US 12,438,521 B2
Acoustic wave device and composite filter device
Ryo Nakagawa, Nagaokakyo (JP); Haruki Kyouya, Nagaokakyo (JP); and Hiroshi Shimizu, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Sep. 6, 2022, as Appl. No. 17/903,296.
Application 17/903,296 is a continuation of application No. PCT/JP2021/009028, filed on Mar. 8, 2021.
Claims priority of application No. 2020-047272 (JP), filed on Mar. 18, 2020.
Prior Publication US 2022/0416764 A1, Dec. 29, 2022
Int. Cl. H03H 9/56 (2006.01); H03H 9/02 (2006.01); H03H 9/13 (2006.01); H03H 9/70 (2006.01)
CPC H03H 9/568 (2013.01) [H03H 9/02007 (2013.01); H03H 9/13 (2013.01); H03H 9/703 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An acoustic wave device comprising:
a piezoelectric layer;
an IDT electrode laminated on the piezoelectric layer and defining a first resonator; and
an IDT electrode laminated on the piezoelectric layer and defining a second resonator; wherein
the first resonator and the second resonator are connected in parallel or in series;
the IDT electrode of the first resonator includes an electrode layer including an epitaxial film and the IDT electrode of the second resonator includes an electrode layer including a non-epitaxial film; and
the first resonator and the second resonator are a plurality of divided resonators provided by dividing one resonator so as to have an equivalent impedance to an impedance before being divided.