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公开(公告)号：US20210098895A1
公开(公告)日：2021-04-01
申请号：US17032171
申请日：2020-09-25
申请人： NEC CORPORATION
发明人： Naoki OSHIMA , Keiichi MOTOI
摘要： A polarized wave shared array antenna 10A includes: planar antennas 11a and 11b, each of which generating two polarized waves of first and second polarized waves orthogonal to each other; feeding points 12a and 12b for generating the first polarized wave, which are provided in the planar antenna 11a, and feeding points 14a and 14b for generating the second polarized wave, which are provided in the planar antenna 11b; and an integrated circuit 20 including transmission and reception units 21a, 21b, 22a, and 22b connected to the respective feeding points 12a, 12b, 14a, and 14b via wirings, in which in a plan view, with respect to an axis A1, the feeding points 12a and 14a, respectively, are disposed symmetrical to the feeding points 12b and 14b, and the transmission and reception units 21a and 22a, respectively, are disposed symmetrical to the transmission and reception units 21b and 22b.
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公开(公告)号：US20240356193A1
公开(公告)日：2024-10-24
申请号：US18684931
申请日：2022-01-19
申请人： NEC Corporation
发明人： Keiichi MOTOI , Toshihide KUWABARA , Tomoya KANEKO
CPC分类号： H01Q1/02 , H01Q13/085 , H01Q15/14 , H01Q21/00
摘要： A radio apparatus that has a high heat dissipation performance and can be manufactured at a low cost is provided. A radio apparatus includes a heat dissipation part that dissipates heat generated by a heat generation source to the outside. The heat dissipation part is composed of a solid material, and includes a heat dissipation plate and a plurality of heat dissipation fins provided in the heat dissipation plate, the plurality of heat dissipation fins being disposed on a side of the heat dissipation plate where a radiating element or a reflective element is disposed. The heat dissipation fins form a periodic structure along at least one direction on the heat dissipation plate. Tips of the plurality of heat dissipation fins form a virtual reflective surface that reflects incident waves to the plurality of heat dissipation fins.
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公开(公告)号：US20190020092A1
公开(公告)日：2019-01-17
申请号：US16068153
申请日：2017-01-16
申请人： NEC Corporation
发明人： Keiichi MOTOI
摘要： The objective of the present invention is to provide a filter circuit by which radio wave interference can be avoided through a simple configuration and a frequency band can be effectively used. In order to achieve the objective, the filter circuit according to the present invention is provided with: a first transmission line and a third transmission line each having a predetermined electrical length; a second transmission line opposed to the first transmission line; an input terminal connected to the first transmission line; a fourth transmission line opposed to the third transmission line; a first output terminal and a second output terminal each connected to the fourth transmission line; a first open end connected to the second transmission line; a second open end connected to the third transmission line; a fifth transmission line connected to the second transmission line; a sixth transmission line opposed to the fifth transmission line; a first switch that connects or opens between the fifth transmission line and the ground; and a second switch that connects or opens between the sixth transmission line and the ground. The electrical length of a transmission line composed of the first open end, the second transmission line, and the fifth transmission line, and the electrical length of a transmission line composed of the second open end, the third transmission line, and the sixth transmission line are each three quarters of a second wavelength corresponding to a second frequency which is higher than a first frequency.
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公开(公告)号：US20210344124A1
公开(公告)日：2021-11-04
申请号：US17274303
申请日：2019-09-06
申请人： NEC Corporation
发明人： Keiichi MOTOI
摘要： A communication device includes a first antenna element, a second antenna element, a 180-degree hybrid circuit having a first port configured to generate a sum signal from multiple input signals and a second port configured to generate a difference signal from multiple input signals, a first phase shifter coupled with the 180-degree hybrid circuit to carry out a phase shift by a first phase value, and a second phase shifter coupled with the 180-degree hybrid circuit to carry out a phase shift by a second phase value. The first antenna element is connected to the first port of the 180-degree hybrid circuit while the second antenna element is connected to the second port of the 180-degree hybrid circuit.
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5.发明申请公开(公告)号：US20200274627A1
公开(公告)日：2020-08-27
申请号：US16494805
申请日：2018-04-16
申请人： NEC Corporation
发明人： Keiichi MOTOI , Naoki OSHIMA
摘要： In order to enable a reduction in the time required to calibrate the amplitude phase of an antenna device, this processing device is provided with: a setting unit group which performs setting from a predetermined three or more-valued phase value regarding the phase value of a signal received by each of a plurality of antenna elements or a signal transmitted from each of the antenna elements with respect to a calibration signal, on the basis of information extracted from one control information, and derives set signals that are signals on which the setting has been performed; and a computing unit which outputs a correlation value that is a value indicating a correlation between the sum of the set signals and the control information.
