Design of Compact Coupled Resonators for Triple-Band Wireless Power Transfer

This letter suggests a design methodology for triple-band wireless power transfer (TB-WPT) filters. The proposed triple-bandpass filter (TB-PF) is designed using two complementary split-ring resonators CSRR-DGSs coupled in a back-to-back configuration, and operates at 0.6, 2.4, and 2.7 GHz. Each of the transmitter and the receiver has a size of 25 mm $\times25$ mm. The measured power transfer efficiencies were 96% for 0.6 GHz, 74% at 2.4 GHz, and 70% at 2.7 GHz, respectively, at a separation distance between the transmitter and receiver of 10 mm.