Discussion
What does a flat phase distribution across an aperture produce?
Answer: D
With equal phase everywhere, all contributions add along the normal to the aperture, putting the beam on boresight. Adding a linear phase gradient steers it away. Side lobes are governed by the amplitude distribution rather than the phase, and a flat phase distribution gives a stable rather than a frequency sensitive pattern. Phase points the beam and amplitude shapes it: that division covers most of what an aperture distribution does.
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