Patents by Inventor Yohei Shirakawa

Yohei Shirakawa 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: 20120154240
    Abstract: An antenna includes an antenna element to transmit or receive electromagnetic signals, and a ground conductor to be grounded. The antenna element includes two conductors arranged substantially parallel to each other, a power feed portion provided between one conductor of the two conductors and the ground conductor, and connected to a feed system, a shorting portion for electrically connecting an other conductor of the two conductors and the ground conductor, and a conductor connecting portion for electrically connecting the two conductors together. The distance between the two conductors is not more than 1/100 a wavelength equivalent to a minimum frequency of operating frequencies of the antenna.
    Type: Application
    Filed: July 19, 2011
    Publication date: June 21, 2012
    Applicant: Hitachi Cable Fine-Tech, Ltd.
    Inventors: Yohei Shirakawa, Kazuhiro Fujimoto, Masamichi Kishi, Naoto Teraki, Yoshitake Ageishi
  • Publication number: 20120032761
    Abstract: There is provided an electromagnetic coupler, which includes: a conductor pattern formed in a first conductor layer; a feed pattern connected to a feeding system and a ground pattern separated from the feed pattern, the feed pattern and the ground pattern being formed in a second conductor layer parallel to the first conductor layer; and a first linear conductor and a plurality of second linear conductors formed perpendicularly to the first and the second conductor layers, the first linear conductor connecting the conductor pattern and the feed pattern, the plurality of second linear conductors connecting the conductor pattern and the ground pattern. In addition, the conductor pattern is symmetrical in shape with respect to the connection point between the conductor pattern and the first linear conductor; and the plurality of second linear conductors are symmetrical in position with respect to the first linear conductor in a planar view.
    Type: Application
    Filed: April 5, 2011
    Publication date: February 9, 2012
    Inventors: Yohei Shirakawa, Naoto Teraki
  • Publication number: 20120007700
    Abstract: There is provided an electromagnetic coupler, which includes: a first conductor pattern and at least one second conductor pattern separated from the first conductor pattern, the first conductor pattern and the at least one second conductor pattern being formed in a first conductor layer; a feed pattern connected to a feeding system and a ground pattern separated from the feed pattern, the feed pattern and the ground pattern being composed of a conductor and formed in a second conductor layer; and a plurality of linear conductors electrically connecting the first conductor pattern with the feed pattern and connecting the second conductor pattern with the ground pattern, the plurality of linear conductors being formed between the first conductor layer and the second conductor layer. Furthermore, the first conductor layer and the second conductor layer are parallel to each other.
    Type: Application
    Filed: April 5, 2011
    Publication date: January 12, 2012
    Inventors: Yohei Shirakawa, Kazuhiro Fujimoto, Masamichi Kishi, Naoto Teraki
  • Publication number: 20110238398
    Abstract: There is provided an electromagnetic coupler that communicates signals by using at least one of a longitudinal electrostatic field and a longitudinal induced electric field. The electromagnetic coupler has a ground conductor, a radiation conductor composed of a plurality of rectangular conductors connected in series, and a feeding point formed at one point in the connection of the plurality of rectangular conductors. The plurality of rectangular conductors are connected such that each pair of adjacent rectangular conductors form an angle other than ? radian, and a length from the feeding point to either end of the radiation conductor is an integral multiple of ?/4 in electrical length with respect to a wavelength ? of a central frequency of a frequency band of interest of the electromagnetic coupler.
    Type: Application
    Filed: March 25, 2011
    Publication date: September 29, 2011
    Inventors: Yohei SHIRAKAWA, Keisuke Fukuchi
  • Publication number: 20110109408
    Abstract: An electromagnetic coupler has a first conductor pattern and a second conductor pattern separated from the first conductor pattern that are formed in a first plane, a feeding pattern made of a conductor and being connected to a feeing system and a ground made of a conductor and being separated from the feeding pattern that are formed in a second plane, and linear conductors electrically connecting between the first conductor pattern and the feeding pattern, and between the second conductor pattern and the ground, respectively.
