Abstract
Frequency dependences of transmission and reflection coefficients, dielectric permeability of composite materials with the various content of carbon fillers (technical carbon, graphite) in polyurethane varnish in ranges of frequencies 26–40 GHz and 110–260 GHz are experimentally investigated. It was found that composite material 0.4 mm thick with 4–5 % graphite mass content has a transmission coefficient of less than minus 7 dB in the whole investigated range of frequencies and can be effectively used in devices of protection from electromagnetic radiation.
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