Minimization of the backward scattering from dielectric structures

Numerical results are presented which enable one to minimize the backward scattering from dielectric cylinders by the proper selection of the polygon cross-section, size, orientation and dielectric constant. Both E- and H-polarization are considered. The problem of the complex-point line source directive beam scattering by a dielectric polygonal cylinder is solved by a boundary integral equations method combined with a method of analytical regularization and a conformal mapping technique for presenting the parametric equations of the scatterer contour in terms of a rapidly convergent infinite series. It is shown that triangular cross-sections are not appropriate to the minimization of backward scattering in the H-polarization case. Absolute minima are found for square and circular cross-section shapes.