US 11,996,825 B2
Filter using lithium niobate and rotated lithium tantalate transversely-excited film bulk acoustic resonators
Andrew Guyette, San Mateo, CA (US); Neal Fenzi, Santa Barbara, CA (US); and Bryant Garcia, Burlingame, CA (US)
Assigned to Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Dec. 24, 2020, as Appl. No. 17/133,857.
Application 17/133,857 is a continuation in part of application No. 17/070,694, filed on Oct. 14, 2020, granted, now 11,329,628.
Claims priority of provisional application 63/088,344, filed on Oct. 6, 2020.
Claims priority of provisional application 63/040,440, filed on Jun. 17, 2020.
Prior Publication US 2021/0399717 A1, Dec. 23, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H03H 9/56 (2006.01); H03H 3/02 (2006.01); H03H 9/02 (2006.01); H03H 9/17 (2006.01)
CPC H03H 9/562 (2013.01) [H03H 3/02 (2013.01); H03H 9/02031 (2013.01); H03H 9/02228 (2013.01); H03H 9/174 (2013.01); H03H 9/176 (2013.01); H03H 9/564 (2013.01); H03H 9/568 (2013.01); H03H 2003/023 (2013.01)] 20 Claims
OG exemplary drawing
 
9. A bandpass filter having a passband between a lower band edge and an upper band edge, comprising:
a circuit card;
a first chip mounted on and connected to the circuit card, the first chip comprising one or more lithium tantalate (LT) transversely-excited film bulk acoustic resonators (XBARs), each of the one or more LT XBARs comprising an LT layer with Euler angles (0°, β, 0°), where β is greater than zero and less than or equal to 40 degrees; and
a second chip mounted on and connected to the circuit card, the second chip comprising one or more lithium niobate (LN) XBARs, wherein
the one or more LT XBARs and the one or more LN XBARs are connected to form a ladder filter circuit.