Reduction of Truncation Error in the Near-Field-Far-Field Transformation with Planar Spiral Scanning

Authors: F. D’Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, G. Riccio, C. Rizzo

An elaborate and effective strategy for estimating the samples external to the measurement region in the planar spiral scanning is developed in this paper. It relies on the nonredundant sampling representations of the electromagnetic field and on the optimal sampling interpolation expansions of central type and uses the singular value decomposition method for extrapolating the outside samples. It is so possible to reduce the inevitable truncation error affecting the near-field reconstruction, thus giving rise to a more accurate far-field prediction. Numerical examples assess the effectiveness of the proposed technique.

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