US 11,916,539 B2
Split-ladder band N77 filter using transversely-excited film bulk acoustic resonators
Doug Jachowski, Santa Cruz, CA (US); Ventsislav Yantchev, Sofia (BG); Bryant Garcia, Burlingame, CA (US); and Patrick Turner, San Bruno, CA (US)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Mar. 1, 2021, as Appl. No. 17/189,246.
Claims priority of provisional application 62/983,403, filed on Feb. 28, 2020.
Prior Publication US 2021/0273631 A1, Sep. 2, 2021
Int. Cl. H03H 9/56 (2006.01); H03H 3/02 (2006.01); H03H 9/02 (2006.01); H03H 9/13 (2006.01); H03H 9/17 (2006.01)
CPC H03H 9/568 (2013.01) [H03H 3/02 (2013.01); H03H 9/02031 (2013.01); H03H 9/02228 (2013.01); H03H 9/132 (2013.01); H03H 9/174 (2013.01); H03H 9/176 (2013.01); H03H 2003/023 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A band N77 bandpass filter comprising:
a first plurality of transversely-excited film bulk acoustic resonators (XBARs) on a first chip comprising a first rotated YX-cut lithium niobate piezoelectric plate having a thickness less than or equal to 535 nm;
a second plurality of XBARs on a second chip comprising a second rotated YX-cut lithium niobate piezoelectric plate having a thickness greater than or equal to 556 nm; and
a circuit card coupled to the first chip and the second chip, the circuit card comprising conductors for making electrical connections between the first chip and the second chip.