Patents by Inventor Kazunari Kihira
Kazunari Kihira has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230246346Abstract: An array antenna device includes: a ground plate that is a flat-plate shaped conductor; an element antenna array in which a plurality of tapered slot antennas are linearly arranged on the ground plate along an electric field direction; and a metal plate provided at both ends or one end of an antenna aperture formed in the element antenna array arranged on the ground plate along the electric field direction, the metal plate having a height from the ground plate higher than a height of the tapered slot antenna.Type: ApplicationFiled: April 10, 2023Publication date: August 3, 2023Applicant: Mitsubishi Electric CorporationInventors: Hikaru Watanabe, Toru Takahashi, Kazunari Kihira, Toru Fukasawa
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Patent number: 11605903Abstract: Waveguide slot array antennas each having slots, that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide and waveguide slot array antennas each having slots that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide, and the waveguide slot array antennas and the waveguide slot array antennas are alternately arranged, the waveguide is a ridge waveguide having a ridge formed inside the waveguide, and the waveguide is a ridge waveguide having ridges, formed inside the waveguide.Type: GrantFiled: August 10, 2016Date of Patent: March 14, 2023Assignee: Mitsubishi Electric CorporationInventors: Hikaru Watanabe, Takashi Maruyama, Masataka Otsuka, Yu Ushijima, Kazunari Kihira
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Patent number: 11228104Abstract: A calibration device of an array antenna is for a transmission means including a plurality of antenna elements and transmission signal processing systems corresponding to the plurality of antenna elements, in which an antenna element transmission signal is calibrated for amplitude and phase differences and a time difference for each of the antenna elements on the basis of a transmission signal calibrating value, the transmission means being for generating a plurality of transmission radio waves applied with amplitude and phase differences and a time difference corresponding to each of the plurality of antenna elements and emitting the transmission radio waves from the respective antenna elements, the calibration device including: a multicarrier calibration signal generating means for generating a plurality of calibration signals based on, in correspondence, a plurality of subcarriers including a first frequency unit of a subcarrier to which a subcarrier symbol is assigned and a second frequency unit not assigType: GrantFiled: July 24, 2018Date of Patent: January 18, 2022Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kazunari Kihira, Toru Fukasawa
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Publication number: 20210344111Abstract: A calibration device of an array antenna is for a transmission means including a plurality of antenna elements and transmission signal processing systems corresponding to the plurality of antenna elements, in which an antenna element transmission signal is calibrated for amplitude and phase differences and a time difference for each of the antenna elements on the basis of a transmission signal calibrating value, the transmission means being for generating a plurality of transmission radio waves applied with amplitude and phase differences and a time difference corresponding to each of the plurality of antenna elements and emitting the transmission radio waves from the respective antenna elements, the calibration device including: a multicarrier calibration signal generating means for generating a plurality of calibration signals based on, in correspondence, a plurality of subcarriers including a first frequency unit of a subcarrier to which a subcarrier symbol is assigned and a second frequency unit not assigType: ApplicationFiled: July 24, 2018Publication date: November 4, 2021Applicant: Mitsubishi Electric CorporationInventors: Kazunari KIHIRA, Toru FUKASAWA
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Patent number: 10992039Abstract: An array antenna device, including: a waveguide (1) having a plurality of radiation units (2) arranged on one tube wall thereof, in which the waveguide (1) has a plurality of grooves (3) arranged on an inner side of a tube wall facing the tube wall, movable short-circuit surfaces (4) each electrically short-circuited to an inner wall of one of the grooves (3), and movable short-circuit surface controlling mechanisms (5) for changing positions of the movable short-circuit surfaces (4).Type: GrantFiled: August 30, 2016Date of Patent: April 27, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Kei Yokokawa, Jun Goto, Kazunari Kihira, Tomohiro Takahashi, Masataka Otsuka, Narihiro Nakamoto, Toru Fukasawa, Takuro Sasaki, Tomohiro Mizuno
