Feed support blockage in symmetric paraboloid reflectors

Author

Sanad, M.S.A. ; Shafai, L.

Author_Institution

Dept. of Electrical Engng., Univ. of Manitoba, Winnipeg, Man., Canada

Volume

9

Issue

3

fYear

1984

fDate

7/1/1984 12:00:00 AM

Firstpage

83

Lastpage

91

Abstract

The effects of the primary feed supporting struts on the radiation patterns of a symmetric paraboloid reflector are investigated. Both linear and circular polarization of the feed are considered, and the reflector secondary fields are generated using the physical optics approximation for the surface current on the reflector. The strut fields, on the other hand, are computed by assuming the strut currents as those generated on an infinite cylinder illuminated by a plane incident wave. For struts of circular cross-section, the overall-radiation patterns of the reflector are computed and compared with those of an unblocked reflector. Based on this comparison, the effects of the strut dimensional parameters on the reflector gain, sidelobe levels and the cross-polarization are determined and presented graphically.

Keywords

antenna radiation patterns; antenna theory; reflector antennas; circular polarization; cross-polarization; dish antennas; feed support blockage; linear polarisation; physical optics approximation; primary feed supporting struts; radiation patterns; reflector gain; reflector secondary fields; sidelobe levels; strut currents; strut dimensional parameters; strut fields; struts of circular cross-section; support obstructed reflector antennas; surface current; symmetric paraboloid reflectors; unblocked reflector; Antenna radiation patterns; Apertures; Approximation methods; Feeds; Lighting; Scattering; Shadow mapping;

fLanguage

English

Journal_Title

Electrical Engineering Journal, Canadian

Publisher

ieee

ISSN

0700-9216

Type

jour

DOI

10.1109/CEEJ.1984.6593790

Filename

6593790