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New results and conceptual design principles concerning multiple beam reflector antennas in which coupling effects are of major influence on antenna performance are presented. Special attention is paid to a certain class of feeds consisting of minimum scattering antennas (MSA's). The mutual impedance between two identical MSA's is expressed as an integral over their power patterns including complex...
Numerical optimisation techniques have been used to find the maximum gain of some specific parasitic arrays. The gain of an array of infinitely thin, equispaced dipoles loaded with arbitrary reactances has been optimised. The results show that standard travelling-wave design methods are not optimum. Yagi--Uda arrays with equal and unequal spacing have also been optimised with experimental verification.
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