Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1996-04-22
1997-09-02
Lee, Benny
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333193, 310313B, 310313D, H03H 964
Patent
active
056636970
ABSTRACT:
A surface acoustic wave filter according to the present invention is constructed by connecting in series one or two or more filter functional units each comprising a first surface acoustic wave resonator having input and output terminals connected in series with a signal line and a second surface acoustic wave resonator having input and output terminals one of which is connected to the signal line and the other of which is grounded. The first surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically open strip type grating reflectors with the interdigital transducer interposed therebetween, and the second surface acoustic wave resonator is constituted by one interdigital transducer and a pair of electrically short strip type grating reflectors with the interdigital transducer interposed therebetween.
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German Office Action w/Translation.
"Some Studies on SAW Resonators and Multiple-Mode Filters", Y. Suzuki et al., Faculty of Engineering, Tohoku University, Sendai, Japan, 1976 Ultrasonics Symposium Proceedings, IEEE Cat. #76 CH1120-5SU, pp. 297-302.
Hirao Yasuhiro
Kayaki Hiroshi
Kiyose Isao
Kobayashi Yasumi
Matsui Kuniyuki
Gambino Darius
Lee Benny
Sanyo Electric Co,. Ltd.
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