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Multiband planar antenna

  • US 7,352,326 B2
  • Filed: 09/21/2004
  • Issued: 04/01/2008
  • Est. Priority Date: 10/31/2003
  • Status: Expired due to Fees
First Claim
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1. A multiband planar antenna having at least a lowest operating band and a second operating band and comprising a ground plane (310, 410) and a radiating plane (320;

  • 420;

    520), which is at a feeding point (FP) connected to an antenna port of the radio device and at a short-circuit point (SP) to the ground plane, which radiating plane comprises a first conductor branch and a second part such thatthe first conductor branch (321;

    421;

    521) together with the surrounding antenna parts forms a quarter-wave resonator shorted at the short-circuit point, a natural frequency of which resonator is located on the lowest operating band, andthe second part (322, 422, 525) together with the surrounding antenna parts forms a resonator, a natural frequency of which is located on the second operating band,characterized in that the radiating plane further comprises a conductor loop (323, 423, 523) starting from the feeding point (FP), joining the rest of the radiating plane close to the short-circuit point and ending at the short-circuit point (SP) for forming a loop radiator and for improving antenna matching on the lowest operating band, and a part of the first conductor branch of the radiating plane is located between the conductor loop and said second part.

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