Elastic wave device and filter and electronic equipment...

Details Elastic wave device and filter and electronic equipment... Elastic wave device and filter and electronic equipment...

2011-07-19

2011-07-19

Benson, Walt (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07982365

ABSTRACT:
The elastic wave device of the present invention has an piezoelectric substrate; a first dielectric layer disposed on the piezoelectric substrate; a second dielectric layer disposed on the first dielectric layer; and an acoustical layer on the second dielectric layer. Determining each film thickness of the first and the second dielectric layers provides advantageous effects. That is, energy of an SH wave as a main wave is confined in the boundary between the piezoelectric substrate and the first dielectric layer, and at the same time, an SV wave is suppressed as an unwanted wave. The device allows the SV wave—whose displacement distribution is similar to that of Stoneley wave—to have displacement distribution on the upper surface of the second dielectric layer and to be suppressed by the acoustical layer disposed on the second dielectric layer.

REFERENCES:
patent: 7692515 (2010-04-01), Hauser et al.
patent: 2006/0290233 (2006-12-01), Nishiyama et al.
patent: 2007/0210676 (2007-09-01), Matsuda et al.
patent: 2009/0115287 (2009-05-01), Kando
patent: 2009/0212659 (2009-08-01), Matsuda et al.
patent: 2005/069486 (2005-07-01), None

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