Patents by Inventor Toshiyuki Nagasaku
Toshiyuki Nagasaku 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).
-
Patent number: 11082102Abstract: A beam forming antenna in which directivity directions of beams can be controlled at higher resolution of control is provided. The beam forming antenna includes a matrix circuit having multiple final output terminals and multiple antenna elements connected to the multiple final output terminals respectively. The matrix circuit includes a first sub-matrix, a second sub-matric, and adders which combine outputs of the first sub-matrix and outputs of the second sub-matrix. By selecting any input terminal out of the multiple input terminals of the first sub-matrix or the multiple input terminals of the second sub-matrix and inputting a signal, a signal having a predetermined phase difference between output terminals is output at the multiple final output terminals and the phase difference between output terminals has a differing value according to a selected input terminal.Type: GrantFiled: September 7, 2018Date of Patent: August 3, 2021Assignee: HITACHI KOKUSAI ELECTRIC INC.Inventor: Toshiyuki Nagasaku
-
Publication number: 20210067217Abstract: A beam forming antenna in which directivity directions of beams can be controlled at higher resolution of control is provided. The beam forming antenna includes a matrix circuit having multiple final output terminals and multiple antenna elements connected to the multiple final output terminals respectively. The matrix circuit includes a first sub-matrix, a second sub-matric, and adders which combine outputs of the first sub-matrix and outputs of the second sub-matrix. By selecting any input terminal out of the multiple input terminals of the first sub-matrix or the multiple input terminals of the second sub-matrix and inputting a signal, a signal having a predetermined phase difference between output terminals is output at the multiple final output terminals and the phase difference between output terminals has a differing value according to a selected input terminal.Type: ApplicationFiled: September 7, 2018Publication date: March 4, 2021Inventor: Toshiyuki NAGASAKU
-
Patent number: 10243525Abstract: A power amplifier includes a carrier amplifier that operates from when an input signal is small, a peak amplifier that starts to operate when the input signal becomes large, a phase adjusting circuit that adjusts phases of an output of the carrier amplifier and an output of the peak amplifier, an impedance transforming line that transforms a load of the carrier amplifier when the input signal is small, and has a characteristic impedance close to an optimum load impedance of the carrier amplifier, and a circuit that is arranged between the output of the carrier amplifier and the impedance transforming line and reduces an output capacitance of the carrier amplifier.Type: GrantFiled: June 15, 2015Date of Patent: March 26, 2019Assignee: Hitachi Kokusai Electric Inc.Inventor: Toshiyuki Nagasaku
-
Patent number: 10199994Abstract: A Doherty amplifier used in a Z ohm based system is provided with a carrier amplifier, a peak amplifier, and an impedance transforming line for transforming the load of the carrier amplifier when an input signal is small. The impedance transforming line has a characteristic impedance lower than Z ohms and equal to the optimum load impedance of the carrier amplifier. The load of the Doherty amplifier is lower than Z ohms. A power amplifier that obtains large output power by combining output powers from a plurality of Doherty amplifiers by a power coupling circuit is constructed.Type: GrantFiled: January 16, 2015Date of Patent: February 5, 2019Assignee: Hitachi Kokusai Electric Inc.Inventor: Toshiyuki Nagasaku
-
Publication number: 20180167042Abstract: A power amplifier includes a carrier amplifier that operates from when an input signal is small, a peak amplifier that starts to operate when the input signal becomes large, a phase adjusting circuit that adjusts phases of an output of the carrier amplifier and an output of the peak amplifier, an impedance transforming line that transforms a load of the carrier amplifier when the input signal is small, and has a characteristic impedance close to an optimum load impedance of the carrier amplifier, and a circuit that is arranged between the output of the carrier amplifier and the impedance transforming line and reduces an output capacitance of the carrier amplifier.Type: ApplicationFiled: June 15, 2015Publication date: June 14, 2018Inventor: Toshiyuki NAGASAKU
-
