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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Bianisotropia uniaxial em estruturas irradiantes com multicamadas e supercondutores

Fran?a, Roberto Ranniere Cavalcante de 10 March 2009 (has links)
Made available in DSpace on 2014-12-17T14:55:12Z (GMT). No. of bitstreams: 1 RobertoRCF.pdf: 849885 bytes, checksum: 4d53af5d41e5eb5a8eb261ca52870951 (MD5) Previous issue date: 2009-03-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work presents a theoretical and numerical analysis of parameters of a rectangular microstrip antenna with bianisotropic substrate, and including simultaneously the superconducting patch. The full-wave Transverse Transmission Line - TTL method, is used to characterize these antennas. The bianisotropic substrate is characterized by the permittivity and permeability tensors, and the TTL gives the general equations of the electromagnetic fields of the antennas. The BCS theory and the two fluids model are applied to superconductors in these antennas with bianisotropic for first time. The inclusion of superconducting patch is made using the complex resistive boundary condition. The resonance complex frequency is then obtained. Are simulated some parameters of antennas in order to reduce the physical size, and increase the its bandwidth. The numerical results are presented through of graphs. The theoretical and computational analysis these works are precise and concise. Conclusions and suggestions for future works are presented / Este trabalho apresenta a an?lise te?rica e num?rica dos par?metros de uma antena de micro?ta do tipo retangular sobre substrato bianisotr?pico e tamb?m incluindo simul-taneamente supercondutor na antena. ? aplicada a teoria de onda completa do m?todo da Linha de Transmiss?o Transversa - LTT, para a caracteriza??o das grandezas do substrato e obten??o das equa??es gerais dos campos eletromagn?ticos. ? realizado um estudo atrav?s da teoria bianisotr?pica com o intuito de obter alguns par?metros. Os mesmos s?o caracterizados atrav?s de tensores permissividade e permeabilidade, chegando-se ?s equa??es gerais para os campos eletromagn?ticos da antena. ? apresentado um estudo das principais teorias que explicam o fen?meno da super-condutividade. As teorias BCS, Equa??es de London e modelo dos Dois Fluidos s?o usadas no estudo nas antenas de microfita com estrutura bianisotr?pica pela primeira vez. A inclus?o do patch supercondutor ? feita utilizando-se a condi??o de contorno com-plexa resistiva. Em seguida ? obtida a freq??ncia de resson?ncia complexa. S?o simu-lados v?rios par?metros de antenas com o intuito de diminuir as dimens?es f?sicas e aumentar a largura de banda das mesmas. Os resultados s?o apresentados atrav?s de gr?ficos. A an?lise te?rico-computacional desse trabalho se mostra precisa e relati-vamente concisa. S?o apresentadas as conclus?es e sugest?es para trabalhos futuros

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