The electromagnetic wave (EM) absorption properties of various particle size have been investigated in a sheet-type absorber using the $Fe_{73}Si_{16}B_{7}Nb_{3}Cu_{1}$ alloy powder. With decreasing the average particle size, the complex permeability (${mu}_{r}$) and permittivity (${varepsilon}_{r}$) increased and the matching frequency is shifted toward lower frequency. The fabricated EM wave absorbers showed permeability $2{sim}6$, permittivity $17{sim}23$ for a $-325{sim}+400$ mesh sample, and the calculated power absorption was as high as 80% in the frequency range over 2 GHz.