Abstract
The maximum available range of a space-to-ground communication system is analyzed from the standpoint of the receiving ground antenna. The range, or signal-to-noise ratio of such a system is influenced by the aperture efficiency and noise temperature of the antenna. The aperture efficiency can be increased and the noise temperature decreased if the feed pattern f; (ψ) is unity up to the aperture angle of the paraboloid and is zero beyond this angle. The ideal feed pattern can be approximated by a Cassegrain type primary reflector if the aperture size of the secondary reflector is large. Theoretical and experimental results are provided to determine the optimum dimensions of such an antenna.
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