Patent ID: 7786825
Filing Date: 2010-08-31
Classification: H03H

Abstract:
1. A bulk acoustic wave device, comprising: a first resonator and a second resonator, each of the first and second resonators comprising: a first electrode; a piezoelectric layer disposed over at least a portion of the first electrode; and a second electrode disposed over at least a portion of the piezoelectric layer, wherein the first and second resonators are acoustically coupled, and the first and second resonators are electrically connected in parallel; and a coupling layer disposed between the first resonator and the second resonator, the coupling layer comprising a plurality of layers of alternating high and low acoustic impedances for acoustically coupling the first and second resonators, wherein the first electrode of the first resonator and the second electrode of the second resonator are connected, and the second electrode of the first resonator and the first electrode of the second resonator are connected.