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Frequency-selective antenna with different signal polarizations

  • US 5,608,413 A
  • Filed: 06/07/1995
  • Issued: 03/04/1997
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A dual-frequency antenna for operation with first and second rf signals which respectively have λ

  • 1 and λ

    2 wavelengths, comprising;

    a slot radiator configured to radiate said first rf signal with linear polarization;

    a patch radiator configured to radiate said second rf signal with elliptical radiation; and

    a transmission line configured to carry said first and second rf signals and arranged to couple said first rf signal to said slot radiator and to couple said second rf signal to said patch radiator;

    wherein;

    said slot radiator includes a ground plane configured to define a slot radiative element;

    said transmission line is spaced from a first side of said ground plane; and

    said slot radiative element is positioned to couple said first rf signal between said transmission line and free space.

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