Patent ID: 7075391
Filing Date: 2006-07-11
Classification: H01L,H03H

Abstract:
1. A surface acoustic wave filter comprising: a piezoelectric substrate; an insulation film formed on a main surface of said piezoelectric substrate, a surface acoustic wave filter element formed on said main surface of said piezoelectric substrate or formed above said insulation film, and a first wiring electrode and a second wiring electrode which are electrically connected to said surface acoustic wave filter element, wherein 1) either said first wiring electrode is formed on said main surface and said second wiring electrode is formed above said insulation film or 2) said second wiring electrode is formed on said main surface and said first wiring electrode is formed above said insulation film, said first wiring electrode and said second wiring electrode intersect in an area of the surface acoustic wave filter where the first wiring electrode is formed in a perpendicular direction relative to the second wiring electrode, and at least a part of said insulation film is disposed between said first wiring electrode and said second wiring electrode in said area.