DUPLEXER AND MANUFACTURING METHOD THEREOF

PROBLEM TO BE SOLVED: To manufacture a duplexer which uses thin film piezoelectric resonators through a small number of processes. SOLUTION: The duplexer 1 includes a chip 10 having a transmission filter 97 for passing a transmission signal and cutting off a reception signal and a reception filter 9...

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Bibliographische Detailangaben
Hauptverfasser:	KOMURO EIKI, GUNJI KATSUHIKO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS RESONATORS TRANSMISSION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To manufacture a duplexer which uses thin film piezoelectric resonators through a small number of processes. SOLUTION: The duplexer 1 includes a chip 10 having a transmission filter 97 for passing a transmission signal and cutting off a reception signal and a reception filter 98 for passing a reception signal and cutting off a transmission signal. The transmission filter 97 and the reception filter 98 include thin-film piezoelectric resonators 16, 17 each having a piezoelectric thin film having piezoelectricity and two excitation electrodes arranged on both sides of the piezoelectric thin film for applying excitation voltage to the piezoelectric thin film. All the thin-film piezoelectric resonators 16, 17 included in the transmission filter 97 and the reception filter 98 are arranged on a single substrate. COPYRIGHT: (C)2004,JPO