Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1997-01-31
1998-02-10
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333188, 310348, H03H 900
Patent
active
057173664
ABSTRACT:
A ladder-type electric filter device having rubber plates each provided on one or both sides of each of the piezoelectric resonators so as to be brought into resilient contact with the surface of the associated piezoelectric resonator. The rubber plates are shaped so as to not be brought into contact with the respective corner edges of the respective piezoelectric resonators which generate extensive contour vibrations. Thus, the contour vibrations are not suppressed, the insertion loss can be reduced, and a mechanical quality factor Q can be substantially decreased, thereby improving group delay frequency characteristics.
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patent: 4360754 (1982-11-01), Toyoshima et al.
patent: 4398162 (1983-08-01), Nagai
patent: 4492892 (1985-01-01), Nakutani
patent: 4896069 (1990-01-01), Rosenberg et al.
patent: 5057802 (1991-10-01), Ozeki et al.
patent: 5130680 (1992-07-01), Nagai et al.
"High Impedance Piezoelectric Ceramic Resonators and Thier Application to Ladder Filters" Electronics and Communications in Japan by Hiromichi Jumonji, vol. 33-A No. 8 1970, pp. 17-23.
Kawakami Kenji
Ozeki Eiji
Gambino Darius
NGK Spark Plug Co. Ltd.
Pascal Robert
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