Piezoelectric resonator and piezoelectric thin-film filter

Details Piezoelectric resonator and piezoelectric thin-film filter Piezoelectric resonator and piezoelectric thin-film filter

2007-10-12

2009-12-22

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S167000, C310S334000, C310S367000

Reexamination Certificate

active

07636027

ABSTRACT:
A piezoelectric resonator and a piezoelectric thin-film filter including the piezoelectric resonator. The piezoelectric resonator includes a piezoelectric layer disposed between a pair of conductive layers to form a vibrating region. Outer edges of the vibrating region each have a waveform. The vibrating region includes a peripheral portion extending along the outer edges of the planar shape and having a relatively small thickness; and a central portion extending inside the peripheral portion and having a relatively large thickness. The piezoelectric resonator is thus capable of suppressing long-wavelength spurious modes and short-wavelength spurious modes.

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Machine translation of Nishimura et al. JP 2002-374144 published Dec. 26, 2002.
PCT/JP2006/310308 Written Opinion dated Aug. 29, 2006.
PCT/JP2006/310308 International Search Report dated Aug. 29 2006.

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