Patent ID: 8810104
Filing Date: 2014-08-19
Classification: H03H,Y10T

Abstract:
1. An acoustic wave device comprising: a piezoelectric substrate including a first main surface and a second main surface; at least one interdigital transducer electrode provided on the first main surface of the piezoelectric substrate; and an insulator layer to improve a temperature characteristic arranged on the piezoelectric substrate so as to cover the interdigital transducer electrode; wherein a wavelength of an acoustic wave is λ, when a surface of the insulator layer is classified into a first surface region under which the interdigital transducer electrode is located and a second surface region under which no interdigital transducer electrode is located, a height of a surface of the insulator layer in at least one portion of the second surface region is greater than a height of the surface of the insulator layer from the piezoelectric substrate in at least one portion of the first surface region by greater than 0.01λ to about 0.03λ.