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Enhancing RF-to-DC conversion efficiency of wideband RF energy harvesters using multi-tone optimization technique

Published online by Cambridge University Press:  03 December 2014

Véronique Kuhn*
Affiliation:
Lab-STICC, Telecom-Bretagne, Technopôle Brest Iroise CS831818 29238 Brest Cedex 3, Brittany, France. Phone: + 33 (0) 2 29 00 13 41
Fabrice Seguin
Affiliation:
Lab-STICC, Telecom-Bretagne, Technopôle Brest Iroise CS831818 29238 Brest Cedex 3, Brittany, France. Phone: + 33 (0) 2 29 00 13 41
Cyril Lahuec
Affiliation:
Lab-STICC, Telecom-Bretagne, Technopôle Brest Iroise CS831818 29238 Brest Cedex 3, Brittany, France. Phone: + 33 (0) 2 29 00 13 41
Christian Person
Affiliation:
Lab-STICC, Telecom-Bretagne, Technopôle Brest Iroise CS831818 29238 Brest Cedex 3, Brittany, France. Phone: + 33 (0) 2 29 00 13 41
*
Corresponding author: V. Kuhn Email: veronique.kuhn@telecom-bretagne.eu

Abstract

In this paper, a 1.8–2.6 GHz wideband rectenna is designed for radio frequency (RF) energy harvesting in the context of wireless sensor nodes (WSN). To assess the feasibility of ambient RF energy harvesting, the power density from RF base stations is analyzed through statistical measurements. Power density measurements are also performed close to Wi-Fi routers. Using these results, a methodology based on impedance matching network adaptation and maximum power transfer is proposed to design the wideband RF harvester. Using this method, three RF bands, i.e. GSM1800, UMTS and WLAN, are covered. The theoretical analysis is confirmed by simulations and measurements. From measurements results, the prototype RF-to-DC conversion efficiency is 15% at −20 dBm from 1.8 to 2.6 GHz. It is shown that with three RF sources in the chosen bands, each emitting at 10 dBm, the RF-to-DC conversion efficiency is 15% better compared to that measured with a single RF source. Finally, 7 µW is harvested at 50 m from a GSM1800 and UMTS base station. This value confirms the RF harvester workability to supply small sensors.

Type
Research Paper
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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References

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