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Antenna device and portable radio communication device

  • US 6,947,000 B2
  • Filed: 07/16/2001
  • Issued: 09/20/2005
  • Est. Priority Date: 07/14/2000
  • Status: Expired due to Fees
First Claim
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1. An antenna device having an antenna element and a ground conductor working as an antenna wherein the antenna element is fed via an antenna feeding portion, and a high-frequency current flows to the ground conductor via the antenna feeding portion, the antenna device comprising:

  • high-frequency current suppressing means formed of a conductive plate of a predetermined shape having one end along one direction connected to the ground conductor to form a short circuit and having an other end electrically opened from the ground conductor, wherein the high-frequency current suppressing means has slits extending perpendicular to the one direction, and wherein the slits make the effective length of the conductive plate ((2n+1)/4) times a wavelength of a radio communication frequency, n being a natural number including zero.

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