Made available in DSpace on 2014-12-17T14:55:45Z (GMT). No. of bitstreams: 1 HugoMCAM_DISSERT_partes autorizadas.pdf: 586809 bytes, checksum: e96d1467d4ab6c5fa6da39927cde0bca (MD5) Previous issue date: 2010-07-09 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This work has as main objective to study the application of microstrip antennas with patch and use of superconducting arrays of planar and linear phase. Was presented a study of the main theories that explain clearly the superconductivity. The BCS theory, Equations of London and the Two Fluid Model are theories that supported the implementation of the superconducting microstrip antennas. Arrangements phase was analyzed in linear and planar configuration of its antennas are reported factors such arrays to settings and criteria of phase and the spacing between the elements that make the arrayst was reviewed in order to minimize losses due to secondary lobes. The antenna used has a rectangular patch Sn5InCa2Ba4Cu10Oy the superconducting material was analyzed by the method of Transverse Transmission Line (TTL) applied in the field of Fourier transform (FTD). The TTL is a full-wave method, which has committed to obtaining the electromagnetic fields in terms of cross-cutting components of the structure. The inclusion of superconducting patch is made using the boundary condition, complex resistive. Are obtained when the resonant frequency depending on the parameters of the antenna, radiation pattern of E-Plan and H-Plan for the M-phase arrangements of antennas in the linear and planar configurations for different values of phase and spacing between the elements. / Este trabalho tem como objetivo principal o estudo da aplica??o de antenas de microfita com patch supercondutor e uso dos arranjos de fase linear e planar. 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. Os arranjos de fase foram analisados em configura??es lineares e planares de suas antenas. Foram obtidos os fatores de arranjos para tais configura??es e os crit?rios da fase e do espa?amento entre os elementos que comp?e o arranjo, ao qual foram examinados com o objetivo de obter um l?bulo principal com alta diretividade e alto ganho. A antena utilizada tem como patch retangular o material supercondutor Sn5InCa2Ba4Cu10Oy foi analisada atrav?s 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 das 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; diagramas de radia??o do Plano-E e Plano-H para os arranjos de fase de antenas nas configura??es lineares e planares para diferentes valores da fase e espa?amento entre os elementos.

Made available in DSpace on 2014-12-17T14:56:05Z (GMT). No. of bitstreams: 1 KesiaCS.pdf: 532004 bytes, checksum: e5e91d569fd4794eb815f8bbbd565c37 (MD5) Previous issue date: 2005-12-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Recently the planar antennas have been studied due to their characteristics as well as the advantages that they offers when compared with another types of antennas. In the mobile communications area, the need for this kind of antennas have became each time bigger due to the intense increase of the mobile communications that needs of antennas which operate in multifrequency and wide bandwidth. The microstrip antennas presents narrow bandwidth due the loss in the dielectric generated by radiation. Another limitation is the radiation pattern degradation due the generation of surface waves in the substrate. In this work some used techniques to minimize the disadvantages (previously mentioned) of the use of microstrip antennas are presented, those are: substrates with PBG material - Photonic Bandgap, multilayer antennas and with stacked patches. The developed analysis in this work used the TTL - Transverse Transmission Line method in the domain of Fourier transform, that uses a component of propagation in the y direction (transverse to the direction real of propagation z), treating the general equations of electric and magnetic field as functions of y and y . This work has as objective the application of the TTL method to microstrip structures with single and multilayers of rectangular and triangular patches, to obtaining the resonance frequency and radiation pattern of each structure. This method is applied for the treatment of the fields in stacked structures. The Homogenization theory will be applied to obtaining the effective permittivity for s and p polarizations of the substrate composed of PBG material. Numerical results for the triangular and rectangular antennas with single layer, multilayers resonators with triangular and rectangular patches are presented (in photonic and isotropic substrates). Conclusions and suggestions for continuity of this work are presented / Recentemente as antenas planares t?m despertado interesses devido ?s suas caracter?sticas assim como pelas vantagens que oferecem quando comparadas