Beam reflection from multilayers with periodic and fractal distributions

An impedance model is used to solve the reflection problem from a multilaye r with periodic and Canter bar fractal distributions. It is based on the ca lculation of the input surface impedance of such a structure. The method co nsists of replacing the multilayer reflection problem by a simple reflectio n problem on a single surface. This approach has the additional advantage t hat only the fields above the surface should be taken into account. Numeric al calculation leads to an iterative method which can be implemented for ea ch polarization mode. The results for the input impedance function of the s ystem and for the reflectance are presented for different iteration states. Also to quantify the comparison between both types of structures we introd uce a self-similarity function which correlates orders or states of the sam e type.