RF energy harvesting system for charging mobile phones

Abstract

As mobile phone consumers demand mobility and convenience in charging/recharging the batteries, there is a need to consider new recharging methods from the conventional method. This paper examines the levels of energy that can be harnessed from the atmosphere and achieve power sufficient to charge a mobile phone. This is achieved by collecting the ambient frequency signals in the air using an antenna and sending the collected signal to a voltage multiplier circuit that converts it into a DC signal. The DC signal is then stored in a super-capacitor and used to charge a mobile phone. Unlike previous works, we proposed using a voltage doubler and battery storage for a steady system. The proposed system shows a significant efficiency in harness RF energy for mobile phone charging.