Patent ID: 9548438
Date: 2017-01-17
CPC Classifications: H01L,H03H

Claim:
1. An acoustic resonator structure, comprising: a piezoelectric layer having a first surface and a second surface; a first electrode disposed adjacent to the first surface, the first electrode comprising: a first conductive layer disposed adjacent to the piezoelectric layer and having a first acoustic impedance, and a second conductive layer disposed on a side of the first conductive layer opposite the piezoelectric layer and having a second acoustic impedance greater than the first acoustic impedance; and a second electrode disposed adjacent to the second surface, the second electrode comprising: a third conductive layer disposed adjacent to the piezoelectric layer and having a third acoustic impedance, and a fourth conductive layer disposed on a side of the third conductive layer opposite the piezoelectric layer and having a fourth acoustic impedance greater than the third acoustic impedance; wherein the first and third conductive layers are formed of a first material, and the second and fourth conductive layers are formed of a second material.