Patent ID: 9013250
Filing Date: 2015-04-21
Classification: H03H

Abstract:
1. An acoustic wave device comprising: a substrate; a piezoelectric film formed on the substrate; a lower electrode provided on a first surface of the piezoelectric film; an upper electrode provided on a second surface of the piezoelectric film opposite to the first surface; and a mass loading film having a first pattern and a second pattern in a resonance portion in which the lower electrode and the upper electrode face each other through the piezoelectric film, the first pattern having portions and the second pattern having portions interlinking the portions of the first pattern, wherein the portions of the second pattern have a width smaller than that of the portions of the first pattern, wherein the first pattern and the second pattern in the resonance portion are defined by a single pattern, and a complementary pattern of the first pattern and the second pattern in the resonance portion are defined by a single pattern.