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http://dx.doi.org/10.7234/kscm.2006.19.5.028

A Study on Carbon Nano Materials as Conductive Oilers for Microwave Absorbers  

Lee, Sang-Kwan (한국기계연구원 신기능재료본부 복합재료팀)
Kim, Chun-Gon (한국과학기술원 기계공학과)
Kim, Jin-Bong (한국기계연구원 신기능재료본부 복합재료팀)
Publication Information
Composites Research / v.19, no.5, 2006 , pp. 28-33 More about this Journal
Abstract
In this paper, we have studied the complex permittivities and their influence on the design of microwave absorbers of E-glass fabric/epoxy composite laminates containing three different types of carbon-based nano conductive fillers such as carbon black (CB), carbon nano fiber (CNF) and multi-wall nano tube (MWNT). The measurements were performed fur permittivities at the frequency band of 0.5 GHz$\sim$18.0 GHz using a vector network analyzer with a 7 mm coaxial air line. The experimental results show that the complex permittivities of the composites depend strongly on the natures and concentrations of the conductive fillers. The real and imaginary parts of the complex permittivities of the composites were proportional to the filler concentrations. But, depending on the types of fillers and frequency band, the increasing rates of the real and imaginary parts with respect to the filler concentrations were all different. These different rates can have an effect on the thickness in designing the single layer microwave absorbers. The effect of the different rates at 10 GHz was examined by using Cole-Cole plot; the plot is composed of a single layer absorber solution line and measured permittivities from these three types of composites. Single layer absorbers of 3 different thicknesses using carbon nano materials were fabricated and the -10 dB band of absorbing performances were all about 3 GHz.
Keywords
Carbon Black; Carbon nano fiber; Carbon nano tube; Composite; Microwave; Complex permittivity; Absorber;
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