Patents by Inventor Shinji Matsutaka

Shinji Matsutaka 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).

  • Dual resonance antenna apparatus
    Patent number: 6873299
    Abstract: A multi-resonant antenna device includes an antenna element and an LC parallel resonance circuit making the antenna element resonate in a plurality of frequency bands, and the LC parallel resonance circuit includes a T-type circuit or PI-type circuit including an inductance element, acting as a shunt element, and capacitance elements, which prevent the impedance from becoming infinite in a certain frequency band. In this way, a drop, that is, a notch portion, in the frequency characteristic causing deterioration of the gain can be eliminated.
    Type: Grant
    Filed: December 19, 2002
    Date of Patent: March 29, 2005
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yujiro Dakeya, Shinji Matsutaka
  • Dual resonance antenna apparatus
    Publication number: 20040075614
    Abstract: A multi-resonant antenna device of the present invention contains an antenna element 22 and an LC parallel resonance circuit 31 making the antenna element 22 resonate in a plurality of frequency bands, and the LC parallel resonance circuit 31 contains a T-type circuit or PI-type circuit composed of an inductance element 26, acting as a shunt element, and capacitance elements 29 and 30, which prevents the impedance from becoming infinite in a certain frequency band. In this way, a drop, that is, a notch portion, in the frequency characteristic causing deterioration of the gain can be eliminated.
    Type: Application
    Filed: August 20, 2003
    Publication date: April 22, 2004
    Inventors: Yujiro Dakeya, Shinji Matsutaka