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PLANAR ANTENNA AND WIRELESS COMMUNICATION APPARATUS

  • US 20100045540A1
  • Filed: 06/10/2009
  • Published: 02/25/2010
  • Est. Priority Date: 08/20/2008
  • Status: Active Grant
First Claim
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1. A planar antenna, disposed on a plate having a first surface and a second surface, the planar antenna comprising:

  • a metal layer, disposed on the first surface, and having a slot line for exposing the first surface;

    an antenna body, disposed on the second surface, and having a ground end and a feed end, wherein the antenna body is corresponding to a surrounding of the metal layer except a partial area of the feed end thereof;

    a coupling device, disposed on the second surface, and a partial area of the coupling device corresponding to the slot line of the metal layer;

    a matching device, disposed on the second surface in an approach of corresponding to the metal layer, and electrically connected to the coupling device and the feed end, wherein the matching device is used for impedance matching between the antenna body and the coupling device; and

    a stepped impedance device, disposed on the second surface in the approach of corresponding to the metal layer, and electrically connected to the ground end of the antenna body, wherein the stepped impedance device has a transmission zero when being operated in a radio frequency band.

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