Patent ID: 8692631

Claim:
An acoustic wave resonator, comprising: (a) a substrate; (b) an acoustic mirror formed in or on the substrate, having a first edge and an opposite, second edge; (c) a dielectric layer formed on the substrate such that the dielectric layer is substantially in contact with the first and second edges of the acoustic mirror; (d) a first electrode formed on the acoustic mirror, having a first end portion and an opposite, second end portion defining a body portion therebetween, wherein the second end portion is formed extending to the dielectric layer, and wherein the first end portion of the first electrode locates between the first and second edges of the acoustic mirror; (e) a piezoelectric layer formed on the first electrode, having a body portion, a first end portion and a second end portion oppositely extending from the body portion onto the dielectric layer; and (f) a second electrode formed on the piezoelectric layer, having a first portion situated on the body portion of the piezoelectric layer, and a second portion extending from the first portion such that the junction of the first portion and the second portion locates between the first and second edges of the acoustic mirror, and the second portion of the second electrode and the first end portion of the piezoelectric layer define a gap therebetween, wherein the second portion of the second electrode comprises a convex bridge, wherein thicknesses of the piezoelectric layer at the first end portion that defines the gap and at the remaining portion are substantially the same.