GB2006539A - Dual Evanescent Mode Waveguide Filter - Google Patents

Dual Evanescent Mode Waveguide Filter

Info

Publication number
GB2006539A
GB2006539A GB7831594A GB7831594A GB2006539A GB 2006539 A GB2006539 A GB 2006539A GB 7831594 A GB7831594 A GB 7831594A GB 7831594 A GB7831594 A GB 7831594A GB 2006539 A GB2006539 A GB 2006539A
Authority
GB
United Kingdom
Prior art keywords
dual
evanescent
waveguide filter
mode waveguide
evanescent mode
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.)
Withdrawn
Application number
GB7831594A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB7831594A priority Critical patent/GB2006539A/en
Publication of GB2006539A publication Critical patent/GB2006539A/en
Withdrawn legal-status Critical Current

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
    • 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

Abstract

A waveguide filter incorporates both dual mode operation, in which orthogonally plane polarised waves traverse the same filter cavity, and evanescent operation at a frequency below the cut-off frequency of the guide. The combination of dual-mode and evanescent-mode operation is achieved by the introduction of capacitive susceptance (11) balanced between the orthogonal modes. Different coupling coefficients, and therefore different transmission characteristics, for the two orthogonal modes are obtained by differential loading of the resonant cavities. This is achieved by differential inductive susceptances (13) having e.g. three posts extending in one orthogonal direction and two in the other. <IMAGE>
GB7831594A 1977-05-25 1978-07-28 Dual Evanescent Mode Waveguide Filter Withdrawn GB2006539A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7831594A GB2006539A (en) 1977-05-25 1978-07-28 Dual Evanescent Mode Waveguide Filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2205777 1977-05-25
GB7831594A GB2006539A (en) 1977-05-25 1978-07-28 Dual Evanescent Mode Waveguide Filter

Publications (1)

Publication Number Publication Date
GB2006539A true GB2006539A (en) 1979-05-02

Family

ID=26255689

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7831594A Withdrawn GB2006539A (en) 1977-05-25 1978-07-28 Dual Evanescent Mode Waveguide Filter

Country Status (1)

Country Link
GB (1) GB2006539A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2477783A1 (en) * 1980-03-04 1981-09-11 Thomson Csf VARIABLE CAPABILITY ADAPTER DEVICE AND TUNABLE HYPERFREQUENCY FILTER HAVING AT LEAST ONE SUCH DEVICE
US4291287A (en) * 1979-12-10 1981-09-22 Hughes Aircraft Company Evanescent mode filter
EP0143225A2 (en) * 1983-11-24 1985-06-05 ANT Nachrichtentechnik GmbH Microwave-balanced mixer
US4968957A (en) * 1989-05-31 1990-11-06 Hughes Aircraft Company Transmit and receive diplexer for circular polarization

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4291287A (en) * 1979-12-10 1981-09-22 Hughes Aircraft Company Evanescent mode filter
FR2477783A1 (en) * 1980-03-04 1981-09-11 Thomson Csf VARIABLE CAPABILITY ADAPTER DEVICE AND TUNABLE HYPERFREQUENCY FILTER HAVING AT LEAST ONE SUCH DEVICE
EP0035922B1 (en) * 1980-03-04 1984-06-20 Thomson-Csf Tuning device with variable capacity and tunable microwave filter with at least one such device
EP0143225A2 (en) * 1983-11-24 1985-06-05 ANT Nachrichtentechnik GmbH Microwave-balanced mixer
EP0143225A3 (en) * 1983-11-24 1987-08-19 Ant Nachrichtentechnik Gmbh Microwave-balanced mixer
US4968957A (en) * 1989-05-31 1990-11-06 Hughes Aircraft Company Transmit and receive diplexer for circular polarization

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)