Discussion
What are quantisation lobes?
Answer: B
Real phase shifters have a finite number of bits, so the applied phase is a staircase approximation to the ideal ramp and the periodic error radiates into spurious lobes. Randomising the assignment of shifter settings across the aperture breaks up the periodicity and spreads the energy into the side lobe floor instead. Signal sampling, ordinary side lobes and scan loss are separate matters. It is a good example of a digital implementation detail with a directly visible effect on the pattern.
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