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A novel methodology for the reconstruction of the profile and constitutive parameters of unknown Objects-Under-Test (OUTs) using amplitude-only measurements is presented. A cost function quantifying the mismatch between the amplitude of the measured electric field and the field scattered by a model of the OUT is minimized through the Particle Swarm Optimization (PSO) in order to retrieve the parameterization...
An error characterization tool is presented in this contribution to study the effect of mechanical and positioning errors in the near-field to far-field transformation and the computation of the aperture field processes in different planar measurement setups. Validation of the error simulation tool is made by comparison of the results with a set of measurements in a planar near-field range.
An inverse scattering method based on the Surface Equivalent Principle and the use of Genetic Algorithms is presented in this contribution. This technique is used for the estimation of constitutive parameter of homogenous dielectrics with any permittivity and conductivity. The dielectric under test is illuminated with a set of plane waves at a single frequency, under 2D TM case assumption. The dielectric...
A two steps strategy is presented for phaseless antenna diagnosis. In the first step, an antenna setup derived from Leith-Upatnieks holography with synthesized reference wave is used to retrieve the phase of an amplitude-only measurement. Instead of using a phase shifter to synthesize the phase of the reference wave, a set of mechanical shifts are applied to the probe to produce the same effect. As...
A setup for phaseless microwave imaging is presented in this paper. The setup is based on the Leith-Upatnieks or off-axis holography in which the scattered signal is combined with a reference signal that is known in both amplitude and phase. The reference signal is synthesized by a mechanical movement of the object under test together with the injection of a constant signal. Thus, previous measurement...
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