A Comparative Simulation of Wireless Power Transfer Antenna Designs on a Paper Substrate

This project focuses on developing and evaluating wireless power transfer (WPT) antennas for wearable devices within the 2.40-2.48 GHz ISM band, aiming to enhance the compactness and efficiency of wearable technology. A significant challenge lies in the lack of well-defined design guidelines and a comprehensive understanding of crucial antenna parameters. Using CST Studio Suite software, single and double circular patch antennas were designed on paper substrates with a dielectric constant of 1.6 and a thickness of 0.18 mm to operate at 2.45 GHz. Key factors affecting frequency include ground plane thickness, substrate properties, patch radius, and feedline dimensions. The results show that the single circular antenna achieved superior impedance matching with a return loss of -34.754 dB, a wider bandwidth of 1.816%, and an optimal VSWR of 1.037. The double circular antenna demonstrated higher gain (9.039 dB) and directivity, making it suitable for applications requiring stronger signal strength. Both antenna configurations exhibited high efficiency, exceeding 90%. The single circular antenna is more suitable for applications requiring excellent impedance matching and minimal signal reflections, while the double circular antenna is ideal for applications demanding stronger signal strength and a wider operating frequency range. This project successfully developed and analyzed circular patch antennas for WPT, achieving the objective of effective power transfer at 2.45 GHz.