Design of radio frequency harvesting system for wireless communications

Energy harvesting (EH) is a technique of collecting energy from ambient radio frequency (RF) sources to operate small sensors and devices without batteries. Harvesting energy from the environment is an alternative and cost-effective approach because it reduces the dependency on battery-operated syst...

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Bibliographic Details
Main Author:	Roy, Sunanda
Format:	Thesis
Published:	2022
Subjects:	TK2896-2985 Production of electricity by direct energy conversion
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id	my-mmu-ep.12077
record_format	uketd_dc
spelling	my-mmu-ep.120772024-02-07T07:24:36Z Design of radio frequency harvesting system for wireless communications 2022-11 Roy, Sunanda TK2896-2985 Production of electricity by direct energy conversion Energy harvesting (EH) is a technique of collecting energy from ambient radio frequency (RF) sources to operate small sensors and devices without batteries. Harvesting energy from the environment is an alternative and cost-effective approach because it reduces the dependency on battery-operated systems significantly. However, the performance and potential of an EH system depend on the design strategy and sensitivity. Therefore, significant research is still ongoing in this area to meet the increasing demand for wireless applications. In this research, the goal is to harvest ambient RF energy and convert it into direct current (DC) electrical energy in an ambient environment. This objective leads to developing the concept, feasibility analysis, design, and implementation where the energy is harvested efficiently from available RF sources. An RF spectral survey in various locations was performed inside the area of the Multimedia University of Cyberjaya, Malaysia within the frequency spectrum of 0.5–3.0 GHz. The approach of harvesting RF energy over multiple frequency bands was investigated to improve the sensitivity and enhance the DC output power. In this research, a quad-band RF harvester was proposed, where good impedance matching and antenna efficiency were obtained, which maximized RF energy harvesting. A maximum power point tracking system or a boost converter was introduced, which controls the scanning of available frequency bands, optimizes the rectenna performance, and ensures that energy is harvested at maximum efficiency. Additionally, the proposed design provides a maximum DC rectification efficiency of 70.02% with an RF input of -20 dBm and more than 40% fractional bandwidth. The rectifier that was designed to implement this system could produce 464.5 mV by harvesting RF energy simultaneously, according to practical measurements. Moreover, this research deals with an overview of the ultra-wideband hybrid (RF and solar) EH technique, design, and implementation of the prototype. The prototype of the hybrid harvester demonstrated that with 360 lux ambient light intensity, the solar cell could generate 122.5 mV energy while the harvester could attain an extra 5–48% energy with ambient RF input level variation from -10 to -20 dBm. Different factors, such as various frequency spacings, low RF input energy levels, and incoherent phase arrangements, were addressed in frequency domain analysis and measurements. 2022-11 Thesis http://shdl.mmu.edu.my/12077/ http://erep.mmu.edu.my/ phd doctoral Multimedia University Faculty of Engineering (FOE)
institution	Multimedia University
collection	MMU Institutional Repository
topic	TK2896-2985 Production of electricity by direct energy conversion
spellingShingle	TK2896-2985 Production of electricity by direct energy conversion Roy, Sunanda Design of radio frequency harvesting system for wireless communications
description	Energy harvesting (EH) is a technique of collecting energy from ambient radio frequency (RF) sources to operate small sensors and devices without batteries. Harvesting energy from the environment is an alternative and cost-effective approach because it reduces the dependency on battery-operated systems significantly. However, the performance and potential of an EH system depend on the design strategy and sensitivity. Therefore, significant research is still ongoing in this area to meet the increasing demand for wireless applications. In this research, the goal is to harvest ambient RF energy and convert it into direct current (DC) electrical energy in an ambient environment. This objective leads to developing the concept, feasibility analysis, design, and implementation where the energy is harvested efficiently from available RF sources. An RF spectral survey in various locations was performed inside the area of the Multimedia University of Cyberjaya, Malaysia within the frequency spectrum of 0.5–3.0 GHz. The approach of harvesting RF energy over multiple frequency bands was investigated to improve the sensitivity and enhance the DC output power. In this research, a quad-band RF harvester was proposed, where good impedance matching and antenna efficiency were obtained, which maximized RF energy harvesting. A maximum power point tracking system or a boost converter was introduced, which controls the scanning of available frequency bands, optimizes the rectenna performance, and ensures that energy is harvested at maximum efficiency. Additionally, the proposed design provides a maximum DC rectification efficiency of 70.02% with an RF input of -20 dBm and more than 40% fractional bandwidth. The rectifier that was designed to implement this system could produce 464.5 mV by harvesting RF energy simultaneously, according to practical measurements. Moreover, this research deals with an overview of the ultra-wideband hybrid (RF and solar) EH technique, design, and implementation of the prototype. The prototype of the hybrid harvester demonstrated that with 360 lux ambient light intensity, the solar cell could generate 122.5 mV energy while the harvester could attain an extra 5–48% energy with ambient RF input level variation from -10 to -20 dBm. Different factors, such as various frequency spacings, low RF input energy levels, and incoherent phase arrangements, were addressed in frequency domain analysis and measurements.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Roy, Sunanda
author_facet	Roy, Sunanda
author_sort	Roy, Sunanda
title	Design of radio frequency harvesting system for wireless communications
title_short	Design of radio frequency harvesting system for wireless communications
title_full	Design of radio frequency harvesting system for wireless communications
title_fullStr	Design of radio frequency harvesting system for wireless communications
title_full_unstemmed	Design of radio frequency harvesting system for wireless communications
title_sort	design of radio frequency harvesting system for wireless communications
granting_institution	Multimedia University
granting_department	Faculty of Engineering (FOE)
publishDate	2022
_version_	1794019134789386240

Design of radio frequency harvesting system for wireless communications

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