Metasurface collectors for ambient RF energy harvesting applications

Metasurface is a planar type of metamaterial that is preferred in all electromagnetic applications due to its simplicity. Metasurfaces can be constructed using an array of electrically small resonators. This work investigates the feasibility of using small, highly efficient metasurface structures...

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Main Author:	Ahmed Ghaleb Amer, Abdulrahman
Format:	Thesis
Language:	English English English
Published:	2022
Subjects:	TD Environmental technology Sanitary engineering
Online Access:	http://eprints.uthm.edu.my/8377/1/24p%20ABDULRAHMAN%20AHMED%20GHALEB%20AMER.pdf http://eprints.uthm.edu.my/8377/2/ABDULRAHMAN%20AHMED%20GHALEB%20AMER%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8377/3/ABDULRAHMAN%20AHMED%20GHALEB%20AMER%20WATERMARK.pdf
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spelling	my-uthm-ep.83772023-02-23T06:28:15Z Metasurface collectors for ambient RF energy harvesting applications 2022-07 Ahmed Ghaleb Amer, Abdulrahman TD Environmental technology. Sanitary engineering Metasurface is a planar type of metamaterial that is preferred in all electromagnetic applications due to its simplicity. Metasurfaces can be constructed using an array of electrically small resonators. This work investigates the feasibility of using small, highly efficient metasurface structures as RF collectors for energy harvesting applications. The first part of this work discussed a new metasurface split-ring resonator (SRR) absorber as an energy harvester. An array of 7x7 SRR metasurface resonators were designed and fabricated to maximise energy absorption at broadband frequencies of 1.88 GHz to 6.4 GHz. An air layer is placed between the dielectric substrate and the ground plane to enhance the absorption bandwidth. In addition, four resistor loads placed on the splits of the top metallic layer of the resonator are used to achieve a polarization-insensitive, wide-angle from 0o up to 60o , higher absorption, and higher harvesting efficiency. The near-unity absorption of over 90% and the harvesting efficiency of around 88% are achieved over a wider frequency range. Therefore, an efficient miniaturized wideband metasurface energy harvester is introduced in the second part of this work. A design of the electromagnetic metasurface harvester inspired by an array of printed metallic electric ring resonators (ERR) is presented. A finite array of 5x5 ERR unit cells is analysed numerically and experimentally at 5 GHz band. The array is analysed for maximising radiation to AC conversion efficiency where a resistor terminates each resonator through a metallic via. The overall radiation to AC harvesting efficiency of about 91% and 78% was obtained numerically at normal incidence and different oblique incidence angles up to 60o , respectively. Unlike earlier metasurface harvesters that connected each resonator to a load, this novel design uses a feed network to connect all resonators to one load to increase the efficiency. The novel proposed metasurface is based on the doubleelliptical cylinder resonator that can capture energy at 5 GHz band. The simulation results yielded radiation to AC efficiency of 94% at normal incidence. A finite array of 4x4 unit cells was fabricated and tested experimentally for verification. 2022-07 Thesis http://eprints.uthm.edu.my/8377/ http://eprints.uthm.edu.my/8377/1/24p%20ABDULRAHMAN%20AHMED%20GHALEB%20AMER.pdf text en public http://eprints.uthm.edu.my/8377/2/ABDULRAHMAN%20AHMED%20GHALEB%20AMER%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/8377/3/ABDULRAHMAN%20AHMED%20GHALEB%20AMER%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TD Environmental technology Sanitary engineering
spellingShingle	TD Environmental technology Sanitary engineering Ahmed Ghaleb Amer, Abdulrahman Metasurface collectors for ambient RF energy harvesting applications
description	Metasurface is a planar type of metamaterial that is preferred in all electromagnetic applications due to its simplicity. Metasurfaces can be constructed using an array of electrically small resonators. This work investigates the feasibility of using small, highly efficient metasurface structures as RF collectors for energy harvesting applications. The first part of this work discussed a new metasurface split-ring resonator (SRR) absorber as an energy harvester. An array of 7x7 SRR metasurface resonators were designed and fabricated to maximise energy absorption at broadband frequencies of 1.88 GHz to 6.4 GHz. An air layer is placed between the dielectric substrate and the ground plane to enhance the absorption bandwidth. In addition, four resistor loads placed on the splits of the top metallic layer of the resonator are used to achieve a polarization-insensitive, wide-angle from 0o up to 60o , higher absorption, and higher harvesting efficiency. The near-unity absorption of over 90% and the harvesting efficiency of around 88% are achieved over a wider frequency range. Therefore, an efficient miniaturized wideband metasurface energy harvester is introduced in the second part of this work. A design of the electromagnetic metasurface harvester inspired by an array of printed metallic electric ring resonators (ERR) is presented. A finite array of 5x5 ERR unit cells is analysed numerically and experimentally at 5 GHz band. The array is analysed for maximising radiation to AC conversion efficiency where a resistor terminates each resonator through a metallic via. The overall radiation to AC harvesting efficiency of about 91% and 78% was obtained numerically at normal incidence and different oblique incidence angles up to 60o , respectively. Unlike earlier metasurface harvesters that connected each resonator to a load, this novel design uses a feed network to connect all resonators to one load to increase the efficiency. The novel proposed metasurface is based on the doubleelliptical cylinder resonator that can capture energy at 5 GHz band. The simulation results yielded radiation to AC efficiency of 94% at normal incidence. A finite array of 4x4 unit cells was fabricated and tested experimentally for verification.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ahmed Ghaleb Amer, Abdulrahman
author_facet	Ahmed Ghaleb Amer, Abdulrahman
author_sort	Ahmed Ghaleb Amer, Abdulrahman
title	Metasurface collectors for ambient RF energy harvesting applications
title_short	Metasurface collectors for ambient RF energy harvesting applications
title_full	Metasurface collectors for ambient RF energy harvesting applications
title_fullStr	Metasurface collectors for ambient RF energy harvesting applications
title_full_unstemmed	Metasurface collectors for ambient RF energy harvesting applications
title_sort	metasurface collectors for ambient rf energy harvesting applications
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2022
url	http://eprints.uthm.edu.my/8377/1/24p%20ABDULRAHMAN%20AHMED%20GHALEB%20AMER.pdf http://eprints.uthm.edu.my/8377/2/ABDULRAHMAN%20AHMED%20GHALEB%20AMER%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8377/3/ABDULRAHMAN%20AHMED%20GHALEB%20AMER%20WATERMARK.pdf
_version_	1776103331433807872

Metasurface collectors for ambient RF energy harvesting applications

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