Patents by Inventor Izuru Naitou
Izuru Naitou 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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Patent number: 7587652Abstract: A variable power distributor capable of calculating an error between transmission lines of two systems after building a variable power distributor and correcting the set value of the amplitude and the phase according to the error, an error detection method for the variable power distributor, and a set value correction method is provided. The variable power distributor includes: a two-way distributor provided on an input side of a set of transmission lines consisting of a first and a second transmission line; a 90-degree hybrid circuit provided on an output side of the set of transmission lines; and a variable phase shifter, variable resistance attenuator, and a power amplifier provided on each line of the set of transmission lines between the two-way distributor and the 90-degree hybrid circuit.Type: GrantFiled: March 26, 2004Date of Patent: September 8, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazushi Nishizawa, Nobuyasu Takemura, Hiroaki Miyashita, Yoshihiko Konishi, Izuru Naitou, Yoshihiko Imai
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Publication number: 20060234869Abstract: An object of the present invention is to provide a variable power distributor capable of calculating an error between transmission lines of two systems after building a variable power distributor and correcting the set value of the amplitude and the phase according to the error, an error detection method for the variable power distributor, and a set value correction method. The variable power distributor includes: a two-way distributor provided on an input side of a set of transmission lines consisting of a first and a second transmission line; a 90-degree hybrid circuit provided on an output side of the set of transmission lines; and a variable phase shifter, variable resistance attenuator, and a power amplifier which are provided on each of the set of the transmission lines between the two-way distributor and the 90-degree hybrid circuit.Type: ApplicationFiled: March 26, 2004Publication date: October 19, 2006Inventors: Kazushi Nishizawa, Nobuyasu Takemura, Hiroaki Miyashita, Yoshihiko Konishi, Izuru Naitou, Yoshihiko Imai
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Patent number: 7103385Abstract: In a moving body satellite communication apparatus for performing communication with a satellite by an antenna with a radome mounted on a moving body such as an aircraft, loss due to transmission through the radome, and distortion of polarization characteristics are compensated in the inside of the antenna. Variable phase shifters 9a and 9b and variable attenuators 19a and 19b, and variable phase shifters 10a and 10b and variable attenuators 20a and 20b are respectively controlled as one body in each channel, and the whole power EIRP radiated from the antenna is also optimally controlled by a common variable attenuator 21 inserted independently from the variable attenuators 19a and 19b, and therefore, radome correction and EIRP control can be simultaneously realized by a relatively simple circuit.Type: GrantFiled: October 30, 2003Date of Patent: September 5, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Norio Takeuchi, Izuru Naitou, Eiichi Sakai, Yutaka Shimawaki
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Patent number: 7098859Abstract: In a variable power divider including a first 90° phase combiner (30), a second 90° phase combiner (40), and a phase-amplitude adjustment block (50), the phase-amplitude adjustment block (50) includes, correspondingly to two-channel polarized signals, variable phase shifters (51, 52) for adjusting their phase amounts and variable attenuators (55, 56) for adjusting amplitudes (attenuation amounts), and the phase amounts and the amplitudes of the two-channel polarized signals can be adjusted by an antenna control unit (60). Further, there are included a phase shifter (53) and an attenuator (57) provided on two-channel signal lines between an orthomode transducer (20) and a first 90° phase combiner (30) and for equalizing the amplitudes and phases of the two-channel polarized signals.Type: GrantFiled: October 30, 2003Date of Patent: August 29, 2006Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Yutaka Shimawaki, Norio Takeuchi, Izuru Naitou, Hidenori Yoshizawa
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Publication number: 20060097940Abstract: In a variable power divider including a first 90° phase combiner (30), a second 90° phase combiner (40), and a phase-amplitude adjustment block (50), the phase-amplitude adjustment block (50) includes, correspondingly to two-channel polarized signals, variable phase shifters (51, 52) for adjusting their phase amounts and variable attenuators (55, 56) for adjusting amplitudes (attenuation amounts), and the phase amounts and the amplitudes of the two-channel polarized signals can be adjusted by an antenna control unit (60). Further, there are included a phase shifter (53) and an attenuator (57) provided on two-channel signal lines between an orthomode transducer (20) and a first 90° phase combiner (30) and for equalizing the amplitudes and phases of the two-channel polarized signals.Type: ApplicationFiled: October 30, 2003Publication date: May 11, 2006Applicant: Mitsubishi Denki Kabushiki KaishaInventors: Yutaka Shimawaki, Norio Takeuchi, Izuru Naitou, Hidenori Yoshizawa
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Publication number: 20060046638Abstract: In a moving body satellite communication apparatus for performing communication with a satellite by an antenna with a radome mounted on a moving body such as an aircraft, loss due to transmission through the radome, and distortion of polarization characteristics are compensated in the inside of the antenna. Variable phase shifters 9a and 9b and variable attenuators 19a and 19b, and variable phase shifters 10a and 10b and variable attenuators 20a and 20b are respectively controlled as one body in each channel, and the whole power EIRP radiated from the antenna is also optimally controlled by a common variable attenuator 21 inserted independently from the variable attenuators 19a and 19b, and therefore, radome correction and EIRP control can be simultaneously realized by a relatively simple circuit.Type: ApplicationFiled: October 30, 2003Publication date: March 2, 2006Inventors: Norio Takeuchi, Izuru Naitou, Eiichi Sakai, Yutaka Shimawaki
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Patent number: 6774862Abstract: A multibeam antenna apparatus is disclosed. The multibeam antenna apparatus includes a main reflector (1), a sub-reflector (2), a focused beam feeder (3), a primary radiator array (5) having a plurality of primary radiators (5a), and a lens array (10) having a plurality of wavefront transformation lenses (10a) corresponding to the plurality of primary radiators (5a), respectively. The lens array (10) can be placed in the vicinity of a front end of the primary radiator array (5). As an alternative, the lens array (10) is placed in an electric wave propagation range of the focused beam feeder (3) where multiple beams which constitute a multibeam are spatially isolated from one another in terms of electric power. Thus the multibeam antenna apparatus can prevent an error from occurring in the orientation of each beam.Type: GrantFiled: November 4, 2002Date of Patent: August 10, 2004Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Tomohiro Mizuno, Hiroyuki Satou, Izuru Naitou, Soichi Matsumoto
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Publication number: 20030214451Abstract: A multibeam antenna apparatus is disclosed. The multibeam antenna apparatus includes a main reflector (1), a sub-reflector (2), a focused beam feeder (3), a primary radiator array (5) having a plurality of primary radiators (5a), and a lens array (10) having a plurality of wavefront transformation lenses (10a) corresponding to the plurality of primary radiators (5a), respectively. The lens array (10) can be placed in the vicinity of a front end of the primary radiator array (5). As an alternative, the lens array (10) is placed in an electric wave propagation range of the focused beam feeder (3) where multiple beams which constitute a multibeam are spatially isolated from one another in terms of electric power. Thus the multibeam antenna apparatus can prevent an error from occurring in the orientation of each beam.Type: ApplicationFiled: November 4, 2002Publication date: November 20, 2003Applicant: MITSUBISHI DENKI KABUSHIKI KAISHAInventors: Tomohiro Mizuno, Hiroyuki Satou, Izuru Naitou, Soichi Matsumoto