From nonuniform to uniform planar wide-mesh scanning data through an iterative technique

An effective iterative procedure for the correction of known errors in the probe positioning in a near-field to far-field transformation (NFFFT), that adopts a nonconventional plane-rectangular (PR) scan named planar wide-mesh scanning (PWMS), is proposed and experimentally validated in this work. The related NFFFT employs a two-dimensional optimal sampling expansion to reconstruct the NF data required by the classical PR NFFFT from the PWMS ones. Such an expansion has been attained by applying the nonredundant sampling representation of the electromagnetic fields to the voltage detected by the probe and adopting a double bowl as surface modelling the antenna. In the considered case of PWMS samples affected by known positioning errors, the correctly positioned (uniform) PWMS samples are unknown and are recovered from the position errors affected (nonuniform) ones via an efficient iterative technique.