Discussion
What does a near field scanner measure?
Answer: A
The probe records both amplitude and phase at a grid of points on a plane, cylinder or sphere near the antenna, and a transform yields the far field pattern. Phase is essential, which is why the scanner's mechanical accuracy must be a small fraction of a wavelength. Total power, surface profile and terminal impedance are all measured by other means, though holographic processing of the same near field data can in fact reveal surface errors, which is a valuable by-product of the technique.
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