In this lecture, we discuss the origins of retrodirectivity, starting with the Van Atta array and its use as radar chaff. We then demonstrate how to use these systems in communications links. Part of the Shenzhen lecture series on wireless without batteries.
Paper: C.R. Valenta, B. Marshall, M.S. Trotter, G.A. Koo, G.D. Durgin “Staggered Pattern Charge Collection and Retrodirective Active Phase Modulation: Two New Passive Sensing Technologies.” IEEE RFID Conference, Orlando, FL. April 2012.