備長炭および竹炭粉末を含む不飽和ポリエステル樹脂の電磁波吸収特性

概要

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Electromagnetic wave absorption characteristics and electrical resistivities of the unsaturated polyester specimens containing 20-60 mass% of Bincho-charcoal and 10-42.5 mass% of bamboo charcoal powders were measured. The specimens containing 33.3-50.0% of Bincho-charcoal powder absorbed remarkably the electromagnetic wave of the frequency range of 2.5-3.5 GHz and the specimens containing 12.1-18.0% of bamboo charcoal powder also absorbed remarkably that of the frequency range of 4.0-15 GHz. The specimens which showed the remarkable absorptions had the electrical resistivities of the range of 103-102Ω · cm and therefore these electrical resistivity values seems to have been suitable for converting the energy of the electromagnetic wave at the above frequency range into the energy of heat.