NEW CELL PHONE THAT RECHARGES ITSELF WITH RADIO WAVES

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NEW CELL PHONE THAT RECHARGES ITSELF WITH RADIO WAVES

 user 2009-06-19 at 1:57:07 pm Views: 51
  • #22258

    http://tech.yahoo.com/blogs/null/143945
    Nokia builds cell phone that recharges itself with radio waves
    Prototype Nokia phone recharges without wires
    Pardon
    the cliche, but it’s one of the holiest of Holy Grails of technology:
    Wireless power. And while early lab experiments have been able to
    “beam” electricity a few feet to power a light bulb, the day when our
    laptops and cell phones can charge without having to plug them in to a
    wall socket still seems decades in the future.

    Nokia, however,
    has taken another baby step in that direction with the invention of a
    cell phone that recharges itself using a unique system: It harvest
    ambient radio waves from the air, and turns that energy into usable
    power. Enough, at least, to keep a cell phone from running out of juice.

    While
    “traditional” (if there is such a thing) wireless power systems are
    specifically designed with a transmitter and receiver in mind, Nokia’s
    system isn’t finicky about where it gets its wireless waves. TV, radio,
    other mobile phone systems — all of this stuff just bounces around the
    air and most of it is wasted, absorbed into the environment or
    scattered into the ether. Nokia picks up all the bits and pieces of
    these waves and uses the collected electromagnetic energy to create
    electrical current, then uses that to recharge the phone’s battery. A
    huge range of frequencies can be utilized by the system (there’s no
    other way, really, as the energy in any given wave is infinitesimal).
    It’s the same idea that Tesla was exploring 100 years ago, just on a
    tiny scale.

    Mind you, harvesting ambient electromagnetic energy
    is never going to offer enough electricity to power your whole house or
    office, but it just might be enough to keep a cell phone alive and
    kicking. Currently Nokia is able to harvest all of 5 milliwatts from
    the air; the goal is to increase that to 20 milliwatts in the short
    term and 50 milliwatts down the line. That wouldn’t be enough to keep
    the phone alive during an active call, but would be enough to slowly
    recharge the cell phone battery while it’s in standby mode,
    theoretically offering infinite power — provided you’re not stuck deep
    underground where radio waves can’t penetrate.Nokia says it hopes to
    commercialize the technology in three to five years.