Experimental and theoretical investigation on the high frequency dielectric properties of Ag/Al2O3 composites
Experimental and theoretical investigation on the high frequency dielectric properties of Ag/Al2O3 composites
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DOI：
10.1063/1.3608156
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发表时间：
2011-07-18
影响因子：
4
通讯作者：
Yin, L. W.
中科院分区：
文献类型：
--
作者：
Shi, Z. C.;Fan, R. H.;Yin, L. W.
实验研究了Ag/Al2O3复合材料在100 MHz ~ 1 GHz频率范围内的阻抗和介电性能。并进行了等效电路分析和数值仿真。当银负载足够高时，复合材料会形成电流通路，并出现负介电常数。负介电常数可以用有损德鲁德模型很好地描述。此外，负介电常数样品表现出电感特性，并在其等效电路中加入分流电感。数值模拟结果表明，银粒子的相互作用导致负介电常数，从而导致电磁波的严重衰减。(C) 2011年美国物理研究所。(doi: 10.1063/1.3608156)
The impedance and dielectric properties of Ag/Al2O3 composites are investigated experimentally in the frequency range from 100 MHz to 1 GHz. Besides, equivalent circuit analysis and numerical simulations were carried out. For the composites with sufficiently high silver loading, current paths were formed and negative permittivity appeared. The negative permittivity can be well described by lossy Drude model. Moreover, the negative permittivity sample manifests inductive characteristic and shunt inductors are added to its equivalent circuit. Numerical simulations show that the interconnection of silver particles results in negative permittivity, hence the serious attenuation of electromagnetic waves. (C) 2011 American Institute of Physics. [doi:10.1063/1.3608156]