Experimental validation of a phaseless, non‐redundant planar spiral scanning for antenna characterisation

An effective, probe-compensated, phaseless Near-Field-Far-Field (NF–FF) transformation technique with planar spiral scanning is presented. The phase retrieval problem solved by a quadratic inverse process, whose data are the voltage squared amplitudes of NF samples acquired on two surfaces. available information antenna under test and geometry used to provide efficient representations for both unknowns data, thus improving accuracy reliability technique. Furthermore, disconnected apertures dealt adopting different sets prolate spheroidal wave functions represent aperture fields. Experimental results reported assess effectiveness proposed approach. A drastic reduction (about 90%) required samples, as compared standard λ/4 measurements (λ being wavelength), observed. Aggregating surfaces, uses less even when case complex, λ/2 performed single surface. Our approach exhibits an comparable that achieved complex non-redundant sampling or classical, plane-rectangular NF–FF transformations.