Determination of dielectric distribution of a two-dimensional anisotropic cylinder with multilayer structure

The algorithm for determining the dielectric distribution of a two-dimensional anisotropic cylindrical object is investigated using the unrelated illumination method along with the method of moments. In the study, a knowledge of the principal axes is no longer a prerequisite, which makes this scheme more attractive practically. Satisfactory reconstruction has been obtained for cylinders with off-principal axes. In addition, the influences of the noise level on the scheme are studied. The off-diagonal terms in the permittivity tensor are found to be more sensitive to the noise than are the diagonal terms. Therefore, they are the critical parts in obtaining good inversion. Finally, this scheme can now be applied to cylinders of arbitrary cross-section with a multilayer structure, for which the principal axes of each layer can be different.