Synthesis of electronically steerable antenna arrays with elements on concentric rings with reduced sidelobes

In conventional scanned antenna arrays, the elements are mostly distributed on uniformly spaced grids. The distribution of the array elements on concentric rings has however several advantages to these conventional arrays, notably a lower maximum sidelobe level as the conventional grating lobe mechanism no longer holds. In this paper the authors propose a method to reduce the maximum sidelobe level of an array with a given number of elements. The amplitude of the excitation of the array elements has the same value for all directions. The authors also propose a method for fast array factor computation for concentric ring grid arrays.