Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da INATEL |
Texto Completo: | https://tede.inatel.br:8080/tede/handle/tede/225 |
Resumo: | The emergence of new applications that use wireless communication technologies re present a significant development in telecommunications systems. However, the lack of appropriated mechanisms to manipulate the radiation patterns, in order to avoid signal transmission to undesired regions, still constitutes an important drawback. Ex ploiting the Bragg mechanism for reflecting used by photonic structures, we design and developed a quasi-cylindrical reflector with an aperture for improved directivity of readily available centimeter and millimeter wave antennas, i.e., without changing any feature of the antenna. In particular, we used a Bragg structure built by three bilayers, which are made of transparent materials, to analyze the behavior of an electromagnetic field with normal incidence on the surface of each bilayer of this structure. This analy sis verified that the layers thickness according to Bragg law, the structure offers high reflectivity. The aperture has a triangular geometry that resembles the idea of a highly directional horn-like antenna. The design was developed to work at conventional WiFi frequencies based on the IEEE802.11 standards to adjust the signal coverage into the residence. Numerical analyses based in simulations were made using the ANSYS HFSS??software, in terms of reflection coefficient, radiation pattern, directivity and gain. The simulations shown the transparent layers performance together with an an tenna designed for operating frequency at the exact same design frequency, 5,7 GHz. Lastly, the dielectric reflector in almost cylindrical shape was manufactured using 3D printing and experimentally analysed. Comparisons between the results obtained in the numerical and experimental characterization are presented. Remarkably, we observed an improved directionality of the radiation pattern, in excellent agreement with nume rical simulations. Gain enhancements of more than 400% are reported in relation to the antenna gain without the Bragg structure. Significantly, the proposal is an economic and easy-to-build structure, which works with WiFi applications. Therefore, we hope our proposal can be easily implemented by non-specialists, just being placed around the antenna to improve the directivity and gain of the signal. |
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Salazar , Jorge Ricardo Mej??a069.029.071-37http://lattes.cnpq.br/8482888848002303Mej??a , Felipe Beltran235.092.198-05http://lattes.cnpq.br/8371603251897972Salazar , Jorge Ricardo Mej??a069.029.071-37http://lattes.cnpq.br/8482888848002303Souza, Rausley Adriano Amaral de996.751.536-87http://lattes.cnpq.br/6238219709706103Oliveira J??nior , Osvaldo Novais dehttp://lattes.cnpq.br/8582867831317500Brito , Jos?? Marcos C??mara495.450.866-53http://lattes.cnpq.br/0370383210890132041.539.216-02Ribeiro, J??ssica Abranches Pinto2022-02-10T14:57:47Z2021-12-08Ribeiro, J??ssica Abranches Pinto. Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas. 2021. [ 65 ]. disserta????o( Mestrado em Engenharia de Telecomunica????es) - Instituto Nacional de Telecomunica????es, [ Santa Rita do Sapucai] .https://tede.inatel.br:8080/tede/handle/tede/225The emergence of new applications that use wireless communication technologies re present a significant development in telecommunications systems. However, the lack of appropriated mechanisms to manipulate the radiation patterns, in order to avoid signal transmission to undesired regions, still constitutes an important drawback. Ex ploiting the Bragg mechanism for reflecting used by photonic structures, we design and developed a quasi-cylindrical reflector with an aperture for improved directivity of readily available centimeter and millimeter wave antennas, i.e., without changing any feature of the antenna. In particular, we used a Bragg structure built by three bilayers, which are made of transparent materials, to analyze the behavior of an electromagnetic field with normal incidence on the surface of each bilayer of this structure. This analy sis verified that the layers thickness according to Bragg law, the structure offers high reflectivity. The aperture has a triangular geometry that resembles the idea of a highly directional horn-like antenna. The design was developed to work at conventional WiFi frequencies based on the IEEE802.11 standards to adjust the signal coverage into the residence. Numerical analyses based in simulations were made using the ANSYS HFSS??software, in terms of reflection coefficient, radiation pattern, directivity and gain. The simulations shown the transparent layers performance together with an an tenna designed for operating frequency at the exact same design frequency, 5,7 GHz. Lastly, the dielectric reflector in almost cylindrical shape was manufactured using 3D printing and experimentally analysed. Comparisons between the results obtained in the numerical and experimental