@shyamcn10: You are right about the DC transmission from satellites however, the rate at which it would charge the phone would be too little for the effect to be noticeable.
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we know that a piezoelectric material can produce a potential difference when subjected to pressure points on 2 opposite surfaces.so suppose that the material is such that it is responsive to microwave radiation in the range of that used by the mobile operator.adjust the length of the piezo material so that its naturalk frequency coincides with the b/w by means of a variable length attenuator.the p.d. b/w opposite faces can be used to charge a small low capacity rechargeable battery or directly fed to the battery being used.
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Dont you think the amount it would charge will be very less? compared to the drainage? Some of my mates in college were talking about this. Creating energy through sound, like a mic, but these systems have been tested, and they provide little power, maybe enough for a PIC microcontroller, but not a mobile phone.
@silverscorpion The only thing at present that at most interests me is a portable 4 AA batery USB charger by Lady Ada. It's a small project/DIY device:
Minty Boost! - USB charger for your gadgets
Very handy at difficult times and the life of this is pretty long for emergency use. Maybe about 1.5 years too. (NOTE that 9V batteries provide same amount of power but for lesser duration then that of 1.5Vx4 (6V) AA batteries.)