US 11,901,876 B2
Acoustic matrix filters and radios using acoustic matrix filters
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 May 23, 2022, as Appl. No. 17/751,539.
Application 17/751,539 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 2022/0286109 A1, Sep. 8, 2022
This patent is subject to a terminal disclaimer.
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)] 18 Claims
OG exemplary drawing
 
1. A filter, comprising:
a first filter port and a second filter port;
n sub-filters, where n is an integer greater than one, each of the n sub-filters having a first sub-filter port connected to the first filter port and a second sub-filter port connected to the second filter port; and
at least one transversely-excited film bulk acoustic resonator (XBAR) connected between ground and at least one of the first and second filter ports and configured to create transmission zeros adjacent to a lower edge of a passband of the filter.