Patents by Inventor Fumitake Kawanabe

Fumitake Kawanabe 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).

  • High frequency power amplifier
    Patent number: 7719364
    Abstract: A high frequency power amplifier includes an amplifying device for amplifying an input high frequency signal, a harmonic reflection circuit for reflecting a harmonic outputted from the amplifying device, and a harmonic generating circuit provided at an input terminal of the amplifying device, the harmonic generating circuit including a divider for dividing an input signal of a fundamental wave into two parts, a harmonic generator for generating a second harmonic from one part of the fundamental wave signal, and a combiner for combining the second harmonic generated from the harmonic generator with the other part of the fundamental wave signal to offer a combined signal to the amplifying device, wherein the harmonic reflection circuit reflects the second harmonic.
    Type: Grant
    Filed: February 12, 2009
    Date of Patent: May 18, 2010
    Assignee: Hitachi Kokusai Electric Inc.
    Inventors: Fumitake Kawanabe, Yoichi Okubo, Yasuo Sera, Manabu Nakamura, Toshio Nojima, Taizo Ito
  • High frequency power amplifier
    Publication number: 20090201089
    Abstract: A high frequency power amplifier includes an amplifying device for amplifying an input high frequency signal, a harmonic reflection circuit for reflecting a harmonic outputted from the amplifying device, and a harmonic generating circuit provided at an input terminal of the amplifying device, the harmonic generating circuit including a divider for dividing an input signal of a fundamental wave into two parts, a harmonic generator for generating a second harmonic from one part of the fundamental wave signal, and a combiner for combining the second harmonic generated from the harmonic generator with the other part of the fundamental wave signal to offer a combined signal to the amplifying device, wherein the harmonic reflection circuit reflects the second harmonic.
    Type: Application
    Filed: February 12, 2009
    Publication date: August 13, 2009
    Applicant: Hitachi Kokusai Electric Inc.
    Inventors: Fumitake Kawanabe, Yoichi Okubo, Yasuo Sera, Manabu Nakamura, Toshio Nojima, Taizo Ito