Abstract
Background: This paper provides the experimental validation of an efficient iterative procedure to correct known position errors in a spherical near to far-field (NTFF) transformation for elongated antennas which uses a minimum number of NF measurements. Method: This transformation exploits a non-redundant sampling representation of the voltage detected by the probe obtained by shaping a long antenna with a prolate ellipsoid. The uniform samples, those at the points set by the representation, are accurately reconstructed from the acquired not regularly distributed (non-uniform) ones by using an iterative scheme, which requires a one to one relationship between each uniform sampling point and the corresponding non-uniform one. Then a 2-D optimal sampling formula is adopted to evaluate the input data needed to perform the traditional spherical NTFF transformation from the retrieved non-redundant uniform samples. Conclusion: Finally, laboratory proofs have been reported to demonstrate the validity of the presented technique from a practical viewpoint.
Highlights
Near to far-field (NTFF) transformation techniques are widely employed tools for the prediction of the antenna FF pattern from NF measurements [1 - 4]
The traditional spherical NTFF transformation has been properly optimized in [13] by taking into account that the electromagnetic (EM) fields radiated by finite sizes sources are spatially quasi-bandlimited functions [17]
This has made possible to rigorously determine the highest spherical wave to be considered, instead to fix it according to the rule of the minimum sphere, i.e., the smallest one containing the Antenna Under Test (AUT)
Summary
Near to far-field (NTFF) transformation techniques are widely employed tools for the prediction of the antenna FF pattern from NF measurements [1 - 4] Among these techniques, the one wherein the NF data are acquired over a spherical surface [5] is the most appealing because of its unique feature to allow the reconstruction of the whole antenna radiation pattern avoiding the measurement area truncation. The traditional spherical NTFF transformation has been properly optimized in [13] by taking into account that the electromagnetic (EM) fields radiated by finite sizes sources are spatially quasi-bandlimited functions [17] This has made possible to rigorously determine the highest spherical wave to be considered, instead to fix it according to the rule of the minimum sphere, i.e., the smallest one containing the Antenna Under Test (AUT). This paper provides the experimental validation of an efficient iterative procedure to correct known position errors in a spherical near to far-field (NTFF) transformation for elongated antennas which uses a minimum number of NF measurements
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