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International Journal of Antennas and Propagation
Volume 2011 (2011), Article ID 936781, 11 pages
http://dx.doi.org/10.1155/2011/936781
Research Article

Effective Antenna Modellings for NF-FF Transformations with Spherical Scanning Using the Minimum Number of Data

Department of Electronic and Computer Engineering, University of Salerno, Via Ponte Don Melillo, I-84084 Fisciano (Salerno), Italy

Received 23 September 2010; Accepted 15 January 2011

Academic Editor: Z. Chen

Copyright © 2011 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.

Abstract

Two efficient probe-compensated near-field-far-field transformations with spherical scanning for antennas having two dimensions very different from the third one are here developed. They rely on the nonredundant sampling representations of the electromagnetic fields and on the optimal sampling interpolation expansions, and use effective antenna modellings. In particular, an antenna with a predominant dimension is no longer considered as enclosed in a sphere but in a cylinder ended in two half spheres, whereas a surface formed by two circular “bowls” with the same aperture diameter but different lateral bends is adopted to shape an antenna with two predominant dimensions. These modellings are able to fit very well a lot of antennas by properly setting their geometric parameters. It is so possible to remarkably lower the number of data to be acquired, thus significantly reducing the measurement time. Numerical tests assessing the accuracy and the robustness of the techniques are reported.