Patents by Inventor Hiroyuki Nakamatsu

Hiroyuki Nakamatsu 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).

  • In-band-flat-group-delay type dielectric filter and linearized amplifier using the same
    Patent number: 6995636
    Abstract: A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators are coupled to one another, and input/output terminals connected to ends of the coupling circuit. The dielectric coaxial resonators coupled to the input/output terminals are allowed to have a different characteristic impedance from that of the inter-stage dielectric coaxial resonators.
    Type: Grant
    Filed: January 16, 2004
    Date of Patent: February 7, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Minoru Tachibana, Toshiaki Nakamura, Hiroyuki Nakamatsu
  • In-band-flat-group-delay type dielectric filter and linearized amplifier using the same
    Patent number: 6794959
    Abstract: A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators are coupled to one another, and input/output terminals connected to ends of the coupling circuit. The dielectric coaxial resonators coupled to the input/output terminals are allowed to have a different characteristic impedance from that of the inter-stage dielectric coaxial resonators.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: September 21, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Minoru Tachibana, Toshiaki Nakamura, Hiroyuki Nakamatsu
  • In-band-flat-group-delay type dielectric filter and linearized amplifier using the same
    Publication number: 20040145432
    Abstract: A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators are coupled to one another, and input/output terminals connected to ends of the coupling circuit. The dielectric coaxial resonators coupled to the input/output terminals are allowed to have a different characteristic impedance from that of the inter-stage dielectric coaxial resonators.
    Type: Application
    Filed: January 16, 2004
    Publication date: July 29, 2004
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Minoru Tachibana, Toshiaki Nakamura, Hiroyuki Nakamatsu
  • In-band-flat-group-delay type dielectric filter and linearized amplifier using the same
    Publication number: 20030052751
    Abstract: A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators are coupled to one another, and input/output terminals connected to ends of the coupling circuit. The dielectric coaxial resonators coupled to the input/output terminals are allowed to have a different characteristic impedance from that of the inter-stage dielectric coaxial resonators.
    Type: Application
    Filed: October 25, 2002
    Publication date: March 20, 2003
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Minoru Tachibana, Toshiaki Nakamura, Hiroyuki Nakamatsu
  • In-band-flat-group-delay type dielectric filter and linearized amplifier using the same
    Patent number: 6515559
    Abstract: A small in-band-flat-group-delay type dielectric filter having low-loss characteristics with a small amplitude deviation and uniform-group-delay frequency characteristics is obtained, which enables broad-band characteristics to be obtained easily. The in-band-flat-group-delay type dielectric filter includes a plurality of dielectric coaxial resonators, a coupling circuit comprising a combination of reactive elements, with which the dielectric coaxial resonators are coupled to one another, and input/output terminals connected to ends of the coupling circuit. The dielectric coaxial resonators coupled to the input/output terminals are allowed to have a different characteristic impedance from that of the inter-stage dielectric coaxial resonators.
    Type: Grant
    Filed: July 18, 2000
    Date of Patent: February 4, 2003
    Assignee: Matsushita Electric Industrial Co., Ltd
    Inventors: Takehiko Yamakawa, Toru Yamada, Toshio Ishizaki, Minoru Tachibana, Toshiaki Nakamura, Hiroyuki Nakamatsu