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Multiple ridge antenna

  • US 4,590,478 A
  • Filed: 06/15/1983
  • Issued: 05/20/1986
  • Est. Priority Date: 06/15/1983
  • Status: Expired due to Fees
First Claim
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1. A variable-polarization microwave antenna for sending and receiving microwaves at frequencies within a predetermined frequency range, the antenna comprising:

  • A. first and second generally planar ground-plane conductors spaced apart and extending substantially parallel to each other, said first ground-plane conductor having an aperture therethrough and including first and second pairs of elongated ridges extending into said aperture and oriented perpendicular to each other, the ridges of each pair extending toward each other from opposite sides of said aperture and leaving a gap therebetween;

    B. shorting elements extending between said ground-plane conductors and surrounding said aperture to form a cavity defined by said shorting elements and said ground-plane conductors, the distances across said cavity in the directions of said ridges being between one-half and one wavelength at frequencies within the predetermined frequency range;

    C. a first feed line including a first elongated feed conductor extending between and generally parallel to said ground-plane conductors and into said cavity substantially in registration with the ridges of said first pair and across the gap therebetween; and

    D. a second feed line including a second elongated feed conductor extending between and generally parallel to said ground-plane conductors and into said cavity substantially in registration with the ridges of said second pair and across the gap therebetween, said first and second feed conductors being electrically isolated from each other.

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