Abstract
The investigation of the electromagnetic shielding properties of composites based on epoxy resin L285 and hybrid filler graphite nanoplatelets/BaTiO3 particles (GNP/BT) has been performed in the frequency range of 1–67 GHz. The experimental study involved measuring direct current (DC) conductivity, complex permittivity (versus frequency), and shielding properties of such composite materials with 0, 3, 5 and 6 wt% contents of graphite nanoplatelets and 35 wt% of BaTiO3 particles in the composite. The significant increase of permittivity was observed in the ternary epoxy composites GNP/BT/epoxy with the increase of GNP content. The observed sufficient increase of electromagnetic radiation (EMR) shielding in Ka-band for high GNP content correlates with DC electrical conductivity increase. The simulation of the reflection loss in such composites in EMR frequency range of 1–67 GHz has been performed in C++ environment using experimentally determined permittivity frequency dependence. The influence of sample thickness on position, width, and depth of EMR absorption maximums was defined for the composites with 0, 3, 5 and 6 wt% content of graphite nanoplatelets and 35 wt% of BaTiO3 filler.
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