Reconstruction of a large and high-contrast penetrable object by using the genetic and Levenberg-Marquardt algorithms

Abstract

A large and high-contrast two-dimensional dielectric object is reconstructed from the measured scattered fields by using a hybrid optimization algorithm combining the genetic algorithm and the Levenberg–Marquardt algorithm. Ill-posedness is filtered out by using the effective angular modes excluding the evanescent modes, and multiple incidences of plane waves of multifrequencies are used to reconstruct a dielectric object of its size, 3×3 wavelengths, and its relative permittivity 4.0 in presence of 10% Gaussian noise in the scattered fields. Object size is enlarged by using the large discretized cells up to 0.5 wavelength divided by the square root of relative permittivity. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 17–21, 1997.