com os demais tipos de antenas. Na ?rea de comunica??es m?veis a necessidade de antenas desse tipo tem se tornado cada vez maior devido ao intenso crescimento das comunica??es m?veis que necessitam de antenas que operem em multifreq??ncia e em banda larga. As antenas de microfita apresentam largura de banda estreita devido ?s perdas no diel?trico geradas pela irradia??o. Outra limita??o ? a degrada??o do diagrama de irradia??o devido ? gera??o de ondas de superf?cie no substrato. Neste trabalho s?o apresentadas algumas t?cnicas usadas para tentar minimizar as desvantagens (citadas acima) do uso de antenas de microfita, sendo elas: substratos com material PBG – Photonic Bandgap, antenas em multicamadas e com patches empilhados. As an?lises desenvolvidas neste trabalho foram realizadas com a utiliza??o do m?todo LTT – Linha de Transmiss?o Transversa no dom?nio da transformada de Fourier que utiliza uma componente de propaga??o na dire??o y (transversa ? dire??o real de propaga??o z), tratando assim as equa??es gerais dos campos el?tricos e magn?ticos em fun??es de y e y . Este trabalho tem como objetivo a aplica??o do m?todo LTT ?s estruturas de microfita com uma e multicamadas de patch retangular e triangular, para a obten??o da freq??ncia de resson?ncia e diagrama de irradia??o de cada estrutura. Este m?todo ? aplicado para o tratamento dos campos em estruturas planares empilhadas. A teoria da Homogeneiza??o ser? aplicada para a obten??o da permissividade efetiva para as polariza??es s e p dos substratos compostos de material PBG - Photonic Bandgap. Resultados num?ricos para as antenas triangulares e retangulares com uma camada e ressoadores com multicamadas de patch retangular e triangular s?o apresentados (em substratos isotr?picos e fot?nicos). S?o apresentadas conclus?es e sugest?es para a continuidade deste trabalho

<p><em>With the advent of huge multicore processors, complex hardware, intermingled networks and huge disk storage capabilities the programs that are used in the system and the code which is written to control them are increasingly getting large and often much complicated. There is increase in need of a framework which tracks issues, debugs the program, helps to analyze the reason behind degradation of system and program performance. Another big concern for deploying such a framework in complex systems is to the footprint of the framework upon the setup. LTTng project aims to provide such an effective tracing and debugging toolset for Linux systems. Our work is to measure the effectiveness of LTTng in a Multicore Environment and evaluate its affect on the system and program performance. We incorporate Control and Data Flow analysis of the system and the binaries of LTTng to reach for a conclusion.</em></p>

With the advent of huge multicore processors, complex hardware, intermingled networks and huge disk storage capabilities the programs that are used in the system and the code which is written to control them are increasingly getting large and often much complicated. There is increase in need of a framework which tracks issues, debugs the program, helps to analyze the reason behind degradation of system and program performance. Another big concern for deploying such a framework in complex systems is to the footprint of the framework upon the setup. LTTng project aims to provide such an effective tracing and debugging toolset for Linux systems. Our work is to measure the effectiveness of LTTng in a Multicore Environment and evaluate its affect on the system and program performance. We incorporate Control and Data Flow analysis of the system and the binaries of LTTng to reach for a conclusion.

Made available in DSpace on 2014-12-17T14:55:12Z (GMT). No. of bitstreams: 1 HugoMCAM_TESE.pdf: 1103719 bytes, checksum: a172421f313d978128130ee22edd6743 (MD5) Previous issue date: 2013-07-30 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The main objective in this work is the analysis of resonance frequency microstrip structures with glass fiber and electromagnetic band gap (EBG/PBG) substrate and analysis of microstrip antennas with rectangular patch of superconductor of high critical temperature (HTS). In this work was used the superconductors YBCO (critical temperature of 90K), SnBaCaCuOy (critical temperature of 160K), and Sn5InCa2Ba4Cu10Oy (critical temperature of 212K) with results in Gigahertz and Terahertz. Was used microstrip antennas arrays planar and linear phase and linear phase planar with patch with superconductor. It presents a study of the major theories that explain superconductivity. In phase arrays were obtained the factors arrays for such configurations, and the criteria of phase and spacing between the elements compound in the array, which were examined in order to get a main lobe with high directivity and high gain. In the analysis we used the method