Surface acoustic wave device including an IDT defined by a...

Details Surface acoustic wave device including an IDT defined by a... Surface acoustic wave device including an IDT defined by a...

2011-01-25

2011-01-25

SanMartin, J. (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S31300R

Reexamination Certificate

active

07876021

ABSTRACT:
A surface acoustic wave device includes a LiTaO3substrate, and an IDT having a high reflection coefficient, which has a relatively high electromechanical coupling coefficient k2, and which can obtain superior resonance characteristics and/or filter characteristics. In a surface acoustic wave device in which a plurality of grooves is provided in an upper surface of a LiTaO3substrate and an IDT having a plurality of electrode fingers made of a metal filled in the plurality of grooves, the following equation is satisfied:(ρ3×C44)1/2>1.95×1011, where ρ represents the density of the metal defining the IDT, and C44represents the stiffness thereof.

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Machine translation of JP 2006-270906A (Oct. 2006).
Official Communication issued in International Patent Application No. PCT/JP2008/058041, mailed on Aug. 12, 2008.

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