Radio Frequency Rectennas
The simplest crystal radio receiver, employing an antenna and a demodulating diode (rectifier), is actually a rectenna - although it discards the DC component before sending the signal to the earphones. People living near strong radio transmitters would occasionally discover that with a long receiving antenna, they could get enough electric power to light a light bulb. Researchers are experimenting the use of rectennae to power sensors in remote areas.
RF rectennas are used for several forms of wireless energy transfer.
Read more about this topic: Rectenna
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