@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/ibi/8JMKD3MGP3W34R/3U3RLUH",
targetfile = "ROBERTO PORTES.pdf",
urlaccessdate = "27 abr. 2024"
}