Nonredundant NF-FF Transformation with Planar Spiral Scan Optimized for Flat Antennas Under Test

Bevilacqua, F.; D’Agostino, Francesco; Ferrara, Flaminio; Gennarelli, Claudio; Guerriero, Rocco; Migliozzi, Massimo

doi:10.23919/amta52830.2021.9620571

Cited by 2 publications

(2 citation statements)

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“…Then, an Optimal Sampling Interpolation (OSI) formula of central type is applied to accurately reconstruct the voltage on the scanning plane from its non-redundant spiral samples. Whereas, the application of the unified theory of spiral scannings for non-volumetric antennas [34,35] has allowed the development of non-redundant NF-FF transformations with planar spiral scanning using an even smaller amount of samples in the case of quasi-planar [36,37], or flat [38] AUTs. Fortunately, the advanced sampling techniques in ref.…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately, the advanced sampling techniques in ref. [32][33][34][35][36][37][38] can be applied to squared amplitude fields (voltages) too, if the doubling of the squared amplitude field spatial bandwidth is taken into account [39]. By properly applying the unified theory of spiral scannings for non-volumetric AUTs [34] and adopting an oblate spheroidal modelling of the antenna, a non-redundant sampling representation of the squared amplitude of the probe voltage from its spiral samples and the related OSI expansion have been here developed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Bevilacqua

Capozzoli²,

Curcio³

et al. 2023

IET Microwaves Antenna & Prop

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An effective, probe-compensated, phaseless Near-Field-Far-Field (NF-FF) transformation technique with planar spiral scanning is presented. The phase retrieval problem is solved by a quadratic inverse process, whose data are the voltage squared amplitudes of the NF samples acquired on two scanning surfaces. The available information on the antenna under test and on the scanning geometry are used to provide efficient representations for both the unknowns and the data, thus improving the accuracy and reliability of the technique. Furthermore, disconnected apertures are dealt with by adopting two different sets of prolate spheroidal wave functions to represent the aperture fields. Experimental results are reported to assess the effectiveness of the proposed approach. A drastic reduction (about 90%) of the required NF samples, as compared to standard λ/4 measurements (λ being the wavelength), is observed. Aggregating the measurements on the two scanning surfaces, the technique uses less samples even when compared to the case of complex, λ/2 measurements performed on a single surface. Our approach exhibits an accuracy comparable to that achieved when adopting complex measurements with non-redundant sampling or classical, λ/2 plane-rectangular NF-FF transformations. K E Y W O R D S antenna radiation patterns, antenna testing, optimisation, sampling methodsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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