Ultra wideband loop antenna

  • US 7,639,201 B2
  • Filed: 01/17/2008
  • Issued: 12/29/2009
  • Est. Priority Date: 01/17/2008
  • Status: Expired due to Fees
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First Claim
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1. An ultra wideband loop antenna, comprising:

  • a planar antenna element defining either a generally semi-elliptical or generally elliptical perimeter having a major axis, a minor axis and a center, wherein the antenna element major axis is longer than its minor axis;

    an elongated, contiguous discontinuity in the antenna element that is symmetric about and elongated in a direction parallel to the antenna element minor axis, and entirely located within the antenna element, in which the discontinuity defines either a generally semi-elliptical or generally elliptical perimeter having a major axis, a minor axis and a center, wherein the discontinuity major axis is longer than its minor axis;

    in which the centers of the two ellipses are not coincident, and in which the major axis of the discontinuity is essentially colinear with or parallel to the minor axis of the antenna element, so as to define a feed end of the discontinuity located on the major axis of the discontinuity and spaced from one side of the antenna element perimeter by an element feed width, and so as to further define an opposed ground end of the discontinuity located on the discontinuity major axis and spaced from the opposing side of the antenna element perimeter by an element ground width, to define an antenna element ground portion, wherein the feed width is at least about five times greater than the ground width; and

    a feed region connecting the feed end of the discontinuity to the perimeter, to define one or two antenna element feed ends that are adjacent to the feed region.

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