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Rotating field antenna with a magnetically coupled quadrature loop

  • US 6,166,706 A
  • Filed: 11/04/1998
  • Issued: 12/26/2000
  • Est. Priority Date: 11/04/1998
  • Status: Expired due to Fees
First Claim
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1. A multiple loop antenna comprising:

  • (a) a loop having a figure eight shape, the loop having an upper loop and a lower loop connected in parallel with each other, the loop including a crossover region between the bottom of the upper loop and the top of the lower loop;

    (b) a drive element for driving the figure eight loop; and

    (c) a center loop overlapping only a portion of the crossover region and a portion of the figure eight loop, wherein the center loop has no direct or physical electrical connection to the figure eight loop or to the drive element, and wherein magnetic induction produces a 90 degree phase difference between the phase of the figure eight loop and the phase of the center loop, the antenna thereby producing a rotating composite field when driven by the drive element.

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