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BACKLOBE REDUCTION IN REFLECTOR-TYPE ANTENNAS

  • US 3,599,219 A
  • Filed: 01/29/1969
  • Issued: 08/10/1971
  • Est. Priority Date: 01/29/1969
  • Status: Expired due to Term
First Claim
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1. In microwave transmission apparatus including at least one feed radiator and a conducting reflector of predetermined reflecting surface shape having at least a portion of its boundary exposed to feed radiations of substantially equal phase, the improved construction characterized by having a conducting extension on at least a portion of the boundary of the reflector so exposed, the extension departing from the reflecting surface shape and having means thereon for producing, at remote rearward locations, diffracted radiation fields of progressively advanced and progressively retarded phase from successive points along the edge of the extension, each progression of relative phase including a plurality of phases intermediate between the most advanced and the most retarded, the difference between the latter phases being greater than 180*, the rearwardly diffracted energy being widely diffused in directionality by the interaction of the numerouS phases.

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