Remote powering and battery charging using radio waves
Wireless power transfer (WPT) is available for inductively charging cell phones, covering a distance in the millimeter range. It is desirable to increase this distance up to ten meters. For that we need radiative WPT. Due to transmit power restrictions we can practically realize an average DC power at that distance of a few tens of microwatts. Although this can be used for powering ultra-low-power sensors, this is not enough for practical cell phone battery charging. Our current research is focused on creating bubbles of high energy density for battery charging without violating transmit power restrictions. Theoretical and practical results for radiative WPT will be demonstrated.