EP0112328B1 - Strucutre de filtre a micro-ondes - Google Patents

Strucutre de filtre a micro-ondes Download PDF

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Publication number
EP0112328B1
EP0112328B1 EP82901958A EP82901958A EP0112328B1 EP 0112328 B1 EP0112328 B1 EP 0112328B1 EP 82901958 A EP82901958 A EP 82901958A EP 82901958 A EP82901958 A EP 82901958A EP 0112328 B1 EP0112328 B1 EP 0112328B1
Authority
EP
European Patent Office
Prior art keywords
cavity
coupling
iris
resonance
tuning screws
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.)
Expired
Application number
EP82901958A
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German (de)
English (en)
French (fr)
Other versions
EP0112328A1 (fr
Inventor
John David Rhodes
Richard John Cameron
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Agence Spatiale Europeenne
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Agence Spatiale Europeenne
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Filing date
Publication date
Application filed by Agence Spatiale Europeenne filed Critical Agence Spatiale Europeenne
Publication of EP0112328A1 publication Critical patent/EP0112328A1/fr
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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
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • H01P1/2082—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with multimode resonators

Definitions

  • the present invention relates to the production of microwave bandpass filters using dual-resonance cavities arranged so as to achieve asymmetrical transmission characteristics.
  • Microwave bandpass filters are widely used in terrestrial or space telecommunications systems for rejection of noise or interference signals and in multiplexers for combining or separating different transmission channels. The majority of these filters however have symmetrical transmission characteristics and are produced by microwave structures tuned synchronously, that is to say in which all the resonators are tuned to the same central frequency.
  • a known type of microwave filter structure comprises a cascade of cylindrical cavities with double resonance mode, in which each cavity is provided with two tuning screws arranged at 90 ° relative to each other and a coupling screw placed at 45 ° relative to the two tuning screws for coupling the two resonance modes of the cavity and in which the coupling between the identical resonance modes of the adjacent cavities is carried out by means of an iris of cross coupling drilled in a plate separating the adjacent cavities in the plane of a section of the cavities.
  • An exemplary structure of this type is described in FR-A-2 100 640.
  • the two slots of the coupling iris are oriented symmetrically so as to coincide with the orthogonal vectors which define the two modes of propagation in the corresponding cavities and the internal coupling screw of a cavity is arranged at 90 ° relative to the coupling screw of the adjacent cavity. This results in a 180 ° phase shift between the vertical resonance mode of the first cavity and the vertical resonance mode of the second cavity, which produces an elliptical transmission characteristic, therefore a symmetrical transmission characteristic.
  • FR-A-1 151 803 it is also known that the coupling between the cavities can be varied by using coupling slots having selected angles of inclination.
  • the transmission characteristic of the filter retains symmetry with respect to a central frequency.
  • the invention relates to a microwave filter using cavities with double resonance mode arranged so as to achieve asymmetrical transmission characteristics.
  • FIG. 4 there is an exploded view of a known embodiment.
  • the two cylindrical cavities 100 and 200 are separated by a plate 300 pierced with a cross coupling iris 400.
  • Each cavity supports two resonances in TE 11 mode polarized orthogonally to one another, each resonance being tuned individually by means of a tuning screw.
  • the two orthogonal resonances are coupled by means of a coupling screw placed at 45 ° relative to the tuning screws.
  • the coupling between the resonances in the adjacent cavities 100 and 200 is done by the coupling iris 400.
  • This type of construction achieves only transmission characteristics symmetrical with respect to the central frequency because this construction derives from a prototype network essentially symmetrical as shown in Figure 2.
  • This prototype network is a network in the form of a folded ladder to allow coupling between non-adjacent capacitors. These couplings are identified by the symbols K18, K27, K38.
  • Such a network is the electrical realization of the characteristics defined in mathematical form by transfer polynomials. The process for converting these polynomials into a prototype electrical network is described by JD Rhodes in: A low-pass prototype network for microwave linear phase filters (IEEE-MTT, Vol. MTT-18, June 1970, pages 145-160).
  • the references 100 and 200 designate two cylindrical cavities separated by a coupling iris plate 300 pierced with a cross iris 400. Each cavity supports two resonances in TE 11 mode orthogonally polarized. one in relation to the other, each resonance being tuned individually by means of a tuning screw.
  • the tuning screws are noted 1 and 2. The angular position of these screws 1 and 2 will serve as a reference position for the organization of the structure according to the invention.
  • the coupling iris plate 300 is arranged in such a way that the coupling iris 400 is angularly offset by an angle 9 relative to the angular position of the tuning screws 1 and 2 of the cavity 100. Then, the second cavity 200 is arranged in such a way that the angular position of its tuning screws 3 and 4 is offset by an angle ⁇ relative to the angular position of the coupling iris 400.
  • the angular offset between the angular positions of the screw of the two adjacent cavities is therefore ( ⁇ + ⁇ ).
  • each cavity of this structure there are two independent resonances tuned by the tuning screws and the coupling of these two resonances is adjusted by a coupling screw located at 45 ° relative to the tuning screws.
  • the coupling M 12 between the resonances 1 and 2 is adjusted by the screw 500 and in the cavity 200 the coupling M 34 between the resonances 3 and 4 is adjusted by the screw 600.
  • a simplified embodiment for 4th and 6th degree structures is to use a simple slit as an iris instead of a cross-shaped iris.
  • equations (I) are reduced to the following set:
  • the method for establishing the structure of a microwave filter with cavities with double resonance mode comprises two steps.
  • the first consists, from the prototype electrical network corresponding to the desired transfer function, to convert the prototype network into a coupling matrix.
  • the second step consists in transforming this matrix until it contains only couplings which can be produced by a cascade of cavities with double resonance mode and their coupling components.
  • This process is developed in the following articles: "A novel realization for microwave bandpass filters” by RJ Cameron (ESA JOURNAL, vol. 3, No. 4,1979, pp. 281-287) and “Asymmetric realization for dual-mode bandpass filters "by RJ Cameron and JD Rhodes (IEEE Trans. MTT, Vol. MTT-29, No. 1, Jan. 1981, pp. 51-58).
  • An exemplary embodiment of the 4th degree was constructed with a slit iris.
  • the bandwidth of this filter is 80 MHz with a center frequency of 14125 MHz.
  • the characteristics of theoretical loss, adaptation loss and group delay are shown in Figs. 6 to 8.
  • the second cavity is arranged so that the resonance tuning screw 3 is offset by an angle of 44.76 ° in the opposite direction to that of the movement of the needles of a watch with respect to the angular orientation of the coupling slot M i .
  • the input M 01 and output M 40 coupling slots are aligned with the angular positions of the resonance tuning screws 1 and 4 respectively: their lengths are calculated in the conventional way by the theory of termination impedances.

