NASA NTRS · 19740000041
Variable-beamwidth antennas
Abstract
Two effective designs have been developed for Cassegrain and Gregorian antenna configurations. Each provides for both high-gain and low-gain operations. Cassegrain system sacrifices some efficiency due to small amount of increased spillover loss. Gregorian system provides for independent spillover control with two feeds.
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Schmidt, R. F.. 1974-07-01. Variable-beamwidth antennas. https://ntrs.nasa.gov/citations/19740000041
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