A Textile-Based Wireless Power Transfer System Made of Slot Yagi-Uda Antennas for Wearable and Sensor Applications

This paper proposes a low-profile and sustainable novel misalignment-resilient wireless power transfer, harvesting, and sensing system (WPT-HSS) to operate at 433 MHz. The resonators used in the WPT-HSS were slot Yagi-Udas that exhibited an average wireless power transfer efficiency of 80% when the transmitting and receiving slot Yagi-Udas were misaligned considering three degrees of freedom with misalignment distances of up to 24 cm between their exciters. The low-profile characteristic, high efficiency, and resilience to misalignment make the proposed WPT-HSS appealing to IoT/IoMT applications. To the author's knowledge, this is the first time a misalignment-resilient wireless power transfer system using slot Yagi-Udas has been proposed. This design can be a stepping stone for future sustainable IoT/IoMT designs.