Scattering by the feed support spars in a radio telescope

Details Scattering by the feed support spars in a radio telescope Scattering by the feed support spars in a radio telescope

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jeeea...4..138g&link_type=abstract

Journal of Electrical and Electronics Engineering, Australia (ISSN 0725-2986), vol. 4, June 1984, p. 138-148.

Astronomy and Astrophysics

Astronomy

Antenna Feeds, Electromagnetic Scattering, Parabolic Antennas, Radio Telescopes, Support Interference, Antenna Design, Astronomical Observatories, Design Analysis, Subreflectors

Scientific paper

This paper outlines a method which has been developed to compute the fields scattered by the latticed spars which support the primary feed or sub-reflector in a large parabolic antenna. It is applied in an examination of the 64 m radiotelescope at the CSIRO's Australian National Radio Astronomy Observatory, Parkes (ANRAO). The conclusion reached is that spar scatter becomes important in the overall antenna pattern at about the -40 dB level and that it may well be this effect which ultimately sets boresight axis polarization purity, independently of the nature of the feed.

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