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EP82901958A 1982-06-11 1982-06-11 Strucutre de filtre a micro-ondes Expired EP0112328B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BE1982/000015 WO1983004457A1 (fr) 1982-06-11 1982-06-11 Structure de filtre a micro-ondes

Publications (2)

Publication Number Publication Date
EP0112328A1 EP0112328A1 (fr) 1984-07-04
EP0112328B1 true EP0112328B1 (fr) 1987-11-19

Family

ID=3881448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82901958A Expired EP0112328B1 (fr) 1982-06-11 1982-06-11 Strucutre de filtre a micro-ondes

Country Status (4)

Country Link
US (1) US4544901A (enrdf_load_stackoverflow)
EP (1) EP0112328B1 (enrdf_load_stackoverflow)
JP (1) JPS59501141A (enrdf_load_stackoverflow)
WO (1) WO1983004457A1 (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4628538A (en) * 1985-05-13 1986-12-09 Andrew Corporation Television transmission system using overmoded waveguide
IT1266852B1 (it) * 1994-06-08 1997-01-21 Cselt Centro Studi Lab Telecom Cavita' bimodale per filtri passa banda in guida d'onda.
GB9525543D0 (en) * 1995-12-14 1996-02-14 Central Research Lab Ltd A single mode resonant cavity
ES2109184B1 (es) * 1995-12-29 1998-07-01 Alcatel Espacio Sa Filtro de cavidades bimodo.
US5804534A (en) * 1996-04-19 1998-09-08 University Of Maryland High performance dual mode microwave filter with cavity and conducting or superconducting loading element
US6356171B2 (en) * 1999-03-27 2002-03-12 Space Systems/Loral, Inc. Planar general response dual-mode cavity filter
US6337610B1 (en) * 1999-11-22 2002-01-08 Comsat Corporation Asymmetric response bandpass filter having resonators with minimum couplings
US6459346B1 (en) * 2000-08-29 2002-10-01 Com Dev Limited Side-coupled microwave filter with circumferentially-spaced irises

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541375A (en) * 1948-06-04 1951-02-13 Bell Telephone Labor Inc Wave filter
US2738469A (en) * 1950-08-11 1956-03-13 Rca Corp Microwave filter
GB799163A (en) * 1955-06-24 1958-08-06 Marconi Wireless Telegraph Co Improvements in or relating to band frequency selective wave guide filters for use on very high frequencies
US2968771A (en) * 1957-12-31 1961-01-17 Bell Telephone Labor Inc Step-twist junction waveguide filter
US3235822A (en) * 1963-05-06 1966-02-15 Bell Telephone Labor Inc Direct-coupled step-twist junction waveguide filter
US3697898A (en) * 1970-05-08 1972-10-10 Communications Satellite Corp Plural cavity bandpass waveguide filter
DE2557809B2 (de) * 1975-12-22 1977-10-13 Siemens AG, 1000 Berlin und 8000 München H tief 111-zweikreisbandfilter mit daempfungspol ober - oder unterhalb des durchlassbereiches
US4028651A (en) * 1976-05-06 1977-06-07 Hughes Aircraft Company Coupled-cavity microwave filter
US4030051A (en) * 1976-07-06 1977-06-14 Hughes Aircraft Company N-section microwave resonator having rotary joint for variable coupling

Also Published As

Publication number Publication date
WO1983004457A1 (fr) 1983-12-22
US4544901A (en) 1985-10-01
EP0112328A1 (fr) 1984-07-04
JPS59501141A (ja) 1984-06-28
JPH034122B2 (enrdf_load_stackoverflow) 1991-01-22

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