Un nuevo sistema prototipo para carga de celulares, es capaz de alimentarse eléctricamente de las ondas de radio del ambiente -que permanentemente nos rodean. La energía recolectada es pequeña, pero suficiente para alimentar de energía un móvil en modo standby indefinidamente (sin necesidad de conectarse a las líneas eléctricas), de acuerdo a Markku Rouvala, uno de los investigadores que desarrolló el dispositivo en el Nokia Research Centre de Cambridge, UK.
This may sound too good to be true but Oyster cards used by London commuters perform a similar trick, powering themselves from radiowaves emitted by the reader devices as they are swiped. And similarly old crystal radio sets and more recently modern radio frequency identification (RFID) tags, increasingly used in shipping and as antitheft devices, are powered purely by radiowaves.
The trick here is to ensure that these circuits use less power than is being received, said Rouvala. So far they have been able to harvest up to 5 milliwatts. Their short-term goal is to get in excess of 20 milliwatts, enough power to keep a phone in standby mode indefinitely without having to recharge it. But this would not be enough to actually use the phone to make or receive a call, he says. So ultimately the hope is to be able to get as much as 50 milliwatts which would be sufficient to slowly recharge the battery.
Fuente:
http://www.guardian.co.uk/environment/2009/jun/10/nokia-mobile-phone