Strip dual mode filter in which a resonance width of a microwave

Details Strip dual mode filter in which a resonance width of a microwave Strip dual mode filter in which a resonance width of a microwave

1995-09-27

1997-08-19

Lee, Benny

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333219, H01P 1203, H01P 708

Patent

active

056592744

ABSTRACT:
A strip dual mode filter includes a strip line ring resonator having a uniform line impedance and an electric length equivalent to a wavelength of a microwave, an input terminal coupled to a point A of the ring resonator, a feed-back circuit connected to points C and D and arranged in a central hollow space of the ring resonator and an output terminal coupled to a point B of the ring resonator. The points A to D are spaced by a quarter-wave length of the microwave in that order. The microwave input to the point A is resonated in the ring resonator in a first mode and is input to the feed-back circuit from the point C. Therefore, a phase of the microwave shifts by a multiple of a half-wave length of the microwave, and the microwave is output to the point D. Thereafter, the microwave is resonated in the ring resonator in a second mode orthogonal to the first mode and is output from the point B to the output terminal. Therefore, the microwave can be resonated and filtered in two orthogonal modes in the strip dual mode filter.

REFERENCES:
patent: 4112395 (1978-09-01), Seward
patent: 4327342 (1982-04-01), De Ronde
patent: 4488131 (1984-12-01), Griffin et al.
patent: 5172084 (1992-12-01), Fiediuszko
patent: 5313662 (1994-05-01), Ooi et al.
patent: 5369383 (1994-11-01), Takahashi et al.
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 Filters" by J.A. Curtis et al.; 1991 IEEE MTT-S Digest pp. 443-446.

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