Abstract:

The fine structure of yarns and fabrics in the electromagnetic shielding fabrics are analyzed. The effective shielding grid structure made of twisted metal fiber yarns is extracted. The corresponding equivalent circuit and general factors are put forward. The SE in 1~18GHz of three kinds of samples made of bare copper and metal fiber yarns and fabrics are researched using shielded chamber method. It shows that grid structure reflects the effective shielding structure of this kind of fabric. The period spacing of metallic yarn is the key influencing factors to the SE of the fabric.The SE of the fabrics with metal fbier in one way has significant direction. It is difficult to determine the influence of conductive probability of metal fiber yarn in the junctions and still needs further research. These research results are suitable for electromagnetic shielding fabric, and effective parameters are extracted to quantitative numerical calculating for the shielding effectiveness.

Key words: electromagnetic shielding fabric, shielding effectiveness, grid structure, general factor