Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
Energy Harvesting for Mobile Computing Joe Paradiso Responsive ...
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Ambient RF<br />
• Power density ~ E2 /Z0 – (Field strength) 2 over 377 Ohms<br />
– Would like to see fields of 10 V/m at antenna<br />
• 26 μW/cm2 Flashing Antenna Top<br />
– Not seen in typical urban environments<br />
• Except close to cell phone transmitters<br />
• AM Crystal radios yield under 1 mW (typically 20 μW) w. large<br />
antenna and good ground.<br />
Need large collection area and/or need to be very close to transmitter<br />
Mickle et al (US Patent 6,856,291) - U. Pittsburgh - highly resonant regenerative<br />
antenna with an effective cross section that is much larger than its geometric area<br />
(perhaps by a factor of 1000 or more)
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