A first-order treatment of aberrations in Cassegrainian and Gregorian antennas
Abstract
The decrease in aperture efficiency caused by small aberrations in a reflector antenna is determined. The important case of a Cassegrainian (or Gregorian) antenna with a feed placed in the vicinity of the focal point is treated in detail. For this case the various aberration components due to astigmatism, coma, etc., are derived explicitly, their effect on aperture efficiency is shown, and the conditions that optimize performance are given. The results are useful for the design of multibeam antennas in ground stations and satellites.
- Publication:
-
IEEE Transactions on Antennas and Propagation
- Pub Date:
- May 1982
- DOI:
- Bibcode:
- 1982ITAP...30..331D
- Keywords:
-
- Aberration;
- Antenna Design;
- Astigmatism;
- Cassegrain Antennas;
- Gregorian Antennas;
- Microwave Antennas;
- Antenna Radiation Patterns;
- Communication Satellites;
- Ground State;
- Optimization;
- Reflectors;
- Transmission Efficiency;
- Communications and Radar