Comparative Study on the Effective Dielectric Constant of the Graded Composites

Comparative Study on the Effective Dielectric Constant of the Graded Composites
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梯度复合材料有效介电常数的比较研究

DOI:
10.4028/www.scientific.net/amr.677.192
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发表时间:
2013-03
期刊:
Advanced Materials Research
影响因子:
--
通讯作者:
Erjun Liang
Erjun Liang
中科院分区:
其他
文献类型:
--
作者:
Chunzhen Fan;Junqiao Wang;Erjun Liang

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采用非线性微分有效偶极近似法(NDEDA)、Maxwell-Garnette法(MGT)和求和规则法(sum)三种不同的方法计算梯度复合材料的有效介电常数。在梯度复合材料的每一层中,介电常数的分布遵循德鲁德形式。数值结果表明,当梯度复合材料层数N增加时,可以明显地从尖峰逐渐过渡到出现的宽连续带。此外,当N趋于无穷时,MGT和求和规则方法与NDEDA方法的结果吻合较好。
The effective dielectric constant of the graded composites was calculated with three different methods, namely, the nonlinear differential effective dipole approximation method (NDEDA), the Maxwell-Garnette method (MGT) and the sum rule method (Sum). In each layer of the graded composites, the distribution of the dielectric constant follows a Drude form. Our numerical results show that when the number of layers N inside the graded composites increases, a gradual transition from sharp peaks to an emerging broad continuous band is clearly obtained. Moreover, the results obtained by the MGT and sum rule methods achieve a good agreement with that by the NDEDA method when N is approaching infinity.
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