Patent ID: 6762471
Filing Date: 2004-07-13
Classification: H03H

Abstract:
A thin film resonator for filtering frequencies of a predetermined band, which comprises:a supporting means having a plurality of posts formed on a substrate and a supporting layer formed on said posts, wherein said supporting layer is composed of a non-piezoelectric material, wherein said posts are formed on said substrate so that said supporting layer is supported at positions proximate to its periphery by said posts, and wherein a plurality of openings are formed through said supporting layer; a first electrode formed on said supporting means; a dielectric layer composed of a piezoelectric material formed on said first electrode; a second electrode formed on said dielectric layer; and a connecting means for connecting said second electrode to a circuit formed on said substrate, wherein a first air gap is interposed between said substrate and said supporting means and a second air gap is interposed between said second electrode and said connecting means.