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:
Jul. 14, 2020
Filed:
Mar. 14, 2019
Murata Manufacturing Co., Ltd., Kyoto, JP;
Kei Matsutani, Kyoto, JP;
Koji Nosaka, Kyoto, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A radio frequency front-end circuit includes a first filter that is a frequency variable filter connected to a first select terminal of a switching circuit, and a second filter connected to a second select terminal of the switching circuit. The switching circuit includes a first switch that switches over conduction and non-conduction between a common terminal and the second select terminal. The first filter includes a serial arm resonance circuit connected to the first select terminal, a parallel arm resonator, and a frequency varying circuit. The frequency varying circuit includes a capacitor and a third switch connected in parallel to each other, and is connected in series to the parallel arm resonator. The frequency varying circuit shifts a frequency of the first filter depending on conduction and non-conduction of the third switch.