Patent ID: 9083302
Filing Date: 2015-07-14
Classification: H03H

Abstract:
1. A bulk acoustic wave (BAW) resonator, comprising: a first layer comprising a plurality of sub-layers, wherein a cavity exists in the first layer, the cavity having a perimeter bordering an active region of the BAW resonator; a distributed Bragg reflector (DBR) bordering the cavity and comprising: the plurality of sub-layers, wherein each of the sub-layers has a thickness substantially equal to an odd multiple of the quarter wavelength of the fundamental eigenmode of the BAW resonator; and a second layer disposed beneath the first layer and the cavity; a first electrode disposed over the cavity; a first piezoelectric layer disposed over the first electrode; a second electrode disposed over the first piezoelectric layer; a second piezoelectric layer disposed over the second electrode; a third electrode disposed over the second piezoelectric layer; and a bridge disposed between the first electrode and the third electrode.