An iterative approach to compensate the probe positioning errors in a nonredundant spherical NF-FF transformation

An efficient technique for compensating known probe positioning errors in a nonredundant spherical near-field - far-field (NF-FF) transformation, using an oblate ellipsoid to model a quasi-planar antenna, is experimentally assessed in this work. It employs an iterative approach to recover the nonredundant NF samples at the points fixed by the sampling representation from the collected irregularly spaced ones. The NF data required by the classical spherical NF-FF transformation are then efficiently determined from the nonredundant NF samples by means of an optimal sampling interpolation algorithm. Some experimental results, carried out at the UNISA Antenna Characterization Lab and assessing the effectiveness of the technique, are shown.