The complex permittivity and permeability of the materials with bincho charcoal powder and silicon are measured at the frequencies from 800MHz to 4GHz. The measured data are compared with the conventional materials for the electromagnetic wave absorber. The imaginary part of permittivity is large compared with the conventional materials for absorber. The reflection losses of single-layer type absorber with 40% bincho charcoal and 6-layer type absorber with six different mixing rates are calculated by using FDTD method. More than 17dB of the incident power is absorbed within the 6-layer absorber of 30mm in thickness.
