An Effective Near-Field to Far-Field Transformation with Planar Spiral Scanning for Flat Antennas under Test

The goal of this article is to provide numerical and experimental assessments of an effective near-field to far-field transformation (NF–FF T) technique with planar spiral scanning for flat antennas under test (AUTs), which requires a non-redundant, i.e., minimum, number of NF measurements. This tec...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2023-08, Vol.23 (16), p.7276
Main Authors: Bevilacqua, Florindo, D’Agostino, Francesco, Ferrara, Flaminio, Gennarelli, Claudio, Guerriero, Rocco, Migliozzi, Massimo, Riccio, Giovanni
Format: Article
Language:English
Subjects:
Algorithms
Analysis
Antennas
Antennas (Electronics)
antennas measurements
Bandwidths
Electromagnetic fields
Electromagnetism
Information management
near-to-far-field transformations
non-redundant sampling representations
Numerical analysis
planar spiral scanning
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Summary:The goal of this article is to provide numerical and experimental assessments of an effective near-field to far-field transformation (NF–FF T) technique with planar spiral scanning for flat antennas under test (AUTs), which requires a non-redundant, i.e., minimum, number of NF measurements. This technique has its roots in the theory of non-redundant sampling representations of electromagnetic fields and was devised by suitably applying the unified theory of spiral scans for non-volumetric antennas to the case in which the considered AUT is modeled by a circular disk having its radius equal to half of the AUT’s maximum dimension. It makes use of a 2D optimal sampling interpolation (OSI) formula to accurately determine the massive amount of NF data required by the classical plane-rectangular NF–FF T technique from the non-redundant data gathered along the spiral. It must be emphasized that, when considering flat AUTs, the developed transformation allows one to further and significantly save measurement time as compared to that required by the previously developed NF–FF T techniques with planar spiral scans based on a quasi-planar antenna modeling, because the number of turns of the spiral and that of NF data to be acquired depend somewhat on the area of the modeling surface. The reported numerical simulations assess the accuracy of the proposed NF–FF T technique, whereas the experimental tests prove its practical feasibility.
ISSN:1424-8220
1424-8220
DOI:10.3390/s23167276