Quote:
Originally Posted by dcb
A typical high power AM station putts out 50000 watts, or 67 horsepower, that is radiating out in three dimensions. The power available to a given sized antenna (say car sized) is a rapidly decreasing fraction of that as you get farther from the transmitter.
If I figure it right (no promises) a saturn sw2 sized rectangle could at most see 1%. or 0.7 hp at 17 feet from the antenna! It gets worse at an accelerating rate the farther you get.
I mean the inefficiencies are obvious, right? We aren't seriously considering wireless en-mass for powering vehicles, for convenience, are we?
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It doesn't quite work that way with resonant circuits.
Nikola Tesla Page, Tesla's power receiver
You'll need superconductors (very high Q) to get useful amounts of power, but if that is solved, then it's possible to build a car that can charge from radio waves.
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