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Method and apparatus for matched impedance feeding of microstrip-type radio frequency antenna structure

  • US 4,613,868 A
  • Filed: 02/03/1983
  • Issued: 09/23/1986
  • Est. Priority Date: 02/03/1983
  • Status: Expired due to Fees
First Claim
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1. A radio frequency antenna structure comprising a symmetrically fed dual-slotted half-wavelength microstrip radiator patch and including:

  • a linearly polarized radiator patch having a resonant half-wavelength dimension along its direction of linear polarization and a low impedance centerline transverse to said resonant dimension, said patch being disposed above a reference surface and defining a resonant cavity with a pair of spaced-apart radiating slots or apertures therebetween;

    an r.f. feedpoint connection disposed substantially within said radiator patch; and

    an impedance matching slot having an entirely closed boundary perimeter of less than one wavelength formed within said radiator patch substantially along said low impedance centerline transverse to said resonant dimension and also having predetermined location and dimensions for producing a corresponding predetermined r.f. impedance at said r.f. feedpoint connection.

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