Spherical near-field antenna measurements: A review of correction techniques

Following an introductory review of spherical near-field scanning measurements, with emphasis on the general applicability of the technique, we present a survey of the various methods to improve measurement accuracy by correcting the acquired data before performing the transform and by special processing of the resulting data following the transform. A post-processing technique recently receiving additional attention is the IsoFilter (TM) technique that assists in suppressing extraneous stray signals due to scattering from antenna range apparatus.