Abstract. The progress of telecommunications systems, microelectronics
and radio electronics requires the development of materials for effectively
shielding and absorbing electromagnetic radiation. The use of metal screens is
limited because the reflected radiation causes interference and disables a
sensitive device. Radar absorbing materials and coatings significantly reduce
the radiation which reflected from the metal screens.
The one of approaches to the coordination of wave resistance is the
creation of multilayer coatings, in which the wave resistance decreases with
passage of radiation into the coating. To solve the problem of optimal choice
of parameters of radar absorbing materials was performed the mathematical
simulation of the frequency characteristics of reflection coefficients using a
model of multilayer coatings. Calculations were performed for various
combinations of conductivity and thickness of composite layers on metal and
Experimental investigations were made of the samples of composite
materials based on polyvinylchloride elastron with dioctylphtalate plasticizer.
The filler used is thermally expanded graphite, annealed powder of barium
titanate, colloidal graphite powder, amorphous magnetic alloy based on cobalt. We
investigated the options of coatings consisted of two layers of the absorbent
composite with different mass concentration of thermally expanded graphite and
a layer of the underlying dielectric material with
ε ≈ 4...10, in which the
composition of the filler was varied.
The reflection coefficients in the microwave range confirms the
conclusions, made as a result of the experiments, that there is the feasibility
of developing and forming of materials with gradient distribution of
conductive, dielectric and magnetic fillers in the polymer matrix.
radar absorbing materials and coatings, the gradient composite materials,
electrophysical characteristics, the reflection coefficient.
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