Plane type strip-line filter in which strip line is shortened an

Details Plane type strip-line filter in which strip line is shortened an Plane type strip-line filter in which strip line is shortened an

1994-10-04

1996-07-09

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333219, H01P 1203, H01P 708

Patent

active

055348319

ABSTRACT:
A strip-line filter is provided with upper- and lower-stage resonators having the same electromagnetic characteristics. Each of the resonators has a one-wavelength square-shaped strip line and four open-end transmission lines connected to four coupling points A,C,B and D (or E,G,F and H) of each resonator which are spaced 90 degrees in electric length in that order. The square-shaped strip lines have a pair of parallel coupling lines closely placed in parallel to each other to electromagnetically couple the resonators. Therefore, the filter can be manufactured in a small size. A first microwave resonated in each resonator is electromagnetically influenced by two open-end transmission lines connected to two coupling points A and B (or E and F), and a second microwave resonated in each resonator is electromagnetically influenced by two open-end transmission lines connected to two coupling points C and D (or G and H). Therefore, resonance wavelengths of the microwaves can be longer than a line length of each square-shaped strip line. Also, the resonance wavelengths can be adjusted by trimming the transmission lines. Also, because all constitutional elements are made of strip lines, the filter can be made plane.

REFERENCES:
patent: 4180787 (1979-12-01), Pfitzenmaier
patent: 4327342 (1982-04-01), De Ronde
patent: 5017897 (1991-05-01), Ooi et al.
IEEE PROCEEDINGS, H. MICROWAVES, ANTENNAS & PROPAGATION, vol. 138, No. 4, Aug. 1991, STEVENAGE GB, pp. 383-385, S. H. AL-CHARCHAFCHI et al., "Study of varactor tuned microstrip rhombic resonators".
"MINIATURE DUAL MODE MICROSTRIP FILTERS" by Curtis et al; 1991 IEEE MTT-S Digest; pp., 443-446.
"EXCITATION METHODS OF ORTHOGONAL RESONANT MODES FOR THE STRIPLINE RING RESONATOR AND THEIR APPLICATION TO FILTERING DEVICES" by M. Fujimura et al; The Institute of Electronics Information and Communication Engineers; Technical Report of IEICE. MW92-115(1992-12); pp., 15-22.
20TH EUROPEAN MICROWAVE CONFERENCE-PROCEEDINGS 10-13 Sep. 1990, Budapest, HU, MICROWAVE EXHIBITIONS AND PUBLISHERS LTD., Tunbridge Wells, GB, 1990; pp. 901-906, M. GUGLIELMI et al.: "Experimental investigation of dual-mode Microstrip ring resonators".

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