A rectenna is a circuit containing an antenna and a diode, which turns electromagnetic waves into direct current electricity.
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A microwave beam could be used to send power to a rectenna, for " microwave electric propulsion ".
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In 1964 William C . Brown demonstrated a miniature helicopter equipped with a combination antenna and rectifier device called a rectenna.
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Powered by a rectenna, it could fly at 13 miles ( 21 km ) altitude and stay aloft for months.
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The NASA rectenna was made of a thin plastic film, with dipole antennas and receiving circuits embedded in its surface.
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A commonly proposed approach to ensuring fail-safe beam targeting is to use a retrodirective phased array antenna / rectenna.
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As of 2012, only a few optical rectenna devices have been built, demonstrating only that energy conversion is possible.
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Baratunde Cola, a professor at Georgia Institute of Technology, led the team that developed this optical rectenna using carbon nanotubes.
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The rectenna on the aircraft was embedded in the wings and tail surfaces, eliminating the need for the separate antenna body.
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The most apparent advantage optical rectennas have over semiconductor photovoltaics is that rectenna arrays can be designed to absorb any frequency of light.
