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Astigmatism in reflector antennas: measurement and correction

A. Greve, B. LeFloch, D. Morris, H. Hein, S. Navarro
Abstract: We investigate astigmatism in Cassegrain antennas from cross scans through in--and--out--of--focus diffraction images of extended radio sources. The use of extended sources is of interest for large (mm--wavelength) telescopes where the bright planets subtend a substantial fraction of the beam. The experimental and theoretical results presented here refer to the IRAM 30--m telescope and measurements at 7.7 -- 1.3 mm wavelength; however, extrapolation to other telescopes is evident.
Trans. IEEE Ant. Propag., in print

Robert Lucas
Thu Mar 9 14:36:33 MET 1995