CST – Computer Simulation Technology

Parabolic Focus Pattern Fed Reflector with Shroud

Image of the Parabolic focus pattern fed reflector with shroud Image of the Parabolic focus pattern fed reflector with shroud

Axisymmetric prime focus paraboloidal reflectors provide a good compromise between performance and cost, but can suffer from high-sidelobe levels if designed for high efficiency. Here a simple, practical, low-cost method is presented for suppressing close-in sidelobes to comply with stringent radiation pattern envelope specifications.

The antenna consists of an axisymmetric parabolic reflector and a metallic cylindrical shroud which extends from the rim of the reflector dish. In the antenna presented here, the physical feed antenna is substituted by a theoretical / simulated / measured pattern, simplifying the overall model and simulation accuracy is relaxed in favor of improved runtimes.

A typical feed is a horn antenna designed to give the desired illumination level of the paraboloid edges, e.g. -10 dB, with approximately equal E- and H-plane beamwidths

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