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Planar radiation antenna elements and omni directional antenna using such antenna elements

  • US 6,094,177 A
  • Filed: 11/24/1998
  • Issued: 07/25/2000
  • Est. Priority Date: 11/27/1997
  • Status: Expired due to Fees
First Claim
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1. A flat surface or planar antenna element for an antenna comprising:

  • a first frame-type antenna element with a pair of short side portions, a pair of long side portions, and a feed point mounted to the long side, said element having a short side ratio to the long side ratio of between about 1;

    4 and 1;

    8 and wherein the length of a long side portion is approximately equal to the wavelength of a first selected frequency and the short side portion is between about 1/3 to about 1/2 the length of the long side portion, said feed point being located at approximately the central point of the long side, such that each of said two short side portions and long side portions may be excited at the same time;

    a short bar mounted at a selected distance from both end points of said pair of long sides;

    the short sides mounted on the end points of said pair of long sides so as to form a frame-type antenna element having a perimeter forming an endless conductor; and

    said pair of long sides being formed symmetrically around a central portion of said long sides such that a first portion at one end of a long side is bent at an angle of between 45 degrees and 90 degrees with respect to said central portion and a second portion at the other end is bent so as to be parallel to said first portion, and said first and second portions extend from said central portion in opposite directions from each other.

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