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Conically scanning antenna system for tracking radars

  • US 4,305,075 A
  • Filed: 12/15/1978
  • Issued: 12/08/1981
  • Est. Priority Date: 12/22/1977
  • Status: Expired due to Term
First Claim
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1. An antenna system comprising:

  • a main reflector with a paraboloidal concave surface centered on a principal axis;

    feed means on said principal axis for emitting linearly polarized outgoing waves with an electric-field vector oriented in a predetermined first direction transverse to said principal axis and for receiving linearly polarized incoming waves with an electric-field vector oriented in a second direction orthogonal to said first direction;

    a first auxiliary reflector confronting said paraboloidal surface and said feed means with a hyperboloidally curved first convex surface centered on said principal axis, said first auxiliary reflector being substantially transparent to said incoming waves but reflecting said outgoing waves from said feed means onto said paraboloidal surface for transmission in the direction of said principal axis;

    a second auxiliarly reflector confronting said paraboloidal surface and said feed means with a hyperboloidally curved solid second convex surface centered on an axis inclined to said principal axis at an acute angle, said first auxiliary reflector lying between said main reflector and said second auxiliary reflector whereby incoming waves reflected from said paraboloidal surface toward said second auxiliary reflector and redirected by the latter toward said feed means pass twice through said first auxiliary reflector; and

    drive means coupled with said second auxiliary reflector for rotating same about said principal axis, thereby subjecting said incoming waves to a conical scan.

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