Discussion
What is truncation error in planar near field scanning?
Answer: D
Energy leaving the antenna at wide angles misses a finite scan plane, so the computed far field is reliable only within a cone determined by the scan size and the separation. Enlarging the scan or moving closer widens the valid region. Sampling spacing, probe correction and positioner accuracy are separate error sources, each with its own treatment. Knowing over what angular region a measurement is valid is as important as the measurement itself.
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