Abstract
Short carbon fibre-filled polychloroprene rubber composites vulcanized by barium ferrite were used for the measurement of electromagnetic interference (EMI) shielding effectiveness, at varying carbon fibre concentrations, aspect ratios and sample thicknesses, in the frequency range of 100 to 2000 MHz. The return loss values of the composites have also been studied at different carbon fibre concentrations and aspect ratios in the frequency range of 1100 to 2000 MHz. It was observed that at a particular frequency with increasing carbon fibre concentration the shielding effectiveness of the composite increases and return loss decreases. It was also observed that composites prepared by a cement mixed method with a high fibre aspect ratio (L/D ≃ 100) show a higher shielding effectiveness and lower return loss than composites prepared by a mill mixed method with a low fibre aspect ratio (L/D ≃ 25). This indicates that loss due to absorption increases with increase in carbon fibre concentration and aspect ratio. Correlation between shielding effectiveness and volume resistivity of the composites indicates that the shielding effectiveness depends not only upon the volume resistivity of the composite, but also on the aspect ratio and sample thickness.
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