Patents by Inventor Kazunari Kawahata

Kazunari Kawahata 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).

  • Publication number: 20200379086
    Abstract: Provided is an object shape detection apparatus that can detect the shape of a raised or depressed portion on the surface of an object. In accordance with a comparison result obtained by a reflection intensity comparator with regard to intensity of a horizontally polarized wave component and a vertically polarized wave component of a reflected wave, the object shape determiner detects the shape of the raised portion and the shape of the depressed portion of a detection target object. The object locator detects the position of the raised portion and the position of the depressed portion of the detection target object by measuring the distance to the raised portion and the distance to the depressed portion of the detection target object detected by the object shape determiner.
    Type: Application
    Filed: August 19, 2020
    Publication date: December 3, 2020
    Inventors: Takuya MAEKAWA, Atsuyuki YUASA, Kazunari KAWAHATA
  • Publication number: 20200312798
    Abstract: A feeding element is disposed on or in a first substrate. A second substrate overlies the feeding element. The second substrate is a flexible substrate including an extending portion extending outside the first substrate. A parasitic element coupled to the feeding element is disposed on or in the second substrate. A radiating electrode connected to the parasitic element is disposed on the extending portion of the second substrate.
    Type: Application
    Filed: June 12, 2020
    Publication date: October 1, 2020
    Inventor: Kazunari KAWAHATA
  • Patent number: 10777902
    Abstract: A Luneburg lens antenna device includes a Luneburg lens and an array antenna. The Luneburg lens is formed in a cylindrical shape, and the Luneburg lens includes three dielectric layers through having different dielectric constants and stacked on each other in the radial direction. The array antenna includes plural antenna elements disposed on an outer peripheral surface of the Luneburg lens and at different positions of focal points in the peripheral direction and in the axial direction of the Luneburg lens. The array antenna is provided in a range which is ½ or smaller of the entire range of the Luneburg lens in the peripheral direction.
    Type: Grant
    Filed: May 23, 2018
    Date of Patent: September 15, 2020
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Kazunari Kawahata
  • Patent number: 10468777
    Abstract: A Luneburg lens antenna device includes a Luneburg lens, a plurality of patch antennas, and a plurality of low-frequency antennas. The Luneburg lens is formed in a cylindrical shape and includes three dielectric layers having different dielectric constants and stacked on each other in the radial direction. The plurality of patch antennas respectively include ground electrodes which cover the outer peripheral surface of radiating elements, and form high-frequency MIMO antennas. The plurality of low-frequency antennas are monopole antennas using the ground electrodes, and form low-frequency MIMO antennas.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: November 5, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventor: Kazunari Kawahata
  • Patent number: 10276943
    Abstract: A patch array antenna includes a ground plane and a plurality of radiation elements that are disposed being distanced from the ground plane. A conductive metal member is disposed above a surface on which the plurality of radiation elements are disposed. The metal member overlaps with part of a region of each of the plurality of radiation elements in a direction orthogonal to an array direction of the patch array antenna and does not overlap with the other part of the region, and continuously extends from the radiation element at one end to the radiation element at the other end in the array direction.
    Type: Grant
    Filed: September 13, 2017
    Date of Patent: April 30, 2019
    Assignee: MURATA MANUFACTURING CO., LTD.
    Inventors: Kazunari Kawahata, Ryuken Mizunuma
  • Publication number: 20190058251
    Abstract: A Luneburg lens antenna device includes a Luneburg lens, a plurality of patch antennas, and a plurality of low-frequency antennas. The Luneburg lens is formed in a cylindrical shape and includes three dielectric layers having different dielectric constants and stacked on each other in the radial direction. The plurality of patch antennas respectively include ground electrodes which cover the outer peripheral surface of radiating elements, and form high-frequency MIMO antennas. The plurality of low-frequency antennas are monopole antennas using the ground electrodes, and form low-frequency MIMO antennas.
