The paper is focused on numerical studies of electromagnetic properties of composite materials used for the construction of small airplanes. Discussions concentrate on the homogenization of composite layers with metal lattice and com posite layers with metal lattice with a slot. The homogenization is aimed to reduce CPU-time demands of EMC computational models of electrically large airplanes. First, a methodology of creating a 3-dimensional numerical model of a composite material with metal lattice in CST Microwave Studio is proposed focusing on a sufficient accuracy of the model. Second, two different approaches to homogenizing the composite with metallattice are discussed. The proposed approaches are evaluated and com pared from the viewpoint of the efficiency, the accuracy, the convergence, and hardware requirements. The obtained field distribution is com pared with the distribution com puted for the original com posite walls.
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