Experimental Evaluation on RSSI-based Phase Optimization in Microwave Power Transfer

In this paper, we present an experimental evaluation of the several phase optimization algorithms for distributed cooperative microwave power transfer. The proposed evaluation uses multiple Tx antennas distributed in a space. When the Tx antennas are in the far field from each other, appropriate phase control can generate constructive interference at the target location. The phase optimization algorithm optimizes the phase of each Tx antenna based on the received-signal-strength indication (RSSI) feedback from the target. The experimental results indicate that the RSSI measurement resolution and the controllable phase resolution at each Tx antenna affect the performance of the phase optimization.