Discussion
What happens to the gain of a thinned array?
Answer: C
Gain follows the power actually radiated into the beam, so removing half the elements costs three decibels even though the beamwidth is unchanged. This is the clearest demonstration that beamwidth and gain are not the same thing: a thinned array has the resolution of a large aperture and the sensitivity of a small one. Side lobes rise rather than fall, and the relationship is linear rather than quadratic.
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