Acoustic wave device and electronic equipment using the same

Details Acoustic wave device and electronic equipment using the same Acoustic wave device and electronic equipment using the same

2009-09-02

2011-12-27

Dougherty, Thomas M (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R, C310S340000

Reexamination Certificate

active

08084916

ABSTRACT:
An acoustic wave device has: a piezoelectric body; an interdigital electrode that is arranged on the piezoelectric body and excites an acoustic wave; and a dielectric layer that is arranged on the piezoelectric body so as to cover the interdigital electrode. The dielectric layer includes a composition changing portion made up of a medium where propagation velocity of a transverse wave continuously increases upward. With this configuration, it is possible to shift a spurious radiation by a high-order mode that propagates inside the dielectric layer to a higher frequency, so as to reduce an influence of the spurious radiation by the high-order mode.

REFERENCES:
patent: 4204178 (1980-05-01), Mitchell
patent: 5010270 (1991-04-01), Greer
patent: 6013221 (2000-01-01), Byer et al.
patent: 2008/0179989 (2008-07-01), Ogami et al.
patent: 2007/046236 (2007-04-01), None

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