Discussion
Why do very low side lobe arrays demand tight manufacturing tolerances?
Answer: B
However carefully the intended distribution is tapered, random errors add an incoherent floor, and once the design side lobe level approaches that floor further tapering achieves nothing. Reaching minus forty decibels therefore requires phase and amplitude accuracy across every path that ordinary construction will not give. Spacing and element matching matter for other reasons. The lesson is that a specification must be achievable in manufacture as well as on paper.
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