CST – Computer Simulation Technology

Parabolic Horn Fed Reflector with Shroud

Image of the Parabolic horn fed reflector with shroud Image of the Parabolic horn fed reflector with shroud

Axisymmetric prime focus paraboloidal reflectors provide a good compromise between performance and cost, but can suffer from high-side lobe levels if designed for high efficiency. Here's a simple, practical, low-cost method is presented for suppressing close-in side lobes 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. The feed used here is a pyramidal horn antenna designed to give the desired illumination level of the paraboloid edges, e.g. -10 dB. The E- and H-plane beamwidths are approximately equal and the -10 dB beamwidth can be specified.

A variety of other feed antennas may also be used, including simple conical horns, corrugated conical horns, compound box horns and axial-choke horns, to name a few. The Shrouded pattern fed parabolic reflector antenna (already in Antenna Magus) can be designed to substitute the horn feed with a theoretical, simulated or measured pattern. ...

3D gain comparison for a parabolic reflector with and without a shroud 3D gain comparison for a parabolic reflector with and without a shroud

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