公开(公告)号：US20170194940A1

公开(公告)日：2017-07-06

申请号：US15265911

申请日：2016-09-15

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuji NURIKABE ,  Koichi UENO

IPC: H03H11/28 ,  H04B1/04 ,  H04L5/14 ,  H03H11/34 ,  H01Q1/50

CPC classification number: H03H11/28 ,  H01Q1/50 ,  H03H7/38 ,  H03H7/463 ,  H03H11/344 ,  H04B1/0057 ,  H04B1/04 ,  H04B1/0458 ,  H04B1/18 ,  H04L5/14

Abstract: A radio-frequency module includes duplexers and a phase circuit. A first transmitting-signal input terminal is connected to the duplexer, while a second transmitting-signal input terminal is connected to the duplexer. The phase circuit is connected between the first transmitting-signal input terminal and the duplexer. The phase circuit performs phase adjustment so that impedance matching between the first transmitting-signal input terminal and the duplexer is performed in the fundamental frequency band of a first transmitting signal, and so that the phase of the frequency band of a second transmitting signal in relation to the impedance characteristics of a first transmission path which ranges from the first transmitting-signal input terminal to the duplexer with the phase circuit provided therebetween appears in an open side on a Smith chart.

公开(公告)号：US20180123620A1

公开(公告)日：2018-05-03

申请号：US15857686

申请日：2017-12-29

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Koichi UENO

IPC: H04B1/00 ,  H03H11/34 ,  H04B1/18 ,  H04B1/48 ,  H03H7/38 ,  H03H7/46 ,  H04B1/525

CPC classification number: H04B1/0057 ,  H03H7/38 ,  H03H7/46 ,  H03H11/344 ,  H04B1/00 ,  H04B1/18 ,  H04B1/44 ,  H04B1/48 ,  H04B1/525

Abstract: A front-end module, which uses a carrier aggregation method in which communication is performed by simultaneously using Band 8 and Band 3, includes an antenna switch module that switches connections between an antenna and a plurality of signal paths, a first circuit that is connected to a Band 8 signal path, and a second circuit that is connected to a Band 3 signal path and is electromagnetic-field coupled with the first circuit. A signal including a Band 3 frequency component that propagates from the signal path to the signal path via the antenna switch module and a signal including a Band 3 frequency component that propagates from the signal path to the signal path via the first circuit and the second circuit have a phase-shifted relationship with each other.

公开(公告)号：US20170111078A1

公开(公告)日：2017-04-20

申请号：US15390880

申请日：2016-12-27

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Syuichi ONODERA ,  Koichi UENO ,  Naoya MATSUMOTO

IPC: H04B1/44 ,  H04M1/02 ,  H03H9/64

CPC classification number: H04B1/44 ,  H03H2/005 ,  H03H7/09 ,  H03H9/0566 ,  H03H9/46 ,  H03H9/64 ,  H03H9/6483 ,  H03H9/725 ,  H03H11/16 ,  H04B1/525 ,  H04M1/0202 ,  H04M1/0277

Abstract: An inductor that adjust characteristics of a transmit filter circuit is disposed so that the inductor and at least one of common paths, a matching circuit, a receive filter circuit, and receive paths connected to an output terminal of the transmit filter circuit define a propagation path due to magnetic-field coupling and/or electric-field coupling. This configuration does not require the addition of a circuit device to define the propagation path. It is thus possible to improve attenuation characteristics for an RF signal outside the frequency band of a transmitting signal and to improve isolation characteristics between a transmit filter circuit and a receive filter circuit without increasing the size of a radio-frequency module.