ELASTIC WAVE FILTER, DUPLEXER, AND ELASTIC WAVE FILTER MODULE

ELASTIC WAVE FILTER, DUPLEXER, AND ELASTIC WAVE FILTER MODULE

An elastic wave filter includes a piezoelectric substrate, an IDT electrode provided on the piezoelectric substrate, a first shield electrode provided on the piezoelectric substrate, a first insulating film laminated on the piezoelectric substrate and extending onto the first shield electrode, a fir...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: MURANAKA, Hiroshi
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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Beschreibung
Zusammenfassung:An elastic wave filter includes a piezoelectric substrate, an IDT electrode provided on the piezoelectric substrate, a first shield electrode provided on the piezoelectric substrate, a first insulating film laminated on the piezoelectric substrate and extending onto the first shield electrode, a first signal terminal provided on the first insulating film, a second signal terminal provided on the piezoelectric substrate, and a first ground terminal provided on the piezoelectric substrate and connected to a ground potential. The first shield electrode is not electrically connected to the IDT electrode and the first and second signal terminals. The first signal terminal is included in the first shield electrode when seen from above. One of the first signal terminal and the second signal terminal is an output terminal and the other thereof is an input terminal.