New Formula for Conversion Efficiency of RF EH and Its Wireless Applications

Existing works on energy harvesting (EH) wireless systems often assume constant conversion efficiency for the energy harvester. In practice, conversion efficiency often varies with input power. In this paper, based on a review of existing energy harvesters in the literature, a heuristic expression for the conversion efficiency as a function of the input power is derived by curve fitting. Using this function, two example energy harvesters are used to analyze the realistic performances of wireless relaying and wireless energy transfer. Numerical results show that the realistic performances of the wireless systems could be considerably different from the performances predicted by the existing analysis.

[1]  Purushottam Kulkarni,et al.  Energy Harvesting Sensor Nodes: Survey and Implications , 2011, IEEE Communications Surveys & Tutorials.

[2]  Luca Larcher,et al.  A 868MHz CMOS RF-DC power converter with −17dBm input power sensitivity and efficiency higher than 40% over 14dB input power range , 2012, 2012 Proceedings of the ESSCIRC (ESSCIRC).

[3]  S. Scorcioni,et al.  A Reconfigurable Differential CMOS RF Energy Scavenger With 60% Peak Efficiency and -21 dBm Sensitivity , 2013, IEEE Microwave and Wireless Components Letters.

[4]  Prusayon Nintanavongsa,et al.  Design Optimization and Implementation for RF Energy Harvesting Circuits , 2012, IEEE Journal on Emerging and Selected Topics in Circuits and Systems.

[5]  S. Scorcioni,et al.  Optimized CMOS RF-DC converters for remote wireless powering of RFID applications , 2012, 2012 IEEE International Conference on RFID (RFID).

[6]  K. Mayaram,et al.  Efficient Far-Field Radio Frequency Energy Harvesting for Passively Powered Sensor Networks , 2008, IEEE Journal of Solid-State Circuits.

[7]  Hyungsik Ju,et al.  Throughput Maximization in Wireless Powered Communication Networks , 2013, IEEE Trans. Wirel. Commun..

[8]  K. Kotani,et al.  High-Efficiency Differential-Drive CMOS Rectifier for UHF RFIDs , 2009, IEEE Journal of Solid-State Circuits.

[9]  Zhu Han,et al.  Wireless Networks With RF Energy Harvesting: A Contemporary Survey , 2014, IEEE Communications Surveys & Tutorials.

[10]  K. Kotani,et al.  High efficiency CMOS rectifier circuit with self-Vth-cancellation and power regulation functions for UHF RFIDs , 2007, 2007 IEEE Asian Solid-State Circuits Conference.

[11]  I. S. Gradshteyn,et al.  Table of Integrals, Series, and Products , 1976 .

[12]  Mohsen Guizani,et al.  5G wireless backhaul networks: challenges and research advances , 2014, IEEE Network.

[13]  Yong-xin Guo,et al.  A Dual-Band Rectenna Using Broadband Yagi Antenna Array for Ambient RF Power Harvesting , 2013, IEEE Antennas and Wireless Propagation Letters.

[14]  Dusan M. Milosevic,et al.  An RF-to-DC energy harvester for co-integration in a low-power 2.4 GHz transceiver frontend , 2012, 2012 IEEE International Symposium on Circuits and Systems.

[15]  Ali A. Nasir,et al.  Relaying Protocols for Wireless Energy Harvesting and Information Processing , 2012, IEEE Transactions on Wireless Communications.

[16]  Bruno R. Franciscatto,et al.  High-efficiency rectifier circuit at 2.45 GHz for low-input-power RF energy harvesting , 2013, 2013 European Microwave Conference.

[17]  Wouter A. Serdijn,et al.  Co-Design of a CMOS Rectifier and Small Loop Antenna for Highly Sensitive RF Energy Harvesters , 2014, IEEE Journal of Solid-State Circuits.

[18]  Fan Zhang,et al.  A 9.2µA gen 2 compatible UHF RFID sensing tag with −12dBm Sensitivity and 1.25µVrms input-referred noise floor , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).

[19]  K. Philips,et al.  A self-calibrating RF energy harvester generating 1V at −26.3 dBm , 2013, 2013 Symposium on VLSI Circuits.

[20]  Cheng-Xiang Wang,et al.  Spatial Spectrum and Energy Efficiency of Random Cellular Networks , 2015, IEEE Transactions on Communications.