Patent ID: 11870416
Assignee: QXONIX, INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A bulk acoustic wave (BAW) resonator comprising:
a substrate;
first and second piezoelectric layers acoustically coupled with one another, in which the first piezoelectric layer has a first piezoelectric axis orientation, and the second piezoelectric layer has a second piezoelectric axis orientation that substantially opposes the first piezoelectric axis orientation of the first piezoelectric layer, and in which the first and second piezoelectric layers have respective thicknesses to facilitate a main resonant frequency of the bulk acoustic wave resonator; and
an acoustic reflector electrode including at least a first pair of metal electrode layers electrically and acoustically coupled with the first and second piezoelectric layers, the acoustic reflector electrode including at least a patterned layer, the patterned layer including at least a step mass feature acoustically coupled with the first and second piezoelectric layers.