This research was used 1~25% Mn-Zn ferrite powder and Unsaturated Polyester resin to make electromagnetic wave absorbing composite materials. Then use 100% stainless steel yarn and aluminum foil to make electromagnetic wave absorbing sheets to fold on the. Mn-Zn ferrite composite materials to Improve decrease effect. In this research, the best decrease rate are at 2.2GHz~8.5GHz. Then the decrease rate of the Mn-Zn ferrite composite materials have absorbing sheets are better than no absorbing sheets, about increase 5~12%.
