Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2007-03-02
2009-10-06
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C310S312000, C333S189000
Reexamination Certificate
active
07598826
ABSTRACT:
There is provided a piezoelectric thin film device with its frequency impedance characteristic unsusceptible to spuriousness.A film bulk acoustic resonator has a configuration where an adhesive layer, a lower electrode, a piezoelectric thin film, and an upper electrode are laminated in this order on a support substrate. A drive section of the upper electrode and a drive section of the lower electrode are opposed to each other with the piezoelectric thin film interposed therebetween. The respective drive section has a slender two-dimensional shape, with magnitude in its longitudinal direction being not less than twice, more desirably four times, and further desirably ten times, as large as magnitude in its widthwise direction.
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Osugi Yukihisa
Sakai Masahiro
Tai Tomoyoshi
Yamaguchi Shoichiro
Burr & Brown
NGK Insulators Ltd.
Summons Barbara
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