Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-03-15
2005-03-15
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S133000, C310S312000, C029S025350
Reexamination Certificate
active
06867667
ABSTRACT:
A piezoelectric filter includes a plurality of piezoelectric resonator portions each having a substrate, an SiO2layer, a piezoelectric thin-film, a lower electrode, and an upper electrode. The plurality of piezoelectric resonator portions include piezoelectric resonator portions having a relatively low frequency, and the lower electrodes of the piezoelectric resonator portions having a relatively low frequency have a thickness larger than that of lower electrodes of other piezoelectric resonator portions. A ladder-type piezoelectric filter, which is one of the communication devices, includes a plurality of parallel resonators and series resonators.
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Kawamura Hideki
Takeuchi Masaki
Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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