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Publication number: 20190260137Abstract: Waveguide slot array antennas each having slots, that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide and waveguide slot array antennas each having slots that transmit or receive electromagnetic waves and that are formed in a front surface of a waveguide, and the waveguide slot array antennas and the waveguide slot array antennas are alternately arranged, the waveguide is a ridge waveguide having a ridge formed inside the waveguide, and the waveguide is a ridge waveguide having ridges, formed inside the waveguide.Type: ApplicationFiled: August 10, 2016Publication date: August 22, 2019Applicant: Mitsubishi Electric CorporationInventors: Hikaru WATANABE, Takashi MARUYAMA, Masataka OTSUKA, Yu USHIJIMA, Kazunari KIHIRA
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Publication number: 20190229418Abstract: An array antenna device, including: a waveguide (1) having a plurality of radiation units (2) arranged on one tube wall thereof, in which the waveguide (1) has a plurality of grooves (3) arranged on an inner side of a tube wall facing the tube wall, movable short-circuit surfaces (4) each electrically short-circuited to an inner wall of one of the grooves (3), and movable short-circuit surface controlling mechanisms (5) for changing positions of the movable short-circuit surfaces (4).Type: ApplicationFiled: August 30, 2016Publication date: July 25, 2019Applicant: Mitsubishi Electric CorporationInventors: Kei YOKOKAWA, Jun GOTO, Kazunari KIHIRA, Tomohiro TAKAHASHI, Masataka OTSUKA, Narihiro NAKAMOTO, Toru FUKASAWA, Takuro SASAKI, Tomohiro MIZUNO
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Patent number: 10284239Abstract: Disclosed is an antenna device including element antennas for receiving signals, phase control units for controlling the phases of the signals received by the element antennas, a phase value series acquiring unit for acquiring phase value series in which phase values differing among the element antennas and changing with time are provided, a phase value setting unit for setting the phase values to the phase control units in accordance with the phase value series, a combining unit for combining the signals whose phases are controlled into a composite signal, an ADC for digitizing the composite signal, a frequency calculating unit for calculating frequency shift amounts from the phase value series, DDCs for performing frequency conversion on the digitized signal by using the frequency shift amounts, LPFs each for performing low-pass filtering on the signal on which the frequency conversion is performed, and a beam forming unit for forming one or more beam signals by using the signals on each of which the low-paType: GrantFiled: February 6, 2015Date of Patent: May 7, 2019Assignee: Mitsubishi Electric CorporationInventors: Tasuku Kuriyama, Kazunari Kihira, Masataka Otsuka
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Patent number: 10142000Abstract: A sub-array number determinator is provided to determine a number of sub-arrays to be allocated to each of user terminals detected by a terminal position detector on a basis of relation between positions of the user terminals and a position of an antenna apparatus. An antenna selector selects sub-arrays for the number determined by the sub-array number determinator from among the sub-arrays and allocates the selected sub-arrays for the determined number to each of the user terminals. This structure is capable of preventing interference among beams for user terminals and providing excellent communication quality to the user terminals even in condition where the user terminals are adjacent to each other.Type: GrantFiled: April 15, 2015Date of Patent: November 27, 2018Assignee: Mitsubishi Electric CorporationInventors: Kazunari Kihira, Makoto Matsuki, Hikaru Watanabe, Hiroki Iura, Masataka Otsuka
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Publication number: 20180287678Abstract: A sub-array number determinator is provided to determine a number of sub-arrays to be allocated to each of user terminals detected by a terminal position detector on a basis of relation between positions of the user terminals and a position of an antenna apparatus. An antenna selector selects sub-arrays for the number determined by the sub-array number determinator from among the sub-arrays and allocates the selected sub-arrays for the determined number to each of the user terminals. This structure is capable of preventing interference among beams for user terminals and providing excellent communication quality to the user terminals even in condition where the user terminals are adjacent to each other.Type: ApplicationFiled: April 15, 2015Publication date: October 4, 2018Applicant: Mitsubishi Electric CorporationInventors: Kazunari KIHIRA, Makoto MATSUKI, Hikaru WATANABE, Hiroki IURA, Masataka OTSUKA
