论文信息 - Wireless power harvesting with planar rectennas for 2.45 GHz RFIDs

Wireless power harvesting with planar rectennas for 2.45 GHz RFIDs

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.

J. Volakis | Chi-Chih Chen | U. Olgun

[1] Klaus Finkenzeller,et al. RFID Handbook: Radio-Frequency Identification Fundamentals and Applications , 2000 .

[2] Joseph M. Kahn,et al. An autonomous 16 mm/sup 3/ solar-powered node for distributed wireless sensor networks , 2002, Proceedings of IEEE Sensors.

[3] D. Werner,et al. An overview of fractal antenna engineering research , 2003 .

[4] Context-Aware Computing,et al. Inferring Activities from Interactions with Objects , 2004 .

[5] Paul K. Wright,et al. Vibration Powered Battery-Assisted Passive RFID Tag , 2005, EUC Workshops.

[6] Joshua R. Smith,et al. Design of a Passively-Powered, Programmable Sensing Platform for UHF RFID Systems , 2007, 2007 IEEE International Conference on RFID.

[7] Daniel M. Dobkin,et al. The RF in RFID: Passive UHF RFID in Practice , 2007 .

[8] Chi-Chih Chen,et al. Low-profile planar rectenna for batteryless RFID sensors , 2010, 2010 IEEE Antennas and Propagation Society International Symposium.