Patents by Inventor Manabu Kai

Manabu Kai 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: 20190214726
    Abstract: An antenna device includes a ground plane having an edge side, a monopole antenna element that communicates in a first frequency, and that has a first feeding point, a first line that extends from the first feeding point in a direction away from the edge side of the ground plane, and a second line that is coupled to the first line and extends along the edge side, a plurality of dipole feeding elements that communicate at a second frequency higher than the first frequency, and are disposed, with respect to the ground plane, in positions that match the positions of the second line with respect to the ground plane, and a plurality of reflectors that reflect electromagnetic waves radiated by the plurality of feeding elements, and are disposed respectively in correspondence to the plurality of feeding elements between the ground plane and the plurality of feeding elements.
    Type: Application
    Filed: December 20, 2018
    Publication date: July 11, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Takashi YAMAGAJO, Manabu Kai, Yohei Koga, Tablto Tonooka, Hirotake Sumi
  • Publication number: 20190214725
    Abstract: A multiband antenna includes a ground conductor, a first conductor disposed at a predetermined distance from the ground conductor, formed linearly, and configured to have a length to resonate at first and second frequencies, the first conductor including a power feeding point, a second conductor coupled to the first conductor at both ends of the second conductor, disposed closer to a side of the ground conductor than the first conductor, formed linearly, and configured to form a slit between the first and second conductors and resonate together with the first conductor at a third frequency, and a third conductor provided at one or more ends of the first conductor and configured to extend from a first end of the one or more ends to the side of the ground conductor to be electromagnetically coupled to the ground conductor at the third frequency, wherein the conductors has conductivity.
    Type: Application
    Filed: March 18, 2019
    Publication date: July 11, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Yohei KOGA, Manabu KAI, Masatomo MORI, Tabito TONOOKA, Takashi YAMAGAJO
  • Publication number: 20190190124
    Abstract: An antenna device includes: a ground plane which has an edge side; a metal member arranged along the edge side of the ground plane; a first connection line which couples the metal member and the ground plane; a second connection line which couples the metal member and the ground plane; and a power feeding element which has a power feeding point, extends along the metal member from the power feeding point between the first connection line and the second connection line, and is electromagnetic-field-coupled to the metal member.
    Type: Application
    Filed: February 26, 2019
    Publication date: June 20, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Yohei KOGA, Takashi YAMAGAJO, Manabu KAI, Tabito TONOOKA
  • Publication number: 20190190121
    Abstract: An antenna apparatus includes a ground conductor, an antenna element including an antenna that is parallel to the ground conductor and that has a first end portion and a second end portion, a feed line that is coupled to the first end portion of the antenna and that feeds the antenna through the ground conductor, and a short-circuit line that is coupled to the first end portion of the antenna and that electrically short-circuits the antenna to the ground conductor, and a dummy conductor mounted between the first end portion or the second end portion of the antenna and the ground conductor.
    Type: Application
    Filed: December 17, 2018
    Publication date: June 20, 2019
    Applicant: FUJITSU LIMITED
    Inventor: Manabu Kai
  • Publication number: 20190173180
    Abstract: A wireless communication device includes a loop antenna that includes first to fourth terminals, the loop antenna having a first inductance, a first communication circuit that is coupled between the first and third terminals and has a first impedance, the first communication circuit resonating at a first frequency with the loop antenna, a coil that is coupled between the second and fourth terminals and has a second inductance higher than the first inductance, a capacitance that is coupled between the second and fourth terminals in parallel to the coil and has an electrostatic capacitance having a complex conjugate relationship with a second inductance of the coil, and a second communication circuit that is coupled between the second and fourth terminals and has a second impedance lower than the first impedance, the second communication circuit performing a communication at a second frequency via the loop antenna.
    Type: Application
    Filed: November 19, 2018
    Publication date: June 6, 2019
    Applicant: FUJITSU LIMITED
    Inventor: Manabu Kai
  • Publication number: 20190131927
    Abstract: A sunlight receiving device includes a substrate, and a plurality of resonators arranged on a surface of the substrate at certain intervals so as to form one of a plurality of loops, the plurality of loops partially bordering with each other, each one of the plurality of resonators having a length that resonates with sunlight of a certain wavelength, wherein energy of the sunlight is obtained via a resonator that belongs to one or more of the plurality of loops, the resonator being one of the plurality of resonators.
    Type: Application
    Filed: December 20, 2018
    Publication date: May 2, 2019
    Applicant: FUJITSU LIMITED
    Inventor: Manabu KAI
  • Publication number: 20190074581
    Abstract: An antenna includes, a radiation conductor that is fed by one end, has another end serving as an opened end, and emits or receives radio waves, a first grounding conductor that is installed at the one end side of the radiation conductor and is grounded, a second grounding conductor that is electrically coupled with the first grounding conductor and is formed in a cylindrical shape around the radiation conductor with an elongation direction of the radiation conductor as an axial direction. At least one of the first grounding conductor and the second grounding conductor is electric-field coupled with a conductor where the antenna is installed.
