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Energy from the ether

28.08.2011

By collecting the scattered energy of radio emission, it is possible to supply power to numerous sensors. The ether on our planet is filled with radio emission of various frequencies. This is both a natural background created by fluctuations in the ionosphere or lightning strikes, and the results of human activity - waves of radio, television broadcasting, from cell phones and wireless networks. Apparently, over time, the power of the energy emitted into the ether will only grow.

Scientists and engineers at the Georgia Institute of Technology, led by Professor Manos Tenzeris, have been trying since 2006 to create an antenna that could harvest enough power to power autonomous sensors. At first, they printed the microcircuits of these devices on paper, filling the printer with ink with silver nanoparticles. Such antennas consumed ultrashort television broadcast waves with a frequency of 100-200 MHz and provided energy of a hundred microwatts.

Now the researchers have switched to carbon nanotube plastics and inks; the upper limit of the range has increased to 15 GHz (in the future - up to 60 GHz), and the account of the collected energy went to milliwatts. By accumulating it in a supercapacitor and feeding the sensors from time to time, it is possible to increase their power to tens of milliwatts. This will revolutionize the field of microsensors.

If you can collect scattered energy, then you can equip anything with microsensors. These are structural elements to monitor emerging stresses, the patient - for constant monitoring, the house - to control temperature and humidity, food - to have time to eat it before it deteriorates, airports - to search for explosives, since the radiation level is even higher there due to for all sorts of radars. The sensors will be completely autonomous and very cheap.

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