Astigmatism in reflector antennas: measurement and correction

Details Astigmatism in reflector antennas: measurement and correction Astigmatism in reflector antennas: measurement and correction

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994itap...42.1345g&link_type=abstract

IEEE Transactions on Antennas and Propagation, vol. 42, issue 9, pp. 1345-1350

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Scientific paper

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 7.3 mm-1.3 mm wavelength; however, extrapolation to other telescopes is evident. We report on an experiment to correct the astigmatism (phase) at a position close to the focal plane of the telescope, i.e., the flat surface of the corotating Nasmyth mirror.

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