A conjugate gradient contrast source technique for 3D profile inversion

A method for determination of the location, shape, and material properties of a 3D object from measurements of the scattered field, when the object is successively illuminated by a number of incident fields is presented. This work extends the method previously developed for reconstructions of 2D per mittivity and conductivity from electromagnetic measurements tu the more co mplicated full-vector 3D electromagnetic inversion. Furthermore, a frequenc y hopping strategy to improve the resolution of the unknown objects when th e frequency is raised. is underlined. Results of numerical experiments are presented to illustrate both strengths and weaknesses of the method.