Experimental results validating the near-field to far-field transformation technique with helicoidal scan

This paper concerns the experimental validation of the near-field – far-field transformation technique with helicoidal scanning. Such a technique, based on the theoretical results concerning the nonredundant sampling representations of the electromagnetic fields, makes use of a two-dimensional optimal sampling interpolation formula to reconstruct the near-field data needed to perform the classical near-field – far-field transformation with cylindrical scan. The comparison of the far-field patterns reconstructed from the acquired helicoidal measurements with those obtained from the data directly measured on the classical cylindrical grid assesses the effectiveness of the near-field – far-field transformation using this innovative scanning technique. Its validity is further confirmed by the very good agreement with the direct farfield measurements.