Patents by Inventor Jyunichi Yoshizumi

Jyunichi Yoshizumi 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).

  • Transmitting/receiving switch
    Patent number: 7127215
    Abstract: A transmitting/receiving switch, in which a transmission terminal connected to a transmission circuit is connected to an antenna terminal through a first switching element, a filter for attenuating harmonic contents in a transmission signal, a phase-shift circuit for significantly increasing an impedance from a node toward said transmission terminal in a reception frequency band by phase-adjusting the amount of phase shift by performing phase adjustment according to the amount of the phase shift generated by said filter. Furthermore, the antenna terminal connected to an antenna ANT is connected to a reception terminal through the node and a second switching element, and the reception terminal is connected to a reception circuit Rx.
    Type: Grant
    Filed: October 22, 1999
    Date of Patent: October 24, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Nakamura, Makoto Sakakura, Toshio Ishizaki, Jyunichi Yoshizumi
  • TRANSMITTING/RECEIVING SWITCH AND PORTABLE TERMINAL UNIT
    Publication number: 20030119455
    Abstract: A transmitting/receiving switch, in which a transmission terminal connected to a transmission circuit is connected to an antenna terminal through a first switching element, a filter for attenuating harmonic contents in a transmission signal, a phase-shift circuit for significantly increasing an impedance from a node toward said transmission terminal in a reception frequency band by phase-adjusting the amount of phase shift by performing phase adjustment according to the amount of the phase shift generated by said filter. Furthermore, the antenna terminal connected to an antenna ANT is connected to a reception terminal through the node and a second switching element, and the reception terminal is connected to a reception circuit Rx.
    Type: Application
    Filed: October 22, 1999
    Publication date: June 26, 2003
    Inventors: HIROYUKI NAKAMURA, MAKOTO SAKAKURA, TOSHIO ISHIZAKI, JYUNICHI YOSHIZUMI
  • Transmission system, transmission/reception system, and local oscillator to be used in the same
    Patent number: 6347219
    Abstract: A method for generating a local oscillation signal comprising two separate frequency converters, of which one frequency converter includes an output unit for generating an internal output signal to be used for its frequency conversion, and the other frequency converter employs the same internal output signal from the output unit as the local oscillation signal.
    Type: Grant
    Filed: August 11, 1999
    Date of Patent: February 12, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Koji Takinami, Hisashi Adachi, Hiroaki Kosugi, Ikuo Ohta, Jyunichi Yoshizumi, Toshiaki Nakamura