Patents by Inventor Tadeshi Koyama

Tadeshi Koyama 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).

  • Mobile radio device
    Patent number: 8219143
    Abstract: A portable wireless device includes a first communication unit having a loop antenna that communicates with external devices using a first usable frequency band, and an RFID chip that performs predetermined processing with respect to information communicated by the loop antenna. A second communication unit includes a main antenna that communicates by a second usable frequency band that is higher than the first usable frequency band, and a communication processing unit that performs predetermined processing with respect to information communicated by the main antenna. A reactance component of the loop antenna is adjusted such that a high-order secondary resonance point of the first usable frequency band does not overlap the second usable frequency band.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: July 10, 2012
    Assignee: Kyocera Corporation
    Inventors: Kenji Waku, Tadeshi Koyama, Kunihiko Watanabe, Masato Harikae, Shin Takahashi, Daisuke Togashi, Yoshiaki Hiraoka
  • Mobile Radio Device
    Publication number: 20100093390
    Abstract: The present invention provides a portable wireless device that allows for a reduction in size of a body thereof through effective use of space inside the body by suppressing gain degradation of antennae.
    Type: Application
    Filed: September 28, 2007
    Publication date: April 15, 2010
    Applicant: KYOCERA CORPORATION
    Inventors: Kenji Waku, Tadeshi Koyama, Kunihiko Watanabe, Masato Harikae, Shin Takahashi, Daisuke Togashi, Yoshiaki Hiraoka