Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1996-08-30
1998-11-03
Ham, Seungsook
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333134, H01P 120, H01P 512
Patent
active
058314962
ABSTRACT:
A dielectric filter utilizing a plurality of serially coupled resonators having attenuation maximums at the lower side or higher side, or both, of a pass band frequency region. The filter may include an input element which is coupled with both of a first resonator and a second resonator, and may also include an output element which is coupled with both the last and the next-to-last resonator. In the dielectric filter, it is not necessary to provide an external wire connection to generate such attenuation maximums.
REFERENCES:
patent: 2795763 (1957-06-01), Tillotson
patent: 4249148 (1981-02-01), Jachowski
Ishikawa et al., "800 MHz High Power Duplexer . . . Resonators", 1992 IEEE MTT-S Digest, pp. 1617-1620, Jan. 6, 1992.
B. Yu. Kapilevich et al: "A Compact Microwave Filter Based on a Three-Mode Cutoff Waveguide-Dielectric Cavity" Telecommunications and Radio Engineering, vol. 41/42, No. 9, Sep. 1987, pp. 97-100.
Patent Abstracts of Japan, vol. 3, No. 40 (E-102), 6 Apr. 1979 & JP 54 018260 A (Nippon Denki K.K.), 10 Feb. 1979, abstract.
Patent Abstracts of Japan, vol. 17, No. 344 (E-1390), 29 Jun. 1993 & JP 05 048305 A (Murata Mfg. Co Ltd), 26 Feb. 1993, abstract.
Patent Abstracts of Japan, vol. 96, No. 4, 30 Apr. 1996 & JP 07 336102 A (Murata Mfg. Co Ltd), 22 Dec. 1995, abstract, figures 11, 14.
European Search Report dated Jan. 26, 1998.
Kobayashi Eiichi
Sonoda Tomiya
Ham Seungsook
Murata Manufacturing Co. Ltd.
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