    Type: Application
    Filed: August 24, 2018
    Publication date: March 7, 2019
    Applicant: FUJITSU LIMITED
    Inventors: Yasumitsu BAN, Manabu Kai
  • Publication number: 20180366827
    Abstract: A loop antenna includes: a substrate; a feeding element including a first portion and a second portion which are provided on a first surface of the substrate, have electrical conductivity, are fed with electric power from a feeding point, the first portion extending from the feeding point in a first direction, the second portion extending from the feeding point in a second direction; and an emitting element which has electrical conductivity, is formed in a loop shape in such a manner that the emitting element surrounds the substrate along a surface perpendicular to the first surface, and includes a first end provided so as to electromagnetically couple to the first portion on the first surface and a second end provided so as to electromagnetically couple to the second portion on the first surface, a gap being disposed between the first end and the second end.
    Type: Application
    Filed: May 31, 2018
    Publication date: December 20, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Takashi YAMAGAJO, Manabu Kai
  • Publication number: 20180358700
    Abstract: An antenna device includes: a ground plane having an edge; a matching circuit; and a T-shaped antenna element including a first element and a second element extending from a feed point to a first and second end parts. The first element has a resonance frequency that is higher than a first frequency. The second element has a resonance frequency between a second frequency and a third frequency. A first value obtained by dividing a length from a corresponding point to a first bend part by the first wavelength is less than or equal to a second value obtained by dividing a length from the corresponding point to a second bend part by the second wavelength. An imaginary component of an impedance of the matching circuit takes a positive value at the first frequency and the second frequency and takes a negative value at the third frequency.
    Type: Application
    Filed: July 26, 2018
    Publication date: December 13, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Takashi YAMAGAJO, Yohei Koga, Manabu Kai, Tabito Tonooka, Minoru Sakurai, Mitsuharu Hoshino
  • Patent number: 10119458
    Abstract: A vehicle includes a frame supporting an engine, a transmission including an input shaft and an output shaft, a driving device linked to the output shaft so that power is transmitted therebetween, and a supercharger including a rotation shaft linked to the output shaft so that power is transmitted therebetween. The supercharger is fixed to the frame.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: November 6, 2018
    Assignee: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Manabu Kai, Akihiko Nakamura
  • Publication number: 20180287249
    Abstract: An antenna apparatus includes: a ground plane having a slit extending from an edge to an inside first point and extending, along the edge, to a second point; a first antenna element having a first feed point and a first open end, the first feed point being arranged at an opposite side of an area surrounded by the slit and the edge with respect to the slit, the first antennae element extending from the first feed point to a first bend part at a first height position and extending to the first open end; and a second antenna element having a second feed point, arranged in the area, and a second open end, and extending from the second feed point to a second bend part at a second height position, extending to the second open end, and crossing, at a second open end side, the slit.
    Type: Application
    Filed: March 6, 2018
    Publication date: October 4, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Takashi YAMAGAJO, Yohei Koga, Manabu Kai, Masatomo Mori, Tabito Tonooka, Mitsuharu Hoshino
  • Patent number: 10030577
    Abstract: A vehicle includes a transmission including an input shaft linked to a crankshaft of an engine so that power is transmitted therebetween, and an output shaft which is able to rotate at a rotational speed lower than a rotational speed of the input shaft. The snowmobile includes a driving device linked to the output shaft so that power is transmitted therebetween to generate a driving power, a supercharger including a rotation shaft linked to the output shaft so that power is transmitted therebetween, and a centrifugal clutch located between the crankshaft and the input shaft or between the output shaft and the rotation shaft.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: July 24, 2018
    Assignee: YAMAHA HATSUDOKI KABUSHIKI KAISHA
    Inventors: Manabu Kai, Akihiko Nakamura
  • Publication number: 20180183149
    Abstract: An antenna apparatus includes a ground plane having an edge; a monopole type first antenna element having a first feed point and configured to communicate at a first frequency; and a monopole type second antenna element having a second feed point and configured to communicate at a second frequency, the second antenna element extending from the second feed point in a direction away from the edge. An end portion of the first antenna element is arranged closer to the ground plane than an end portion of the second antenna element is. A length of an interval between the first feed point and the second feed point is in a range of from 0.25-fold to 0.7-fold of an electrical length of a first wavelength at the first frequency. A length of the second antenna element is a length in a range of from 0.15-fold to 0.55-fold of the electrical length.
