Abstract:

This work is a continuation of our investigations into nonwoven structures designed as barriers against electromagnetic radiation. The needled nonwovens were manufactured from polypropylene fibres. On the basis of the measured electric resistance of the fibres and the properties of the nonwovens manufactured from these fibres, we forecasted the behaviour of the nonwoven products in electromagnetic fields. The results obtained were verified experimentally by testing the nonwoven elements in a microwave electromagnetic field. In order to reduce the microwave transmission through the tested products, electroconductive elements of special shape were introduced into the nonwoven structure. The geometry, properties, and spatial configuration of these elements were selected according to the results obtained during our previous investigations into the attenuation of electromagnetic radiation within the range of 7.0 – 10.0 GHz.