Dual mode multistage filter

Details Dual mode multistage filter Dual mode multistage filter

1995-09-27

1997-03-25

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333219, H01P 1203, H01P 708

Patent

active

056148763

ABSTRACT:
A strip dual mode filter consists of a strip line ring resonator having an electric length equivalent to a resonance wavelength .lambda..sub.o for resonating microwaves at the resonance wavelength .lambda..sub.o according to a characteristic impedance thereof, an input coupling capacitor for transmitting the microwaves from an input terminal to a coupling point A of the ring resonator, an output coupling capacitor for outputting the microwaves resonated in the ring resonator from a coupling point B of the ring resonator to an output terminal, and a phase-shifting circuit connected to a coupling point C and a coupling point D of the ring resonator for changing the characteristic impedance of the ring resonator by shifting a phase of the microwave by a multiple of a half-wave length of the microwaves. The coupling point B is spaced a quarter-wave length of the microwaves apart from the coupling point A, the coupling point C is spaced the half-wave length of the microwaves apart from the coupling point A, and the coupling point D is spaced the half-wave length of the microwaves apart from the coupling point B.

REFERENCES:
patent: 3796970 (1974-03-01), Snell, Jr.
patent: 4327342 (1982-04-01), De Ronde
patent: 4488131 (1984-12-01), Griffin et al.
patent: 5172084 (1992-12-01), Fiediuszko et al.
20th European Microwave Conference, 10-13 Sep. 1990, Budapest (HU) pp. 901-906, XP000327023, M. Guglielmi et al.: "Experimental investigation of dual-model microstrip ring resonators".
Electronics Letters, vol. 8, No. 12, 15 Jun. 1972, Stevenage GB, pp. 301-302, XP002012122, J. Wested et al.: "Resonance Splitting in Nonuniform Ring Resonators".
1990 IEEE MTT-S International Microwave Symposium-Digest, vol. 1; May 8-10, 1990 Dallas, US; IEEE, New York, US, 1990; X.H. Jiao et al.: "Microwave frequency agile active filters for MIC and MMIC applications", pp. 503-506.
IRE Transactions on Microwave Theory and Techniques, vol. 9, No. 7, Jul. 1961, New York, US; pp. 359-360; J.A. Kaiser "Ring network filter".
"Miniature Dual Mode Microstrip Filers" by J.A. Curtis et al.; 1991 IEEE MTT-S Digest pp. 443-446 no month.

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