Publication number: 20180026588Abstract: A Doherty amplifier used in a Z ohm based system is provided with a carrier amplifier, a peak amplifier, and an impedance transforming line for transforming the load of the carrier amplifier when an input signal is small. The impedance transforming line has a characteristic impedance lower than Z ohms and equal to the optimum load impedance of the carrier amplifier. The load of the Doherty amplifier is lower than Z ohms. A power amplifier that obtains large output power by combining output powers from a plurality of Doherty amplifiers by a power coupling circuit is constructed.Type: ApplicationFiled: January 16, 2015Publication date: January 25, 2018Inventor: Toshiyuki NAGASAKU
-
Patent number: 9172331Abstract: A power supply circuit includes: a push-pull amplifier unit which amplifies an input signal with a push-pull amplification protocol; a variable power supply unit which varies, with a control signal, the voltage level of a power supply voltage which is supplied to the push-pull amplifier; a switch control unit which, on the basis of the input signal, outputs the control signal which controls the voltage level of the power supply voltage; and a timing control unit which applies a specified time delay to the input signal. When the control signal rises, the switch control unit causes the control signal to rise at a faster timing, according to the voltage level switch transition timing, than a delay time upon the timing control unit, and when the control signal falls, the switch control unit causes the control signal to fall at the timing of the delay time.Type: GrantFiled: November 19, 2012Date of Patent: October 27, 2015Assignee: Hitachi Kokusai Electric Inc.Inventors: Toshiyuki Nagasaku, Manabu Nakamura, Taizo Ito
-
Publication number: 20140312970Abstract: A power supply circuit includes: a push-pull amplifier unit which amplifies an input signal with a push-pull amplification protocol; a variable power supply unit which varies, with a control signal, the voltage level of a power supply voltage which is supplied to the push-pull amplifier; a switch control unit which, on the basis of the input signal, outputs the control signal which controls the voltage level of the power supply voltage; and a timing control unit which applies a specified time delay to the input signal. When the control signal rises, the switch control unit causes the control signal to rise at a faster timing, according to the voltage level switch transition timing, than a delay time upon the timing control unit, and when the control signal falls, the switch control unit causes the control signal to fall at the timing of the delay time.Type: ApplicationFiled: November 19, 2012Publication date: October 23, 2014Applicant: HITACHI KOKUSAI ELECTRIC INC.Inventors: Toshiyuki Nagasaku, Manabu Nakamura, Taizo Ito
-
Patent number: 8018292Abstract: A transfer impedance from input terminals of a resonator to output terminals of the resonator is larger than a driving-point impedance of the input terminals of the resonator at an oscillation frequency. The input terminals of the resonator are connected with the drain terminals of transistors Q1 and Q2 that are outputs of a differential amplifier, and the output terminals of the resonator are connected with gate terminals of the transistors Q1 and Q2 that are inputs of the differential amplifier. With this configuration, during the oscillating operation, the oscillation voltage amplitude of the gate terminals of the transistors Q1 and Q2 becomes larger than the oscillation voltage amplitude of the drain terminals. Therefore, it is possible to prevent the transistor, which is oscillating, from operating in a triode region, and suppress the deterioration of the Q-factor.Type: GrantFiled: August 12, 2008Date of Patent: September 13, 2011Assignee: Hitachi, Ltd.Inventors: Yusuke Wachi, Toshiyuki Nagasaku
-
Patent number: 7532153Abstract: There is provided a highly accurate velocity sensor having a reduced detection error. A sensor circuit unit generates an electromagnetic wave and emits it from a transmission antenna. Furthermore, a reception antenna receives a reflection wave from the ground and a mixer mixes it with a local signal, thereby generating a low-frequency signal. The electromagnetic wave emitted from the sensor circuit unit shapes a beam by a dielectric lens before emitting it toward the ground. Here, the beam shape is such that the beam width in the vicinity of the sensor is smaller than the beam width in the vicinity of the ground.Type: GrantFiled: November 20, 2007Date of Patent: May 12, 2009Assignee: Hitachi, Ltd.Inventors: Toshiyuki Nagasaku, Hiroshi Kondoh, Hiroshi Shinoda
