This communication provides the experimental validation of an efficient probe compensated near-field – far-field (NF– FF) transformation technique with planar spiral scanning, which requires a nonredundant, i.e. minimum, number of NF measurements. Such a technique allows a significant measurement time saving due to both the reduced number of needed NF data and the use of continuous and synchronized movements of the positioning systems. It is based on a nonredundant sampling representation of the voltage measured by the probe, obtained by using the unified theory of spiral scannings for nonspherical antennas and adopting an oblate ellipsoid to model a quasi-planar antenna. By using such a modelling, instead of the spherical one, it is possible to significantly reduce the error related to the truncation of the scanning zone, since the NF data can be acquired on a spiral lying on a plane placed at a distance smaller than one half of the antenna maximum size. An optimal sampling interpolation expansion is applied to efficiently retrieve the NF data needed by the classical plane-rectangular NF–FF transformation from those collected along the spiral. Some experimental results, performed at the UNISA Antenna Characterization Lab and assessing the effectiveness of the technique, are reported.

Far-field reconstruction from near-field data collected through a planar spiral scan: experimental evidences

D'AGOSTINO, Francesco;FERRARA, Flaminio;GENNARELLI, Claudio;GUERRIERO, ROCCO;MIGLIOZZI, MASSIMO
2014-01-01

Abstract

This communication provides the experimental validation of an efficient probe compensated near-field – far-field (NF– FF) transformation technique with planar spiral scanning, which requires a nonredundant, i.e. minimum, number of NF measurements. Such a technique allows a significant measurement time saving due to both the reduced number of needed NF data and the use of continuous and synchronized movements of the positioning systems. It is based on a nonredundant sampling representation of the voltage measured by the probe, obtained by using the unified theory of spiral scannings for nonspherical antennas and adopting an oblate ellipsoid to model a quasi-planar antenna. By using such a modelling, instead of the spherical one, it is possible to significantly reduce the error related to the truncation of the scanning zone, since the NF data can be acquired on a spiral lying on a plane placed at a distance smaller than one half of the antenna maximum size. An optimal sampling interpolation expansion is applied to efficiently retrieve the NF data needed by the classical plane-rectangular NF–FF transformation from those collected along the spiral. Some experimental results, performed at the UNISA Antenna Characterization Lab and assessing the effectiveness of the technique, are reported.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/4519658
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact