Did you ever dream you could dump your batteries and pull electricity from the air? Electrical engineering researcher Paul Theilmann is working on power-scavenging "freegan" sensors to collect unused radio frequency energy from the air and use it instead of batteries.
His first foray is into environments where batteries are hard to replace and directed, radio-frequency energy is difficult to deliver. Cell phone towers and radio transmitters emit plenty of unused energy but collecting it is tricky. Theilmann's work enables his sensors to run on weaker, wireless signals. One of his innovations is a rectifier that converts wireless energy to direct current (DC).
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