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The paper presents results of study of frequency dependence of permittivity and permeability of composite materials based on various polymer matrices and fillers in the form of nanoscale powders — nanoparticles of Si, carbon nanotubes, and magnetite nanoparticles. It is shown that, using the nanodisperse electrically conducting fillers, it is possible to obtain materials with the required dielectric...
The paper presents some results of studies of radioabsorbing materials of meter and decimeter wavelength range on the basis of ferrites, as well as composite materials based on them. Some technology aspects of modified ferrites are given in account; the techniques of the determinations dispersion of the material parameters (complex permittivity and permeability) are discussed. Example of complex permeability...
The paper presents the main approaches and results in the improvement of broadband and ultrawideband (UWB) radio absorbing materials used for UWB systems. New composite materials on the basis of polyurethane foam and new ultradispersed carbonic fillers are developed. The frequency dispersion of dielectric permittivity of the received materials has been investigated. The effectiveness of gradient-resistance...
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