Wave transmission lines and networks – Coupling networks – Electromechanical filter
Patent
1998-09-22
2000-03-07
Pascal, Robert
Wave transmission lines and networks
Coupling networks
Electromechanical filter
333195, 310313B, H03H 964
Patent
active
060345772
ABSTRACT:
A surface acoustic wave filter having one or a plurality of filter functional units each comprising a series arm resonator and a parallel arm resonator. Each of the series arm resonator and the parallel arm resonator is constituted by an interdigital transducer and grating reflectors formed on a piezoelectric substrate composed of 64.degree.-rotated Y-cut X-propagating LiNbO.sub.3. The series arm resonator is constructed by electrically connecting a one-port resonator in series with a signal line, and the parallel arm resonator is constructed by electrically connecting a one-port resonator in parallel with the signal line. In the interdigital transducer in the series arm resonator and/or the parallel arm resonator, one or more sets of electrode fingers continuously adjacent to each other are formed.
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Hirao Yasuhiro
Kobayashi Yasumi
Matsui Kuniyuki
Shibata Kenichi
Takeuchi Kousuke
Pascal Robert
Sanyo Electric Co,. Ltd.
Summons Barbara
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