Displacement Errors in the Antenna Near-Field Measurements and Their Effect on the Far Field
NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD
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The effects of probe displacement errors in the near-field measurement procedure on the far-field spectrum are studied. Expressions are derived for the displacement error functions that maximize the fractional error in spectrum both for the on-axis and off-axis directions. Planar x-y and z- displacement errors the studied first and, consequently, the results are generalized to errors in spherical scanning. Some simple near-field models are used to obtain order of magnitude estimates for the fractional error as a function of relevant scale lengths of near field, defined as the lengths over which significant variations occur.
- Test Facilities, Equipment and Methods
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