Patent ID: 11929726
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The multiplexer according to claim 1, wherein
the first acoustic wave filter, the second acoustic wave filter, and the third acoustic wave filter are each provided on a substrate having piezoelectricity;
the first acoustic wave filter, the second acoustic wave filter, and the third acoustic wave filter are each defined by an acoustic wave resonator that includes an interdigital transducer (IDT) electrode;
the substrate includes a support substrate, a piezoelectric layer that has a surface on which the IDT electrode is provided, and an energy confinement layer that is positioned between the support substrate and the piezoelectric layer and that is able to confine acoustic wave energy; and
the energy confinement layer includes a plurality of layers through which a bulk wave propagates at different acoustic velocities or a plurality of layers that have different acoustic impedances.