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Radio telescopes are susceptible to interference arriving through itssidelobes. If a reflector antenna could be retrofitted with an adaptive nullsteering system, it could potentially mitigate this interference. The design ofa reflectarray which can be used to reconfigure a radio telescopes radiationpattern by driving a null to the angle of incoming interference is presented.The reflectarray occupies only a portion of the rim of the original reflectorand lays conformal to the paraboloid within this region. The conformalreflectarray contains unit cells with 1-bit reconfigurability stemming from twosymmetrically placed PIN diodes. It is found that the dielectric and switchlosses introduced by the reflectarray do not significantly affect the radiotelescopes efficiency since the reflectarray is placed only along the outer rimof the reflector which is weakly illuminated. Simulation results of an L-bandreconfigurable reflectarray for an 18m prime focus fed parabola are presented.

Design of Rim-Located Reconfigurable Reflectarrays for Interference Mitigation in Reflector Antennas