Patent ID: 9525397
Filing Date: 2016-12-20
CPC Classification: H03H

Claim Text:
1. A solidly mounted resonator (SMR) device, comprising: an acoustic reflector disposed on a substrate, the acoustic reflector comprising a plurality of stacked acoustic reflector layer pairs, each acoustic reflector layer pair comprising a low acoustic impedance layer formed of low acoustic impedance material stacked on a high acoustic impedance layer formed of high acoustic impedance material; a bottom electrode disposed on the low acoustic impedance layer of a top acoustic impedance layer pair of the acoustic reflector; a piezoelectric layer disposed on the bottom electrode; a top electrode disposed on the piezoelectric layer; a collar formed outside a main active region defined by an overlap between the top electrode, the piezoelectric layer and the bottom electrode, the collar having an inner edge substantially aligned with a boundary of or overlapping the main active region; and at least one frame disposed within the main active region and having an outer edge substantially aligned with the boundary of the main active region, wherein the collar defines a collar region having a cutoff frequency that is substantially the same as a cutoff frequency of the main active region, and wherein the collar is formed on a top surface of the top electrode and a planarization layer adjacent the top electrode or on a top surface of the bottom electrode between the bottom electrode and the piezoelectric layer.