Electromagnetic Wave Absorption Characteristics of Ceramic Panels Containing Carbon Powders

Abstract

Electromagnetic wave absorption characteristics and electrical resistivity of the 3∼5 mm thick ceramic specimens containing 14∼20 mass% of Bincho-charcoal powder and 4∼8 mass% of carbon black powder were measured by free space method and four probe method, respectively. The 3∼5 mm thick specimens containing 16% of Bincho-charcoal powder absorbed remarkably (about 30 dB) the electromagnetic waves of 4∼7 GHz. The 3∼5 mm thick specimens containing 5% of carbon black powder absorbed excellently (25∼40 dB) the electromagnetic waves of 4∼8 GHz. The electrical resistivities of the specimens containing16% of Bincho-charcoal powder and 5% of carbon black powder were 5×10³ Ω·cm and 1×10⁴ Ω·cm, respectively.