Duplexer and method of manufacturing same

Details Duplexer and method of manufacturing same Duplexer and method of manufacturing same

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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