Patents by Inventor Daiki KASUGAI

Daiki KASUGAI 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).

  • Amplification device, radio communication apparatus, and amplification control method
    Patent number: 10622953
    Abstract: An amplification device includes a plurality of amplifiers arranged in parallel, a plurality of directional couplers coupled to the plurality of amplifiers, respectively, and configured to receive output signals of the plurality of amplifiers, respectively, a phase shifter coupled to a first directional coupler of the plurality of directional couplers, and configured to generate a first signal to which a phase of an output signal of the first directional coupler is inverted, a combining circuit coupled to the phase shifter and a second directional coupler of the plurality of directional couplers, and configured to combine an output signal of the phase shifter and an output signal of the second directional coupler, and a processor configured to control at least one of the plurality of amplifiers so that a level of an output signal of the combining circuit is minimized.
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: April 14, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Osamu Kuroda, Takumi Takayashiki, Yuuji Osada, Daiki Kasugai
  • AMPLIFICATION DEVICE, RADIO COMMUNICATION APPARATUS, AND AMPLIFICATION CONTROL METHOD
    Publication number: 20200106402
    Abstract: An amplification device includes a plurality of amplifiers arranged in parallel, a plurality of directional couplers coupled to the plurality of amplifiers, respectively, and configured to receive output signals of the plurality of amplifiers, respectively, a phase shifter coupled to a first directional coupler of the plurality of directional couplers, and configured to generate a first signal to which a phase of an output signal of the first directional coupler is inverted, a combining circuit coupled to the phase shifter and a second directional coupler of the plurality of directional couplers, and configured to combine an output signal of the phase shifter and an output signal of the second directional coupler, and a processor configured to control at least one of the plurality of amplifiers so that a level of an output signal of the combining circuit is minimized.
    Type: Application
    Filed: September 6, 2019
    Publication date: April 2, 2020
    Applicant: FUJITSU LIMITED
    Inventors: Osamu KURODA, Takumi TAKAYASHIKI, Yuuji OSADA, Daiki KASUGAI