    Type: Application
    Filed: July 6, 2018
    Publication date: February 21, 2019
    Inventor: Kazunari KAWAHATA
  • Publication number: 20180269586
    Abstract: A Luneburg lens antenna device includes a Luneburg lens and an array antenna. The Luneburg lens is formed in a cylindrical shape, and the Luneburg lens includes three dielectric layers through having different dielectric constants and stacked on each other in the radial direction. The array antenna includes plural antenna elements disposed on an outer peripheral surface of the Luneburg lens and at different positions of focal points in the peripheral direction and in the axial direction of the Luneburg lens. The array antenna is provided in a range which is ½ or smaller of the entire range of the Luneburg lens in the peripheral direction.
    Type: Application
    Filed: May 23, 2018
    Publication date: September 20, 2018
    Inventor: Kazunari Kawahata
  • Publication number: 20180076530
    Abstract: A patch array antenna includes a ground plane and a plurality of radiation elements that are disposed being distanced from the ground plane. A conductive metal member is disposed above a surface on which the plurality of radiation elements are disposed. The metal member overlaps with part of a region of each of the plurality of radiation elements in a direction orthogonal to an array direction of the patch array antenna and does not overlap with the other part of the region, and continuously extends from the radiation element at one end to the radiation element at the other end in the array direction.
    Type: Application
    Filed: September 13, 2017
    Publication date: March 15, 2018
    Inventors: Kazunari Kawahata, Ryuken Mizunuma
  • Patent number: 9350073
    Abstract: Provided is a MEMS module that includes a MEMS element having a first capacitor electrode that can be displaced, a second capacitor electrode that opposes the first capacitor electrode, and driving electrodes that cause the first capacitor electrode to be displaced. The driving electrodes are connected to a control unit that applies a driving voltage to the driving electrodes and monitor terminals for detecting power. Thus, an element for monitoring power is not needed and a MEMS module, a variable reactance circuit and an antenna device are provided that are capable of realizing smaller size and lower loss.
    Type: Grant
    Filed: July 8, 2013
    Date of Patent: May 24, 2016
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kazunari Kawahata, Hiroshi Nishida, Hiroshi Nishikawa, Toshiya Kawate
  • Patent number: 8643557
    Abstract: An antenna apparatus and a radio communication apparatus are capable of separately controlling a resonance frequency in a basic mode and a resonance frequency in a higher mode and have a wide bandwidth in which the resonance frequency in the basic mode is variable. The antenna apparatus includes a feeding electrode 2, a loop-shaped radiation electrode 3, a capacitance portion 4, and inductors 5 and 6. The capacitance portion 4 is formed by a gap between an open end 3a of the loop-shaped radiation electrode 3 and the feeding electrode 2. The inductor 5 is disposed at a position where a large current is obtained in the basic mode and a small current is obtained in the higher mode. The inductor 6 is disposed at a position where a large current is obtained in the higher mode and a small current is obtained in the basic mode.
    Type: Grant
    Filed: February 23, 2010
    Date of Patent: February 4, 2014
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Shinichi Nakano, Kazunari Kawahata, Nobuhito Tsubaki, Kenichi Ishizuka, Shigeyuki Fujieda
  • Publication number: 20130293432
    Abstract: Provided is a MEMS module that includes a MEMS element having a first capacitor electrode that can be displaced, a second capacitor electrode that opposes the first capacitor electrode, and driving electrodes that cause the first capacitor electrode to be displaced. The driving electrodes are connected to a control unit that applies a driving voltage to the driving electrodes and monitor terminals for detecting power. Thus, an element for monitoring power is not needed and a MEMS module, a variable reactance circuit and an antenna device are provided that are capable of realizing smaller size and lower loss.
