Abstract:

The electromagnetic shielding effectiveness of a series of stainless fabrics are tested by the Flange coaxial method(30 MHz～1.5 GHz) and the shielding chamber method(1～18 GHz,18~26.5 GHz). Under the two different testing methods, the distribution of the electric field component and the magnetic field component on the sample surface is obviously difference. The shielding chamber method could reflect the directivity of the anisotropy fabrics and the Flange coaxial method could not. Because the electromagnetic wave length is longer in the Flange coaxial method, the same metal fiber distance and the aperture of the same size would affect the electromagnetic shielding effectiveness tested with the Flange coaxial less than with the shielding chamber method. Only the electromagnetic shielding fabrics, with the same metal arrangement spacing in the warp and weft yarn, with macro isotropic electric properties, would follow the same regularity tested with two kinds of test methods, and also is the economic and effective optimum structure form to the unknown direction electromagnetic waves.

Key words: flange coaxial method, shielding chamber method, shielding effectiveness, anisotropy