Nonredundant NF-FF transformation with bi-polar scanning: experimental testing

A probe compensated near-field – far-field (NF–FF) transformation technique with bi-polar scanning for quasi-planar antennas, requiring a minimum number of NF data, is experimentally validated in this work. Such a technique relies on the nonredundant sampling representations of electromagnetic fields and adopts an oblate ellipsoid to shape a quasi-planar antenna. A 2-D optimal sampling interpolation expansion is then employed to accurately reconstruct the NF data needed by the classical plane-rectangular NF–FF transformation from the acquired bi-polar ones. It is so possible to obtain a remarkable reduction in the number of NF measurements and related acquisition time. Some experimental results, performed at the Antenna Characterization Lab of the University of Salerno and confirming the effectiveness of the proposed NF–FF transformation technique, are shown.