US 11,870,420 B2
Acoustic matrix diplexers and radios using acoustic matrix diplexers
Andrew Guyette, San Mateo, CA (US); and Neal Fenzi, Santa Barbara, CA (US)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Mar. 17, 2022, as Appl. No. 17/697,834.
Application 17/697,834 is a continuation of application No. 17/122,986, filed on Dec. 15, 2020, granted, now 11,309,865.
Application 17/122,986 is a continuation of application No. 17/121,724, filed on Dec. 14, 2020, granted, now 11,405,017.
Claims priority of provisional application 63/087,789, filed on Oct. 5, 2020.
Prior Publication US 2022/0209746 A1, Jun. 30, 2022
Int. Cl. H03H 9/205 (2006.01); H04B 1/00 (2006.01); H03H 9/54 (2006.01); H03H 9/70 (2006.01)
CPC H03H 9/205 (2013.01) [H03H 9/54 (2013.01); H03H 9/542 (2013.01); H03H 9/706 (2013.01); H04B 1/0057 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A multiplexer, comprising:
a first filter port, a second filter port, a third filter port and a fourth filter port;
a first sub-filter having a first sub-filter port connected to the first filter port and a second sub-filter port connected to the second filter port;
a second sub-filter having a first sub-filter port connected to the first filter port and a second sub-filter port connected to the third filter port;
a third sub-filter having a first sub-filter port connected to the first filter port and a second sub-filter port connected to the fourth filter port;
a first acoustic resonator connected between the first filter port and ground; and
a second acoustic resonator connected between the second filter port and ground,
wherein the first, second and third sub-filters have contiguous passbands, with a bandwidth of one of the first, second or third sub-filters being equal to a bandwidth of the multiplexer,
wherein the first and second acoustic resonators are transversely-excited film bulk acoustic resonators (XBARs) that are configured to create respective transmission zeros adjacent to a lower edge of the bandwidth of the multiplexer.