Surface acoustic wave device and communication apparatus

Details Surface acoustic wave device and communication apparatus Surface acoustic wave device and communication apparatus

2005-05-31

2005-05-31

Dougherty, Thomas M. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

06900577

ABSTRACT:
A plurality of surface acoustic wave filters having different center frequencies is provided on a piezoelectric substrate. Either input terminals or output terminals, or both input terminals and output terminals of the surface acoustic wave filters are integrated. Of the surface acoustic wave filters, a surface acoustic wave filter having a higher center frequency is configured so as to suppress a spurious response in the proximity of the high-frequency side in or outside a passband in the filter characteristics of a surface acoustic wave filter having a lower center frequency, for example, such that the width or pitch of electrode fingers in at least one region of reflectors differs from that in other regions.

REFERENCES:
patent: 5831493 (1998-11-01), Ushiroku
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patent: 6265808 (2001-07-01), Taniguchi
patent: 6462632 (2002-10-01), Fujii et al.
patent: 6472959 (2002-10-01), Beaudin et al.
patent: 6700460 (2004-03-01), Takamine
patent: A 2001-326557 (2001-11-01), None
patent: 2001-326557 (2001-11-01), None

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