* The span of antenna spacings (or squint-angles) should be adjusted and traded off to get the balance between accuracy and ambiguity of direction finding by phase-comparison (or amplitude-comparison)
–Antenna spacings of phased-array beamforming antenna structure have the order of fraction wavelengths, otherwise they will generate side-effect like ambiguity due to grating lobes. Note that spacing is defined as the space separation of antenna elements
–Antenna squint-angles of amplitude-array beamforming antenna structure similarly have the order of fraction beamwidths, otherwise it will generate side-effect like ambiguity due to side lobes. Note that squint-angle is defined as half of the angle separation of antenna elements.
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