retrodirective antenna

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Retrodirectivity — A retrodirective antenna is an antenna that transmits the signal back in the same direction it came from. This is based on the principle of self phase conjugation of the input signal. Directivity depends on relative phases of signal radiated from … Wikipedia
Solar power satellite — A solar power satellite, or SPS or Powersat, as originally proposed would be a satellite built in high Earth orbit that uses microwave power transmission to beam solar power to a very large antenna on Earth. Advantages of placing the solar… … Wikipedia
Space-based solar power — Left: Part of the solar energy is lost on its way through the atmosphere by the effects of reflection and absorption. Right: Space based solar power systems convert sunlight to microwaves outside the atmosphere, avoiding these losses, and the… … Wikipedia

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