-
Publication number: 20090072920Abstract: A transfer impedance from input terminals of a resonator to output terminals of the resonator is larger than a driving-point impedance of the input terminals of the resonator at an oscillation frequency. The input terminals of the resonator are connected with the drain terminals of transistors Q1 and Q2 that are outputs of a differential amplifier, and the output terminals of the resonator are connected with gate terminals of the transistors Q1 and Q2 that are inputs of the differential amplifier. With this configuration, during the oscillating operation, the oscillation voltage amplitude of the gate terminals of the transistors Q1 and Q2 becomes larger than the oscillation voltage amplitude of the drain terminals. Therefore, it is possible to prevent the transistor, which is oscillating, from operating in a triode region, and suppress the deterioration of the Q-factor.Type: ApplicationFiled: August 12, 2008Publication date: March 19, 2009Inventors: Yusuke Wachi, Toshiyuki Nagasaku
-
Patent number: 7463182Abstract: An inexpensive surveillance radar apparatus capable of identifying the kind of an object by using a monopulse radar that performs wide-angle two-dimensional surveillance. The radar apparatus receives reflected waves from a plurality of points on a moving object within a monitoring area, using a monopulse radar apparatus for measuring of angles, and determines the reflection point for each reflected wave, and then calculates the position and the width in the measuring angle of the surveillance radar of a moving object.Type: GrantFiled: July 10, 2006Date of Patent: December 9, 2008Assignee: Hitachi, Ltd.Inventors: Mitsutoshi Morinaga, Toshiyuki Nagasaku
-
Publication number: 20080091380Abstract: There is provided a highly accurate velocity sensor having a reduced detection error. A sensor circuit unit generates an electromagnetic wave and emits it from a transmission antenna. Furthermore, a reception antenna receives a reflection wave from the ground and a mixer mixes it with a local signal, thereby generating a low-frequency signal. The electromagnetic wave emitted from the sensor circuit unit shapes a beam by a dielectric lens before emitting it toward the ground. Here, the beam shape is such that the beam width in the vicinity of the sensor is smaller than the beam width in the vicinity of the ground.Type: ApplicationFiled: November 20, 2007Publication date: April 17, 2008Inventors: Toshiyuki Nagasaku, Hiroshi Kondoh, Hiroshi Shinoda
-
Patent number: 7310061Abstract: There is provided a highly accurate velocity sensor having a reduced detection error. A sensor circuit unit generates an electromagnetic wave and emits it from a transmission antenna. Furthermore, a reception antenna receives a reflection wave from the ground and a mixer mixes it with a local signal, thereby generating a low-frequency signal. The electromagnetic wave emitted from the sensor circuit unit shapes a beam by a dielectric lens before emitting it toward the ground. Here, the beam shape is such that the beam width in the vicinity of the sensor is smaller than the beam width in the vicinity of the ground.Type: GrantFiled: August 19, 2005Date of Patent: December 18, 2007Assignee: Hitachi, Ltd.Inventors: Toshiyuki Nagasaku, Hiroshi Kondoh, Hiroshi Shinoda
-
Patent number: 7212152Abstract: The present invention provides that a monopulse radar system to correct an amplitude error and a phase error developed between receiving channels and improve the accuracy of a detected angle. A part of a transmit signal is supplied to respective channels on the receiving side through a signal transmission line for calibration. At this time, the gains of a variable phase shifter and a variable gain amplifier are adjusted so that an azimuth angle of a pseudo target, based on a signal for calibration, which is calculated by signal processing means, reaches a predetermined angle. In the monopulse radar system of the present invention, calibration work is simplified and an angular correction can be automated. The present monopulse radar system of the present invention is capable of coping even with variations in characteristic after product shipment due to environmental variations and time variations in parts characteristic.Type: GrantFiled: April 6, 2004Date of Patent: May 1, 2007Assignee: Hitachi, Ltd.Inventor: Toshiyuki Nagasaku
-
