Investigation of conductive fabric on wearable application (collaboration with Motorola Solutions Malaysia Sdn. Bhd.)
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Date
2016-06
Authors
Loh Yan Pin
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Abstract
Five types of conductive fabric have been studied and investigated for wearable application and wireless charging coil. From the polyester substrate, different coating of metals will give different electrical properties, for example sheet resistivity and volume resistivity. In this research, by varying the parameter, effect of temperature (-30°C and 90°C), humidity (65 °C/95 %RH and 85 °C/95 %RH) and mechanical forces (tension and bending) on the resistivity of the conductive fabrics have been studied. The results show that temperature, humidity and tension force will change the resistivity of the conductive fabrics. The dielectric test indicates that some conductive fabrics can undergo polarization and some undergo macroscopic induction. By using original copper foil design in Motorola Solutions, wireless charging coil made from conductive fabrics are fabricated. Each of the conductive fabrics undergo S-parameter test to investigate the power gain and efficiency compared to the reference original copper coil. Nickel/Copper Ripstop Fabric give the highest power gain and efficiency due to their lowest resistivity compared to other fabrics.