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Publication number: 20180269911Abstract: Disclosed is an antenna device including element antennas for receiving signals, phase control units for controlling the phases of the signals received by the element antennas, a phase value series acquiring unit for acquiring phase value series in which phase values differing among the element antennas and changing with time are provided, a phase value setting unit for setting the phase values to the phase control units in accordance with the phase value series, a combining unit for combining the signals whose phases are controlled into a composite signal, an ADC for digitizing the composite signal, a frequency calculating unit for calculating frequency shift amounts from the phase value series, DDCs for performing frequency conversion on the digitized signal by using the frequency shift amounts, LPFs each for performing low-pass filtering on the signal on which the frequency conversion is performed, and a beam forming unit for forming one or more beam signals by using the signals on each of which the low-paType: ApplicationFiled: February 6, 2015Publication date: September 20, 2018Applicant: Mitsubishi Electric CorporationInventors: Tasuku KURIYAMA, Kazunari KIHIRA, Masataka OTSUKA
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Patent number: 9917377Abstract: Disclosed is an antenna device in which an excitation phase changing unit (4) for changing the excitation phases of element antennas (2-1n) to (2-8n) by controlling phase shifters (3-1n) to (3-8n) dependently on preset phase values is disposed, and every time the excitation phases are changed by the excitation phase changing unit (4), a radiation pattern forming unit (12) shifts the phases of a sum signal and a difference signal, and forms a monopulse sum pattern by time-integrating the sum signal after phase shift and also forms a monopulse difference pattern by time-integrating the difference signal after phase shift.Type: GrantFiled: February 1, 2016Date of Patent: March 13, 2018Assignee: Mitsubishi Electric CorporationInventors: Makoto Matsuki, Kazunari Kihira, Masataka Otsuka
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Publication number: 20180019524Abstract: Disclosed is an antenna device in which an excitation phase changing unit (4) for changing the excitation phases of element antennas (2-1n) to (2-8n) by controlling phase shifters (3-1n) to (3-8n) dependently on preset phase values is disposed, and every time the excitation phases are changed by the excitation phase changing unit (4), a radiation pattern forming unit (12) shifts the phases of a sum signal and a difference signal, and forms a monopulse sum pattern by time-integrating the sum signal after phase shift and also forms a monopulse difference pattern by time-integrating the difference signal after phase shift.Type: ApplicationFiled: February 1, 2016Publication date: January 18, 2018Applicant: Mitsubishi Electric CorporationInventors: Makoto MATSUKI, Kazunari KIHIRA, Masataka OTSUKA
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Patent number: 8542785Abstract: A communication apparatus that can suppress an increase in circuit size and reduce influence of interference, includes reception array antenna elements, a reception digital beam forming (DBF) network that generates a reception beam signal for forming M reception beams using a reception signal, and reception filter banks (FBs) that generate frequency split reception beam signals obtained by frequency-splitting the reception beam signal. The communication apparatus includes an interference-source detecting unit that stores, for each reception beam, an interference candidate beam area estimated based on an initial reception beam characteristic, calculates, based on the frequency split reception beam signals, a reception spectrum, and calculates, based on the reception spectrum and a reception spectrum of a reception beam to the interference candidate beam area, an interference source area.Type: GrantFiled: July 2, 2009Date of Patent: September 24, 2013Assignee: Mitsubishi Electric CorporationInventors: Akinori Fujimura, Kazunari Kihira, Yasushi Sogabe
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Publication number: 20110206155Abstract: A communication apparatus that can suppress an increase in circuit size and reduce influence of interference, includes reception array antenna elements, a reception DBF network that generates a reception beam signal for forming M reception beams using a reception signal, and reception FBs that generate frequency split reception beam signals obtained by frequency-splitting the reception beam signal. The communication apparatus includes an interference-source detecting unit that stores, for each reception beam, an interference candidate beam area estimated based on an initial reception beam characteristic, calculates, based on the frequency split reception beam signals, a reception spectrum, and calculates, based on the reception spectrum and a reception spectrum of a reception beam to the interference candidate beam area, an interference source area. The reception DFB network generates a reception beam signal to perform null formation in the direction of the interference source area.Type: ApplicationFiled: July 2, 2009Publication date: August 25, 2011Applicant: Mitsubishi Electric CorporationInventors: Akinori Fujimura, Kazunari Kihira, Yasushi Sogabe
