Discussion
What is the usual sample spacing in a near field scan?
Answer: B
Sampling theory applied to the aperture requires about half a wavelength spacing to represent the field without aliasing, which is why a large aperture takes a long time to scan. Finer spacing wastes time without adding information, and coarser spacing aliases wide angle energy into the computed pattern. The parallel with the Nyquist criterion in signal processing is exact, since the aperture to far field relationship is a Fourier transform.
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