The science guys at the Pratt School of Engineering, Duke University say they have made a material that can harvest microwave signals in the air and convert them to electricity.
The material is called “metamaterial”, which is an artificially built material not found naturally in nature, and as at the time of this research, it can harvest 36.8% of the power in a 900MHz signal. The method can be used to generate electricity from Wi-Fi networks/satellite signals, a paper in the journal Applied Physics Letters states.
"Until now, a lot of work with metamaterials has been theoretical. We are showing that with a little work, these materials can be useful for consumer applications," Alexander Katko, a graduate student says.