Pyramid-shaped Electromagnetic Wave Absorber Containing Plant-carbonized Powder for Millimeter-wave Band

The authors previously investigated polymer composite materials containing plant-carbonized powder, which comes from agricultural by-products, to develop an effective industrial use for agricultural resources. In this study, we prepared a pyramid- shaped electromagnetic wave absorber containing plant-carbonized powder on an injection-molded sheet. The EM wave absorption characteristics in the millimeter-wave band were then assessed by considering the effects of the pyramid shape and powder mixing ratio. Results indicated that their reflection characteristics were almost the same as those of common EM wave absorbers.