Concentric Ring Array Synthesis for Low Side Lobes: An Overview and a Tool for Optimizing Ring Radii and Angle of Rotation

A comprehensive review on the approaches for synthesizing low side lobe concentric ring array (CRA) antennas is given. An Iterative Convex Optimization (ICO) based layout synthesis technique proposed peak side-lobe level (PSLL) minimization over a given circular field-of-view in steerable uniform-amplitude (UA-CRA) antennas. For number of rings and uniformly-distributed elements each ring, ICO algorithm optimizes radii angle rotation, with possible constraints minimum element separation largest size. As compared to existing UA-CRA techniques, method presents unique features as it combines capability optimization rotation PSLL multiple elevation scan angles computationally-efficient easy-to-solve procedure. Through numerical design examples, demonstrated how can be effectively used (i) synthesize sparse topologies generating beams, (ii) assess improve suppression performance various known algorithms. Based synthesized via competitive methods recent literature, new set improved are presented.