Wireless power harvesting with planar rectennas for 2.45 GHz RFIDs

Wireless power harvesting with planar rectennas for 2.45 GHz RFIDs Conference

Olgun, U, Chen, CC, Volakis, JL. (2010). Wireless power harvesting with planar rectennas for 2.45 GHz RFIDs . 329-331. 10.1109/URSI-EMTS.2010.5637008

This paper presents a rectenna (rectifier + antenna) design to harvest electrical energy for powering RFIDs from ambient electromagnetic radiation at the 2.45 GHz ISM band (WiFi, Bluetooth, RFID, etc.). The rectenna structure is formed by a miniaturize 2nd iteration Koch fractal patch antenna and two stage Dickson charge pump voltage-doubler rectifier circuit. The proposed rectenna achieves a small size with relatively high realized gain (4 dBi) and good RF to DC conversion efficiency (up to 70%). As a result, the proposed rectenna harvests enough energy from a commercial RFID interrogator 3.1 meters away (4W EIRP at 2.45 GHz ISM band) to power up a 1.6 V LED, enough voltage to enable some RFID chips. © 2010 IEEE.