×

Dual frequency band inverted-F antenna

  • US 6,930,640 B2
  • Filed: 11/28/2003
  • Issued: 08/16/2005
  • Est. Priority Date: 03/28/2003
  • Status: Active Grant
First Claim
Patent Images

1. A dual frequency band inverted-F antenna for communicating a low frequency signal and a high frequency signal, comprising:

  • a substrate;

    a ground metal, which is formed on a lower surface of said substrate;

    a vortical metal structure, which is formed on an upper surface of said substrate, further having a short circuit end and an open circuit end wherein said open circuit end is located within a center of said vortical metal structure;

    a short circuit leg, which connects electrically said short circuit end of said vortical metal structure with said ground metal;

    a feeding leg, which extends along a predetermined direction of said vortical metal structure to couple with a feeding circuit on said substrate; and

    a terminal micro strip, which is fabricated on the lower surface of said substrate and connected electrically to said open circuit end through a first conductive aperture;

    wherein, by increasing an encircling number of said vortical metal structure to generate a coupling effect so that an equivalent wavelength of said high frequency signal becomes longer and thereby a resonance frequency at a lower frequency band and a second frequency is added for communicating at a higher frequency band.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×