Consideration of high efficiency double helical antenna for magnetic-coupled resonant wireless power transfer

Abstract

We considered the structure of the antenna for coupled-resonant wireless power transfer (CR-WPT) for efficient power transfer. Helical antenna and spiral antenna have been proposed as coil antenna for CR-WPT. We focused on helical coil, and proposed a double-helical antenna. Therefore, we simulated coil height, electric power transfer distance, electric power transfer efficiency and position gap to compare helical antenna and double-helical antenna model. As a result, double helical antenna model is found to be predominance than helical coil. In addition, we proposed another approach for high efficiency of antenna. We were examined for change of electric power transfer efficiency that put a conductive plate on the upper and lower sides of double helical coil. As a result, electric power transfer efficiency was improved by put a conductive plate.