公开(公告)号：US20180115038A1

公开(公告)日：2018-04-26

申请号：US15850339

申请日：2017-12-21

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuki NAKAIKE

IPC: H01P1/383

CPC classification number: H01P1/383

Abstract: Provided is a non-reciprocal circuit element that suppresses, as much as possible, a reduction in magnetic efficiency resulting from permanent magnets while achieving a low profile. The non-reciprocal circuit element includes: a magnetic rotor (10) in which a plurality of central conductors are arranged on a ferrite (20) and that has a top surface, a mounting surface and side surfaces; permanent magnets (30), (31) to (34) that are arranged at the side surfaces of the magnetic rotor (10); and yokes (51) and (52) that are respectively arranged at the top surface side and the mounting surface side of the magnetic rotor (10). In a plan view, end portions of at least one out of the top-surface-side yoke (51) and the mounting-surface-side yoke (52) are superposed with the permanent magnets (31) to (34) and are located inward from end surfaces of the permanent magnets (31) to (34).

公开(公告)号：US20170179998A1

公开(公告)日：2017-06-22

申请号：US15447412

申请日：2017-03-02

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kengo ONAKA ,  Katsuhito KURODA ,  Yuki NAKAIKE ,  Reiji NAKAJIMA

IPC: H04B1/52 ,  H04B1/48 ,  H03H7/38 ,  H01P1/213 ,  H01P1/383

CPC classification number: H04B1/52 ,  H01P1/213 ,  H01P1/383 ,  H03H7/38 ,  H04B1/44 ,  H04B1/48 ,  H04B1/50 ,  H04W4/80

Abstract: A front end circuit includes a circulator having a first port into which a transmission signal is input, a second port into/from which a transmission/reception signal is input/output, and a third port from which a reception signal is output. The impedance of the second port of the circulator is set to a value different from the impedance value of the first port and the third port. With his configuration, the narrowing of a frequency band and the increase in loss, which occur when an impedance matching circuit is additionally provided, are prevented.

公开(公告)号：US20160344100A1

公开(公告)日：2016-11-24

申请号：US15160294

申请日：2016-05-20

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kengo ONAKA ,  Hiroya TANAKA ,  Hidenori OBIYA ,  Yuki NAKAIKE ,  Reiji NAKAJIMA

IPC: H01Q5/335 ,  H01Q1/24

CPC classification number: H01Q5/335 ,  H01Q1/243 ,  H04B1/525

Abstract: A front end circuit and a wireless communication device capable of achieving matching with an antenna across a wide frequency band and capable of suppressing degradation in high-frequency characteristics caused by the influence of transmission signal harmonics is provided. A front end circuit includes a variable matching circuit connected to a low-frequency band transmission port side of a diplexer and a harmonic filter connected between the variable matching circuit and the diplexer. The harmonic filter has a pass band that overlaps with a low-frequency band-side communication band and a stop band that overlaps with a harmonic frequency of the low-frequency band-side communication band.

Abstract translation: 提供了能够实现与宽频带的天线匹配并且能够抑制由发送信号谐波的影响引起的高频特性的劣化的前端电路和无线通信装置。 前端电路包括连接到双工器的低频带传输端口侧的可变匹配电路和连接在可变匹配电路和双工器之间的谐波滤波器。 谐波滤波器具有与低频带侧通信频带和与低频带侧通信频带的谐波频率重叠的阻带重叠的通带。