Removal of Mast Reflections by Harp in the SG Installation Aboard Destroyers,

Abstract

A study has been made of the antenna patterns for the SG radar installation aboard a destroyer. The relfector and feed were of an improved design with side lobes approximately the same as those of the SG now under development (below 30 db). It is shown that side lobes as high as 21 db are introduced by mast reflections and that they may be eliminated by covering the illuminated section of the mast with Harp. The influence of such side lobes on the PPI presentation when large targets are nearby has also been studied and a marked improvement found with the mast reflections removed by Harp. It is concluded that the benefit derived from lower side lobes in an improved SG antenna can only be realized if provision is made to remove the mast reflections by Harp. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 22, 1946
Accession Number
AD0499872

Entities

People

  • M. H. Johnson
  • R. W. Wright

Organizations

  • United States Naval Research Laboratory

Tags

DTIC Thesaurus Topics

  • Bays
  • Chesapeake Bay
  • Destroyers
  • False Targets
  • Generators
  • Military Research
  • Navy
  • Photographs
  • Photography
  • Radio Waves
  • Reflection
  • Reflectors
  • Ships
  • Signal Generators
  • Targets
  • Transmitters

Readers

  • Phased Array Antenna Design.
  • Seismology
  • Tactical Satellite Communications Systems Engineering.