Contour-mode piezoelectric micromechanical resonators

Details Contour-mode piezoelectric micromechanical resonators Contour-mode piezoelectric micromechanical resonators

2005-06-02

2009-02-17

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S187000, C310S321000

Reexamination Certificate

active

07492241

ABSTRACT:
A contour mode micromechanical piezoelectric resonator. The resonator has a bottom electrode; a top electrode; and a piezoelectric layer disposed between the bottom electrode and the top electrode. The piezoelectric resonator has a planar surface with a cantilevered periphery, dimensioned to undergo in-plane lateral displacement at the periphery. The resonator also includes means for applying an alternating electric field across the thickness of the piezoelectric resonator. The electric field is configured to cause the resonator to have a contour mode in-plane lateral displacement that is substantially in the plane of the planar surface of the resonator, wherein the fundamental frequency for the displacement of the piezoelectric resonator is set in part lithographically by the planar dimension of the bottom electrode, the top electrode or the piezoelectric layer.

REFERENCES:
patent: 5648746 (1997-07-01), Kaida
patent: 6548943 (2003-04-01), Kaitila et al.
patent: 6909221 (2005-06-01), Ayazi et al.
patent: 2006/0090328 (2006-05-01), Kawashima
patent: 2006/0290449 (2006-12-01), Piazza et al.

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