Patents by Inventor Katuhiko Kawashima

Katuhiko Kawashima 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).

  • Radio frequency power amplifier
    Patent number: 7449957
    Abstract: A radio frequency signal RF is input to a base of each of transistors TR1 through TRn via a corresponding capacitor among capacitors C1 through Cn, is amplified, and is output from a collector of each of the transistors TR1 through TRn. An emitter of each of the transistors TR1 through TRn is grounded. A bias voltage DC given from a bias circuit Bias is supplied to the base of each of the transistors TR1 through TRn via a corresponding resistor among resistors Ra1 through Ran. A signal line for the bias voltage DC is connected to an input line for the radio frequency signal RF via the bridge resistor R in a direct current manner.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: November 11, 2008
    Assignee: Panasonic Corporation
    Inventors: Shingo Enomoto, Masahiko Inamori, Haruhiko Koizumi, Kazuki Tateoka, Hirokazu Makihara, Shingo Matuda, Katuhiko Kawashima
  • Radio frequency power amplifier
    Publication number: 20060261897
    Abstract: A radio frequency signal RF is input to a base of each of transistors TR1 through TRn via a corresponding capacitor among capacitors C1 through Cn, is amplified, and is output from a collector of each of the transistors TR1 through TRn. An emitter of each of the transistors TR1 through TRn is grounded. A bias voltage DC given from a bias circuit Bias is supplied to the base of each of the transistors TR1 through TRn via a corresponding resistor among resistors Ra1 through Ran. A signal line for the bias voltage DC is connected to an input line for the radio frequency signal RF via the bridge resistor R in a direct current manner.
    Type: Application
    Filed: May 18, 2006
    Publication date: November 23, 2006
    Inventors: Shingo Enomoto, Masahiko Inamori, Haruhiko Koizumi, Kazuki Tateoka, Hirokazu Makihara, Shingo Matuda, Katuhiko Kawashima