Design and Simulation of Time Reversal Antennas for Wireless Power Transmission of IoT

The traditional microwave power transmission system is mostly point-to-point static target power transmission, while the microwave wireless power transmission system based on time reversal has good space-time focusing characteristics, which can be used for the development of microwave wireless power transmission to moving targets and multi-target wireless power transmission. However, limited transmission efficiency and large size limit its usage scenarios. Aiming at the application requirements of wireless power transmission in the field of consumer Internet of things, this paper designs a set of wireless power transmission system with high focusing effect in multipath environment. The size of the control circuit is greatly reduced by using RF chip and micro assembly process to replace the NC phase shifter and amplification module required for the original time reversal. On this basis, the design of microstrip array transmitting antenna is completed, and the single target time reversal power transfer simulation is carried out in free space and multipath environment. Compared with the single target power transfer simulation results of traditional phased focusing array based on geometric optics method, it is verified that the microwave wireless power transfer system based on time reversal has better focusing effect in multipath environment.