Abstract
When discussing textile antenna and its comfortable use, the effect of air permeability and atmospheric moisture are eminent factors which have direct influence on textile antenna transmission characteristics and comfort of the wearer when used practically. The rate of airflow under certain air pressure passing through any surface is termed as air permeability of that surface and amount of moisture regained by a material when exposed to varying environmental humidity ranges compared to dry weight of that material is its moisture regain. Fleece and spacer fabrics were selected each having different air permeability and moisture regain values but both fabrics constitute polyethylene terephthalate - PET. Microstrip patch antennas that resonate at 2.45GHz were constructed utilizing both textile fabrics. Spacer fabric has high air permeability and low moisture regain compared to fleece fabric. Spacer fabric is a knitted 3-dimensional structured fabric whereas fleece is nonwoven in structure. FlecTron® is utilized as the conductive part of the microstrip patch antenna. Antenna made off spacer fabric showed better transmission characteristics and are least altered due to change in humidity compared to antenna made off fleece fabric. In this research, we conclude that the selected textile spacer fabric, with its high air permeability and low moisture regain, is the most favourable textile material in the construction of textile antennas.
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