Patent ID: 8018303
Filing Date: 2011-09-13
Classification: H03H

Abstract:
1. An apparatus, comprising: a first bulk acoustic wave device; a second bulk acoustic wave device; a first system port provided by a serial or a parallel connection of first ports of the first and second bulk acoustic wave devices; and a second system port provided by a serial or a parallel connection of second ports of the first and second bulk acoustic wave devices, wherein the first bulk acoustic wave device and the second bulk acoustic wave device each respectively comprise: a first resonator comprising a first electrode, a first piezoelectric layer disposed at least partially on the first electrode, a second electrode disposed at least partially on the first piezoelectric layer; a first stack crystal filter comprising a third electrode, a second piezoelectric layer disposed at least partially on the third electrode, a fourth electrode disposed at least partially on the second piezoelectric layer, a third piezoelectric layer disposed at least partially on the fourth electrode, a fifth electrode disposed at least partially on the third piezoelectric layer; a coupling layer structure disposed between the first resonator and the first stack crystal filter; a first port comprising a first terminal and a second terminal; and a second port comprising a first terminal and a second terminal, wherein the first electrode is coupled to the first terminal of the first port, and the second electrode is coupled to the second terminal of the first port, and wherein the fourth electrode is coupled to the first terminal of the second port, and the third electrode and the fifth electrode are coupled to the second terminal of the second port.