Radio wave exists everywhere in the form of signals transmitted from TV, Radio, Wireless LAN, Mobile phone etc. A technology of capturing and storing the energy from the radio wave sources is Energy Harvesting. RF energy is harvested by capturing radiated energy at the desired frequency and converted into DC voltage in usable form. The range at which the energy radiated from wireless sources is around(10-100) Mw but the receivers utilizes only a small amount of energy, rest is dissipated as heat or absorbed by other materials. Electricity can be generated from the wasted energy that has been harvested. An experimental RF energy harvesting system from Wi-Fi hotspots 2.4 GHz is to be presented.
Keywords—Schottky Diodes, Dickson Charge Pump, E-Shaped Microstrip Patch Antenna.