US 12,407,373 B2
Acoustic wave filter circuit, multiplexer, front-end circuit, and communication apparatus
Atsushi Ono, Nagaokakyo (JP); and Hirotsugu Mori, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Feb. 27, 2023, as Appl. No. 18/174,677.
Application 18/174,677 is a continuation of application No. PCT/JP2021/024343, filed on Jun. 28, 2021.
Claims priority of application No. 2020-144705 (JP), filed on Aug. 28, 2020.
Prior Publication US 2023/0216536 A1, Jul. 6, 2023
Int. Cl. H04B 1/50 (2006.01); H03H 9/64 (2006.01); H03H 9/72 (2006.01); H04B 1/54 (2006.01)
CPC H04B 1/50 (2013.01) [H03H 9/64 (2013.01); H03H 9/72 (2013.01); H04B 1/54 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An acoustic wave filter circuit, wherein:
in a first band and a second band, the first band being used for frequency division duplex (FDD) communication and including a first downlink operating band and a first uplink operating band, the second band being used for FDD communication and including a second downlink operating band and a second uplink operating band,
(1) the first downlink operating band, the second downlink operating band, the first uplink operating band, and the second uplink operating band are positioned in order from lowest to highest frequency or from highest to lowest frequency or (2) the first downlink operating band, the first uplink operating band, the second uplink operating band, and the second downlink operating band are positioned in order from lowest to highest frequency or from highest to lowest frequency;
a frequency range of the first uplink operating band and a frequency range of the second uplink operating band do not overlap; and
the acoustic wave filter circuit is formed in or on a first substrate having piezoelectric properties and has a pass band including the first and second uplink operating bands.