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Monopole antenna

  • US 7,391,374 B2
  • Filed: 10/12/2006
  • Issued: 06/24/2008
  • Est. Priority Date: 03/04/2004
  • Status: Expired due to Fees
First Claim
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1. A monopole antenna comprising:

  • a ground plane;

    a flat conductor faced to the ground plane and separated from the ground plane by a predetermined clearance, the flat conductor having an inner conductor and an outer conductor that is disposed around the inner conductor and separated from the inner conductor by another predetermined clearance;

    a linear conductor coupled to the flat conductor, the linear conductor extending on a ground plane side in an insulated state from the ground plane and being coupled to a feeding point; and

    at least one coupling conductor located at a region of the another predetermined clearance and inter-coupling an outer edge of the inner conductor and an inner edge of the outer conductor,wherein the coupling conductor is formed with a set angle with respect to a center of the flat conductor, and the coupling conductor resonates with a resonance frequency depending on the set angle.

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