Discussion
Why must the probe pattern be corrected for in near field scanning?
Answer: A
The probe has a pattern of its own, so what it records is the field weighted by that pattern, and the transform must divide it out. Open ended waveguide probes are used because their patterns are smooth and well known. Gain is a scale factor removed by calibration, probe scattering is minimised by design and by separation, and loading is negligible at normal distances. Correcting for the instrument's own response is a standard step in any careful measurement.
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