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Progress In Electromagnetics Research
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FAR-FIELD RECONSTRUCTION FROM NEAR-FIELD DATA ACQUIRED VIA A FAST SPHERICAL SPIRAL SCAN: EXPERIMENTAL EVIDENCES

By F. D'Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, and M. Migliozzi

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Abstract:
A probe-compensated near-field - far-field (NF-FF) transformation 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 verified in this paper. Such a technique, based on the nonredundant representation of electromagnetic fields, has been achieved by properly applying the unified theory of spiral scans for nonspherical antennas and adopting a very flexible source modelling, formed by two circular "bowls" with the same aperture diameter but different bending radii. A two-dimensional optimal sampling interpolation 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.

Citation:
F. D'Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, and M. Migliozzi, "Far-Field Reconstruction from Near-Field Data Acquired via a Fast Spherical Spiral Scan: Experimental Evidences," Progress In Electromagnetics Research, Vol. 140, 719-732, 2013.
doi:10.2528/PIER13050202
http://www.jpier.org/PIER/pier.php?paper=13050202

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