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Abstract
Spherical conformal phased arrays of spiral antennas are proposed for obtaining full scan coverage and polarisation agility over a broad band. The spiral elements are randomly distributed on a spherical surface with uniform spatial density. The array scan performance is analysed at the varying of the number of elements and over an octave bandwidth from 1.5 to 3 GHz. Since mutual coupling between the antenna elements could be significant in determining the ultimate performance, the array radiation characteristics are evaluated by resorting to the active element pattern approach and the method of moments (MoM)..