Microwave-absorbing properties of de-aggregated flake-shaped carbonyl-iron particle composites at 2-18 GHz
Microwave-absorbing properties of de-aggregated flake-shaped carbonyl-iron particle composites at 2-18 GHz
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DOI：
10.1109/tmag.2006.874188
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发表时间：
2006-06
影响因子：
2.1
通讯作者：
Baoshan Zhang;Yong Feng;J. Xiong;Yi Yang;H. Lu
中科院分区：
文献类型：
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作者：
Baoshan Zhang;Yong Feng;J. Xiong;Yi Yang;H. Lu
研究了不同形状和聚集状态的羰基铁颗粒在不同体积浓度下分散在环氧树脂基体中的吸波性能。本文讨论了微波介电常数/spl epsiv//sub r/=/spl epsiv/“-j/spl epsiv/”和磁导率/spl mu//sub r/=/spl mu/“-j/spl mu/”对低反射系数的要求。与团聚的球形颗粒（SS）相比，解团聚的片状羰基铁颗粒（FS）具有更高的磁导率、更低的介电常数、更好的环氧树脂填充特性以及在2-18 GHz频率范围内更好的吸波性能。对于体积分数为0.60、单层厚度为1 mm的FS复合材料，计算得到的2GHz反射损耗为-4.04dB，4.4GHz反射损耗最小为-12.2dB，表明FS复合材料可以作为S波段的薄吸波材料。结果还表明，不同的体积浓度可以在不同的波段有较高的吸收，这一事实可以作为设计吸波材料的依据。
We have investigated the microwave-absorbing properties for different shapes and aggregated states of carbonyl-iron particles dispersed in epoxy resin matrix at various volume concentrations. Here, we discuss the requirements of lower reflection coefficient for the microwave permittivity /spl epsiv//sub r/=/spl epsiv/'-j/spl epsiv/'' and permeability /spl mu//sub r/=/spl mu/'-j/spl mu/''. Compared to the aggregated sphere-shaped particles (SS), the de-aggregated flake-shaped carbonyl iron particles (FS) have higher permeability, lower permittivity, better filling characteristics in epoxy resin, and better absorbing properties in the frequency range of 2-18 GHz. For the FS composite with volume fraction of 0.60 at single-layer thickness of 1 mm, the calculated reflection loss at 2 GHz reaches -4.04 dB and the minimum reflection loss is -12.2 dB at 4.4 GHz, which indicates that the FS composite can be applied as a thinner microwave absorber in the S-band than if SS particles are used. The results also show that different volume concentrations can have high absorption at different wave bands, a fact on which the design of absorbing material can be based.