An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning

A direct near-field-far-field transformation with helicoidal scanning is developed. It is based on the nonredundant sampling representation of electromagnetic fields and uses a spherical antenna modelling to determine the number of helix turns. Moreover, the number of voltage samples on each of them...

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Main Authors:	Francesco D’Agostino, Flaminio Ferrara, Claudio Gennarelli, Rocco Guerriero, Massimo Migliozzi
Format:	Article
Language:	English
Published:	Hindawi Limited 2012-01-01
Series:	International Journal of Antennas and Propagation
Online Access:	http://dx.doi.org/10.1155/2012/912948

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spelling	doaj-7707cdd474f5461cae86b4d782937ab92020-11-25T00:04:03ZengHindawi LimitedInternational Journal of Antennas and Propagation1687-58691687-58772012-01-01201210.1155/2012/912948912948An Innovative Direct NF-FF Transformation Technique with Helicoidal ScanningFrancesco D’Agostino0Flaminio Ferrara1Claudio Gennarelli2Rocco Guerriero3Massimo Migliozzi4Department of Electronic and Computer Engineering, University of Salerno, via Ponte Don Melillo, I-84084 Fisciano (Salerno), ItalyDepartment of Electronic and Computer Engineering, University of Salerno, via Ponte Don Melillo, I-84084 Fisciano (Salerno), ItalyDepartment of Electronic and Computer Engineering, University of Salerno, via Ponte Don Melillo, I-84084 Fisciano (Salerno), ItalyDepartment of Electronic and Computer Engineering, University of Salerno, via Ponte Don Melillo, I-84084 Fisciano (Salerno), ItalyDepartment of Electronic and Computer Engineering, University of Salerno, via Ponte Don Melillo, I-84084 Fisciano (Salerno), ItalyA direct near-field-far-field transformation with helicoidal scanning is developed. It is based on the nonredundant sampling representation of electromagnetic fields and uses a spherical antenna modelling to determine the number of helix turns. Moreover, the number of voltage samples on each of them is fixed by the maximum transverse dimension of the antenna, both to simplify the mechanical scanning and to reduce the computational effort. This technique allows the evaluation of the antenna far field directly from a minimum set of near-field data without interpolating them. Although the number of near-field data employed by the developed technique is slightly increased with respect to that required by rigorously applying the nonredundant sampling representation on the helix, it is still remarkably smaller than that needed by the standard near-field-far-field transformation with cylindrical scanning. The effectiveness of the technique is assessed by numerical and experimental results.http://dx.doi.org/10.1155/2012/912948
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Francesco D’Agostino Flaminio Ferrara Claudio Gennarelli Rocco Guerriero Massimo Migliozzi
spellingShingle	Francesco D’Agostino Flaminio Ferrara Claudio Gennarelli Rocco Guerriero Massimo Migliozzi An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning International Journal of Antennas and Propagation
author_facet	Francesco D’Agostino Flaminio Ferrara Claudio Gennarelli Rocco Guerriero Massimo Migliozzi
author_sort	Francesco D’Agostino
title	An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning
title_short	An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning
title_full	An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning
title_fullStr	An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning
title_full_unstemmed	An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning
title_sort	innovative direct nf-ff transformation technique with helicoidal scanning
publisher	Hindawi Limited
series	International Journal of Antennas and Propagation
issn	1687-5869 1687-5877
publishDate	2012-01-01
description	A direct near-field-far-field transformation with helicoidal scanning is developed. It is based on the nonredundant sampling representation of electromagnetic fields and uses a spherical antenna modelling to determine the number of helix turns. Moreover, the number of voltage samples on each of them is fixed by the maximum transverse dimension of the antenna, both to simplify the mechanical scanning and to reduce the computational effort. This technique allows the evaluation of the antenna far field directly from a minimum set of near-field data without interpolating them. Although the number of near-field data employed by the developed technique is slightly increased with respect to that required by rigorously applying the nonredundant sampling representation on the helix, it is still remarkably smaller than that needed by the standard near-field-far-field transformation with cylindrical scanning. The effectiveness of the technique is assessed by numerical and experimental results.
url	http://dx.doi.org/10.1155/2012/912948
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An Innovative Direct NF-FF Transformation Technique with Helicoidal Scanning

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