Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-08-09
2005-08-09
Le, Dinh T. (Department: 2816)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S187000, C310S366000
Reexamination Certificate
active
06927651
ABSTRACT:
Acoustic resonator devices having multiple resonant frequencies and methods of making the same are described. In one aspect, an acoustic resonator device includes an acoustic resonant structure that includes first and second electrodes and first and second piezoelectric layers. The first and second electrodes abut opposite sides of a resonant volume free of any interposing electrodes. The first and second piezoelectric layers are disposed for acoustic vibrations in the resonant volume and have different respective acoustical resonance characteristics and respective piezoelectric axes oriented in different directions. The acoustic resonant structure has resonant electric responses at first and second resonant frequencies respectively determined at least in part by the acoustical resonance characteristics of the first and second piezoelectric layers.
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Larson, III John D.
Oshmyansky Yury
Agilent Technologie,s Inc.
Le Dinh T.
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