Patent ID: 11863151
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A multiplexer, comprising:
a common terminal, a first input/output terminal, and a second input/output terminal through which radio-frequency signals are input or output;
a first filter circuit including a first terminal connected to the common terminal and a second terminal connected to the first input/output terminal, the first filter circuit being a filter including a pass band that is a first frequency band;
a second filter circuit including a third terminal connected to the common terminal and a fourth terminal connected to the second input/output terminal, the second filter circuit being a filter including a pass band that is a second frequency band different from the first frequency band; and
an additional circuit connected between the fourth terminal and one of the first and second terminals; wherein
the additional circuit includes:
a series-arm circuit on a series-arm path providing a connection between the fourth terminal and the one of the first and second terminals; and
a parallel-arm circuit on a parallel-arm path providing a connection between the series-arm path and ground; and

the parallel-arm circuit includes:
only an inductor in series with the parallel-arm path;
only a capacitor in series with the parallel-arm path; or
only an LC parallel resonant circuit that is in series with the parallel-arm path and that includes an inductor and a capacitor connected in parallel.