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Dual frequency microstrip patch antenna with capacitively coupled feed pins

  • US 5,003,318 A
  • Filed: 10/24/1988
  • Issued: 03/26/1991
  • Est. Priority Date: 11/24/1986
  • Status: Expired due to Term
First Claim
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1. In a multiple frequency stacked microstrip patch antenna, said antenna including at least two spaced apart radiating patches which are shaped to resonate at one of the GPS frequencies, and a ground plane, one of said patches being stacked substantially vertically above the other and the ground plane, said patches being sized and spaced to resonate at different frequencies, a feed means comprising a pair of feed pins extending through holes in the lower patch at a point approximately 0.075 inches along their respective longitudinal axes from the inner most edge of said holes for capacitive coupling thereto and terminating in a physical electrical connection to the upper patch, the longitudinal axes of the holes being substantially radially aligned with the center of the lower patch, the improvement comprising means to match the input impedances to each of the patches at their respective bandwidths comprising a modified shape for said feed-through holes, each of the holes having an arcuate portion substantially defined by a circle having a radius of approximately 0.075 inches, said feed pins extending through said holes at substantially the center of the circles, and each of said holes having a second arcuate portion substantially defined by a circle having a radius of approximately 0.05 inches, said first and second circles at least partially overlapping.

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