THE EFFECTS OF WEAVE AND CONDUCTIVE YARN DENSITY ON THE ELECTROMAGNETIC SHIELDING EFFECTIVENESS OF CELLULAR WOVEN FABRICS

In this study, the electromagnetic shielding effectiveness of twill and some cellular woven conductive fabrics woven with stainless steel core yarns at different weft densities has been measured by free space measurement technique at horizontal polarization of the antenna. It is observed that woven fabric samples, which have been positioned so that the weft yarns have been parallel to the antenna polarization, have shown good electromagnetic shielding performances in high frequency band, namely industrial, scientific and medical band. And also, when the steel core weft yarn density has been increased, the decrease in the electromagnetic shielding effectiveness of fabric samples, which have been positioned the same way, is observed. Conversely, the electromagnetic shielding effectiveness of fabric samples, which have been positioned so that the weft yarns have been vertical to the antenna polarization, has increased in agreement with the effective surface conductivity.