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Publication number: 20100150013Abstract: A calibration method according to the present invention includes a step of first channel estimating for transmitting a pilot signal from a first antenna and receiving the pilot signal at a second antenna different from the first antenna to calculate a first channel estimation value; a step of second channel estimating for transmitting a plot signal from the second antenna and receiving the pilot signal at the first antenna to calculate a second channel estimation value; and a step of correction coefficient calculating for calculating, by using the first and second channel estimation values, a correction coefficient.Type: ApplicationFiled: January 10, 2008Publication date: June 17, 2010Applicant: Mitsubishi Electric CorporationInventors: Yoshitaka Hara, Akinori Taira, Kenichi Tajima, Kazunari Kihira, Michiaki Takano, Kazuaki Ishioka, Yasunori Nouda
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Patent number: 6788269Abstract: There are disposed four antenna elements which are arranged circumferentially at regular intervals, and four 90-degree hybrids each having four terminals, two 90-degree hybrids which are arranged in parallel are connected in two stages, only one of the output terminals of an upstream 90-degree hybrid and only one of the input terminal of a downstream 90-degree hybrid cross each other and are connected to each other, and the four output terminals of the two downstream 90-degree hybrids and the four antenna elements are connected to each other; the passing phase between the terminals that cross each other within the respective 90-degree hybrids is set to 0 degree, and the passing phase between the terminals that are in parallel within the respective 90-degree hybrids is set to 90 degrees. As a result, the structure of the feed circuit can be simplified, and plural kinds of beams can be formed.Type: GrantFiled: March 3, 2003Date of Patent: September 7, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Isamu Chiba, Kazunari Kihira, Rumiko Yonezawa, Shuji Urasaki
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Publication number: 20030164804Abstract: There are disposed four antenna elements which are arranged circumferentially at regular intervals, and four 90-degree hybrids each having four terminals, two 90-degree hybrids which are arranged in parallel are connected in two stages, only one of the output terminals of an upstream 90-degree hybrid and only one of the input terminal of a downstream 90-degree hybrid cross each other and are connected to each other, and the four output terminals of the two downstream 90-degree hybrids and the four antenna elements are connected to each other; the passing phase between the terminals that cross each other within the respective 90-degree hybrids is set to 0 degree, and the passing phase between the terminals that are in parallel within the respective 90-degree hybrids is set to 90 degrees. As a result, the structure of the feed circuit can be simplified, and plural kinds of beams can be formed.Type: ApplicationFiled: March 3, 2003Publication date: September 4, 2003Inventors: Isamu Chiba, Kazunari Kihira, Rumiko Yonezawa, Shuji Urasaki
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Patent number: 6404387Abstract: Since adaptive control has been made by using different reference characters every transmitter-receiver, it has been necessary to provide an adaptive control device every transmitter-receiver. Hereupon, an adaptive array antenna apparatus according to the invention provides a weighting control device for calculating a weight coefficient to control weighting processing so that electric power of array signals synthesized by applying weighting processing to signals received by antennas of a plurality of systems becomes minimum, and an adaptive control device for using the weight coefficient for application of weighting processing to thereby form null points of antenna directivity in a direction, along which interference signals having a greater electric power than that of desired signals arrive, to remove the interference signals and to output array signals to transmitter-receivers.Type: GrantFiled: July 18, 2001Date of Patent: June 11, 2002Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazunari Kihira, Isamu Chiba