RF devices juice batteries from afar
Friday, January 12th, 2007Powercast LLC’s Powercaster and Powerharvester modules can recharge batteries in consumer devices smaller than a cellphone using RF broadcasts from up to a meter away and the company expects Philips Electronics N.V. to be the releasing agent for the products later in 2007.
Using the 900MHz band, the Powercaster module transmists RF energy to a receiver module measuring about half the size of a AAA battery.
In beta testing of a wireless sensor network at the Pittsburgh zoo, the Powerharvester receiver module was retrofitted to the battery compartment of a wireless sensor. The company claims the technology extended battery life from under 120 days to several years; it has been wirelessly charging the sensor batteries to 100 percent since install.

