Common mode filtering method and device

  • Patent Number
    US 7,932,793 B2
  • Inventor
    T.-L. Wu, and S.-J. Wu
  • Time
    Apr 01,2011
  • Abstract

    Provided are common mode filtering method and device for use with a defected ground structure, the device including a substrate, coupled microstrip lines formed on the substrate and a ground plane formed underneath the substrate, the common mode filtering method being characterized by forming at least a defected ground structure on the ground plane and making dual mode signals pass through the coupled microstrip lines, thereby using the defected ground structure to suppress dual model noises within a specific frequency band and prevent signal distortion.