In the scientific literature, a great deal of attention is paid to building the mathematical models of electromagnetic fields in composite materials in a homogeneous environment which contains a large number of small heterogeneities of different shapes and material compositions [1].Such models are reduced to solving boundary value problems for differential equations Maxwell with special kinds of particular boundary conditions on the structures of composite materials.In this context one of the important structures is the spatial screen and environment which is to simulate the actual boundary conditions pairing them [2][3][4][5][6]. Such models provide a mathematical foundation for solving problems of electromagnetic-field shielding composite screens, that are used to solve problems of electromagnetic compatibility of technical equipment in radio and electronics.