Rotationally Symmetric Shaping of Center-Fed Reflector Antenna For GEO Communication Collocated Small-sized Spacecraft

摘要

An Innovative Rotationally-symmetric shaping of prime-focus reflector antenna for enhanced Edge-of-Beam (EoB) Gain and field suppression at feed aperture is described in this paper. This shaping eliminates the requirement of external vertex-plate. It embedded functionality of vertex plate within reflector surface. The Predicted and measured of Center-fed reflector has shown good agreement. Improvement of 0.3 dB in EoB Gain & 3 dB in Cross-polar Isolation (XPI), have been achieved; using this technique without increasing size of reflector antenna and changing feed system. Physical Optics (PO) and `Minimax Optimization' based tool is used for circular symmetric shaping. `Selective Zernike modes' help to achieve this goal.