Patent ID: 6362018
Filing Date: 2002-03-26
Classification: H01G,H01H

Abstract:
A method for fabricating a micro electro-mechanical system device, comprising the steps of:providing a substrate; depositing a first electrically conductive layer on an upper surface of the substrate to form a lower plate of a first driver capacitor; forming an isolation layer of non-conductive material over the lower plate of the first driver capacitor; depositing a second electrically conductive layer on an upper surface of the isolation layer to form a lower plate of a MEMS variable capacitor and a dual-use electrode; forming a sacrificial layer over the second electrically conductive layer; forming at least one anchor post coupled to the substrate; forming a dielectric membrane over the sacrificial layer and coupled to the at least one anchor post; depositing a third electrically conductive layer on an upper surface of the dielectric membrane to form an upper plate of the variable capacitor and an upper electrode of a second driver capacitor, wherein the first driver capacitor is in series with the second driver capacitor; removing the sacrificial layer so that the dielectric membrane is free to displace vertically in response to an actuation voltage applied to the first driver capacitor and the second driver capacitor.