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International Journal of Antennas and Propagation
Volume 2010, Article ID 859396, 8 pages
Research Article

Near-Field/Far-Field Transformation with Helicoidal Scanning from Irregularly Spaced Data

Dipartimento di Ingegneria dell'Informazione ed Ingegneria Elettrica, University of Salerno, Via Ponte Don Melillo, 84084 Fisciano, Italy

Received 14 June 2010; Accepted 14 September 2010

Academic Editor: Krishnasamy Selvan

Copyright © 2010 Francesco D'Agostino et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A fast and accurate technique for the compensation of the probe positioning errors in the near-field/far-field transformation with helicoidal scanning is proposed in this paper. It relies on a nonredundant sampling representation using a spherical modelling of the antenna under test and employs an iterative scheme to evaluate the near-field data at the points fixed by the helicoidal nonredundant representation from the acquired irregularly distributed ones. Once these helicoidal data have been recovered, those required by a classical cylindrical near-field/far-field transformation are efficiently determined by using an optimal sampling interpolation algorithm. Some numerical tests assessing the effectiveness of the proposed approach and its stability with respect to random errors affecting the near-field data are shown.