Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-07-05
2005-07-05
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C310S31300R
Reexamination Certificate
active
06914498
ABSTRACT:
A surface acoustic wave device has a significantly improved frequency temperature characteristic due to the arrangement of a SiO2film on an IDT such that cracking in the SiO2film surface is prevented from occurring, desired characteristics are reliably achieved, the electromechanical coupling coefficients is increased, and the attenuation constant α is reduced. In the surface acoustic wave device, at least one IDT primarily including Ag is arranged on a 20° to 60°-rotated Y plate LiTaO3substrate, and the SiO2film is arranged on the LiTaO3substrate while covering the IDT.
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Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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