    Type: Application
    Filed: July 8, 2013
    Publication date: November 7, 2013
    Inventors: Kazunari KAWAHATA, Hiroshi NISHIDA, Hiroshi NISHIKAWA, Toshiya KAWATE
  • Publication number: 20130285875
    Abstract: A multi-band antenna device includes a frequency variable circuit, a first radiating element used in a first frequency band, a second radiating element used in a second frequency band lower than the first frequency band, and a power supply circuit. The frequency variable circuit includes a parallel resonant circuit in which a capacitor and an inductor are connected in parallel, and a first variable capacitance element connected in parallel with the capacitor. An end of the parallel resonant circuit and the first variable capacitance element are connected to the power supply circuit and the first radiating element. Another end of the parallel resonant circuit and the first variable capacitance element are connected to the second radiating element. The parallel resonant circuit has a resonant frequency closer to the first frequency band than to the second frequency band.
    Type: Application
    Filed: June 26, 2013
    Publication date: October 31, 2013
    Inventor: Kazunari KAWAHATA
  • Patent number: 8508420
    Abstract: An antenna device and a wireless communication apparatus that are capable of obtaining a plurality of resonant frequencies and varying the plurality of resonant frequencies over a wide range are provided. A first antenna unit of an antenna device includes a feed electrode, a first radiation electrode, and a first frequency-variable circuit. The first frequency-variable circuit includes first and second reactance circuits each including a variable-capacitance diode. A control voltage is applied to the first frequency-variable circuit, and the resonant frequency of the first antenna unit can thus be varied. A second antenna unit includes the feed electrode, a second radiation electrode, and a second frequency-variable circuit. The second frequency-variable circuit includes first and third reactance circuits each including a variable-capacitance diode. A control voltage is applied to the second frequency-variable circuit, and the resonant frequency of the second antenna unit can thus be varied.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: August 13, 2013
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Shigeyuki Fujieda, Kazunari Kawahata, Kenichi Ishizuka
  • Patent number: 8279121
    Abstract: A compact and low-cost antenna device in which no interference occurs even when many antenna units corresponding to various systems are mounted close together in a small area, and a wireless communication apparatus including the antenna device. An antenna device includes plural antenna units mounted on a single dielectric base. A first antenna unit having a lowest fundamental frequency is disposed at a left end of a non-ground region, a second antenna unit having a highest fundamental frequency of the plurality of the antenna units is disposed at a right end of the non-ground region, and a third antenna unit having a fundamental frequency between those of the first antenna unit and the second antenna unit is disposed between the first and second antenna units. A current-density control coil is connected between a first radiation electrode and a power feeder of the first antenna unit, while a reactance circuit is disposed in the middle of the first radiation electrode.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: October 2, 2012
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Kenichi Ishizuka, Kazunari Kawahata, Nobuhito Tsubaki, Shigeyuki Fujieda, Shinichi Nakano
  • Patent number: 8199057
    Abstract: An antenna device capable of not only achieving multiple resonances and wideband characteristics but also achieving improvement of antenna efficiency and accurate matching at all resonant frequencies, and a wireless communication apparatus. In one example, an antenna device 1 includes a radiation electrode 2 to which power is capacitively fed through a capacitor portion C1, and additional radiation electrodes 3-1 to 3-3 branched from the radiation electrode 2. A distal end portion 2a of the radiation electrode 2 is grounded to a ground region 402, and is a portion at which a minimum voltage is obtained when power is fed. A capacitor portion C2 that is a portion at which a maximum voltage is obtained when power is fed is disposed in a proximal end portion 2b of the radiation electrode 2, and a variable capacitance element 4 which is grounded is connected in series with the capacitor portion C2.
    Type: Grant
    Filed: January 27, 2009
    Date of Patent: June 12, 2012
    Assignee: Murata Manufactruing Co., Ltd.
    Inventors: Kenichi Ishizuka, Kazunari Kawahata, Nobuhito Tsubaki
  • Publication number: 20120075158
    Abstract: An antenna module is provided and includes two feeding parts and having different frequencies of feeding on a circuit board. A first feeding radiation electrode is connected to the feeding part on a lower frequency side and performs an antenna operation. A second feeding radiation electrode is connected to the feeding part on a higher frequency side and performs an antenna operation. The first and second feeding radiation electrodes electrically connected, and the second feeding radiation electrode is smaller than and on the first feeding radiation electrode with an insulating part therebetween. The first feeding radiation electrode is configured to serve as an electrode that also performs an antenna operation of the second feeding radiation electrode, in such a manner that the second feeding radiation electrode performs an antenna operation in which the second feeding radiation electrode and the first feeding radiation electrode are electrically coupled to each other.
