Patent ID: 7889024
Filing Date: 2011-02-15
Classification: H03H

Abstract:
1. A single cavity acoustic resonator, comprising: a first electrode; a second electrode; a third electrode disposed between the first electrode and the second electrode wherein the first and second electrodes comprise a substantially identical thickness, and the third electrode comprises a thickness that is approximately twice as great as the thickness of the first and second electrodes; a first piezoelectric layer disposed between the third electrode and the first electrode, and comprising a first C-axis having an orientation; and a second piezoelectric layer disposed between the third electrode and the second electrode, and comprising a second C-axis having an orientation parallel to the first C-axis, wherein application of a time varying electrical signal at a drive frequency to either the third electrode or to the first and second electrodes results in a resonance of the single cavity acoustic resonator at approximately twice a fundamental resonant frequency and a substantial cancellation of substantially all even-order mixing products in the single cavity resonator.