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Rectennas are diodes attached to antennas. With current technology they can convert EM waves with frequency up to \approx 1 THz to electricity.
Imagine an isolated room at 300^{o} K containing a black object and a rectenna. By Planck law, the black object radiates about 450W/m^{2}, of which about 1/10,000 is of frequency less than 1 THz. Couldn't this .045W/m^{2} be captured from the waste heat, in contradiction with the 2nd law of thermodynamics? For e.g. use this electricity to heat another room and create a temperature differential
Imagine an isolated room at 300^{o} K containing a black object and a rectenna. By Planck law, the black object radiates about 450W/m^{2}, of which about 1/10,000 is of frequency less than 1 THz. Couldn't this .045W/m^{2} be captured from the waste heat, in contradiction with the 2nd law of thermodynamics? For e.g. use this electricity to heat another room and create a temperature differential