| 초록 |
EMI shielding has been considering a significant issue in our daily lives. Sheet molding compound (SMC) is both a process and reinforced composite material. This is manufactured by dispersing long strands of chopped fiber. The longer fibers in SMC result in better mechanical properties than standard bulk molding compound (BMC) process. In this study, we prepared aluminum coated glass fiber (MGF) by dip-coating process. Epoxy/MGF composites have been fabricated to evaluate their EMI SE. The effect of fiber content and length on electrical properties of the composites was studied by electrical resistivity and EMI shielding measurements. The electrical conductivity was obtained by measuring the surface resistance. The permittivity, permeability and EMI SE were investigated by using S-parameter in the range of 100 ~ 1500 MHz. The EMI SE of conductive composites is 68 dB over a wide frequency range up to 1.5 GHz. |
