Discussion
What does a near field scanner measure?
Answer: B
A probe records the complex field at a grid of points on a plane, cylinder or sphere, and a transform yields the far field pattern. Phase is essential, so the scanner's mechanical accuracy must be a small fraction of a wavelength and the instrumentation must be phase stable. Total power is obtained by other means, impedance is a terminal quantity, and surface profiling is a mechanical measurement, though the same near field data can reveal surface errors as a by-product.
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