磁性・誘電性複合体の電波吸収特性

抄録

In recent years, because of the rapid progress in wireless technology, microwave absorbers or noise suppressors have become necessary for a safe-electromagnetic-wave-level environment. To design microwave absorbers or noise suppressors, it is necessary to have knowledge of complex permittivity, ε_r^* and permeability, μ_r^*. In this report, we show the values of complex permeability, μ_r^* and permittivity, ε_r^* for a composite materials of magnetic (Iron, Fe, coated by Fe₃O₄) and dielectric (Titanium Oxide, TiO₂), by changing Fe / TiO₂ volume fraction ratio. As changing of these, we can change the values of complex permeability (μ_r^* = μ_r' - jμ_r") and complex permittivity (ε_r^* = ε_r' - jε_r"). And the results are applied in the design of a microwave absorber which makes reflection losses and the central frequency to do a purpose, for example, necessary conditions of ETC (5.8GHz) use in Japan.