Patents by Inventor Hiroshi Tanpo

Hiroshi Tanpo 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).

  • Filter having switch function and band pass filter
    Patent number: 8072294
    Abstract: The filter has a switch function of selectively transmitting a transmission signal through one of first and second branch waveguides branching from a primary waveguide. The filter includes resonators disposed in the first and second branch waveguides. The resonator includes a space formed inside a metal cover, a central conductor disposed inside the space, and a short-circuiting plate. The central conductor has one end grounded to an outer conductor. The short-circuiting plate allows the neighborhood of an open end of the central conductor to be selectively conducted to the outer conductor. The filter performs a selection from the first and second branch waveguides by switching electrical conductivity in a region between the neighborhood of the open end of the central conductor and the outer conductor.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: December 6, 2011
    Assignees: NEC Corporation, NEC Engineering, Ltd.
    Inventors: Hiroshi Tanpo, Tsuyoshi Hamada
  • FILTER HAVING SWITCH FUNCTION AND BAND PASS FILTER
    Publication number: 20090153264
    Abstract: The filter has a switch function of selectively transmitting a transmission signal through one of first and second branch waveguides branching from a primary waveguide. The filter includes resonators disposed in the first and second branch waveguides. The resonator includes a space formed inside a metal cover, a central conductor disposed inside the space, and a short-circuiting plate. The central conductor has one end grounded to an outer conductor. The short-circuiting plate allows the neighborhood of an open end of the central conductor to be selectively conducted to the outer conductor. The filter performs a selection from the first and second branch waveguides by switching electrical conductivity in a region between the neighborhood of the open end of the central conductor and the outer conductor.
    Type: Application
    Filed: December 5, 2008
    Publication date: June 18, 2009
    Applicants: NEC CORPORATION, NEC ENGINEERING, LTD.
    Inventors: Hiroshi TANPO, Tsuyoshi Hamada