Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2011-07-26
2011-07-26
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S188000, C333S189000, C310S322000, C310S366000
Reexamination Certificate
active
07986198
ABSTRACT:
An acoustic thin film resonator including: a first piezoelectric thin film101; a pair of primary electrodes103and104for applying an electric signal, which are formed on the first piezoelectric thin film; a second piezoelectric thin film102that is disposed so that an oscillation generated in the first piezoelectric thin film propagates to the second piezoelectric thin film; a pair of secondary electrodes104and105for outputting an electric signal, which are formed on the second piezoelectric thin film; a load108that is connected between the secondary electrodes; and a control portion109that controls a value of the load. Thereby, an acoustic thin film resonator element is formed so that an electric signal inputted from the primary electrodes is outputted from the secondary electrodes by a piezoelectric effect, and a resonant frequency and an antiresonant frequency are made variable through the control of the value of the load. A resonant frequency and an antiresonant frequency are made variable at the same time without resonant characteristics being deteriorated.
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Nakatsuka Hiroshi
Onishi Keiji
Yamakawa Takehiko
Hamre Schumann Mueller & Larson P.C.
Panasonic Corporation
Summons Barbara
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