Abstract

The primary astigmatism of a parabolic antenna of an aperture of 10³ λ and f/D = 0.43 was investigated. The measured astigmatic aberration is caused predominantly by large span surface deformations. In the case described, the focus of a Cassegrain system of 11.85 magnification is broadened up to 153 mm at the secondary and up to 2 mm at the primary focus. This aberration effect accounts for 5%–6% of the total intensity.

© 1969 Optical Society of America

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