An efficient NF-FF transformation technique with plane-polar scanning: Experimental assessments

The experimental assessment of an effective near-field - far-field (NF-FF) transformation technique with plane-polar scanning, which requires a nonredundant, i.e. minimum, number of NF data, is provided in this communication. Such a technique relies on the nonredundant sampling representations of the electromagnetic fields and, to shape the antenna, adopts a surface formed by two circular bowls with the same aperture diameter, but eventually different bending radii of the upper and lower arcs. An optimal sampling interpolation algorithm allows the efficient reconstruction of the NF data needed by the classical NF-FF transformation with plane-rectangular scanning from the acquired nonredundant plane-polar ones. A remarkable measurement time saving is so obtained.