Discussion
How does scanning a beam move the grating lobes?
Answer: D
Steering adds a constant to the pattern variable, so the entire periodic array factor slides and a repetition that was outside the visible region can move into it. That is why an array with spacing acceptable at broadside develops a grating lobe when scanned. The lobes are not created by scanning, they always exist mathematically, and they move together rather than converging on the main beam. This is the clearest way to see why wide scan demands close spacing.
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