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. 13, 2018
Filed:
Mar. 20, 2017
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Takao Mukai, Nagaokakyo, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A branching device that separates signals of different pass bands increases attenuation characteristics outside the pass bands, and increases isolation characteristics. The branching device includes a duplexer including a transmission filter and a reception filter electrically connected to an antenna terminal, and a filter electrically connected to the antenna terminal. An inductor is electrically connected between the antenna terminal and a ground potential. The transmission filter is a ladder filter including serial arm resonators and parallel arm resonators, and each includes a polarized inductor electrically connected between the parallel arm resonators and a ground potential. The inductor and the polarized inductors inductively couple with each other, and a distance between the inductor and the polarized inductors is shorter than a distance between the polarized inductors.