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This study is the use of a conductive loss principle, in 3D polyester fabric substrate to a conductive, magnetic powder as a filler, an unsaturated polyester resin and reinforcing materials as establish conditions Rab, and a flat plate-type electromagnetic wave absorber as the structure of the design basis, the conductive, magnetic powder added into the aromatic polyamide fiber composites / 3D perspective of the polyester fabric, the design of a plate-type electromagnetic wave absorber, in 3D fabric 0.1cm, 0.3cm, 0.5cm of the fabric in three different apertures, 0.1cm, 0.3cm, 0.5cm five different fabric thickness, in the respective unsaturated polyester resin impregnated with added conductive, magnetic powder of an unsaturated polyester resin, and the 3D three-dimensional polyester resin paste down and establish conditions Labrador, made of electromagnetic wave absorbing composite sheet. Analysis and Discussion of electromagnetic waves by their respective composite sheet made of impact absorbing effect and influence on the mechanical properties of the electromagnetic wave absorption, establish conditions in different proportions Labrador conductive coating, magnetic powder, Analysis and Discussion of the electromagnetic wave absorbing composite sheet made of , effect of electromagnetic wave absorption and mechanical properties. From the experimental results, the best 3D using a polyester fabric having a thickness of 0.5cm, the best 3D polyester fabric pore size 0.5cm, unsaturated polyester resin, 15% by weight of added carbon powder is best case, optimal conditions were thus three kinds of polyester fabric composite sheet made of 3D, made of aromatic polyamide fiber / 3D polyester fabric composite plates, electromagnetic wave absorption band of 4.1GHz-8.5GHz, electromagnetic wave absorption is 41dB, the 300MHz-8.5GHz, 59% higher than the absorption of electromagnetic waves 5dB. Without added carbon powder made of aromatic polyamide fiber / 3D perspective polyester fabric composite sheet, the maximum stress of 59.3MPa, and the maximum strain of 0.25. But only 15% of active carbon powder added in 3D stereo polyester fabric, made from aromatic polyamide fiber / 3D three-dimensional polyester fabric composite sheet, the maximum stress of 46.5MPa, while the maximum strain of 0.37. The individual in the 3D polyester fabric add 15% active carbon powder with an aromatic polyamide fiber 10% activated carbon, made from aromatic polyamide fiber / 3D three-dimensional polyester fabric composite sheet, the maximum stress was 49MPa, the maximum strain of 0.39. Pure composite sheet made of unsaturated polyester resin, impact strength is 11.4583kg-cm, without adding aromatic polyamide fiber made of activated carbon powder / 3D three-dimensional polyester fabric composite sheet, the impact strength of 79.4095kg-cm , made of aromatic polyamide fiber / 3D three-dimensional polyester fabric composite sheet, the impact strength of 77.3991kg-cm, while the individual in the 3D add 15% polyester fabric with an aromatic polyamide fiber active carbon powder with 10% active carbon, made from poly-aromatic polyamide fiber / 3D three-dimensional polyester fabric composite sheet, the impact strength of 75.1586kg-cm.
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