Abstract
A design theory is presented for Cassegrain antennas employing dielectric-cone feeds. A modal approach is used to describe the aperture field over the subreflector, while a ray-optics method is employed to determine the sub-reflector profile and main-reflector aperture distribution. Experiments have been made with antennas designed for operation over bands centred near 11 and 18 GHz, and results are in generally good agreement with theory. These antennas are shown to have high efficiency, good main-beam symmetry and low mutual coupling.
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