Metamaterial Impedance Matching Network for Ambient RF-Energy Harvesting Operating at 2.4 GHz and 5 GHz

Ertugrul Coskuner,Joan J Garcia-Garcia

doi:10.3390/electronics10101196

Ertugrul Coskuner, Joan J Garcia-Garcia

Open Access

https://doi.org/10.3390/electronics10101196

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Journal: Electronics	Publication Date: May 17, 2021
Citations: 9	License type: CC BY 4.0

Affiliation: Autonomous University of Barcelona

Abstract

This paper points out the viability of the utilization of metamaterial transmission lines as a multifrequency impedance matching network, improving RF-Energy Harvesting systems operating around 2.4 GHz and 5 GHz. Metamaterial transmission lines introduce additional degrees of freedom in the transmission line design, providing the possibility to match the impedance in multiple bands. The impedance matching structure has been designed and optimized using ADS simulator to match the input impedance of a four-diode-bridge rectifier connected to an energy management system. The proposed Metamaterial Impedance Matching Network (MIMN) has been fabricated using standard PCB technologies and tested in a full operative ambient RF-Energy Harvesting System obtaining a DC output voltage of 1.8 V in a 6.8 mF supercapacitor.

Highlights

Operating at 2.4 GHz and 5 GHz.RF-Energy Harvesting (RF-EH) systems have been a recurrent topic for the last decade [1,2,3,4,5,6]
Some authors have proposed the elimination of the lumped LC impedance matching networks in low power RF-EH, arguing that losses introduced by the network in these conditions may be comparable with the matching benefits [47,48]
Ever, the possibility of matching multiple frequencies using the Metamaterial Impedance Matching Network (MIMN) constitutes an inThe metamaterial transmission line is based on coupled λ/2 microstrip resonators, being teresting result to explore in further designs

Summary

Introduction

Operating at 2.4 GHz and 5 GHz. RF-Energy Harvesting (RF-EH) systems have been a recurrent topic for the last decade [1,2,3,4,5,6]. The possibility of wireless feeding field sensors [7,8], RF-ID tags, or IoTs devices is closer every day [9,10,11], due to the tendency to reduce the power of each computational operation [10], and due to the proliferation of the wasted ambient. From the point of view of the amount of collected energy, it is evident that a multiple frequency or broadband approach is the most convenient strategy, in order to take maximum advantage of the available ambient RF energy [14,19,20]. Examples of single [2], dual [14,21,22], multiple [12,13,15,23], and broadband frequency

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