Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2006-03-07
2006-03-07
Callahan, Timothy P. (Department: 2816)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C310S31300R, C310S31300R, C310S360000
Reexamination Certificate
active
07009468
ABSTRACT:
A small, high-performance SAW device has a large electromechanical coupling coefficient and a small number of fingers constituting reflectors, and is constructed such that losses due to electric resistance of the fingers. In the SAW device having pluralities of first fingers and second fingers, disposed on a quartz substrate, constituting an IDT for exciting SH waves and reflectors for reflecting the SH waves, respectively, the first and second fingers made mainly from Au are disposed on the ST-cut 90° X-propagation quartz substrate with the Euler angles (0°, θ, 90°±2°), wherein the angle θ is within the range of about 110° to about 150° and a normalized film thickness (H/λ) of the fingers is within the range of about 0.003 to about 0.095.
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Fujimoto Koji
Kadota Michio
Nakao Takeshi
Callahan Timothy P.
Keating & Bennett LLP
Luu An T.
Murata Manufacturing Co. Ltd.
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