US 12,136,912 B2
RF filter device
Alexandre Agusto Shirakawa, San Diego, CA (US); and Marcel Giesen, Munich (DE)
Assigned to RF360 Singapore Pte. Ltd., Singapore (SG)
Appl. No. 17/256,987
Filed by RF360 Singapore Pte. Ltd., Singapore (SG)
PCT Filed Jul. 1, 2019, PCT No. PCT/EP2019/067596
§ 371(c)(1), (2) Date Dec. 29, 2020,
PCT Pub. No. WO2020/015993, PCT Pub. Date Jan. 23, 2020.
Claims priority of application No. 102018117520.5 (DE), filed on Jul. 19, 2018.
Prior Publication US 2021/0143793 A1, May 13, 2021
Int. Cl. H03H 9/56 (2006.01); H03H 9/02 (2006.01); H03H 9/17 (2006.01); H03H 9/54 (2006.01)
CPC H03H 9/564 (2013.01) [H03H 9/02086 (2013.01); H03H 9/175 (2013.01); H03H 9/542 (2013.01); H03H 9/568 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An RF filter device, comprising;
a resonator structure comprising a bulk acoustic wave (BAW) resonator, the resonator structure comprising an active structure and an acoustic mirror, wherein the active structure comprises a bottom electrode, a top electrode, and a piezoelectric material between the bottom electrode and the top electrode; and
a further electric circuit comprising at least a capacitance element, wherein the acoustic mirror is arranged on one or more layers between layers including the active structure and layers including the further electric circuit, wherein the acoustic mirror is configured to establish an electromagnetic shield.