Patent ID: 6534900
Filing Date: 2003-03-18
Classification: H03H

Abstract:
A thin film piezoresonator, comprising:a first electrode layer; a second electrode layer; a third electrode layer; a piezo layer disposed between said first and second electrode layers; an electroactive layer disposed between said second and third electrode layers; said second and third electrode layers and said electroactive layer defining a layer stack, a layer plane, and a vertical direction along a line substantially perpendicular to said layer plane; said electroactive layer being formed of a material contracting said electroactive layer in said vertical direction when a D.C. voltage is applied between said second electrode layer and said third electrode layer to change a resonance frequency of said layer stack for tuning the piezoresonator; and a series of layers formed alternately of a material of low acoustic impedance and a material of high acoustic impedance, said piezo layer and said electroactive layer disposed on said series of layers.