Iron based carbon nanocomposites for electromagnetic wave absorber with wide bandwidth in GHz range
Iron based carbon nanocomposites for electromagnetic wave absorber with wide bandwidth in GHz range
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DOI：
10.1007/s00339-005-3417-8
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发表时间：
2006-03-01
影响因子：
2.7
通讯作者：
Machida, K
中科院分区：
文献类型：
--
作者：
Liu, JR;Itoh, M;Machida, K
采用传统的反射/透射技术，对含有40 vol. % α - fe /C(a)和Fe3C/C(a)复合粉末的树脂压片在0.05 ~ 26.5 GHz频率范围内的电磁波吸收特性进行了表征。α - fe /C(a)树脂复合材料相对介电常数的实部（epsilon′(r)）和虚部（epsilon′(r)）在2-14 GHz (epsilon′（r) = 12.4和epsilon′(r) = 0.6）和1-26.5 GHz (epsilon′（r) = 9.6和epsilon′(r) = 0.8）范围内持续较低。由于α - fe /C(a)和Fe3C/C(a)的磁晶各向异性场值不同，相对磁导率的虚部（mu”(r)）在1 ~ 9 GHz和2 ~ 26.5 GHz范围内呈现宽峰。结果表明，含40 vol. % α - fe /C(a)和Fe3C/C(a)粉末的树脂致密体在吸收厚度分别为1.8-3.3 mm和1.0-2.4 mm的4.3-8.2 GHz和9-26.5 GHz范围内具有良好的电磁波吸收性能（反射损耗< -20 dB）。
The electromagnetic wave absorption properties of resin compacts containing 40 vol. % composite powders of alpha-Fe/C(a), and Fe3C/C(a) were characterized in a frequency range of 0.05-26.5 GHz, according to a conventional reflection/transmission technique. The real part (epsilon'(r)) and the imaginary part (epsilon'(r)) of relative permittivity were constantly low in the 2-14 GHz (epsilon'(r) = similar to 12.4 and epsilon''(r) = similar to 0.6) for alpha-Fe/C(a) resin composites, and in the 1-26.5 GHz (epsilon'(r) = similar to 9.6 and epsilon''(r) = similar to 0.8) for Fe3C/C(a) ones. The imaginary part (mu''(r)) of relative permeability exhibited wide peaks in the 1-9 GHz range for alpha-Fe/C(a), and in the 2-26.5 GHz range for Fe3C/C(a) owing to their different magnetocrystalline anisotropy field values. Consequently, the resin compacts with 40 vol. % alpha-Fe/C(a), and Fe3C/C(a) powders provided good electromagnetic wave absorption performances (reflection loss < -20 dB) in ranges of 4.3-8.2 GHz, and 9-26.5 GHz over absorber thicknesses of 1.8-3.3 mm, and 1.0-2.4 mm, respectively.