RF-Powered Wearable Energy Harvesting and Storage Module Based on E-Textile Coplanar Waveguide Rectenna and Supercapacitor

This paper presents a high-efficiency compact (0.016? 0 2 ) textile-integrated energy harvesting and storage module for RF power transfer. A flexible 50 ?m-thick coplanar waveguide rectenna filament is integrated with spray-coated supercapacitor to realize an “e-textile” supply module. The meandered antenna maintains S xmlns:xlink="http://www.w3.org/1999/xlink">11 <; -6 dB inside outside the fabric in human proximity 2.3 dBi gain. rectifier achieves peak RF-DC efficiency of 80%, across 4.5 k? load, 1.8 V open-circuit voltage from -7 dBm. directly on cotton substrate using carbon aqueous electrolyte. When connected supercapacitor, over octave half-power bandwidth. demonstrated charging 1.5 (8.4 mJ) 4 minutes, at 4.2 m license-free source, demonstrating significant improvement previous rectennas while eliminating management circuitry. has end-to-end 38% transmitter. On-body, rectenna's 4.8%, inclusive in-body losses transient shadowing, mJ 32 seconds 16.6 ?W/cm . It concluded that e-textile are most efficient method powering wearables densities.