A SHAPED REFLECTOR AS A PRIMARY FEED FOR HAYSTACK

Abstract

The paper describes a technique for obtaining high aperture efficiency in the Haystack 120-foot diameter Cassegrain antenna system. The approach used seeks to maximize the percentage of power intercepted by the hyperboloidal subreflector of the Cassegrain antenna system by shaping its primary feed radiation pattern. The primary feed configuration is a linearly polarized waveguide feed illuminating a specially shaped reflector. A number of theoretical antenna models were calculated and one of these antennas (a 30 wavelength diameter shaped reflector at 7750 Mcps) was fabricated and evaluated. Calculated estimates of percentage of primary feed power intercepted by the subreflector and Cassegrain aperture efficiency are presented.

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Document Details

Document Type
Technical Report
Publication Date
Sep 30, 1965
Accession Number
AD0625375

Entities

People

  • A. Sotiropoulos

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Antenna Apertures
  • Antenna Feeds
  • Antenna Radiation Patterns
  • Antennas
  • Cassegrain Antennas
  • Diameters
  • Displacement
  • Efficiency
  • Geometry
  • Massachusetts
  • Microwave Antennas
  • Near Field
  • Radiation
  • Radiation Patterns
  • Shape
  • Spherical Waves

Fields of Study

  • Physics

Readers

  • Astronomy and Astrophysics.
  • Phased Array Antenna Design.