Patent ID: 9735755
Date: 2017-08-15
CPC Classifications: H03H

Claim:
1. A Bulk Acoustic Wave (BAW) resonator, comprising: a piezoelectric layer; a first electrode on a first surface of the piezoelectric layer; a second electrode on a second surface of the piezoelectric layer opposite the first electrode on the first surface of the piezoelectric layer; a passivation layer on a surface of the second electrode opposite the piezoelectric layer within an active region of the BAW resonator, the passivation layer having a thickness (T one or more material layers on the second surface of the piezoelectric layer adjacent to the second electrode in an outer region of the BAW resonator, the outer region of the BAW resonator being a region outside of the active region of the BAW resonator and the one or more material layers having a thickness that is n times the thickness (T