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A near-field/far-field transformation for circular aperture antennas, formulated as a linear inverse problem, is here proposed. The approach takes into account for the a-priori information about the radiating and geometrical characteristics of the antennas under test, by representing the aperture field with Circular Prolate Spheroidal Wave functions.
A method for the array characterization from Near-Field measurements is here presented. The method exploit the concept of Singular-Value Optimization to dramatically reduce the number of data needed by a complete mapping of the excitations. The approach is here applied to a planar scanning and numerically validated.
We propose a stable and accurate method for the numerical calculation of Prolate Spheroidal Wave Functions (PSWFs) having circular support in both the spatial and spectral domains. Such PSWFs are used to represent the aperture field of circularly shaped aperture antennas and expoited in a Near-Field/Far-Field transformation algorithm. The results show how the quality of the reconstructions can profit...
Recently the Near-Field/Far-Field transformation has been formulated as a linear inverse problem so to obtain unprecedented performance. In particular, the measurement points are chosen as the ones optimizing the singular value behavior of the relevant operator. Here the attention is focused on the residual ill-conditioning that could affect the inversion process even after the optimization of the...
An optimized Near-Field/Far-Field transformation technique for the characterization of aperture antennas in cylindrical geometry is here presented. The approach is based on the one discussed in [4,9]. The basic idea is to reduce the Near-Field/Far-Field transformation to a linear inverse problem, wherein the number and the locations of the measurements points are found as the ones optimizing the behavior...
The paper presents an innovative method for the diagnosis of reflector antennas for radio astronomical applications in terms of feed misalignment. The method optimizes the number and the location of the far field sampling points exploited to retrieve the antenna status in order to reduce the time required for the measurement. The goal is achieved by introducing a relevant linear operator connecting...
An optimized Near-Field/Far-Field (NFFF) transformation technique for the characterization of aperture antennas in spherical geometry is presented. The optimized approach introduced by the Authors for the planar geometry is extended to the spherical one. The transformation is formulated as a linear inverse problem, and the number and the locations of the sampling points are chosen as the ones optimizing...
An optimized Near-Field/Far-Field (NFFF) transformation technique for the characterization of aperture antennas in spherical geometry is here presented. In particular, the approach introduced in [5,6] for the planar geometry is extended to the spherical one. The NFFF transformation is formulated as a linear inverse problem, and the number and the locations of the sampling points over the measurement...
We propose an approach to the design of array-based, 2D echo generators. The radiating elements are located on non-uniform grids and the quiet zone (QZ) design specifications are enforced at non-uniformly spaced sampling locations. The approach, based on a singular values optimization process, allows dimensioning the size of the echo generator to meet the QZ specifications, defining the number and...
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