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.:
Date of Patent:
Nov. 04, 2025
Filed:
Sep. 07, 2023
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Norihiko Nakahashi, Nagaokakyo, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A multiplexer includes a first filter connected between a common terminal and an input/output terminal and having a pass band including a first frequency band, a second filter connected between the common terminal and an input/output terminal and having a pass band including a second frequency band higher than the first frequency band, and an additional circuit connected in parallel to a path connecting the common terminal and the input/output terminal. The additional circuit includes a longitudinally coupled resonator including IDT electrodes. If a peak frequency in an IDT response occurring in a bandpass characteristic of the additional circuit is f1, and if a frequency corresponding to a lowest impedance among frequencies higher than the second frequency band in an impedance characteristic viewing the multiplexer from the common terminal is f2, f2×(1−0.0012)≤f1≤f2×(1+0.0012) is satisfied.