Study on a harmonic-based retrodirective system for microwave power transfer

摘要

Recently, wireless power transfer (WPT) techniques has attracted much attention. Microwave power transfer, one of the type of WPT, has some feature that is able to transfer with a long distance. Some applications such as a small airplane or smartphonehave been proposed and developed. A Retrodirective system can be used for beam steering in a microwave power transfer system. The target sends a pilot signal, and microwaves are radiated from the direction of arrival (DOA). In this paper, we proposed aharmonics-based retrodirective system (HBRS). Reradiation harmonics from rectennas are adopted for the pilot signal in the HBRS. As such, it is not necessary to prepare the pilot signal source. In this paper, we constructed an HBRS which is consist froma rectenna, a DOA estimating system, and a transmitting system.