Researchers Not Giving Up On Dream Of Wireless Power

from the but-I'm-not-the-only-one dept

At some point or another, everybody's fantasized about it: wouldn't it be great if an electronic device could be powered wirelessly, fully eliminating the need for cables? It's an idea that's been talked about for a long time, back to the work of Nikola Tesla. Now a new team of researchers at MIT is going after the problem again. They believe that there's solid physics backing the idea up, and in fact their research builds on Tesla's original work. Still, this is firmly at the theoretical stages. Consider how long it's taking for fuel cell powered mobile devices to take off. We can safely say that this will take a much, much longer, if it ever comes about.

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  1. identicon
    PhysicsGuy, 15 Nov 2006 @ 5:51pm

    Re: EM "friction"

    Did you not read the link either, this is why they're using resonance...

    ---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 resonances".

    When energy is applied to these objects it remains bound to them, rather than escaping to space. "Tails" of energy, which can be many metres long, flicker over the surface.

    "If you bring another resonant object with the same frequency close enough to these tails then it turns out that the energy can tunnel from one object to another," said Professor Soljacic.

    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 wireless.

    Any energy not diverted into a gadget or appliance is simply reabsorbed. ---

    again, if you want details then e-mail the guy... i am sure that outside this little discussion nobody is "a Principal Research Scientist in the Research Laboratory of Electronics at MIT" and has conducted experiments on the subject in hand yet within this little discussion we all seem to be experts as to why this won't work and are sure it will cause cancer even though we don't understand what it is or the principles as to why it works... go us.

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