Matsushita Electric Industrial Co., Ltd.

Kazuki Nishimura

Shigeru Tsuzuki

Ken Matsunami

Tsutomu Igaki

A saw device comprises input/output interdigital transducer (IDT) electrodes( ) provided on piezoelectric substrates ( ), a first reflector electrode ( ) following the input IDT electrode ( ), and a second reflector electrode ( ) preceding the output IDT electrode ( ). The device satisfies the following inequality ( ) to provide preferable characteristics in a pass band: 2(&thgr;&minus;5)&lE;tan (D/L)&lE;2(&thgr;&plus;5) where &thgr;: the inclination (in degree, except zero) of the first or second reflector electrode of the input and output IDT electrodes with respect to a plane perpendicular to the direction in which surface acoustic waves travel. D: the pitch (in micron) of the input and output IDT electrodes in the direction in which surface acoustic waves travel. L: the pitch (in micron) of the first and second reflector electrodes.

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Kyoto, Japan

Kazuki Nishimura