Patent ID: 9099981
Filing Date: 2015-08-04
Classification: H03H

Abstract:
1. An acoustic wave device comprising: a piezoelectric substrate having an upper surface thereof; a comb-shaped electrode disposed on the upper surface of the piezoelectric substrate and arranged to excite an acoustic wave on the piezoelectric substrate, the acoustic wave device including an oscillation space above the comb-shaped electrode; a first wiring disposed on the upper surface of the piezoelectric substrate; an organic insulator covering at least a portion of the first wiring; a second wiring disposed on a first portion of an upper surface of the organic insulator; and an inorganic insulator covering at least a second portion of the upper surface of the organic insulator and an upper surface of the second wiring the second wiring and the organic insulator being arranged such that the second portion of the upper surface of the organic insulator and the upper surface of the second wiring face the oscillation space across the inorganic insulator, a thickness of the organic insulator being greater than a thickness of the inorganic insulator, and a dielectric constant of the organic insulator being lower than a dielectric constant of the inorganic insulator.