Computation of near and far field radiation patterns of distorted reflector antennas
Abstract
Two common methods used for calculating far field radiation patterns of reflector antennas are current integration and aperture plane integration. Calculations using these are generally limited to perfect parabolic reflectors with in-focus feeds. This paper describes the extension of an existing aperture plane integration code to allow calculations with out of focus feeds and reflectors of arbitrary shape. The reflector surface may be specified in analytic form or by discrete points using Taylor's series expansions to define the surface. The aperture integration calculates the field for angles close to boresight while the GTD is used for angles further out to take into account the edge diffraction contributions. This technique is particularly useful for studying the behavior of large antennas subject to distortion by thermal and gravitational stress.
- Publication:
-
Canadian Domestic and International Satellite Communications Conference
- Pub Date:
- 1984
- Bibcode:
- 1984cdsc.conf...11P
- Keywords:
-
- Antenna Radiation Patterns;
- Geometrical Theory Of Diffraction;
- Parabolic Reflectors;
- Reflector Antennas;
- Spacecraft Antennas;
- Surface Distortion;
- Far Fields;
- Geometrical Optics;
- Near Fields;
- Space Communications, Spacecraft Communications, Command and Tracking