    Type: Application
    Filed: December 2, 2011
    Publication date: March 29, 2012
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventor: Kazunari KAWAHATA
  • Publication number: 20120001821
    Abstract: There is provided an antenna device which has a structure using control lines of an integrated circuit as a portion of an emitting electrode so as to prevent electromagnetic coupling between the emitting electrode and the control lines, and thereby prevent the occurrence of unnecessary resonance and deteriorations in antenna characteristics. Also there is provided a wireless communication device of the same. The antenna device includes at least one emitting electrode and an other emitting electrode provided with the control lines. Connection circuits are provided between the control lines and the other emitting electrode to allow an RF signal of the emitting electrode to flow to the control lines such that the other emitting electrode and the control lines function as a single emitting electrode.
    Type: Application
    Filed: September 16, 2011
    Publication date: January 5, 2012
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Shinichi NAKANO, Kazunari KAWAHATA, Hiroshi NISHIDA, Kenichi ISHIZUKA
  • Patent number: 7940226
    Abstract: A ground electrode is formed on the lower surface of a ferroelectric substrate, a control electrode including capacitor electrodes and an inductor electrode is formed on the upper surface of the ferroelectric substrate, and an upper-surface radiating electrode and an end-surface radiating electrode are formed on a paraelectric substrate. The shapes and dimensions of the ferroelectric substrate, paraelectric substrate, and radiating electrodes are determined such that when the ferroelectric substrate and the paraelectric substrate are stacked in layers, a circuit including the radiating electrodes resonates at frequencies outside a frequency band exhibiting frequency dispersion of a dielectric constant.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: May 10, 2011
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Nobuhito Tsubaki, Kazunari Kawahata
  • Publication number: 20100149053
    Abstract: An antenna apparatus and a radio communication apparatus are capable of separately controlling a resonance frequency in a basic mode and a resonance frequency in a higher mode and have a wide bandwidth in which the resonance frequency in the basic mode is variable. The antenna apparatus includes a feeding electrode 2, a loop-shaped radiation electrode 3, a capacitance portion 4, and inductors 5 and 6. The capacitance portion 4 is formed by a gap between an open end 3a of the loop-shaped radiation electrode 3 and the feeding electrode 2. The inductor 5 is disposed at a position where a large current is obtained in the basic mode and a small current is obtained in the higher mode. The inductor 6 is disposed at a position where a large current is obtained in the higher mode and a small current is obtained in the basic mode.
    Type: Application
    Filed: February 23, 2010
    Publication date: June 17, 2010
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Shinichi NAKANO, Kazunari KAWAHATA, Nobuhito TUBAKI, Kenichi ISHIZUKA, Shigeyuki FUJIEDA
  • Publication number: 20090273531
    Abstract: A compact and low-cost antenna device in which no interference occurs even when many antenna units corresponding to various systems are mounted close together in a small area, and a wireless communication apparatus including the antenna device. An antenna device includes plural antenna units mounted on a single dielectric base. A first antenna unit having a lowest fundamental frequency is disposed at a left end of a non-ground region, a second antenna unit having a highest fundamental frequency of the plurality of the antenna units is disposed at a right end of the non-ground region, and a third antenna unit having a fundamental frequency between those of the first antenna unit and the second antenna unit is disposed between the first and second antenna units. A current-density control coil is connected between a first radiation electrode and a power feeder of the first antenna unit, while a reactance circuit is disposed in the middle of the first radiation electrode.
    Type: Application
    Filed: July 16, 2009
    Publication date: November 5, 2009
    Inventors: Kenichi Ishizuka, Kazunari Kawahata, Nobuhito Tsubaki, Shigeyuki Fujieda, Shinichi Nakano