    Type: Application
    Filed: December 5, 2017
    Publication date: June 28, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Yohei KOGA, Takashi YAMAGAJO, Manabu KAI, Mitsuharu HOSHINO, Masatomo MORI
  • Publication number: 20180097276
    Abstract: An antenna apparatus includes a ground plane having an edge; a feed element having a feed point located close to the edge and a first open end, the feed element extending from the feed point to the first open end and serving as an inductor; a parasitic element having a second open end disposed a predetermined distance away from the first open end and a connection end connected to the edge, the parasitic element extending from the connection end to the second open end, a length from the connection end to the second open end being set to be a quarter wavelength of an electrical length of a wavelength in a communication frequency; and a metal member disposed between the first second open ends via a predetermined interval to cover the first and second open ends to constitute a predetermined capacity between the first and second open ends.
    Type: Application
    Filed: September 15, 2017
    Publication date: April 5, 2018
    Applicant: FUJITSU LIMITED
    Inventors: Takashi Yamagajo, Manabu Kai
  • Patent number: 9922283
    Abstract: An RFID tag includes: a base portion in a plate shape made of dielectric material; a loop antenna formed by etching and including a first antenna element and a second antenna element disposed in a loop shape along an outer periphery of the base portion; and an IC chip inserted to the loop antenna in series and including a first electrode and a second electrode.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: March 20, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Manabu Kai
  • Patent number: 9831556
    Abstract: A planar antenna includes a substrate formed of a dielectric; a distributed constant line formed on a first surface of the substrate, the distributed constant line including a first end to which power is supplied and a second end that is an open end or is grounded; and at least one first resonator arranged on the first surface of the substrate and within a range in which the at least one first resonator is allowed to be electromagnetically coupled to the distributed constant line in a vicinity of any of nodal points of a standing wave of a current that flows through the distributed constant line in response to a radio wave having a certain design wavelength radiated from the distributed constant line or received by the distributed constant line.
    Type: Grant
    Filed: October 31, 2014
    Date of Patent: November 28, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Takashi Yamagajo, Manabu Kai, Andrey S. Andrenko
  • Patent number: 9819087
    Abstract: A planar antenna includes: first and second conductors each of which forms a microstrip line in combination with a ground electrode, and which are arranged in parallel with each other on a substrate; a plurality of first resonators disposed between the first conductor and the second conductor which electromagnetically couple the first conductor at one longitudinal end of each of the first resonators to generate electric fields which are in phase with each other; and at least one second resonator disposed between the first conductor and the second conductor which electromagnetically couples the second conductor at one longitudinal end of the at least one second resonator to generate an electric field which is in phase with the electric fields generated by the plurality of first resonators, wherein the at least one second resonator is arranged alternately with the plurality of first resonators.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: November 14, 2017
    Assignees: FUJITSU LIMITED, FUJITSU FRONTECH LIMITED
    Inventors: Takashi Yamagajo, Manabu Kai, Masahiko Shimizu, Yusuke Kawasaki
  • Publication number: 20170300801
    Abstract: An RFID tag includes: a base portion in a plate shape made of dielectric material; a loop antenna formed by etching and including a first antenna element and a second antenna element disposed in a loop shape along an outer periphery of the base portion; and an IC chip inserted to the loop antenna in series and including a first electrode and a second electrode.
    Type: Application
    Filed: February 17, 2017
    Publication date: October 19, 2017
    Applicant: FUJITSU LIMITED
    Inventor: Manabu Kai
  • Publication number: 20170235869
    Abstract: A non-transitory computer-readable storage medium storing an antenna design program that causes a computer to execute a process, the process including acquiring a target characteristic value of a target antenna when a value of a structure parameter is a predetermined value, based on the predetermined value of the structure parameter, the target characteristic value, and a relation, with respect to a reference antenna, between a value of a structure parameter and a characteristic value, estimating the relation with respect to the target antenna, the reference antenna having a same shape feature as the target antenna, an antenna type of the reference antenna being different from the target antenna, determining a value of the structure parameter for the target antenna such that the characteristic value of the target antenna satisfies a demanded specification based on the estimated relation, and outputting the determined value of the structure parameter.
    Type: Application
    Filed: February 8, 2017
    Publication date: August 17, 2017
    Inventors: Yohei KOGA, Manabu KAI, Takashi YAMAGAJO, Yasumitsu BAN, Hiroyuki EGAWA, Kan FUJIEDA
  • Patent number: 9703997
    Abstract: An RFID tag includes a base part, a loop antenna around the base part including a first antenna element and a second antenna element, and a loop-length shorter than a wavelength of a resonant frequency, and an IC chip at a first surface side of the base part. The IC chip is connected between a first terminal disposed on a first end of the first antenna element and a second terminal disposed on a first end of the second antenna element. The loop antenna includes an overlapping part at a second surface side of the base part, and a capacitance of the overlapping part is adjusted such that a difference between an imaginary component of a first synthetic impedance and an imaginary component of a second synthetic impedance is less than or equal to a predetermined value.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: July 11, 2017
    Assignee: FUJITSU LIMITED
    Inventor: Manabu Kai