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公开(公告)号：US20200266538A1
公开(公告)日：2020-08-20
申请号：US16757949
申请日：2018-10-23
发明人： Kenichi OKADA , Keiichi MOTOI , Naoki OSHIMA , Rui WU , Jian PANG
摘要： A phase adjustment circuit includes: a local frequency band phase shifter that adjusts a phase of a signal in a local signal frequency band and that outputs the adjusted signal; a frequency-converting mixer that receives the adjusted signal and another signal different from the adjusted signal, and that mixes the adjusted signal with the other signal; and a buffer amplifier that is provided between the local frequency band phase shifter and the frequency-converting mixer, and that is capable of amplifying an input power that is to be input to the frequency-converting mixer so that the input power is up to be in an input power range in which an input-output characteristic of power of the frequency-converting mixer is out of a linear region.
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公开(公告)号：US20180115033A1
公开(公告)日：2018-04-26
申请号：US15564785
申请日：2016-04-08
申请人： NEC CORPORATION
发明人： Keiichi MOTOI
IPC分类号： H01P1/203
CPC分类号： H01P1/203 , H01P1/20327 , H01P1/205
摘要： A first switch is configured to open and close connection between an end part of a first transmission line and ground, and a second switch is configured to open and close connection between an end part of a third transmission line and ground.
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公开(公告)号：US20170317697A1
公开(公告)日：2017-11-02
申请号：US15525197
申请日：2015-07-30
申请人： NEC CORPORATION
发明人： Keiichi MOTOI
CPC分类号： H04B1/04 , H03F1/565 , H03F3/211 , H03F3/2173 , H03F3/2178 , H03F3/245 , H03F3/604 , H03F2200/111 , H03F2200/336 , H03F2200/387 , H03H7/0153 , H03H7/09 , H03H7/175 , H03H7/1775 , H03H7/38
摘要： A multi-bit digital signal that is generated by modulating a baseband signal by a modulation circuit and includes components in a radio frequency band is amplified by switch-mode amplifiers (100-1, 100-2) on a bit-by-bit basis, amplified signals are band-limited by frequency-variable variable band limiting units (201-1, 201-2) and thereafter subjected to voltage-to-current conversion by voltage/current source conversion units (202-1, 202-2) provided with variable capacitances, the signals converted to current are synthesized at a synthesis point X, and a resultant signal is impedance-corrected by an impedance correction unit (203) and output as a transmission signal to an antenna of a load (300). Consequently, the present invention provides a transmitter capable of synthesizing output signals from a plurality of switch-mode amplifiers and transmitting a resultant signal while maintaining an impedance characteristic with respect to a plurality of transmit frequencies without increasing a circuit size.
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公开(公告)号：US20170104456A1
公开(公告)日：2017-04-13
申请号：US15123023
申请日：2014-10-29
申请人： NEC Corporation
发明人： Keiichi MOTOI , Kazumi SHIIKUMA , Shinichi HORI
CPC分类号： H03F1/0288 , H03F1/56 , H03F3/19 , H03F3/217 , H03F3/24 , H03F3/245 , H03F2200/171 , H03F2200/336 , H03F2200/387 , H03F2200/451 , H04B1/0475 , H04B2001/0408
摘要： A transmitter according to an exemplary aspect of the present invention includes: a modulation circuit configured to modulate a baseband signal into a multi-bit digital signal including a component in a radio-frequency band; a plurality of switch-mode power amplifiers corresponding to each bit of the multi-bit digital signal output from the modulation circuit; and a signal synthesis circuit including a band limiting unit configured to perform a band limitation on output signals from the plurality of switch-mode power amplifiers, and a plurality of voltage-to-current converting units configured to perform a voltage-to-current conversion on respective output signals from the plurality of switch-mode power amplifiers, the signal synthesis circuit configured to makes a synthesized signal connecting the band limiting unit and the plurality of voltage-to-current converting units, wherein, depending on an output power at a synthesis point where the synthesized signal is made, a switch-mode power amplifier is selected which is configured to receive input of a pulse, and a pulse number of pulses to be inputted into the selected switch-mode power amplifier is controlled.
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