of Transverse Transmission Line (TTL) used in domain of the Fourier Transform (FTD). The LTT is a full wave method, which obtains the electromagnetic field in terms of the components transverse of the structure. The addition of superconductive patch is made using the boundary condition resistive complex. Results are obtained resonance frequency as a function of the parameters of the antenna, radiation patterns of the E and H Planes, for the phase antenna arrays in linear and planar configurations, for different values of the phase and the spacing between elements / Este trabalho tem como objetivo principal a an?lise da frequ?ncia de resson?ncia em estruturas de microfita, com substrato de banda eletromagn?tica proibida (PBG/EBG) e fibra de vidro, e an?lise de antenas de microfita, com patch retangular supercondutor de alta temperatura cr?tica. Neste trabalho foram utilizados os supercondutores YBCO (temperatura cr?tica de 90K), SnBaCaCuOy (temperatura cr?tica de 160K),e Sn5InCa2Ba4Cu10Oy (temperatura cr?tica de 212K) com resultados das frequ?ncias de resson?ncia em Gigahertz (microondas) e Terahertz (fot?nica/nanotecnologia). S?o realizadas aplica??es em arranjos lineares e planares de antenas de microfita com varia??o de fase, usando o patch supercondutor. ? apresentado um estudo das principais teorias que explicam a supercondutividade. Nos arranjos de fase foram obtidos os fatores de arranjos para tais configura??es, e os crit?rios da fase e do espa?amento entre os elementos compondo o arranjo, ao qual foram examinados com o objetivo de obter um l?bulo principal com alta diretividade e alto ganho. Na an?lise utilizou-se o 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, em que se obt?m os 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 frequ?ncia de resson?ncia em fun??o dos par?metros da antena, diagramas de radia??o dos planos el?tricos e magn?ticos, para os arranjos de fase de antenas nas configura??es lineares e planares para diferentes valores da fase e espa?amento entre os elementos

Made available in DSpace on 2014-12-17T14:55:33Z (GMT). No. of bitstreams: 1 LuizPR_capa_ate_pag32.pdf: 10174552 bytes, checksum: f00a2c8563a56492c32dbcc9b7a7e750 (MD5) Previous issue date: 2002-03-15 / One of the objectives of this work is the ana1ysis of planar structures using the PBG (photonic Bandgap), a new method of controlling propagation of electromagnetic waves in devices with dielectrics. Here the basic theory of these structures will be presented, as well as applications and determination of certain parameters. In this work the analysis will be performed concerning PBG structures, including the basic theory and applications in planar structures. Considerations are made related to the implementation of devices. Here the TTL (Transverse Transmission Line) method is employed, characterized by the simplicity in the treatment of the equations that govern the propagation of electromagnetic waves in the structure. In this method, the fields in x and z are expressed in function of the fields in the traverse direction y in FTD (Fourier Transform Domain). This method is useful in the determination of the complex propagation constant with application in high frequency and photonics. In this work structures will be approached in micrometric scale operating in frequencies in the range of T erahertz, a first step for operation in the visible spectra. The mathematical basis are approached for the determination of the electromagnetic fields in the structure, based on the method L TT taking into account the dimensions approached in this work. Calculations for the determination of the constant of complex propagation are also carried out. The computational implementation is presented for high frequencies. at the first time the analysis is done with base in open microstrip lines with semiconductor substrate. Finally, considerations are made regarding applications ofthese devices in the area of telecommunications, and suggestions for future / Um dos objetivos desta disserta??o ? a an?lise de estruturas planares utilizando a tecnologia PBG, uma nova forma de controle de propaga??o de sinais em dispositivos com diel?tricos. Aqui ser? apresentada a teoria b?sica destas estruturas e aplica??es bem como a determina??o de par?metros em escala fot?nica, ou seja, estruturas que usam sinais de luz e t?tons. Nesta disserta??o ser?o feitas an?lises a respeito de estruturas PBG, abrangendo a teoria b?sica e aplica??es em estruturas planares. Conmsidera??es s?o feiras quanto ? implementa??o de dispositivos. O m?todo utilizado ? o LTT - Linas de Transmiss?o Transversa, caracterizado pela simplicidade no tratamento das equa??es que regem a propaga??o de ondas eletromagn?ticas e ?pticas na dire??o transvesal e no FTD ( Dom?nio da Transformda de Fouries). Este m?todo ? ?til na determina??o da constante de propaga??o