NDLI: Reconstruction of the far field radiated by an offset mounted volumetric AUT from non-redundant spherical spiral near-field measurements

Content Provider	IET Digital Library
Author	D'agostino, Francesco Ferrara, Flaminio Gennarelli, Claudio Guerriero, Rocco Migliozzi, Massimo
Abstract	The theoretical foundations of the near to far field transformation (NTFFT) techniques with spiral scannings have been properly applied to develop a non-redundant spherical spiral NTFFT which properly accounts for a mounting of a volumetric antenna under test (AUT) in an offset configuration, due to any practical constraints. Such an NTFFT, based on the non-redundant sampling representations of electromagnetic fields using spherical modelling of the AUT, requires the same number of near-field (NF) spiral data when the AUT is mounted both in onset and offset configuration because this number depends only on the area of the modelling sphere centred at the AUT centre. Moreover, it employs an efficient two-dimensional (2D) optimal sampling interpolation (OSI) formula to recover, from the spiral NF samples, the massive number of NF data required by the classical spherical NTFFT, which is related to the radius of the smallest sphere enclosing the AUT and centred at the scanning sphere centre. It is so possible to get a remarkable measurement time saving when the AUT is offset mounted. Numerical and experimental results, fully assessing the effectiveness of the developed NTFFT and the related 2D OSI algorithm, are shown.
Starting Page	1711
Ending Page	1718
Page Count	8
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 14, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2019.1004
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-03-31
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	2D OSI Algorithm Antenna Radiation Pattern Antenna Testing AUT Centre Electromagnetic Field Far-field Reconstruction Far-field Transformation Technique Interpolation Interpolation And Function Approximation Near-field Spiral Data NF Data Nonredundant Sampling Representations Nonredundant Spherical Spiral Near-field Measurement Nonredundant Spherical Spiral NTFFT Numerical Analysis Offset Configuration Offset Mounted Volumetric AUT Sampling Method Scanning Antenna Scanning Sphere Centre Single Antenna Spherical Modelling Spiral NF Sample Spiral Scannings Statistics Two-dimensional Optimal Sampling Interpolation Formula Volumetric Antenna under Test
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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