Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2006-07-18
2006-07-18
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S189000, C310S312000
Reexamination Certificate
active
07078984
ABSTRACT:
A duplexer (1) comprises a chip (10) including a transmission filter (97) for passing a transmission signal therethrough and interrupting a reception signal and a reception filter (98) for passing a reception signal therethrough and interrupting a transmission signal. Each of the transmission filter (97) and the reception filter (98) includes thin-film piezoelectric resonators (16and17) each of which has a piezoelectric thin film that exhibits a piezoelectric property and two excitation electrodes that are disposed on both surfaces of the piezoelectric thin film and apply an excitation voltage to the piezoelectric thin film. All of the thin-film piezoelectric resonators (16and17) that the transmission filter (97) and the reception filter (98) include are disposed on a single base.
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Gunji Katsuhiko
Komuro Eiju
Summons Barbara
TDK Corporation
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