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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11336261 B1

PDFFull Text
Date of Patent:
May. 17, 2022

Filed:

Jan. 22, 2021

Multiplexer, high-frequency front end circuit, and communication device

Applicant:

Murata Manufacturing Co., Ltd., Kyoto, JP;

Inventor:

Koji Nosaka, Kyoto, JP;

Assignee:

MURATA MANUFACTURING CO., LTD., Kyoto, JP;

Attorney:

Pearne & Gordon LLP

Primary Examiner:

Tuan Pham

Int. Cl.
CPC ...
H04B 1/40 (2015.01); H03H 9/72 (2006.01); H03H 9/64 (2006.01); H03H 9/05 (2006.01); H03H 9/145 (2006.01); H03H 9/25 (2006.01); H03F 3/19 (2006.01); H03H 9/00 (2006.01); H03H 9/02 (2006.01);
U.S. Cl.
CPC ...
H03H 9/72 (2013.01); H03F 3/19 (2013.01); H03H 9/0009 (2013.01); H03H 9/02559 (2013.01); H03H 9/02866 (2013.01); H03H 9/059 (2013.01); H03H 9/0542 (2013.01); H03H 9/0557 (2013.01); H03H 9/0561 (2013.01); H03H 9/0576 (2013.01); H03H 9/145 (2013.01); H03H 9/25 (2013.01); H03H 9/6436 (2013.01); H03H 9/6483 (2013.01); H03H 9/6489 (2013.01); H03H 9/725 (2013.01); H04B 1/40 (2013.01); H03F 2200/111 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01);
Abstract

A multiplexer () includes a plurality of filters connected to a common terminal (). The multiplexer () includes: a low-frequency filter (L) that is formed of at least one surface acoustic wave resonator arranged between the common terminal () and the input/output terminal () and has a first pass band; a high-frequency filter (H) that is connected between the common terminal () and the input/output terminal () and has a second pass band located at a higher frequency than the first pass band; and a capacitor (C) that is serially arranged in a connection path between the common terminal () and the low-frequency filter (L). The Q value of the capacitor (C) in the second pass band is higher than the Q value in the second pass band of a capacitance obtained by treating the at least one surface acoustic wave resonator of the low-frequency filter (L) as a capacitance.

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