Grating Lobe Mitigation in Ultra-wideband Phased Arrays

A numerically efficient optimization technique aimed at the suppression of grating lobes in ultra-wideband phased array antenna is proposed. Low computational complexity is achieved through efficient representation of the array factor over the desired band of frequencies and domain of main beam and observation directions. Subarray approach and fast array factor evaluation algorithm further reduce the computational cost. Significant grating lobe suppression in Cartesian and hexagonal array geometries has been demonstrated.