complexa com aplica??o em alta freq??ncia e fot?nica. Nesta tese ser?o abordadas estruturas em escala microm?trica operando em freq??ncias na faixa de Terahertz, um primeiro passo para opera??o na faixa de luz. Ser? abordada a base matem?tica para a determina??o dos campos eletromagn?ticos na estrutura, baseado no m?todo LTT levando em considera??o as dimens?es abordadas neste trabalho. Ser?o considerados tamb?m os c?lculos para a determina??o da constante de propaga??o complexa. A implementa??o computacional ? apresentada para valores elevados de freq??ncia. A princ?pio as an?lises ser?o feitas com base em linhas de microfita abertas com substrato com semicondutor. Finalmente ser?o feitas considera??es a respeito de aplica??es destes dispositivos na ?rea de telecomunica??es, e sugest?es para futuros trabalhos

Made available in DSpace on 2014-12-17T14:55:34Z (GMT). No. of bitstreams: 1 GeorgeDFA_Capa_ate_pag15.pdf: 8968407 bytes, checksum: 05f7b40d8df8312cf173aaad3ec43f83 (MD5) Previous issue date: 2006-08-04 / Recently, planar antennas have been studied due to their characteristics as well as the advantages that they offers when compared with another types of antennas. In the mobile communications area, the need for this kind of antennas have became each time bigger due to the intense increase of the mobile communications this sector. That needs of antennas which operate in multifrequency and wide bandwidth. The microstrip antennas presents narrow bandwidth due the loss in the dielectric generated by radiation. Another limitation is the radiation pattern degradation due the generation of surface waves in the substrate. In this work some used techniques to minimize the disadvantages (previously mentioned) of the use of microstrip antennas are presented, those are: substrates with PBG material - Photonic Bandgap, multilayer antennas and with stacked patches. The developed analysis in this work used the TTL - Transverse Transmission Line method in the domain of Fourier transform, that uses a component of propagation in the y direction (transverse to the direction real of propagation z), treating the general equations of electric and magnetic field as functions of Ey and Hy. One of the advantages of this method is the simplification of the field equations. therefore the amount of equations lesser must the fields in directions x and z be in function of components Ey and Hy. It will be presented an brief study of the main theories that explain the superconductivity phenomenon. The BCS theory. London Equations and Two Fluids model will be the theories that will give support the application of the superconductors in the microfita antennas. The inclusion of the superconductor patch is made using the resistive complex contour condition. This work has as objective the application of the TTL method to microstrip structures with single and multilayers of rectangular patches, to obtaining the resonance frequency and radiation pattern of each structure / Recentemente as antenas planares t?m despertado interesses devido ?s suas caracter?sticas, assim como pelas vantagens que oferecem quando comparadas com os demais tipos de antenas. Na ?rea de comunica??es m?veis a necessidade de antenas desse tipo tem-se tornado cada vez maior devido ao intenso crescimento desse setor, necessitando de antenas que operem em multifreq??ncia e em banda larga. As antenas de microfita apresentam largura de banda estreita devido ?s perdas no diel?trico geradas pela irradia??o. Outra limita??o ? a degrada??o do diagrama de irradia??o devido ? gera??o de ondas de superf?cie no substrato. Neste trabalho s?o apresentadas algumas t?cnicas usadas para tentar minimizar as desvantagens (citadas acima) do uso de antenas de microfita, sendo elas: substratos com material PBG - Photonic Bandgap, antenas em multicamadas e a utiliza??o de patches fabricados de materiais supercondutores. As an?lises desenvolvidas neste trabalho foram realizadas com a utiliza??o do m?todo LTT - Linha de Transmiss?o Transversa no dom?nio da transformada de Fourier, que utiliza uma componente de propaga??o na dire??o y (transversa ? dire??o real de propaga??o z), tratando assim as equa??es gerais dos campos el?tricos e magn?ticos em fun??es de Ey e Hy. Uma das vantagens desse m?todo ? a simplifica??o das equa??es de campo, pois a quantidade de equa??es ? menor devido os campos nas dire??es x e z ficarem em fun??o das componentes Ey e Hy. Ser? apresentado um breve estudo das principais teorias que explicam o fen?meno da supercondutividade. As teorias BCS, Equa??es de London e modelo dos Dois Fluidos ser?o as teorias que dar?o suporte a aplica??o dos supercondutores nas antenas microfita. A inclus?o do patch supercondutor ? feita utilizando-se a condi??o de contorno complexa resistiva. Este trabalho tem como objetivo a aplica??o do m?todo LTT ?s estruturas de microfita