Patents Examined by Senng Ham
  • Method of adjusting a frequency response in a three-conductor type filter device
    Patent number: 5075653
    Abstract: A method of adjusting a frequency response in a filter device of a three-conductor type having a pair of stacked dielectric substrates with a plurality of strip-line resonator conductors being sandwiched therebetween, wherein the frequency adjusting of the filter is performed by partially removing the ground conducting layer provided on the peripheral portion of each dielectric substrate at regions corresponding to the open circuit ends, or to the open circuit ends and the short circuit ends of the resonator conducting layers.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: December 24, 1991
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Kenji Ito, Hiroyuki Shimizu