Some approaches to the development of absorbing materials for ultrawideband systems

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 absorbers with the use of ultra-dispersed graphite fillers of new generation has been confirmed. The way of decrease in frequency of a resonance of domain walls in MHz area has been found to expand a frequency range of radio absorbing materials down.