Abstract
ABSTRACT RCS (Radar Cross Section) reduction by proper shaping is applied to the problem of reducing the RCS levels of a center fed parabolic reflector antenna system such that antenna gain, sidelobe level, and physical size of the reflector are preserved. A detailed numerical - physical investigation of the electromagnetic scattering phenomena associated with parabolic reflector antennas is presented. The electromagnetic scattering phenomenon are identified and categorized according to their contributions to the overall RCS level of the antenna system. The dominant scattering phenomena is used to formulate a low RCS design requirement for the design of low RCS reflector antennas. These antennas have radiation characteristics similar to center fed parabolic antennas, but have greatly reduced RCS levels. A new low RCS reflector antenna system is designed to replace an existing center fed parabolic reflector antenna system. The new antenna is designed by combining a high frequency, ray based, reflector design technique with the low RCS design requirements. The newly designed low RCS reflector antenna system is found to have transmitting characteristics similar to that of the original center fed reflector parabolic antenna but with RCS levels reduced by up to 25 dB.
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