Patent ID: 6249074
Filing Date: 2001-06-19
Classification: H03H

Abstract:
A piezoelectric resonator, comprising:a piezoelectric plate having an upper and a lower opposing surfaces;electrodes disposed on the upper and lower surfaces of the plate, the electrodes being substantially opposing;a sacrificial mass-loading layer disposed on a portion of the electrodes wherein the sacrificial mass-loading layer causes the piezoelectric resonator to resonate at a preliminary frequency that is lower than a final desired frequency, and wherein material removed from the sacrificial mass-loading layer tunes the piezoelectric resonator to the final desired frequency such that the resonator behaves nearly the same as if having the substantially opposing electrodes without the sacrificial mass-loading layer; anda diffusion barrier interposed between the electrodes and the sacrificial mass-loading layer, the diffusion barrier being selected from one of the group of chrome, an oxide of chrome, and an oxide of aluminum.