Title :
Photonic Probes and Advanced (Also Phaseless) Near-Field Far-Field Techniques
Author :
Capozzoli, A. ; Curcio, C. ; Elia, G.D. ; Liseno, A. ; Vinetti, P. ; Ameya, M. ; Hirose, M. ; Kurokawa, S. ; Komiyama, K.
Author_Institution :
Dipt. di Ing. Biomedica, Elettron. e delle Telecomun. (DIBET), Univ. di Napoli Federico II, Naples, Italy
Abstract :
We present innovative near-field test ranges, named compact-near-field (CNF) and very-near-field (VNF). These use photonic probes, and advanced near-field far-field (NFFF) transformations from amplitude and phase (complex) or phaseless measurements. The photonic probe allows AUT-probe distances of less than one wavelength. This drastically reduces test-range and scanner dimensions, improves the signal-to-clutter ratio and the signal-to-noise ratio, and reduces the scanning area and time. In both the cases of complex and phaseless measurements, the neat-field-to-far-field transformation problem is properly formulated to further improve the rejection of clutter, noise, and truncation error. The advantages of the compact-near-field and very-near-field test ranges are discussed and numerically analyzed. Experimental results are presented for both planar and cylindrical scanning geometries.
Keywords :
probes; radar clutter; amplitude measurements; compact-near-field; cylindrical scanning geometries; near-field far-field techniques; near-field far-field transformations; near-field test ranges; neat-field-to-far-field transformation; phase measurements; phaseless measurements; photonic probes; planar scanning geometries; signal-to-clutter ratio; signal-to-noise ratio; very-near-field; Apertures; Finite wordlength effects; Phase measurement; Photonics; Probes; Antenna measurements; antenna radiation patterns; compact range; near-field far-field transformations; phaseless; photonic sensors; singular value decomposition; singular value optimization; very near field;
Journal_Title :
Antennas and Propagation Magazine, IEEE
DOI :
10.1109/MAP.2010.5687550