Patent ID: 7689390
Filing Date: 2010-03-30
Classification: H01G,H03H

Abstract:
1. A method of modeling electrostrictive effects and acoustic resonances in a tunable capacitor, comprising: dividing a BST layer of said tunable capacitor into thin layers or slices with each slice's thickness representing a small fraction of an acoustic wavelength; injecting at each junction between said slices, an acoustic current proportional to an electrical current through said tunable capacitor; adjusting empirically characteristic impedances and complex propagation constants to account for actual process variations in manufacturing of said tunable capacitor; adjusting empirically said characteristic impedances and complex propagation constants to account for end-effects in directions transversal to a wave direction; and wherein a real part of a vector sum of acoustic voltages at all slice junctions, divided by an electrical current vector is taken to be representative of a part of the voltage tunable capacitor's effective series resistance contributed by an electrostrictive effect and acoustic resonances.