characterization are presented. Remarkably, we observed an improved directionality of the radiation pattern, in excellent agreement with nume rical simulations. Gain enhancements of more than 400% are reported in relation to the antenna gain without the Bragg structure. Significantly, the proposal is an economic and easy-to-build structure, which works with WiFi applications. Therefore, we hope our proposal can be easily implemented by non-specialists, just being placed around the antenna to improve the directivity and gain of the signal.O surgimento de novas aplica????es que utilizam tecnologias para comunica????o sem fio representa um desenvolvimento expressivo nos sistemas de telecomunica????es. No en- tanto, a falta de mecanismos apropriados para manipular os diagramas de irradia????o, a fim de evitar sinais transmitidos para regi??es indesejadas, ainda constitui uma desvan- tagem importante. Explorando o mecanismo de reflex??o de Bragg empregado em es- truturas fot??nicas, projetamos e desenvolvemos um refletor quase cil??ndrico com uma abertura para melhorar a diretividade de antenas de ondas milim??tricas e centim??tricas prontamente dispon??veis, ou seja, sem alterar qualquer caracter??stica no projeto da antena. Em particular, usamos uma estrutura de Bragg constru??da por tr??s bicamadas, as quais s??o feitas de materiais transparentes, para analisar o comportamento de um campo eletromagn??tico que atravessa a estrutura incidindo normalmente na superf??cie de cada bicamada. Esta an??lise verificou o dimensionamento das camadas condicio- nado a lei de Bragg para a estrutura oferecer alta refletividade. A abertura tem uma geometria triangular que se assemelha a id??ia de uma antena corneta altamente di- retiva. O projeto foi desenvolvido para operar em frequ??ncias WiFi convencionais baseadas nos padr??es IEEE802.11 com o objetivo de ajustar a cobertura do sinal para o interior da resid??ncia. An??lises num??ricas baseadas em simula????o foram realiza- das utilizando o software ANSYS HFSS??, em termos de coeficiente de reflex??o, dia- grama de irradia????o, diretividade e ganho. As simula????es mostraram o desempenho das camadas transparentes em conjunto com uma antena projetada para opera????o na mesma frequ??ncia do projeto, f =5,7 GHz. Por fim, o refletor diel??trico em formato quase cil??ndrico foi fabricado por meio de impress??o em 3D e analisado experimental- mente. S??o apresentadas compara????es entre os resultados obtidos nas caracteriza????es num??rica e experimental. Notavelmente, observa-se a diretividade do diagrama de irradia????o, em excelente concord??ncia com as simula????es num??ricas. Reportam-se aumentos de ganho de mais de 400% em rela????o ao ganho da antena sem a estrutura de Bragg. Como resultado significante, ressaltamos que a proposta desenvolvida para aplica????es WiFi e uma estrutura econ??mica e f??cil de construir. Portanto,?? esperado que possa ser facilmente implementada por n??o especialistas, bastando ser colocada ao redor da antena para aumentar a diretividade e o ganho do sinal.Submitted by Tede Dspace (tede@inatel.br) on 2022-02-10T14:56:59Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Disserta????o V.Final J??ssica Abranches Pinto Ribeiro.pdf: 10110415 bytes, checksum: 171fc24cfbb5b8256ff203940ea03748 (MD5)Made available in DSpace on 2022-02-10T14:57:47Z (GMT). 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dc.title.por.fl_str_mv |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas |
title |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas |
spellingShingle |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas Ribeiro, J??ssica Abranches Pinto Antena; diretividade; diagrama de irradia????o; ganho; impress??o 3D; refletor de Bragg; WiFi 3D printing; antenna; bragg reflector; directivity; gain; radiation pattern; Wifi Engenharia - Telecomunica????es |
title_short |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas |
title_full |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas |
title_fullStr |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas |
title_full_unstemmed |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas |
title_sort |
Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas |
author |
Ribeiro, J??ssica Abranches Pinto |
author_facet |
Ribeiro, J??ssica Abranches Pinto |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Salazar , Jorge Ricardo Mej??a |
dc.contributor.advisor1ID.fl_str_mv |
069.029.071-37 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/8482888848002303 |
dc.contributor.advisor-co1.fl_str_mv |
Mej??a , Felipe Beltran |
dc.contributor.advisor-co1ID.fl_str_mv |
235.092.198-05 |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/8371603251897972 |
dc.contributor.referee1.fl_str_mv |
Salazar , Jorge Ricardo Mej??a |
dc.contributor.referee1ID.fl_str_mv |
069.029.071-37 |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/8482888848002303 |
dc.contributor.referee2.fl_str_mv |
Souza, Rausley Adriano Amaral de |
dc.contributor.referee2ID.fl_str_mv |
