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Design of Reconfigurable Rim Scattering Reflectarrays for Null Steering in Reflector Antennas. (arXiv:2305.18199v1 [eess.SY])

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Reflector antennas are susceptible to interference arriving through its
sidelobes. The design of a reconfigurable rim scattering reflectarray which can
be retrofitted to existing high gain reflector antennas giving the reflector
adaptive null steering capabilities is presented thereby giving the reflector
interference mitigation capabilities. The conformal reflectarray, placed along
the outer rim of the reflector antenna, contains reconfigurable unit cells
(RUC). The states of the RUCs allow the reflectarray to place a null in any
direction within the first few sidelobes of the reflector pattern. A 1-bit RUC
containing two pin diodes with less than 0.44dB loss at the operating frequency
is presented. It is found that the dielectric and switch losses do not
significantly affect the overall efficiency of the reflector as they are placed
only along the outer rim of the reflector which is weakly illuminated. Two
reflectarrays are designed. First, a L-band non-reconfigurable reflectarray
based on variable patch size for an 18m prime focus fed parabola is presented.
A full-wave simulation of this design serves to validate the design approach.
Subsequently, a reflectarray design using RUCs is presented. All necessary
formulations for complete reproducibility of results are provided in appendices
allowing for follow-on work.

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