Study of metallic modification on the surface of synthetic fibre with high shielding effectiveness

From the point of view of the theories of electromagnetic wave transmission, electrochemistry and modification, a metallic modification technique possessed of not only low cost but also endowing flexible materials composed of synthetic fibre with high shielding effectiveness is put forward. Morphologies and element analysis of the modified samples, which are coated with copper film or copper and nickel-iron duplex film, are carried out by SEM and EDX The shielding effectiveness of the samples is tested within the incident electromagnetic wave frequency range of 0.1 MHz/spl sim/1000 MHz and 1.5 GHz/spl sim/18 GHz. Two kinds of nickel-plating methods are compared. The SE of the best sample is between -93 dB and -110 dB within the frequency range from 0.1 MHz to 1000 MHz. The value is up to the first grade of shielding. The SE value of the modified samples reduces while the incident frequency rises from 1.5 GHz to 18 GHz. The SE value of the sample with nickel-iron outer layer is better than that of the sample with single nickel outer layer.