Patents by Inventor Katsuhito OMOTE

Katsuhito OMOTE 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).

  • Elastic-wave filter device having a band-pass filter and a band-reject filter
    Patent number: 8410869
    Abstract: In an elastic-wave filter device that includes a band-pass filter and a band-eliminate filter connected to the band-pass filter, insertion loss in a pass band is significantly reduced and attenuation in a stop band is significantly increased. The elastic-wave filter device has a pass band and a stop band at frequencies higher than the pass band. The band-pass filter and the first band-eliminate filter are connected in series between an input terminal and an output terminal. A first parallel-arm resonator of the first band-eliminate filter includes a first resonance frequency in the stop band. A second parallel-arm resonator includes a second resonance frequency in the stop band, the second resonance frequency being higher than the first resonance frequency. An impedance value of the first parallel-arm resonator is larger than an impedance value of the second parallel-arm resonator.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: April 2, 2013
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Katsuhito Omote, Yoshihiro Iwasaki
  • ELASTIC-WAVE FILTER DEVICE
    Publication number: 20120306595
    Abstract: In an elastic-wave filter device that includes a band-pass filter and a band-eliminate filter connected to the band-pass filter, insertion loss in a pass band is significantly reduced and attenuation in a stop band is significantly increased. The elastic-wave filter device has a pass band and a stop band at frequencies higher than the pass band. The band-pass filter and the first band-eliminate filter are connected in series between an input terminal and an output terminal. A first parallel-arm resonator of the first band-eliminate filter includes a first resonance frequency in the stop band. A second parallel-arm resonator includes a second resonance frequency in the stop band, the second resonance frequency being higher than the first resonance frequency. An impedance value of the first parallel-arm resonator is larger than an impedance value of the second parallel-arm resonator.
    Type: Application
    Filed: August 20, 2012
    Publication date: December 6, 2012
    Applicant: MURATA MANUFACTURING CO., LTD.
    Inventors: Katsuhito OMOTE, Yoshihiro IWASAKI