Abstract

ABSTRACT The paper deals with an extension of PO by fringe currents at the reflector rim and at slots in the reflector surface. Such slots occur, for instance, in unfurlable reflectors composed of solid panels or in hinged solid reflectors with no electrical contacts between the panels. The fringe-current effects on the antenna far field are evaluated numerically for representative cases. It is found that they are small and primarily influence the crosspolarized radiation. They may in the case of circularly polarized offset reflector antenna systems be the dominant crosspolar contribution due to the reflector alone.

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