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Previous issue date: 2015-02-06 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Os metamateriais tem atra?do uma grande aten??o nas ultimas d?cadas, em
decorr?ncia de suas propriedades eletromagn?ticas n?o serem encontradas na natureza.
Desde que os metamateriais passaram a ser sintetizados atrav?s da inser??o de inclus?es
artificialmente fabricadas num meio homog?neo especificado, facilitou ao pesquisador
uma larga cole??o de par?metros independentes, como, por exemplo, as propriedades
eletromagn?ticas do material. Foram realizadas investiga??es das propriedades dos
ressoadores em anel e dos metamateriais. Foi apresentado um estudo das principais
teorias que explicam com clareza a supercondutividade. As teorias BCS, Equa??es de
London e modelo dos Dois Fluidos s?o as teorias que d?o suporte a aplica??o dos
supercondutores nas antenas de microfita. Assim, esta Tese de Doutorado apresenta uma
an?lise te?rica, num?rico-computacional e experimental, utilizando o formalismo de onda
completa, atrav?s da aplica??o do m?todo da Linha de Transmiss?o Transversa ? LTT,
aplicado no Dom?nio da Transformada de Fourier (FTD). O LTT ? um m?todo de onda
completa, que tem como regra a obten??o dos campos eletromagn?ticos em termos dos
componentes transversais ? estrutura. A inclus?o do patch supercondutor ? feita
utilizando-se a condi??o de contorno complexa resistiva. S?o obtidos resultados da
freq??ncia de resson?ncia em fun??o dos par?metros da antena. Para valida??o das
an?lises foram elaborados programas computacionais na linguagem Fortran, simula??es
no software comercial, sendo as curvas tra?adas no software comercial e no software
Matlab, al?m de se comparar o patch convencional com o supercondutor e depois se
comparar um substrato metamaterial com um convencional, juntando o substrato com o
patch, verificando o que melhora em ambos os quesitos, demonstrando a utiliza??o
pr?tica destas estruturas em antenas fabricadas em laborat?rio. / Metamaterials have attracted great attention in recent decades, due to their
electromagnetic properties which are not found in nature. Since metamaterials are now
synthesized by the insertion of artificially manufactured inclusions in a specified
homogeneous medium, it became possible for the researcher to work with a wide
collection of independent parameters, for example, the electromagnetic properties of the
material. An investigation of the properties of ring resonators was performed as well as
those of metamaterials. A study of the major theories that clearly explain
superconductivity was presented. The BCS theory, London Equations and the Two-Fluid
Model are theories that support the application of superconducting microstrip antennas.
Therefore, this thesis presents theoretical, numerical and experimental-computational
analysis using full-wave formalism, through the application of the Transverse
Transmission Line ? LTT method applied in the Fourier Transform Domain (FTD). The
LTT is a full wave method, which, as a rule, obtains the electromagnetic fields in terms of
the transverse components of the structure. The inclusion of the superconducting patch is
performed using the complex resistive boundary condition. Results of resonant frequency
as a function of antenna parameters are obtained. To validate the analysis, computer
programs were developed using Fortran, simulations were created using the commercial
software, with curves being drawn using commercial software and MATLAB, in addition
to comparing the conventional patch with the superconductor as well as comparing a
metamaterial substrate with a conventional one, joining the substrate with the patch,
observing what improves on both cas
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19757 |
| Date | 06 February 2015 |
| Creators | Moura, Carlos Gomes de |
| Contributors | 13097628487, http://lattes.cnpq.br/0246709532151067, Andrade, Humberto Dionisio de, 91620040425, http://lattes.cnpq.br/1253785596446469, Silva, Jos? Patroc?nio da, 67160042468, http://lattes.cnpq.br/5753289728835624, Sousa Neto, Marinaldo Pinheiro de, 06496972435, http://lattes.cnpq.br/2524160890713257, Martins, Ronaldo de Andrade, 05644097404, http://lattes.cnpq.br/0978273656336966, Fernandes, Humberto C?sar Chaves |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA EL?TRICA E DE COMPUTA??O, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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