Abstract
A probe-compensated near-fleld-far-fleld (NF-FF) trans- formation with spherical spiral scanning, which makes possible to lower the number of needed measurements, as well as the time required for the data acquisition when characterizing quasi-planar antennas, is experimentally verifled in this paper. Such a technique, based on the nonredundant representation of electromagnetic flelds, has been achieved by properly applying the unifled theory of spiral scans for nonspherical antennas and adopting a very ∞exible source modelling, formed by two circular \bowls with the same aperture diameter but difierent bending radii. A two-dimensional optimal sampling interpo- lation formula allows one to reconstruct the NF data at any point on the measurement sphere and, in particular, at those required by the classical NF-FF transformation with spherical scanning. The reported NF and FF reconstructions, obtained from the nonredundant samples acquired on the spiral, assess the accuracy of the proposed technique.
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