Patent ID: 11870420
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. 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, and
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 an upper edge of the bandwidth of the multiplexer.