Techniques for evaluation and minimization of coupling in antenna array systems

Detalhes bibliográficos
Autor(a) principal: Barbosa, Alexandre Braga
Data de Publicação: 2022
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10773/36287
Resumo: The evolution of modern MIMO systems has led them to increasingly operate at frequencies around millimeter waves in the search for greater bandwidth, as well as in the search for greater antenna gains, and beamforming or spatial filtering capabilities. For this, the high density of antennas in a short space alerts to the appearance of undesirable phenomena, such as the mutual coupling between the elements, which degrade the performance of these systems, making it necessary to find techniques to minimize this effect. In this dissertation, this problem was analyzed, and solutions are presented that allow the reduction of this negative effect in antenna aggregates. In this sense, two printed structures were developed, with properties associated with metamaterials, one in the shape of a U and the other with a variation resulting from the joining of two rings. Subsequently, a comparative study was carried out in simulation of the impact of the two structures in different situations (with patch antennas calibrated to 8.4GHz), finally the results obtained by simulation were compared with the measurements obtained in the laboratory for arrays of 4 elements with and without the U-shaped metamaterials, and the effect of these structures on the array was analysed.
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spelling Techniques for evaluation and minimization of coupling in antenna array systems5GSatellite communicationsPhased arraysBeamformingThe evolution of modern MIMO systems has led them to increasingly operate at frequencies around millimeter waves in the search for greater bandwidth, as well as in the search for greater antenna gains, and beamforming or spatial filtering capabilities. For this, the high density of antennas in a short space alerts to the appearance of undesirable phenomena, such as the mutual coupling between the elements, which degrade the performance of these systems, making it necessary to find techniques to minimize this effect. In this dissertation, this problem was analyzed, and solutions are presented that allow the reduction of this negative effect in antenna aggregates. In this sense, two printed structures were developed, with properties associated with metamaterials, one in the shape of a U and the other with a variation resulting from the joining of two rings. Subsequently, a comparative study was carried out in simulation of the impact of the two structures in different situations (with patch antennas calibrated to 8.4GHz), finally the results obtained by simulation were compared with the measurements obtained in the laboratory for arrays of 4 elements with and without the U-shaped metamaterials, and the effect of these structures on the array was analysed.A evolução dos sistemas MIMO modernos tem levado estes a operar cada vez mais em frequências em torno de ondas milimétricas na procura de maiores larguras de banda, assim como na procura por maiores ganhos das antenas, e capacidade de beamforming ou filtragem espacial. Para isso, essa elevada densidade de antenas num curto espaço alerta para o aparecimento de fenómenos indesejáveis, como são o acoplamento mútuo entre os elementos, que degradam a performance destes sistemas, tornando-se necessário encontrar técnicas para minimizar esse efeito. Nesta dissertação esta problemática foi analisada, e são apresentadas soluções que possibilitam a redução deste efeito negativo em agregados de antenas. Nesse sentido, foram desenvolvidas duas estruturas impressas, com propriedades associadas aos metamateriais, propriedades estas que têm ganho bastante relevo nas últimas décadas na melhoria de sistemas MIMO em vários aspetos, uma em forma de U e outra com uma variação resultante da junção de dois anéis. Posteriormente foi feito um estudo comparativo em simulação do impacto das duas estruturas em diferentes situações (estando as antenas patch calibradas para 8.4GHz), sendo finalmente comparados os resultados obtidos por simulação com as medidas obtidas em laboratório para arrays de 4 elementos com e sem os metamateriais em forma de U e analisou-se o efeito destas estruturas no agregado.2023-02-10T14:09:09Z2022-12-07T00:00:00Z2022-12-07info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10773/36287engBarbosa, Alexandre Bragainfo: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:RCAAP2024-02-22T12:09:37Zoai:ria.ua.pt:10773/36287Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:07:00.624145Repositório 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 Techniques for evaluation and minimization of coupling in antenna array systems
title Techniques for evaluation and minimization of coupling in antenna array systems
spellingShingle Techniques for evaluation and minimization of coupling in antenna array systems
Barbosa, Alexandre Braga
5G
Satellite communications
Phased arrays
Beamforming
title_short Techniques for evaluation and minimization of coupling in antenna array systems
title_full Techniques for evaluation and minimization of coupling in antenna array systems
title_fullStr Techniques for evaluation and minimization of coupling in antenna array systems
title_full_unstemmed Techniques for evaluation and minimization of coupling in antenna array systems
title_sort Techniques for evaluation and minimization of coupling in antenna array systems
author Barbosa, Alexandre Braga
author_facet Barbosa, Alexandre Braga
author_role author
dc.contributor.author.fl_str_mv Barbosa, Alexandre Braga
dc.subject.por.fl_str_mv 5G
Satellite communications
Phased arrays
Beamforming
topic 5G
Satellite communications
Phased arrays
Beamforming
description The evolution of modern MIMO systems has led them to increasingly operate at frequencies around millimeter waves in the search for greater bandwidth, as well as in the search for greater antenna gains, and beamforming or spatial filtering capabilities. For this, the high density of antennas in a short space alerts to the appearance of undesirable phenomena, such as the mutual coupling between the elements, which degrade the performance of these systems, making it necessary to find techniques to minimize this effect. In this dissertation, this problem was analyzed, and solutions are presented that allow the reduction of this negative effect in antenna aggregates. In this sense, two printed structures were developed, with properties associated with metamaterials, one in the shape of a U and the other with a variation resulting from the joining of two rings. Subsequently, a comparative study was carried out in simulation of the impact of the two structures in different situations (with patch antennas calibrated to 8.4GHz), finally the results obtained by simulation were compared with the measurements obtained in the laboratory for arrays of 4 elements with and without the U-shaped metamaterials, and the effect of these structures on the array was analysed.
publishDate 2022
dc.date.none.fl_str_mv 2022-12-07T00:00:00Z
2022-12-07
2023-02-10T14:09:09Z
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/10773/36287
url http://hdl.handle.net/10773/36287
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
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