Patents by Inventor Katsuhisa Yabe

Katsuhisa Yabe 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).

  • Electronic apparatus and wireless communication system
    Publication number: 20030032396
    Abstract: The invention is provided to improve the power efficiency of a power amplifier circuit of a wireless communication system having an output transistor that operates in saturation operation mode and linear operation mode. The invention provides an electronic apparatus (module) used for a wireless communication system in which at least an output power amplifiers and an impedance matching circuit are mounted on one insulating substrate and the impedance of the output terminal of the impedance matching circuit is set to 50&OHgr;, wherein a switching circuit that changes the circuit constant of the impedance matching circuit or the high frequency impedance value in view of the impedance matching circuit side from the output power amplifier depending on the operation condition is provided at the point of the impedance lower than the impedance of the output terminal in the impedance marching circuit.
    Type: Application
    Filed: June 20, 2002
    Publication date: February 13, 2003
    Inventors: Masahiro Tsuchiya, Tsuyoshi Shibuya, Katsuhisa Yabe, Kazuhiro Takahashi