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http://dx.doi.org/10.7234/kscm.2011.24.2.038

Study on Design and Performance of Microwave Absorbers of Carbon Nanotube Composite Laminates  

Kim, Jin-Bong (한국기계연구원 부설 재료연구소 복합재료그룹)
Kim, Chun-Gon (한국과학기술원 기계공학과 항공우주공학)
Publication Information
Composites Research / v.24, no.2, 2011 , pp. 38-45 More about this Journal
Abstract
In this paper, we present an optimization method for the single Dallenbach-layer type microwave absorbers composed of E-glass fabric/epoxy composite laminates. The composite prepreg containing carbon nanotubes (CNT) was used to control the electrical property of the composites laminates. The design technology using the genetic algorithm was used to get the optimal thicknesses of the laminates and the filler contents at various center frequencies, for which the numerical model of the complex permittivity of the composite laminate was incorporated. In the optimal design results, the content of CNT increased in proportion to the center frequency, but, on the contrary, the thickness of the microwave absorbers decreased. The permittivity and reflection loss are measured using vector network analyzer and 7 mm coaxial airline. The influence of the mismatches in between measurement and prediction of the thickness and the complex permittivity caused the shift of the center frequency, blunting of the peak at the center frequency and the reduction of the absorbing bandwidth.
Keywords
Carbon nano tube; Microwave absorber; Complex permittivity; Dielectric constant; Conductivity;
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