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公开(公告)号：US11387542B2
公开(公告)日：2022-07-12
申请号：US16912746
申请日：2020-06-26
IPC分类号： H04B1/00 , H01Q1/22 , H03H7/40 , H04B1/7075
摘要： An antenna apparatus includes an antenna element, a switch with a common terminal that is electrically connected to the antenna element side, a first signal path provided between a first input/output terminal of the switch and a first communication circuit, and a second signal path provided between a second input/output terminal of the switch and a second communication circuit. The first signal path includes a radio-frequency circuit and a phase shifter, and the RF circuit has an impedance that is open or shorted in a second frequency band as seen from the antenna element side. In a state in which the first input/output terminal and the second input/output terminal are both electrically connected to the common terminal, the phase shifter provides a phase shift, and the impedance in the second frequency band of the first signal path as seen from the common terminal is open.
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公开(公告)号：US10950381B2
公开(公告)日：2021-03-16
申请号：US15928292
申请日：2018-03-22
发明人： Kenichi Ishizuka , Hirokazu Yazaki
IPC分类号： H01F27/40 , H01F17/00 , H01L27/01 , H05K1/11 , H01F27/28 , H03H1/00 , H01G4/40 , H01F27/34 , H01L49/02 , H05K1/16 , H03H7/01
摘要： A surface-mounted LC device that includes a substrate having a first surface, multiple inductors formed on the first surface and formed respectively by multiple coiled conductor patterns, a first insulating layer covering the multiple coiled conductor patterns, and a capacitor that is formed on the first insulating layer by a planar electrode. Moreover, the planar electrode covers first zones in which portions of the coiled conductor patterns are adjacent to each other and current directions are opposite to each other in a plan view of the surface-mounted LC device.
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公开(公告)号：US10734970B2
公开(公告)日：2020-08-04
申请号：US16179004
申请日：2018-11-02
发明人： Kenichi Ishizuka
摘要： A phase shifter module includes a base material, a common terminal, and individual terminals, the common terminal and the individual terminals being provided at the base material. Inside the base material, phase shifters that are connected between the individual terminals and the common terminal, respectively, are provided. The phase shifters each include a primary coil and a secondary coil that is coupled to the primary coil by magnetic field coupling and define a transformer phase shifter. With this configuration, a phase shifter module for use with SAW filters while reducing or preventing interference among the SAW filters, a multiplexer/demultiplexer that includes the phase shifter module, and a communication apparatus that includes the phase shifter module, are obtained.
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公开(公告)号：US10327317B2
公开(公告)日：2019-06-18
申请号：US15830017
申请日：2017-12-04
摘要： A mobile wireless terminal includes a metal casing, a printed wiring board disposed in the metal casing and including a ground conductor thereon, the ground conductor defining a ground plane for both a power supply circuit and an antenna, a capacitor connected to the metal casing and the ground conductor, and an overcurrent protective element connected to the metal casing and the ground conductor and having an operating voltage higher than a maximum instantaneous value of a commercial power supply voltage. A capacitance of the overcurrent protective element may be smaller than a capacitance of the capacitor. The capacitor may be a multilayer ceramic capacitor, and the overcurrent protective element may be a discharge gap overcurrent protective element.
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公开(公告)号：US09711848B2
公开(公告)日：2017-07-18
申请号：US14681222
申请日：2015-04-08
发明人： Noboru Kato , Kenichi Ishizuka
CPC分类号： H01Q1/50 , H01F17/0013 , H01P1/20345 , H01P1/2135 , H01Q5/335 , H01Q5/364 , H01Q9/30
摘要： An antenna device includes an antenna element and an impedance converting circuit connected to the antenna element. The impedance converting circuit is connected to a power-supply end of the antenna element. The impedance converting circuit is interposed between the antenna element and a power-supply circuit. The impedance converting circuit includes a first inductance element connected to the power-supply circuit and a second inductance element coupled to the first inductance element. A first end and a second end of the first inductance element are connected to the power-supply circuit and the antenna, respectively. A first end and a second end of the second inductance element are connected to the antenna element and ground, respectively.
