Improvement of a ubiquitous power source

Ubiquitous power source can wirelessly transmit power anywhere in a space. In order to realize this system, we have examined an efficient power transmission system which sends power to necessary places only based on direction of arrival measurement. A simple in-phase transmission array is proposed and evaluated as useful and efficient. This system can send power to multiple receivers. In order to send the power to only necessary points, a pilot signal is sent from a receiver. A low power system is manufactured and evaluated.