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"Prototype Nokia phone recharges without wires"

Discussion in 'Electronic Design' started by John Doe, Jun 17, 2009.

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  1. John Doe

    John Doe Guest

    The idea is straightforward. Do you think the energy specification
    "5 milliwatts" is correct? Is the prediction of "50 milliwatts"
    reasonable? Mainly curious, Thanks.

    "...a cell phone that recharges itself using a unique system: It
    harvests 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... 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..."
  2. Tim Williams

    Tim Williams Guest

    I wonder what bands they're pulling that from. AM BCB, in the vicinity of
    1490kHz around here, puts out that kind of power density, but that's not
    something you can recieve in a cell phone form factor.

  3. Phil Allison

    Phil Allison Guest

    "John Doe"

    ** Looks like an April Fool's joke to me.

    No science, no testable facts and not from the horse' mouth - ie Nokia.

    It a load of bunk.

    ..... Phil
  4. nospam

    nospam Guest

    5mW is probably an over estimate like most of these things.

    Gathered 24/7 5mW is enough to make a cup of tea once every 217 days -
    utterly pointless.

    10 times as much is still pointless and will not recover the energy used to
    manufacture the harvesting system.

  5. Tim Williams

    Tim Williams Guest

    Wait, what? No shit the cell phone takes more energy to manufacture, that's
    completely beside the point. What, did you think this was supposed to power
    your home?

  6. Rich Webb

    Rich Webb Guest

    I wonder why they're aiming at freqs that are so high and not trying to
    soak up the ambient from the mains? That would seem to be a source with
    a lot higher power density, most of the time and for most users. What's
    on the scope when I grab a bare probe tip isn't in the GHz range.
  7. nospam

    nospam Guest

    I said the harvesting system will never recover the energy used to
    manufacture the harvesting system alone never mind the whole phone.

    I think the technology is aimed at technically illiterate eco tossers who
    think buying a phone with an energy harvesting system is somehow saving the

    Selling into the market of technically illiterate eco tossers by
    dishonestly portraying the phone as 'green' is the only justification for
    development of the technology (for mobile phone use).

    If the justification is supposed to be increased time between charges then
    why isn't there a market for phones with larger batteries? Why don't they
    use the cost and space of the harvesting system for more battery instead
    which has the advantage of increasing talk time also.

    The only reasonable application for ambient energy harvesting is in ultra
    low power systems where battery replacement or charging is difficult and/or
  8. TheM

    TheM Guest

    Would it not be way more effective to put a tiny solar cell on a phone?
    It recovers RF of "slightly" higher frequency, probably produces more
    power as well.

  9. Tim Williams

    Tim Williams Guest

    So? They're not powering the factory with the things, they're powering the
    cell phones with the things. How can that be at all relevant?
    Yup. I wouldn't mind having a cell phone I didn't have to hook on the
    charger every so often. They should investigate acceleration and
    thermoelectric methods too, like some of those "forever-wound" wristwatches.

  10. Phil Allison

    Phil Allison Guest

    "Tim Williams"
    ** Try learing to read - dickhead.

    ** Shame you have no idea what the point being made is.

    ** Fuckwit, totally irrelevnt question.

    ...... Phil
  11. Phil Allison

    Phil Allison Guest

    "Tim Williams"

    ** Means than from an energy conservation perspective - it is bette the
    system was never made.


    ** Massive straw man fallacy.


    ...... Phil
  12. Good idea - coat one side of the phone with PV and provide a clip to a
    belt or pocket to keep it seeing light when carrying. Maybe a problem
    with muggers though.

    Dirk - Transcendence UK - A UK political party - Our podcasts on weird stuff
  13. John Doe

    John Doe Guest

    You need to be taught some manners, troll

  14. Phil Allison

    Phil Allison Guest

    "John Dope"

    ** ROTFLMAO !!!!

    YOU are the FUCKING TROLL - arsehole !!!

    Wasting people's time with ASININE postings.

    PISS OFF - you brainless, ignorant twat.

    ..... Phil
  15. nospam

    nospam Guest

    Samsung just announced a phone with a solar panel covering the whole of
    the back. They claim (optimistically no doubt) 5 to 10 minutes talk time
    per hour of solar charging.

    It might actually be useful to those in the few places in the world with
    lots of sun, not much electricity and cell phone coverage. It will mostly
    be sold to tossers to be worn like a green arm band (while using their

  16. Because this idea is simpler and will work
    Area of surface = 50 cm^2
    Max sunlight intensity 0.1W/cm^2
    Total incoming on surface = 5W
    Efficiency = 20%, energy harvested = 1W

    Which is more than enough to keep the phone charged at a moderate call
    rate in sunny climes, even when insolation is a fraction of that assumed.

    Dirk - Transcendence UK - A UK political party - Our podcasts on weird stuff
  17. TheM

    TheM Guest

    Certainly way way ahead of 5mW, and simpler, too.

    Idea of RF (non-light) harvesting for mobile phone is just plain idiotic.

  18. nospam

    nospam Guest

    What's on the scope is pick up from a man sized antenna with respect to
    ground. A phone doesn't have space for a man sized antenna or any ground to
    work against.
  19. Rich Grise

    Rich Grise Guest

    Yeah - everybody knows they poke holes in the biosphere. ;-P

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