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@TechReport{PortesQuirBald:2019:CaElMi,
               author = "Portes, Roberto Camargo and Quirino, Sandro Fonseca and Baldan, 
                         Maur{\'{\i}}cio Ribeiro",
                title = "Caracteriza{\c{c}}{\~a}o el{\'e}trica de micro cilindros 
                         maci{\c{c}}os de fibra de carbono na faixa de microondas",
          institution = "Instituto Nacional de Pesquisas Espaciais",
                 year = "2019",
                 type = "RPQ",
              address = "S{\~a}o Jos{\'e} dos Campos",
                 note = "{Bolsa PIBIC/INPE/CNpq}",
             keywords = "Banda  X. Comp{\'o}sito polim{\'e}rico. Fibra de carbono. 
                         Interfer{\^e}ncia Eletromagn{\'e}tica. Materiais atenuadores de 
                         radia{\c{c}}{\~a}o eletromagn{\'e}tica. Par{\^a}metro  S, 
                         Carbon fiber. Electromagnetic Interference. Parameter  S. Polymer 
                         composite. Radiation absorbent materials. X  band.",
             abstract = "Materiais atenuadores de radia{\c{c}}{\~a}o eletromagn{\'e}tica 
                         (MARE) na faixa de frequ{\^e}ncia das microondas tem 
                         atra{\'{\i}}do grande aten{\c{c}}{\~a}o nas 
                         aplica{\c{c}}{\~o}es militares e civis, devido ao grande aumento 
                         de interfer{\^e}ncia eletromagn{\'e}tica que veem causando 
                         s{\'e}rios problemas como o mau funcionamento de dispositivos 
                         eletr{\^o}nicos e os efeitos prejudiciais que podem ser causados 
                         {\`a} sa{\'u}de devido a exposi{\c{c}}{\~a}o {\`a} 
                         radia{\c{c}}{\~a}o eletromagn{\'e}tica. Com o objetivo de 
                         contribuir para o desenvolvimento da tecnologia de MARE no 
                         ambiente aeron{\'a}utico e aeroespacial, este trabalho tem 
                         produzido e caracterizado amostras de comp{\'o}sito 
                         polim{\'e}rico a base de borracha de silicone e filamentos de 
                         fibra de carbono tran{\c{c}}ada. Este estudo analisa a 
                         rela{\c{c}}{\~a}o entre as varia{\c{c}}{\~o}es dos 
                         {\^a}ngulos de orienta{\c{c}}{\~a}o das tran{\c{c}}as de fibra 
                         de carbono na matriz de silicone e a combina{\c{c}}{\~a}o de 
                         multicamadas. A caracteriza{\c{c}}{\~a}o morfol{\'o}gica e 
                         estrutural da fibra de carbono foi obtida atrav{\'e}s das 
                         t{\'e}cnicas de Microscopia Eletr{\^o}nica de Varredura (MEV), 
                         Difratometria de Raios-X (DR-X) e Espectroscopia RAMAN. A 
                         caracteriza{\c{c}}{\~a}o do potencial de atenua{\c{c}}{\~a}o 
                         eletromagn{\'e}tica dos comp{\'o}sitos produzidos, com 1,0 mm de 
                         espessura e orienta{\c{c}}{\~o}es de 0, 30, 60 e 90 no plano 
                         X Y, e uma amostra com a combina{\c{c}}{\~a}o de todas as 
                         orienta{\c{c}}{\~o}es dispostas em multicamadas e com espessura 
                         de 4,0 mm, foram avaliados atrav{\'e}s do Analisador Vetorial de 
                         Redes (VNA) na faixa de frequ{\^e}ncia referente {\`a} Banda-X 
                         (8,2 12,4 GHz). Neste sentido as amostras produzidas foram 
                         minuciosamente estudadas afim de se identificar o seu potencial de 
                         atenua{\c{c}}{\~a}o de radia{\c{c}}{\~a}o eletromagn{\'e}tica 
                         com rela{\c{c}}{\~a}o {\`a}s varia{\c{c}}{\~o}es do 
                         {\^a}ngulo de orienta{\c{c}}{\~a}o das fibras no interior da 
                         matriz de silicone e {\`a} radia{\c{c}}{\~a}o incidente. Os 
                         resultados do par{\^a}metro de espalhamento (Par{\^a}metro S) 
                         das amostras apresentaram valores muito significativos para {\`a} 
                         aplica{\c{c}}{\~a}o como MARE, sendo os valores obtidos 
                         similares aos de materiais met{\'a}licos com alto {\'{\i}}ndice 
                         de reflex{\~a}o e baixo {\'{\i}}ndice de transmiss{\~a}o, com 
                         (S11 S22) variando entre 0.93 {\`a} 0.99 e (S21 S12) entre 0.05 
                         {\`a} 0.0 para todas as amostras analisadas nesse trabalho. 
                         ABSTRACT: Radiation absorbent materials (RAM) in the frequency 
                         range of microwaves have attracted great attention in military and 
                         civil applications due to the great increase of electromagnetic 
                         interference that it is causing serious problems like the 
                         malfunction of electronic devices and the harmful effects that can 
                         be caused by exposure to electromagnetic radiation. With the 
                         objective of contributing to the development of the RAM technology 
                         in the aeronautical and aerospace environment, this work has 
                         produced and characterized polymer composite samples based on 
                         silicone rubber and braided filaments of carbon fiber. This study 
                         analyzes the relationship between the orientation angles of the 
                         carbon fiber braids in the silicone matrix and the combination of 
                         multilayers. The morphological and structural characterization of 
                         the carbon fibers were obtained through the Scanning Electron 
                         Microscopy (SEM), X-ray Diffraction (DR-X) and RAMAN spectroscopy 
                         techniques. The characterization of the electromagnetic 
                         attenuation potential of the composites produced with a thickness 
                         of 1.0 mm and orientations of 0 , 30 , 60  and 90  in the X Y 
                         plane, and one sample with the combination of all orientations in 
                         a multilayer arrangement and thickness of 4.0 mm, were analized by 
                         the Vector Network Analyzer (VNA) in the frequency range of the X 
                         band (8.2 - 12.4 GHz). In this work the samples produced were 
                         carefully studied in order to identify their potential of 
                         attenuation of the incident electromagnetic radiation with respect 
                         to the variations of the orientation angles of the carbon fibers 
                         inside the matrix of silicone. The results of the scattering 
                         parameter (Parameter S) of the samples presented very significant 
                         values for the application as MARE, and the values obtained were 
                         similar to those of metallic materials with high reflection index 
                         and low transmission index, with (S11 S22) varying between 0.93 
                         and 0.99 and (S21 S12) between 0.05 and 0.0 for all samples 
                         analyzed in this work.",
          affiliation = "{ETEP Faculdades} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
             language = "pt",
                pages = "40",
                  ibi = "8JMKD3MGP3W34R/3U3RLUH",
                  url = "http://urlib.net/rep/8JMKD3MGP3W34R/3U3RLUH",
           targetfile = "ROBERTO PORTES.pdf",
        urlaccessdate = "11 abr. 2021"
}


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