Patent ID: 8810108

Claim:
A bulk-acoustic-wave resonator, comprising: an acoustic reflector; a substantially c-axis oriented hexagonal crystal structure solidly-mounted to the acoustic reflector; and a plurality of electrodes positioned about the hexagonal crystal structure, wherein the bulk-acoustic-wave resonator is resonating in at least two non-harmonically-related operational modes, wherein the plurality of electrodes comprise: a signal electrode positioned on a surface of the acoustic reflector, such that at least a portion of the signal electrode is substantially between at least a portion of the acoustic reflector and at least a portion of the hexagonal crystal structure; a first ground electrode positioned on the surface of the acoustic reflector, such that at least a portion of the first ground electrode is substantially between at least a second portion of the acoustic reflector and at least a second portion of the hexagonal crystal structure; and a second ground electrode positioned on the surface of the acoustic reflector, such that at least a portion of the second ground electrode is substantially between at least a third portion of the acoustic reflector and at least a third portion of the hexagonal crystal structure.