Regularization of permittivity profiles reconstructed by a spectral inverse scattering scheme

A spectral inverse technique, applying the moment‐method procedure with a series expansion for the induced field in each enlarged cell, is suggested to reconstruct permittivity profiles of inhomogeneous dielectric objects. In particular, averaging the reconstructed permittivity distribution over each cell with a weighting function becomes an effective tool to regularize the error arising from a Gaussian random noise of the scattered field.