Abstract: Flat panel elements are placed ahead of structural parts reflecting electromagnetic waves, in the region of radar waves, in order to provide an absorption or reduction of the reflection. For this purpose electrically and/or magnetically conducting materials are embedded into an insulating material in order to form areas of conductivity. The dimensions of these areas of conductivity in all planes are at least 1000 times smaller than the wavelength of the waves to be absorbed, and the electrically and/or magnetically conducting materials amount up to 40% of the weight of the panel area elements.

Abstract: It is intended to arrange a thermal barrier layer ahead of structural parts reflecting electromagnetic waves in the region of radar waves, in order to provide an absorption or a reduction of the reflection. For this purpose electrically and/or magnetically conductive materials are embedded in a material from an electric insulator for forming conductive regions. The dimensions of these conductive regions are in all planes at least a thousand times smaller than the wavelengths of the waves to be absorbed, wherein the electrically and/or magnetically conductive materials comprise a share of up to 10% of the volume of the thermal barrier layer. Herein it is provided to design the upstream cover from an electric insulator.