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Fast and accurate near-field-far-field transformation by sampling interpolation of plane-polar measurements

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3 Author(s)
Bucci, O.M. ; Dipartimento di Ingegneria Elettronica, Napoli Univ., Italy ; Gennarelli, C. ; Savarese, C.

An optimal sampling interpolation algorithm which allows the accurate recovery of plane-rectangular near-field samples from the knowledge of the plane-polar ones is developed. This enables the standard near-field-far-field (NF-FF) transformation, which takes full advantage of the fast Fourier transform (FFT) algorithm, to be applied to plane-polar scanning. The maximum allowable sample spacing is also rigorously derived, and it is shown that it can be significantly greater than λ/2 as the measurement place moves away from the source. This allows a remarkable reduction of both measurement time and memory storage requirements. The sampling approach is compared with that based on the bivariate Lagrange interpolation (BLI) method. The sampling reconstruction agrees with the exact results significantly better than the BLI, in spite of the significantly lower number of required measurements

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:39 ,  Issue: 1 )

Date of Publication:

Jan 1991

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