Title :
Wireless power harvesting with planar rectennas for 2.45 GHz RFIDs
Author :
Olgun, Ugur ; Chen, Chi-Chih ; Volakis, John L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
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.
Keywords :
electromagnetic waves; energy harvesting; fractal antennas; iterative methods; light emitting diodes; microstrip antennas; planar antennas; radiofrequency identification; rectennas; rectifiers; voltage multipliers; ISM band; LED; RF-DC conversion efficiency; RFID; electrical energy harvesting; electromagnetic radiation; frequency 2.45 GHz; iteration Koch fractal patch antenna; planar rectenna design; power 4 W; rectenna structure; two stage Dickson charge pump voltage doubler rectifier circuit; wireless power harvesting; Antenna measurements; Radio frequency; Radiofrequency identification; Rectennas; Schottky diodes;
Conference_Titel :
Electromagnetic Theory (EMTS), 2010 URSI International Symposium on
Conference_Location :
Berlin
Print_ISBN :
978-1-4244-5155-5
Electronic_ISBN :
978-1-4244-5154-8
DOI :
10.1109/URSI-EMTS.2010.5637008
