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Closed slot antenna having outer and inner magnetic loops

  • US 5,691,731 A
  • Filed: 06/07/1995
  • Issued: 11/25/1997
  • Est. Priority Date: 06/15/1993
  • Status: Expired due to Fees
First Claim
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1. A closed slot antenna, said antenna comprising a wire which is configured to form an antenna having an outer magnetic loop and an inner magnetic loop, said outer loop and said inner loop being generally concentric about a center point, said wire proceeding in a first angular direction with respect to said center point from a first point on the outer loop to a second point on the outer loop thereby traversing a first portion of the outer loop, said wire then reversing direction inwardly to a third point on the inner loop and proceeding in a second angular direction nearly completely about the inner magnetic loop until reaching a fourth point on the inner loop, said fourth point in non-contacting, close proximity to said third point, and reversing direction outwardly to a fifth point on the outer loop, and proceeding in said first angular direction about a second portion of the outer loop to a fifth point on the outer loop, said sixth point in non-contacting, close proximity to said second point thereby forming a virtual inner closed magnetic loop between said third point and said fourth point and a virtual outer closed magnetic loop between said first point and said sixth point.

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