Performance improvement of an inversion algorithm for the reconstruction of lossy dielectric cylinder

This paper considers the performance improvement of an iterative inversion algorithm of reconstructing the relative permittivity of a lossy dielectric cylinder using the modified frequency-hopping technique and the adaptive regularization method. A cost functional is defined as the sum of a residual error term in the scattered electric field and an additional regularization term. Then the electromagnetic inverse scattering problem can be treated as an optimization problem, where the relative permittivity of the object is determined by minimizing the cost functional. Numerical results for lossy dielectric circular cylinders show the performance comparison between the proposed method and the conventional one.