Recent Advances in Near-Field to Far-Field Transformation Techniques

Gennarelli, Claudio; Capozzoli, Amedeo; Foged, L. J.; Fordham, Jeff; Rensburg, Daniël Janse van

doi:10.1155/2012/243203

Cited by 50 publications

(33 citation statements)

References 5 publications

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“…The two-dimensional OSI expansion to reconstruct the voltage at any point on the sphere is then obtained by matching the one-dimensional ones (6) and (11), thus getting:…”

Section: Nmentioning

confidence: 99%

Experimental Testing on an Effective Technique to Reconstruct the Far- Field Pattern of a Long Antenna from Near-Field Measurements Acquired via Spherical Spiral Scan

D’Agostino¹,

Ferrara²,

Gennarelli³

et al. 2014

TOEEJ

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Abstract:In this paper, the experimental validation of a fast and accurate near-field -far-field (NF-FF) transformation with spherical spiral scanning for elongated antennas is provided. Such a transformation relies on a nonredundant sampling representation of the voltage measured by the probe, obtained by using the unified theory of spiral scans for nonspherical antennas and adopting a cylinder ended in two half-spheres to model long antennas. It allows a remarkable reduction of the measurement time due to the use of continuous and synchronized movements of the positioning systems and to the reduced number of needed NF measurements. In fact, the NF data required by the classical spherical NF-FF transformation are efficiently and accurately recovered from those collected along the spiral, by using an optimal sampling interpolation expansion. Experimental results, obtained at the Antenna Characterization Lab of the University of Salerno and assessing the effectiveness of such a NF-FF transformation, are shown.

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“…The two-dimensional OSI expansion to reconstruct the voltage at any point on the sphere is then obtained by matching the one-dimensional ones (6) and (11), thus getting:…”

Section: Nmentioning

confidence: 99%

Experimental Testing on an Effective Technique to Reconstruct the Far- Field Pattern of a Long Antenna from Near-Field Measurements Acquired via Spherical Spiral Scan

D’Agostino¹,

Ferrara²,

Gennarelli³

et al. 2014

TOEEJ

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“…The antenna measurement people community has spent over the years many efforts to satisfy the ever growing demand of innovative solutions to the open issues [4]. Among them, the reduction of the time needed for the NF data acquisition is assuming a significant importance, since such a time is currently very much greater than that required to perform the transformation.…”

Section: Introductionmentioning

confidence: 99%

Far-Field Reconstruction From Near-Field Data Acquired via a Fast Spherical Spiral Scan: Experimental Evidences

D’Agostino¹,

Ferrara²,

Gennarelli

et al. 2013

PIER

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Abstract-A probe-compensated near-field-far-field (NF-FF) transformation with spherical spiral scanning, which makes possible to lower the number of needed measurements, as well as the time required for the data acquisition when characterizing quasi-planar antennas, is experimentally verified in this paper. Such a technique, based on the nonredundant representation of electromagnetic fields, has been achieved by properly applying the unified theory of spiral scans for nonspherical antennas and adopting a very flexible source modelling, formed by two circular "bowls" with the same aperture diameter but different bending radii. A two-dimensional optimal sampling interpolation formula allows one to reconstruct the NF data at any point on the measurement sphere and, in particular, at those required by the classical NF-FF transformation with spherical scanning. The reported NF and FF reconstructions, obtained from the nonredundant samples acquired on the spiral, assess the accuracy of the proposed technique.

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“…Near field -far field (NF-FF) transformation techniques have been widely employed in the last forty years, because they allow to overcome the drawbacks which make unpractical the measurement of antenna radiation patterns in a FF range [1][2][3][4]. Among them, the NF-FF transformation with spherical scanning (Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of a nonredundant NF-FF transformation with spherical scanning for elongated antennas

D’Agostino

Ferrara

Gennarelli

et al. 2013

2013 International Conference on Electromagnetics in Advanced Applications (ICEAA)

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This work provides the experimental validation of a near field — far field (NF-FF) transformation technique with spherical scanning for electrically long antennas, which requires a nonredundant number of NF data. Such a technique is based on the nonredundant sampling representations of the electromagnetic fields and uses a prolate ellipsoid to shape an elongated antenna. A two-dimensional optimal sampling interpolation formula is employed to accurately recover the NF data required by the classical spherical NF-FF transformation from the acquired nonredundant NF data. It is so possible to obtain a remarkable reduction of the measurement time. Some experimental results, carried out at the UNISA Antenna Characterization Lab and assessing the effectiveness of the proposed technique, are shown

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Recent Advances in Near-Field to Far-Field Transformation Techniques

Cited by 50 publications

References 5 publications

Experimental Testing on an Effective Technique to Reconstruct the Far- Field Pattern of a Long Antenna from Near-Field Measurements Acquired via Spherical Spiral Scan

Experimental Testing on an Effective Technique to Reconstruct the Far- Field Pattern of a Long Antenna from Near-Field Measurements Acquired via Spherical Spiral Scan

Far-Field Reconstruction From Near-Field Data Acquired via a Fast Spherical Spiral Scan: Experimental Evidences

Experimental verification of a nonredundant NF-FF transformation with spherical scanning for elongated antennas

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