Dual-mode cavity filter

Details Dual-mode cavity filter Dual-mode cavity filter

1996-12-18

1998-08-11

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333212, H01P 1208

Patent

active

057932719

ABSTRACT:
Comprising one or more resonant cavities in which are produced two resonant modes at two different frequencies f.sub.1 and f.sub.2, both modes having essentially the same field distributions but rotated 90.degree. with respect to each other. Each cavity comprises a tuning element (TS.sub.a) for tuning the resonant frequency f.sub.1 of the first mode along a first axis, a tuning element (TS.sub.b) for tuning the resonant frequency f.sub.2 of the second mode along a second axis perpendicular to the first, input coupling means (IC) and output coupling means (OC) for injecting into and extracting from the cavity, respectively, a radiofrequency signal along axes not parallel to those of resonance. Filter tuning is done by using only two tuning elements, which means that the filter cost is lower and the tuning time is reduced.

REFERENCES:
patent: 2890421 (1959-06-01), Currie
patent: 4513264 (1985-04-01), Dorey et al.
patent: 4544901 (1985-10-01), Rhodes et al.
patent: 5349316 (1994-09-01), Sterns
"Realization of Dual-Mode Longitudinal Filters with Arbitrary Polarization of Input and Output Ports", p. 253, 1986 IEEE-MIT-S International Microwave Symposium-Digest, 2-4 Jun. 1986, Baltimore (US), pp. 253-256 by J. Frenna. JP 57 155802 A (Nippon Denki K.K.), 27 Sep. 1982.
Journees Nationales Microondes (JNM), Nice, Jun. 22-24, 1987, No. vol. 5, 22, Jun. 1987, Givelet J. "Conception de Filtres Microondes A Cavites Bimodes Ayant Une Reponse En Amplitude Dissymetrique", pp. 44-45, 46.
"A Full-Wave Analysis of Tuning and Coupling Posts in Dual-Mode Circular Waveguide Filters" J. Montejo-Garai, et al, Microwave and Optical Tech. pp. 505-507, vol. 7 Aug. 11, 1994.

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