Discussion
What determines the number of simultaneous beams a digital array can form?
Answer: C
Once the element signals are digitised, each additional beam is another weighted sum in the processor, so the limit is computation rather than hardware. The element count sets the aperture and the degrees of freedom rather than the beam count, bandwidth affects the sampling rate, and a digital array may have no phase shifters at all. This is the fundamental advantage of digital over analogue beamforming and the reason it has spread as processing has become cheaper.
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