Wednesday, November 15, 2006

Physics promises wireless power

The tangle of cables and plugs needed to recharge today's electronic gadgets could soon be a thing of the past.

US researchers have outlined a relatively simple system that could deliver power to devices such as laptop computers or MP3 players without wires.

How Wireless energy could work??

a phenomenon that causes an object to vibrate when energy of a certain frequency is applied.

Instead of using acoustic vibrations, the researcher's exploits the resonance of electromagnetic waves. Electromagnetic
radiation includes radio waves, infrared and X-rays.
Typically, systems that use electromagnetic radiation,
such as radio antennas, are not suitable for the efficient transfer of
energy because they scatter energy in all directions, wasting large
amounts of it into free space.
To overcome this problem, the team investigated a
special class of "non-radiative" objects with so-called "long-lived

Hence, a simple copper antenna designed to have
long-lived resonance could transfer energy to a laptop with its own
antenna resonating at the same frequency. The computer would be truly

However, Mr Hay said that transferring the power was only part of the solution. "There are a number of other aspects that need to be
addressed to ensure efficient conversion of power to a form useful to
input to devices." Professor Soljacic will present the work at the American
Institute of Physics Industrial Physics Forum in San Francisco on 14
November. The work was done in collaboration with his colleagues Aristeidis Karalis and John Joannopoulos.

Source : BBC Technology News
, Splash Power

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