveguide |
US2697209A (en) * | 1951-07-13 | 1954-12-14 | Itt | Tunable band pass filter |
US3577104A (en) * | 1968-12-26 | 1971-05-04 | Microwave Dev Lab Inc | Waveguide filter having sequence of thick capacitive irises |
US4301430A (en) * | 1980-09-12 | 1981-11-17 | Rca Corporation | U-Shaped iris design exhibiting capacitive reactance in heavily loaded rectangular waveguide |
US4761625A (en) * | 1986-06-20 | 1988-08-02 | Rca Corporation | Tunable waveguide bandpass filter |
US5808528A (en) | 1996-09-05 | 1998-09-15 | Digital Microwave Corporation | Broad-band tunable waveguide filter using etched septum discontinuities |
JP2005102046A (en) * | 2003-09-26 | 2005-04-14 | Nec Engineering Ltd | Band-pass filter |
-
2009
- 2009-12-22 FR FR0906258A patent/FR2954596B1/en not_active Expired - Fee Related
-
2010
- 2010-12-17 MY MYPI2012002883A patent/MY167198A/en unknown
- 2010-12-17 EP EP10793260.0A patent/EP2517299B1/en not_active Not-in-force
- 2010-12-17 WO PCT/EP2010/070145 patent/WO2011076698A1/en active Application Filing
- 2010-12-17 AU AU2010335206A patent/AU2010335206B2/en not_active Ceased
- 2010-12-17 US US13/518,380 patent/US8975985B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2011076698A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU2010335206B2 (en) | 2016-03-17 |
WO2011076698A1 (en) | 2011-06-30 |
US20130169384A1 (en) | 2013-07-04 |
US8975985B2 (en) | 2015-03-10 |
EP2517299B1 (en) | 2018-11-07 |
FR2954596A1 (en) | 2011-06-24 |
MY167198A (en) | 2018-08-13 |
AU2010335206A1 (en) | 2012-08-09 |
FR2954596B1 (en) | 2012-03-16 |
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