Inverse problem for structures having both continuous permittivity variation intervals and steps

The effective method for reconstruction of permittivity profile of structures having both intervals of continuous ε(x) distribution and sharp interfaces is proposed. The method is nonstandard modification of Newton-Kantorovich iterative scheme applied to Riccati differential equation supposing piecewise-square-hyperbolic permittivity profile. The modification is compared with previously developed one supposing piecewise-constant permittivity profile on numerically synthesized reflection-coefficient data for complicated structure.