Optimization of RF-DC converters

Detalhes bibliográficos
Autor(a) principal: Ribeiro, Helena Luísa Silva
Data de Publicação: 2021
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/33883
Resumo: This thesis presents, firstly, an analysis on the impacts of the diode's configuration in an RF-DC converter and how the frequency affects the converter. The two possible configurations for the diode are in shunt or series, there were designed two converters with these configurations, in which the experimental results obtained 49% efficiency at 0dBm in the series configuration and 41 % at 0 dBm in the shunt converter. Even though the series con- figuration has a better performance, it requires a choke block, in this way, the shunt converter is the most appealing diode configuration. As for the frequency analysis, it could be concluded that when the frequency increases the diode has more difficulty rectifying the RF signal, so its performance decreases. Secondly, the impacts on the impedance seen by the diode were also analysed through a source pull simulation, which concluded that the diode requires a high impedance from the source. To provide more evidence to the source pull simulation, two different RF-DC converters were compared, the first one used the results from the source pull to design the converter, the second one used the traditional complex conjugate method. Even though the efficiencies obtained from the experimental results were not as high as possible, they were very satisfactory. With the high impedance converter achieving 33 % efficiency and the complex conjugate converter only 3 %, with this, it is possible to conclude that the source pull method with high impedance improves significantly the diode's performance.
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spelling Optimization of RF-DC convertersWPTRectennaRectifierDiodeRF-DC converterHigh impedanceLoad pullSource pullRadiative WPTHarmonic rejectionThis thesis presents, firstly, an analysis on the impacts of the diode's configuration in an RF-DC converter and how the frequency affects the converter. The two possible configurations for the diode are in shunt or series, there were designed two converters with these configurations, in which the experimental results obtained 49% efficiency at 0dBm in the series configuration and 41 % at 0 dBm in the shunt converter. Even though the series con- figuration has a better performance, it requires a choke block, in this way, the shunt converter is the most appealing diode configuration. As for the frequency analysis, it could be concluded that when the frequency increases the diode has more difficulty rectifying the RF signal, so its performance decreases. Secondly, the impacts on the impedance seen by the diode were also analysed through a source pull simulation, which concluded that the diode requires a high impedance from the source. To provide more evidence to the source pull simulation, two different RF-DC converters were compared, the first one used the results from the source pull to design the converter, the second one used the traditional complex conjugate method. Even though the efficiencies obtained from the experimental results were not as high as possible, they were very satisfactory. With the high impedance converter achieving 33 % efficiency and the complex conjugate converter only 3 %, with this, it is possible to conclude that the source pull method with high impedance improves significantly the diode's performance.Esta tese apresenta, primeiramente, uma análise dos impactos que a con- figuração do díodo pode ter num conversor RF-DC e adicionalmente uma análise de como a escolha da frequência pode afetar o conversor. Sendo as duas possíveis configurações do díodo em paralelo ou em serie, foram projetados dois conversores em que foi possível obter os resultados experimentais de 49 % eficiência a 0 dBm na configuração em serie e 41 % a 0 dBm na configuração paralelo. Apesar da configuração serie apresentar uma melhor performance, esta requer o uso de um choke, deste modo a configuração paralelo é a mais apelativa. No caso da análise em frequência foi possível concluir que quando se usam frequências mais elevadas, o díodo tem mais dificuldade em retificar o sinal RF, fazendo a performance do díodo diminuir. Adicionalmente, os impactos da impedância vista pelo díodo na fonte, também foram analisados por uma simulação source pull, em que foi possível concluir que o díodo requer altas impedâncias na fonte. Para obter mais evidencias de que os resultados do source pull estão corretos, foram comparados dois conversores RF-DC, em que o primeiro usa os resultados do source pull para projetar o circuito e o segundo conversor usa o método tradicional do complexo conjugado. Apesar das eficiências resultantes das medidas experimentais não serem muito elevadas, os resultados experimentais foram bastante satisfatórios. Com o conversor de alta impedância a obter 33% de eficiência e o conversor em complexo conjugado apenas 3%, o que leva a concluir que o método das altas impedâncias melhora a performance do díodo.2022-05-16T10:31:45Z2021-12-10T00:00:00Z2021-12-10info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/33883engRibeiro, Helena Luísa Silvainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-05-06T04:37:34Zoai:ria.ua.pt:10773/33883Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-05-06T04:37:34Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Optimization of RF-DC converters
title Optimization of RF-DC converters
spellingShingle Optimization of RF-DC converters
Ribeiro, Helena Luísa Silva
WPT
Rectenna
Rectifier
Diode
RF-DC converter
High impedance
Load pull
Source pull
Radiative WPT
Harmonic rejection
title_short Optimization of RF-DC converters
title_full Optimization of RF-DC converters
title_fullStr Optimization of RF-DC converters
title_full_unstemmed Optimization of RF-DC converters
title_sort Optimization of RF-DC converters
author Ribeiro, Helena Luísa Silva
author_facet Ribeiro, Helena Luísa Silva
author_role author
dc.contributor.author.fl_str_mv Ribeiro, Helena Luísa Silva
dc.subject.por.fl_str_mv WPT
Rectenna
Rectifier
Diode
RF-DC converter
High impedance
Load pull
Source pull
Radiative WPT
Harmonic rejection
topic WPT
Rectenna
Rectifier
Diode
RF-DC converter
High impedance
Load pull
Source pull
Radiative WPT
Harmonic rejection
description This thesis presents, firstly, an analysis on the impacts of the diode's configuration in an RF-DC converter and how the frequency affects the converter. The two possible configurations for the diode are in shunt or series, there were designed two converters with these configurations, in which the experimental results obtained 49% efficiency at 0dBm in the series configuration and 41 % at 0 dBm in the shunt converter. Even though the series con- figuration has a better performance, it requires a choke block, in this way, the shunt converter is the most appealing diode configuration. As for the frequency analysis, it could be concluded that when the frequency increases the diode has more difficulty rectifying the RF signal, so its performance decreases. Secondly, the impacts on the impedance seen by the diode were also analysed through a source pull simulation, which concluded that the diode requires a high impedance from the source. To provide more evidence to the source pull simulation, two different RF-DC converters were compared, the first one used the results from the source pull to design the converter, the second one used the traditional complex conjugate method. Even though the efficiencies obtained from the experimental results were not as high as possible, they were very satisfactory. With the high impedance converter achieving 33 % efficiency and the complex conjugate converter only 3 %, with this, it is possible to conclude that the source pull method with high impedance improves significantly the diode's performance.
publishDate 2021
dc.date.none.fl_str_mv 2021-12-10T00:00:00Z
2021-12-10
2022-05-16T10:31:45Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10773/33883
url http://hdl.handle.net/10773/33883
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv mluisa.alvim@gmail.com
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