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:
Mar. 08, 2022
Filed:
Nov. 05, 2019
Murata Manufacturing Co., Ltd., Nagaokakyo, JP;
Yuichi Takamine, Nagaokakyo, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A filter circuit has a first frequency band as a pass band and a second frequency band as an attenuation band. The filter circuit includes a 90-degree hybrid coupler, a first filter that is connected to the 90-degree hybrid coupler and has the first frequency band as a pass band, and a second filter that is connected to the 90-degree hybrid coupler and has the second frequency band as a pass band. The second filter includes a first inductor, a resonant circuit, and a second inductor connected in series in this order, a first capacitive element connected between a node on a signal path connecting the first inductor and the resonant circuit and a ground electrode, and a second capacitive element connected between a node on a signal path connecting the second inductor and the resonant circuit and a ground electrode.