Improvement in Transmission Efficiency for Cavity Resonance Enabled Wireless Power Transfer by Handling Cavity Impedance

We proposed a technique to improve the transmission efficiency by handling the impedance inside the cavity by utilizing a monopole probe (matching probe) terminated by a variable reactance circuit. As a result of measurement, the reflection coefficient of the transmitter side reduced from 0.895 to 0.324 before and after inserting the matching probe. The reflection coefficient of the receiver side reduced from 0.967 to 0.882. The transmission efficiency improved from 0.67 % to 13.09 %. From the above, it was confirmed that transmission efficiency is improved by handling cavity impedance.