Computer prediction of large reflector antenna radiation properties
Abstract
A FORTRAN program for calculating reflector antenna radiation patterns was rewritten and extended to include reflectors composed of a number of panels. These individual panels must be analytic surfaces. The theoretical foundation for the program is as follows: Geometrical optics techniques are used to trace rays from a feed antenna to the reflector surface and back to a mathematical plane just in front of the reflector. The resulting tangential electric field distribution, assumed to be the only source of forward radiation, is integrated numerically to calculate the radiation pattern for a desired set of angles. When the reflector is composed of more than one panel, each panel is treated as a separated antenna, the raytracing procedure and integration being repeated for each panel. The results of the individual aperture plane integrations are stored and summed to yield the relative electric field strength over the angles of interest. An example and several test cases are included to demonstrate the use of the program and verify the new method of computation.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 July 1980
 Bibcode:
 1980STIN...8027556B
 Keywords:

 Antenna Radiation Patterns;
 Computer Programs;
 Geometrical Optics;
 Prediction Analysis Techniques;
 Reflectors;
 Antenna Arrays;
 Cartesian Coordinates;
 Electric Field Strength;
 Fortran;
 Numerical Integration;
 Ray Tracing;
 Communications and Radar