Efficient Computation of Reflector Antenna Aperture Distributions and Far Field Patterns

Abstract

A computationally efficient method is presented for calculating the aperture distribution and the far field pattern of a parabolic reflector with an off-axis array feed. Idealized, uncoupled array elements and realistic, mutually coupled, circular waveguide elements are considered. Ray optics are used to determine the scalar aperture field over a rectangular grid of aperture sampling points. Two alternatively methods for performing the aperture integration required for the pattern evaluation are compared: (a) based on summation of subapertures with constant amplitude/linear phase, and (b) based on the Fast Fourier Transform (FFT) and sampling theory. Patterns obtained with this method are compared with independency computed patterns that use other approaches. The range of validity of the aperture field integration method is discussed.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1984
Accession Number
ADA147367

Entities

People

  • Hans Steyskal
  • Robert A. Shore

Organizations

  • Rome Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Amplitude
  • Antenna Apertures
  • Antenna Configurations
  • Antennas
  • Computational Science
  • Computations
  • Computers
  • Coordinate Systems
  • Far Field
  • Geometry
  • Grids
  • Plastic Explosives
  • Polarization
  • Radiation
  • Reflectors
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Approximation Theory.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Optical Physics and Photonics.