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A Study on the Simulation of Complex Permittivities of Carbon Black/Epoxy Composites at a High Frequency Band  

Kim Tae-Wook (한국기계연구원 공정연구부 복합재료그룹)
Kim Chun-Gon (한국과학기술원 항공우주공학)
Kim Jin-Bong (한국기계연구원 공정연구부 복합재료그룹)
Publication Information
Composites Research / v.18, no.3, 2005 , pp. 14-20 More about this Journal
Abstract
This paper presents a study on the permittivities of the carbon black/epoxy composite at microwave frequency. The measurements were performed at the frequency band of $1\;GHz\~18\;GHz$. The experimental data show that the complex permittivities of composites depend strongly on the natures and concentrations of the carbon black dispersion. The frequency characteristics of dielectric constants and ac conductivities of composites show the good conformity with descriptions of the percolation theory, satisfying the general scaling relation. The measuring frequency band is over the critical frequency, below that the ac conductivities of composites are constant to the frequency. The values of dielectric constants and ac conductivities have consistent relationships with the carbon black concentration. The A new scheme, that is a branch of Lichtenecker-Rother formula, is proposed to obtain a mixing law to describe the complex permittivities of the composites as function frequency and concentration of carbon black.
Keywords
Dielectric; Conductivity; Carbon Black; Epoxy; Composite; Simulation; Microwave; Complex permittivity;
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