US 12,456,965 B2
Acoustic filters providing negative capacitance for use in multiplexers
Nadim Khlat, Cugnaux (FR)
Assigned to Qorvo US, Inc., Greensboro, NC (US)
Appl. No. 18/251,249
Filed by Qorvo US, Inc., Greensboro, NC (US)
PCT Filed Sep. 23, 2021, PCT No. PCT/US2021/051675
§ 371(c)(1), (2) Date May 1, 2023,
PCT Pub. No. WO2022/103492, PCT Pub. Date May 19, 2022.
Claims priority of provisional application 63/112,817, filed on Nov. 12, 2020.
Prior Publication US 2023/0412149 A1, Dec. 21, 2023
Int. Cl. H03H 9/70 (2006.01); H03H 9/205 (2006.01); H03H 9/54 (2006.01); H03H 9/60 (2006.01)
CPC H03H 9/706 (2013.01) [H03H 9/205 (2013.01); H03H 9/542 (2013.01); H03H 9/605 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A multiplexer comprising:
an input;
a first acoustic filter comprising:
a first resonator element comprising:
a first terminal electrically coupled to the input; and
a second terminal, wherein the first resonator element is configured to pass a first frequency to the second terminal; and
a second resonator element comprising:
a first sub-resonator element having a first polarity, the first sub-resonator element having a seventh terminal electrically coupled to the first terminal; and
a second sub-resonator element having a second polarity opposite the first polarity, the second sub-resonator element mechanically coupled to the first sub-resonator element with a third terminal therebetween; and
a second acoustic filter comprising:
a third resonator element comprising:
a fourth terminal electrically coupled to the input; and
a fifth terminal, wherein the second resonator element is configured to cancel signal leakage at the first frequency at the fifth terminal; and
a fourth resonator element comprising
a third sub-resonator element having the first polarity, the third sub-resonator element having an eighth terminal electrically coupled to the fourth terminal; and
a fourth sub-resonator element having the second polarity, the fourth sub-resonator element mechanically coupled to the third sub-resonator with a sixth terminal therebetween;
wherein the fourth sub-resonator element is electrically coupled to the second terminal through a ninth terminal and the second sub-resonator element is electrically coupled to the fifth terminal through a tenth terminal.