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Date: 17 June 2018
Wireless transmission of electricity over long distances

Wireless transmission of electricity over long distances :: 09 January, 2002

Category: Energy & Power | Type: New technology

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At a recent conference, Intel has demonstrated a system capable of sending electric power to remote, depending on the same principle as battery chargers wirelessly. But with a range of several kilometers ...

Intel continues for several years of research on power transmission distance using radio waves. The theoretical principle is nothing new, but the feasibility and interest remain to be demonstrated. In 2006, researchers at MIT (Aristeidis Karalis and John D. Joannopoulos) showed by numerical simulations, that the power transmission distance should be more effective than what we imagined, and, in particular, should not be too disturbed by the presence of obstacles.

This work gave Alanson Sample (Intel Research Seattle) the idea to dig this issue, which he became the specialist, who took the project Wireless Resonant Energy Link (WREL). In principle, process, magnetic induction, is the transmission of radio waves, the electromagnetic field emitted triggering an electrical current through the receiving antenna.

In August 2008, at the Intel Developer Forum, the young engineer had submitted a device consisting of two antennas comprising a copper wire wound in a spiral plane. Separated from a few tens of centimeters for the demonstration, they used to light a lamp.

Only microwatts

This time, long distance Alanson Sample conducted a demonstration at the Radio and Wireless Symposium which recently closed its doors in San Diego. The power was emitted by a conventional antenna of a television transmitter. A 4.1 km away, it could be recovered by an antenna of about twenty centimeters in thirty form electricity. The received power was 60 microwatts (history does not say what power was issued) at a voltage of 0.7 volts.

Alanson Sample believes that it is possible for this distance to reach the theoretical maximum power of 200 microwatts, given by the equation Telecommunications (Friis transmission equation in English). With such a distance, the transmitted power will remain, whatever the future developments, extremely low.

The idea of transmitting a higher energy in a smaller volume, within a room is also, if we dare say, in the air. For shorter distances, too, a group of industrialists (Wireless Power Consortium) is already in place to standardize current processes battery charger wireless running all by induction.

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Latest comments

I know that with time and some more research and knowledge, we shall be able to transmit power wirelessly
Posted by: of Nigeria 06 November, 2009 14:15
Wireless electricity is such an interesting field and such a powerful application of engineering that can revolutionize the entire conventional power system and we as an Electrical Engineers should contribute towards its development of efficiency without any selfish reason because this is our one opportunity to save this planet from being so brutally polluted,and against the global climate change and should fight against all those people who disregarded the work of Nicolas Tesla.
Posted by: of Kathmandu,Nepal 01 October, 2009 16:19
this is very benefical and important topic for all electrical student.thank you for publish these topic.
Posted by: of bbsr 28 August, 2009 10:03

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