Strategy for Microwave Energy Harvesting From Ambient Field or a Feeding Source

• Published in: IEEE transactions on power electronics Vol. 27; no. 11; pp. 4481 - 4491
• Main Authors: Marian, V., Allard, B., Vollaire, C., Verdier, J.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-11-2012; The Institute of Electrical and Electronics Engineers, Inc. (IEEE); Institute of Electrical and Electronics Engineers
• Subjects: Circuits; Contactless energy supply; Electric power; Electromagnetics; Energy exchange; energy harvesting; Energy transfer; Engineering Sciences; Harvesting; Heat transfer; Integration; Microwaves; Noise levels; Power supply; Radio frequencies; Receiving antennas; rectenna; Rectennas; Schottky diodes; Strategy; switch; Wireless sensor networks
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2012.2185249

Wireless energy transfer has been demonstrated using microwave electromagnetic support. Significant efficiencies are reported in the case of large dimension systems. Lots of embedded systems require a small power supply but with a large degree of integration where standard contactless energy transfer techniques suffer from poor efficiency. In such systems, RF input energy is rectified using rectenna circuits. The latter circuits are optimized for a given input RF power and cannot accommodate the two possible ways of energy transfer: the dedicated transfer (high power) or the harvesting of ambient energy (low power). This paper presents a novel rectenna architecture tunable for 900 MHz-2.45 GHz operation, able to process RF input power in the -30 to +30 dBm (dB miliwatt) range with a peak efficiency of 80%.