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Scanable antenna arrangements capable of producing a large image of a small array with minimal aberrations

  • US 4,203,105 A
  • Filed: 05/17/1978
  • Issued: 05/13/1980
  • Est. Priority Date: 05/17/1978
  • Status: Expired due to Term
First Claim
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1. A multiple reflector antenna arrangement comprisinga main parabolic reflector (10) comprising a predetermined exit aperture (DO) and a geometric focal point (F);

  • a parabolic subreflector (12) comprising a geometric focal point (F or F1) and disposed confocally with a next previous reflector along a transmission path of the atenna arrangement in the direction toward the main parabolic reflector from said parabolic subreflector; and

    a feed array (14) comprising a plurality of feed elements and directed at the parabolic subreflectorcharacterized in thatthe feed elements of the feed array are disposed substantially on a plane (ξ

    1) which is a conjugate plane relative to the exit aperture of the main reflector such that a ray incident at a central point (Co) of the main reflector from any direction, when reflected by said main reflector essentially intersects the conjugate plane at said feed array at a central point (C1).

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