Sources: Applied Physics Letters [PDF], Duke University [press release]
quote: At roughly 17 dBm of input power, a 5 volt output DC open circuit voltage was obtained. That's enough to drive many electronic devices.
quote: But wait, you say, didn't Tesla transmit wireless power over miles, not feet? Indeed, but here recent technology is breaking through barriers installed by years of disappointments. This new research is showing that power transfer via microwaves and radio waves is not only possible -- but can be extremely efficient if properly tuned.
quote: In other words if you can develop a wave-guide for 12.5 kHz signals and point it in the direction of the U.S. Navy's radio tower, by my calculations (correct me if I'm wrong), you could get enough signal strength to produce a 10+ volt charging open circuit voltage, based on the team's findings... sort of.
quote: I'm not claiming he wasn't brilliant, just that he was also a con-man. He milked fortunes on projects that didn't work, made claims that he couldn't back up, and made excuses for it all.
quote: Tesla was a con-man