Dual-band Wireless Power Transfer System for Simultaneous Wireless Information and Power Transfer System

This paper proposes a novel dual-band simultaneous wireless information and power transfer configuration which employs a single transmitter/receiver system for both magnetic coupling and microwave transmission. The proposed configuration consists of a 2.4 GHz loop antenna stacked with a 73 MHz spiral coil. The loop antenna works as the primary coil of the spiral coil at 73MHz. At 2.4GHz, the spiral coil operates as the reflector for the loop antenna. The simulation results of the proposed dual-band configuration achieve 94% and 68% power transfer efficiencies at 2.4GHz and 73MHz at 2mm transfer distance, respectively. The proposed model also achieved wide-band operations at both frequency bands; 7MHz at the low band and 340MHz at the high band. The proposed dual-band system will enable high-level wireless transmissions of both power and information.