Nokia developing technology to charge phones from ambient radio waves?4
Intel's Joshua Smith, who co-developed a temperature and humidity sensor that uses power from a 1.0 megawatt television antenna 4.1 kilometers away, says that to obtain 50 milliwatts of power would require over 1,000 strong signals. Smith's sensor required only 60 microwatts. Another skeptic is Harry Ostaffe, head of mareting for Powercast, who said that, "To get 50 milliwatts seems like a lot".
Nokia's Rouvala says that this technology will probably be ready to be put in a handset in 3 or 4 years. He says that ultimately, the Finnish phone manufacturer plans on using the technology in conjunction with other energy saving faetures such as solar cells placed around the outside body of a handset.
source: Technology Review via EngadgetMobile