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公开(公告)号：US09099770B2
公开(公告)日：2015-08-04
申请号：US14047339
申请日：2013-10-07
发明人： Kenichi Ishizuka , Noboru Kato , Koji Shiroki
CPC分类号： H01Q1/22 , H01Q1/243 , H01Q1/52 , H01Q9/40 , H04M1/0277 , Y10T29/49018
摘要： A communication terminal device includes a printed wiring board disposed in a casing, a feed pattern provided on a main surface of the printed wiring board, a radiation plate including a substantially planar radiation portion substantially perpendicular to the main surface of the printed wiring board and a lead portion connecting the radiation portion to the feed pattern, and a component mounted on the main surface of the printed wiring board to overlap the lead portion when the main surface of the printed wiring board is viewed from above, the component including a conductive material, a magnetic material and/or a dielectric material. The radiation portion is connected to the lead portion at a side spaced away from the main surface of the printed wiring board, and an area of the lead portion is located at a predetermined distance from the main surface of the printed wiring board.
摘要翻译： 通信终端装置包括设置在壳体中的印刷布线板，设置在印刷布线板的主表面上的馈送图案，辐射板，其包括基本上垂直于印刷线路板的主表面的大致平面的辐射部分，以及 将辐射部分连接到馈送图案的引线部分，以及当从上方观察印刷电路板的主表面时安装在印刷线路板的主表面上以与引线部分重叠的部件，该部件包括导电材料， 磁性材料和/或介电材料。 辐射部分在与印刷电路板的主表面间隔开的一侧连接到引线部分，并且引线部分的区域位于与印刷线路板的主表面预定距离处。
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公开(公告)号：US11901611B2
公开(公告)日：2024-02-13
申请号：US17356568
申请日：2021-06-24
发明人： Takafumi Nasu , Kenichi Ishizuka
摘要： An antenna device includes a first radiating element, a second radiating element having lower radiation efficiency than the first radiating element, a coupling element including first and second coils that are electromagnetically coupled to each other, and first and second phase adjusting elements. The first and second phase adjusting elements induce, at a resonant frequency of the second radiating element, a predetermined proportion of current flowing through the second radiating element to the first radiating element.
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公开(公告)号：US11289258B2
公开(公告)日：2022-03-29
申请号：US15681483
申请日：2017-08-21
发明人： Akira Ochiai , Kenichi Ishizuka
摘要： In a high-frequency transformer element includes a primary coil including first coil conductors and a secondary coil including second coil conductors are disposed in a multilayer body that includes a plurality of insulating layers. A magnetic-field cancellation conductor pattern is disposed in the multilayer body, is adjacent to some conductors of the first coil conductors in a lamination direction of the insulating layers, is arranged along a surface of the insulating layers, and allows a high-frequency current to flow in a direction opposite a high-frequency current flowing in the first coil conductors.
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公开(公告)号：US10181644B2
公开(公告)日：2019-01-15
申请号：US15921700
申请日：2018-03-15
发明人： Hiroshi Nishida , Kenichi Ishizuka
IPC分类号： H01Q5/335 , H01F17/00 , H01F27/00 , H01Q1/50 , H01Q9/04 , H04B1/40 , H01Q5/10 , H01Q5/328 , H01F27/28 , H01Q1/24 , H04B1/401 , H03H7/38 , H04M1/725
摘要： An antenna circuit includes a radiation conductor, a matching circuit disposed between a feeding port in the radiation conductor and a feeder circuit, and a frequency-characteristics adjusting circuit connected between a frequency-characteristics adjustment port in the radiation conductor and a ground and including a variable reactance circuit. The matching circuit includes a first inductance element connected in shunt. The frequency-characteristics adjusting circuit includes a second inductance element. The first inductance element and the second inductance element are magnetically coupled to each other.
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公开(公告)号：US20180041182A1
公开(公告)日：2018-02-08
申请号：US15726477
申请日：2017-10-06
发明人： Hiroshi Nishida , Kenichi Ishizuka
摘要： A resonant circuit includes a first inductor and a first capacitor which define a first series circuit and a second inductor connected in parallel to the first series circuit. The first inductor and the second inductor are coupled via a magnetic field in a direction in which magnetic fluxes passing through the inductor and the second inductor strengthen each other to effectively increase steepness in a transient band.
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