1. The rectenna converted microwave power into electricity, allowing the helicopter to fly. 2. NASA also invested in the rectenna concept as part of their SPS work. 3. The concept is based on the rectenna which is used in wireless power transmission. 4. A high power array of microwave or laser transmitters would beam power to a rectenna . 5. Nonetheless, optical rectenna research is ongoing. 6. This model was powered by a small gasoline engine and did not support a rectenna . 7. The Earth-based rectenna would likely consist of many short dipole antennas connected via diodes. 8. In current optical rectenna devices, metal-insulator-metal ( MIM ) electron tunneling. 9. A rectenna functions like a specialized radio antenna which is used to convert radio waves into direct current electricity. 10. He then uses a microwave power transmission broadcast via the stratellite's rectenna to compromise and destroy the network. 
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