DocumentCode :
922063
Title :
Some aspects of beam waveguide design
Author :
Chan, K.K. ; Raab, A.R.
Author_Institution :
Spar Aerospace Limited, Electronic Group, Antenna Engineering, Ste. Anne de Bellevue, Canada
Volume :
129
Issue :
4
fYear :
1982
fDate :
8/1/1982 12:00:00 AM
Firstpage :
203
Lastpage :
210
Abstract :
Results of a numerical analysis study of beam waveguide (BWG) characteristics are presented in the paper. Vector-diffraction integrals have been used to analyse a particular configuration of the BWG which uses parabolas as the curved mirrors in a four-mirror system. In those configurations where the curved mirrors are rotated with respect to one another, it is found that a crosspolarised field is introduced into the plane of offset. This component is directly proportional to the angle of rotation. Except for this consideration, the four-mirror configuration can be reduced to a two-mirror configuration with a small error in performance prediction. Computed results characterising the BWG performance in terms of spillover losses, crosspolarisation generation and beamwidths of the emergent beam are presented. The effect of protective paint on the mirror surfaces is also analysed and it is found to depolarise the guided beam.
Keywords :
mirrors; polarisation; satellite ground stations; satellite relay systems; waveguide theory; waveguides; beam waveguide design; beamwidths; crosspolarisation; crosspolarised field; curved mirrors; emergent beam; four-mirror configuration; protective paint;
fLanguage :
English
Journal_Title :
Microwaves, Optics and Antennas, IEE Proceedings H
Publisher :
iet
ISSN :
0143-7097
Type :
jour
DOI :
10.1049/ip-h-1.1982.0042
Filename :
4645406
Link To Document :
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