Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2006-11-21
2006-11-21
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C310S31300R, C310S31300R
Reexamination Certificate
active
07138890
ABSTRACT:
A SAW resonator includes an IDT electrode formed on a piezoelectric substrate and reflector electrodes disposed on both sides of the IDT electrode. The IDT electrode includes first finger-electrodes, second finger-electrodes and strip-line electrodes. The first and the second finger-electrodes do not overlap with each other but are acoustically coupled together by the strip-line electrodes. This acoustic coupling by the strip-line electrodes eliminates the need for a common bus-bar electrode, so that the loss caused by the resistance of the common bus-bar electrode can be reduced, and the SAW resonator can be downsized.
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Nakamura Hiroyuki
Nishimura Kazunori
Sakuragawa Toru
Seki Shun-ichi
Summons Barbara
Wenderoth , Lind & Ponack, L.L.P.
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