Discussion
What is the principal cost of an adaptive array?
Answer: C
Computing weights requires the signal from each element separately, so a full receiver chain and analogue to digital converter is needed per element, which is expensive in cost, power and processing. Subarray schemes reduce it at the cost of fewer degrees of freedom. The aperture is whatever the gain requires, bandwidth is set by the elements and the sampling, and the main beam is steered as freely as in any phased array.
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