996.751.536-87 |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/6238219709706103 |
dc.contributor.referee3.fl_str_mv |
Oliveira J??nior , Osvaldo Novais de |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/8582867831317500 |
dc.contributor.referee4.fl_str_mv |
Brito , Jos?? Marcos C??mara |
dc.contributor.referee4ID.fl_str_mv |
495.450.866-53 |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/0370383210890132 |
dc.contributor.authorID.fl_str_mv |
041.539.216-02 |
dc.contributor.author.fl_str_mv |
Ribeiro, J??ssica Abranches Pinto |
contributor_str_mv |
Salazar , Jorge Ricardo Mej??a Mej??a , Felipe Beltran Salazar , Jorge Ricardo Mej??a Souza, Rausley Adriano Amaral de Oliveira J??nior , Osvaldo Novais de Brito , Jos?? Marcos C??mara |
dc.subject.por.fl_str_mv |
Antena; diretividade; diagrama de irradia????o; ganho; impress??o 3D; refletor de Bragg; WiFi |
topic |
Antena; diretividade; diagrama de irradia????o; ganho; impress??o 3D; refletor de Bragg; WiFi 3D printing; antenna; bragg reflector; directivity; gain; radiation pattern; Wifi Engenharia - Telecomunica????es |
dc.subject.eng.fl_str_mv |
3D printing; antenna; bragg reflector; directivity; gain; radiation pattern; Wifi |
dc.subject.cnpq.fl_str_mv |
Engenharia - Telecomunica????es |
description |
The emergence of new applications that use wireless communication technologies re present a significant development in telecommunications systems. However, the lack of appropriated mechanisms to manipulate the radiation patterns, in order to avoid signal transmission to undesired regions, still constitutes an important drawback. Ex ploiting the Bragg mechanism for reflecting used by photonic structures, we design and developed a quasi-cylindrical reflector with an aperture for improved directivity of readily available centimeter and millimeter wave antennas, i.e., without changing any feature of the antenna. In particular, we used a Bragg structure built by three bilayers, which are made of transparent materials, to analyze the behavior of an electromagnetic field with normal incidence on the surface of each bilayer of this structure. This analy sis verified that the layers thickness according to Bragg law, the structure offers high reflectivity. The aperture has a triangular geometry that resembles the idea of a highly directional horn-like antenna. The design was developed to work at conventional WiFi frequencies based on the IEEE802.11 standards to adjust the signal coverage into the residence. Numerical analyses based in simulations were made using the ANSYS HFSS??software, in terms of reflection coefficient, radiation pattern, directivity and gain. The simulations shown the transparent layers performance together with an an tenna designed for operating frequency at the exact same design frequency, 5,7 GHz. Lastly, the dielectric reflector in almost cylindrical shape was manufactured using 3D printing and experimentally analysed. Comparisons between the results obtained in the numerical and experimental characterization are presented. Remarkably, we observed an improved directionality of the radiation pattern, in excellent agreement with nume rical simulations. Gain enhancements of more than 400% are reported in relation to the antenna gain without the Bragg structure. Significantly, the proposal is an economic and easy-to-build structure, which works with WiFi applications. Therefore, we hope our proposal can be easily implemented by non-specialists, just being placed around the antenna to improve the directivity and gain of the signal. |
publishDate |
2021 |
dc.date.issued.fl_str_mv |
2021-12-08 |
dc.date.accessioned.fl_str_mv |
2022-02-10T14:57:47Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
Ribeiro, J??ssica Abranches Pinto. Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas. 2021. [ 65 ]. disserta????o( Mestrado em Engenharia de Telecomunica????es) - Instituto Nacional de Telecomunica????es, [ Santa Rita do Sapucai] . |
dc.identifier.uri.fl_str_mv |
https://tede.inatel.br:8080/tede/handle/tede/225 |
identifier_str_mv |
Ribeiro, J??ssica Abranches Pinto. Refletor de bragg impresso em 3D para aumentar o ganho e a diretividade de antenas de ondas centim??tricas e milim??tricas. 2021. [ 65 ]. disserta????o( Mestrado em Engenharia de Telecomunica????es) - Instituto Nacional de Telecomunica????es, [ Santa Rita do Sapucai] . |
url |
https://tede.inatel.br:8080/tede/handle/tede/225 |
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por |
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Instituto Nacional de Telecomunica????es |
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Mestrado em Engenharia de Telecomunica????es |
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INATEL |
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Brasil |
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Instituto Nacional de Telecomunica????es |
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Instituto Nacional de Telecomunica????es |
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