A technology capable of harvesting energy by gathering ambient radio frequency waves and converting them into electricity to charge a low power device has been revealed in London. The device was presented in a theatre at the Royal Institution where the signals from mobile phones used by attendees was converted to power a loudspeaker in the hall. This technology uses a rectified and multi-band antenna capable of absorbing energy from radio frequency bands.
Even though the project is still in early development, it demonstrated the potential of harvesting radio frequencies as a power source. The main issue here is whether enough energy can be captured to be useful and whether the volatility of available energy can be adequately controlled. This concept is still in its infancy, and we look forward to seeing how this technology develops.