Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1996-04-19
1999-03-02
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333193, 310313D, H03H 964
Patent
active
058776621
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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Hirao Yasuhiro
Kayaki Hiroshi
Kiyose Isao
Kobayashi Yasumi
Matsui Kuniyuki
Pascal Robert
Sanyo Electric Co,. Ltd.
Summons Barbara
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