Design of a high performance rectenna for wireless powering 2.45Ghz RFIDs

This paper describes the design and the optimization of a rectenna in ISM band, dedicated to wirelessly supplying RFID´s sensors, to replace or recharge existing batteries. The circuit is based on a double voltage rectifier designed and optimized at 2.45GHz with ADS software. We detail a new methodology to design and optimize a rectenna circuit. As a result, excellent performance is achieved in terms of both output voltage level and RF to DC conversion efficiency. The described rectenna reaches approximately a conversion efficiency of 90% and produces 6Volt at 8 dBm enabling hence some RFID chips.