Electromagnetic wave attenuation in hemp-PAN fibre blends

Electromagnetic wave transmission through free standing meshes of hemp and polyacrylonitrile (PAN) fibre blends was studied. The transmission coeffici ent was found to decrease, both with the rise in hemp content and humidity of the blends. The increase in frequency in the measured range of 15-300 GH z enhances wave attenuation as well, Attenuation is higher for the electric field orientation of the electromagnetic wave parallel to the fibres, as c ompared to the perpendicular orientation. Hemprich fibre materials are thus confirmed to protect against electromagnetic radiation.