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This experimental finding provides encouragement for the use of rectennas as bidirectional (both transmitting and receiving) devices in developmental microwave wireless-power-transmission systems. Heretofore, a bidirectional microwave terminal for a typical conceptual wireless-power-transmission system might have included (a) a transmitter comprising a transmitting antenna connected to a magnetron or klystron oscillator or perhaps an impact avalanche transit-time- (IMPATT)-diode oscillator, plus (b) a receiver comprising a separate rectenna. If only one device — a rectenna capable of operating in transmitting as well as receiving mode — could be used at each end of a microwave power link, then the cost of the link could be reduced. Potential applications for inverse rectennas lie in the microwave wireless transmission of power between any two of the following: ground stations, airships, aircraft, and spacecraft.
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