Wireless charging to multiple electronic devices simultaneously in enclosed box

This paper investigates the feasibility of wireless charging to multiple electronic devices in enclosed box. Specifically in our scheme, multiple receivers deployed within a box with conducting walls receive wireless power simultaneously. Simulations and measurements are conducted in a fully-enclosed cubic box with dimensions 1 meter by 1 meter by 1 meter for three scenarios: “1 transmitter and 1 receiver,” “1 transmitter and 2 receivers,” and “1 transmitter and 3 receivers.” In all the three scenarios, high power transmission efficiencies are demonstrated. Particularly in the third scenario, each of the three receivers receives more than 25% of the power from the transmitter around 410 MHz.