Patents by Inventor Shotaro Nishimura

Shotaro Nishimura 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).

  • Antenna device
    Publication number: 20070182634
    Abstract: Four antenna units arranged adjacent to each other are respectively connected to switches, and are connected to load impedance elements via the switches, or connected to an output terminal and a comparator via a switch. Another ends of the load impedance elements are grounded. The comparator judges which antenna unit receives a radio signal having the maximum signal level among the antenna units. A controller controls the switches and the switch so that the antenna unit that receives the radio communication signal having the maximum signal level is connected to the output terminal and the other antenna units are connected to the load impedance elements.
    Type: Application
    Filed: October 28, 2004
    Publication date: August 9, 2007
    Inventors: Atsushi Yamamoto, Hiroshi Iwai, Koichi Ogawa, Shotaro Nishimura, Hirotaka Ishihara
  • Radio antenna apparatus provided with controller for controlling SAR and radio communication apparatus using the same radio antenna apparatus
    Patent number: 6985113
    Abstract: A radio antenna apparatus is provided with an antenna connected with a radio communication circuit that transmits and receives a radio signal. A load impedance element is connected between a parasitic element of an electrical conductor plate and a ground of a housing of a radio communication apparatus including the radio communication circuit. A controller controls an element value of the load impedance element so as to set a current flowing on the housing to be equal to or smaller than a predetermined value when the radio communication apparatus transmits the radio signal, thereby controlling a specific absorption rate (SAR) to be equal to or smaller than a predetermined value.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: January 10, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shotaro Nishimura, Atsushi Yamamoto, Koichi Ogawa, Hiroshi Iwai
  • Radio antenna apparatus provided with controller for controlling SAR and radio communication apparatus using the same radio antenna apparatus
    Publication number: 20040248523
    Abstract: A radio antenna apparatus is provided with an antenna connected with a radio communication circuit that transmits and receives a radio signal. A load impedance element is connected between a parasitic element of an electrical conductor plate and a ground of a housing of a radio communication apparatus including the radio communication circuit. A controller controls an element value of the load impedance element so as to set a current flowing on the housing to be equal to or smaller than a predetermined value when the radio communication apparatus transmits the radio signal, thereby controlling a specific absorption rate (SAR) to be equal to or smaller than a predetermined value.
    Type: Application
    Filed: April 15, 2004
    Publication date: December 9, 2004
    Inventors: Shotaro Nishimura, Atsushi Yamamoto, Koichi Ogawa, Hiroshi Iwai