Publication number: 20070090991Abstract: In a configuration of a technique in the related art, since two Doppler sensors are used to measure velocity in two directions, and a set of transmission circuit and reception circuit are provided for each of directions to be measured, a device becomes large and expensive. Moreover, in the related art, since signal processing is performed by using output of each of the two Doppler sensors, axis adjustment in each of emission directions of the two Doppler sensors needs to be performed separately, therefore there is a difficulty that appropriate axis adjustment is complicated and difficult.Type: ApplicationFiled: May 31, 2006Publication date: April 26, 2007Applicant: HITACHI, LTD.Inventors: Tokuji Yoshikawa, Hiroshi Kuroda, Satoru Kuragaki, Toshiyuki Nagasaku
-
Patent number: 7154432Abstract: The invention intends to provide a sensor module suitable for miniaturization and reduction in costs, in the radar sensor that uses a millimeter or sub-millimeter wave signal of which frequency is more than 20 GHz. To accomplish this problem, the radar sensor is integrated into a one chip MMIC, in which an active circuit including an oscillator and a mixer is formed with an antenna on one semiconductor substrate. Further, the MMIC is sealed with a resin package. A dielectric lens is formed on the resin package over the antenna to attain a desired beamwidth. Thereby, the lens and the resin package can integrally be formed by a metal mold, thus reducing the cost.Type: GrantFiled: November 12, 2004Date of Patent: December 26, 2006Assignee: Hitachi, Ltd.Inventors: Toshiyuki Nagasaku, Hiroshi Kondoh, Hiroshi Shinoda
-
Publication number: 20060267764Abstract: An object detection sensor, which can accurately measure the position of an object within a predetermined monitoring area including the vicinity of a position directly under a sensor, is provided. A monitoring area is divided into a plurality of sections and the distances to the section from the sensor are different from one another. A plurality of antennas designed to monitor the each sections respectively are switched therebetween in use. A signal processing circuit performs a calculation for determining a position and a height of an object within a monitoring surface in the area including the position directly under the sensor set, making use of output information of a radar and taking a radiation path into consideration.Type: ApplicationFiled: May 26, 2006Publication date: November 30, 2006Inventors: Mitsutoshi Morinaga, Toshiyuki Nagasaku
-
Patent number: 7132976Abstract: An automotive radar which can process signals at high speed to detect a target in a wide angle range is provided. The automotive radar comprises a transmitting antenna which emits an electromagnetic wave, two receiving antennas which receive the electromagnetic wave reflected by a target, an antenna plate on which the transmitting antenna and two receiving antennas are arranged. It also includes a drive which rotates the antenna plate in an azimuth direction, which corresponds to the direction of arrangement of the two receiving antennas, to scan a detection angle formed by the two receiving antennas. The drive has rest time between scans to stop rotation. The automotive radar also includes a signal processor which detects the azimuth angle of the target with respect to a reference direction during the rest time according to received signals from the two receiving antennas and the rotation angle of the antenna plate at rest.Type: GrantFiled: August 19, 2005Date of Patent: November 7, 2006Assignee: Hitachi, Ltd.Inventors: Hiroshi Shinoda, Toshiyuki Nagasaku, Hiroshi Kondoh
-
Publication number: 20060158369Abstract: An automotive radar which can process signals at high speed to detect a target in a wide angle range is provided. The automotive radar comprises a transmitting antenna which emits an electromagnetic wave, two receiving antennas which receive the electromagnetic wave reflected by a target, an antenna plate on which the transmitting antenna and two receiving antennas are arranged. It also includes a drive which rotates the antenna plate in an azimuth direction, which corresponds to the direction of arrangement of the two receiving antennas, to scan a detection angle formed by the two receiving antennas. The drive has rest time between scans to stop rotation. The automotive radar also includes a signal processor which detects the azimuth angle of the target with respect to a reference direction during the rest time according to received signals from the two receiving antennas and the rotation angle of the antenna plate at rest.Type: ApplicationFiled: August 19, 2005Publication date: July 20, 2006Inventors: Hiroshi Shinoda, Toshiyuki Nagasaku, Hiroshi Kondoh