    Type: Application
    Filed: October 8, 2010
    Publication date: May 12, 2011
    Applicants: Hitachi Cable Fine Tech, Ltd., Hitachi Cable, Ltd.
    Inventors: Yohei Shirakawa, Keisuke Fukuchi, Haruyuki Watanabe
  • Patent number: 7817094
    Abstract: In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable capacitance means connected to this transmission line, and the variable capacitance means controls the resonant frequency.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: October 19, 2010
    Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd., Hitachi Cable, Ltd.
    Inventors: Satoshi Adachi, Makoto Katagishi, Ikuo Murata, Masumi Iwamura, Ken Takei, Takahiro Sugiyama, Yohei Shirakawa
  • Patent number: 7714787
    Abstract: In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable capacitance means connected to this transmission line, and the variable capacitance means controls the resonant frequency.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: May 11, 2010
    Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd., Hitachi Cable, Ltd.
    Inventors: Satoshi Adachi, Makoto Katagishi, Ikuo Murata, Masumi Iwamura, Ken Takei, Takahiro Sugiyama, Yohei Shirakawa
  • Patent number: 7602346
    Abstract: An antenna module formed with an integrated multilayer substrate having: an antenna with a transmission line; a tuned circuit with a variable capacitance means; a low noise amplifier; and a wave-shaping circuit. The variable capacitance means in the tuned circuit controls a resonance frequency of the antenna by an external control signal being wave-shaped by the wave-shaping circuit, and the antenna outputs a high-frequency output tuned to the controlled resonance frequency to the low noise amplifier directly and then the low noise amplifier outputs the amplified high-frequency output to outside.
    Type: Grant
    Filed: October 6, 2006
    Date of Patent: October 13, 2009
    Assignee: Hitachi Cable, Ltd.
    Inventors: Ken Takei, Takahiro Sugiyama, Yohei Shirakawa
  • Publication number: 20080258984
    Abstract: In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable capacitance means connected to this transmission line, and the variable capacitance means controls the resonant frequency.
    Type: Application
    Filed: June 18, 2008
    Publication date: October 23, 2008
    Applicants: HITACHI, LTD., HITACHI MEDIA ELECTRONICS CO., LTD., HITACHI CABLE, LTD.
    Inventors: Satoshi Adachi, Makoto Katagishi, Ikuo Murata, Masumi Iwamura, Ken Takei, Takahiro Sugiyama, Yohei Shirakawa
  • Publication number: 20070080870
    Abstract: An antenna module formed with an integrated multilayer substrate having: an antenna with a transmission line; a tuned circuit with a variable capacitance means; a low noise amplifier; and a wave-shaping circuit. The variable capacitance means in the tuned circuit controls a resonance frequency of the antenna by an external control signal being wave-shaped by the wave-shaping circuit, and the antenna outputs a high-frequency output tuned to the controlled resonance frequency to the low noise amplifier directly and then the low noise amplifier outputs the amplified high-frequency output to outside.
    Type: Application
    Filed: October 6, 2006
    Publication date: April 12, 2007
    Applicant: Hitachi Cable, LTD.
    Inventors: Ken Takei, Takahiro Sugiyama, Yohei Shirakawa
  • Publication number: 20060279469
    Abstract: In an antenna that has high sensitivity to frequencies of narrow bands and over a wide band and that can be small-sized, and in a wireless module, wireless unit and wireless apparatus using this antenna, the antenna is comprised of a transmission line, and variable capacitance means connected to this transmission line, and the variable capacitance means controls the resonant frequency.
    Type: Application
    Filed: June 7, 2006
    Publication date: December 14, 2006
    Inventors: Satoshi Adachi, Makoto Katagishi, Ikuo Murata, Masumi Iwamura, Ken Takei, Takahiro Sugiyama, Yohei Shirakawa