DocumentCode
1024337
Title
A first-order treatment of aberrations in Cassegrainian and Gregorian antennas
Author
Dragone, Corrado
Author_Institution
Crawford Hill Lab., Bell Labs., Inc., Holmdel, NJ, USA
Volume
30
Issue
3
fYear
1982
fDate
5/1/1982 12:00:00 AM
Firstpage
331
Lastpage
339
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.
Keywords
Reflector antennas, multireflector; Antenna feeds; Aperture antennas; Ellipsoids; Geometrical optics; Measurement standards; Nonlinear optics; Reflector antennas; Satellite antennas; Satellite ground stations; Vision defects;
fLanguage
English
Journal_Title
Antennas and Propagation, IEEE Transactions on
Publisher
ieee
ISSN
0018-926X
Type
jour
DOI
10.1109/TAP.1982.1142793
Filename
1142793
Link To Document