Electromagnetic and Microwave Absorption Properties of Carbonyl-Iron-Fe91Si9 Composites in Gigahertz RangeReport as inadecuate




Electromagnetic and Microwave Absorption Properties of Carbonyl-Iron-Fe91Si9 Composites in Gigahertz Range - Download this document for free, or read online. Document in PDF available to download.

Carbonyl-iron-Fe91Si9 composites for thin microwave absorbers were firstly prepared by a simple blending technique. The patterns of carbonyl-iron and Fe91Si9 were characterized by scanning electron microscope SEM. The complex permittivity, permeability and microwave absorption properties of the composites were studied in the frequency range of 2 - 7GHz by a HP8720B vector network analyzer. Complex permittivity and permeability decrease gradually with increasing weight percentage of Fe91Si9 in the composites, the variation of permittivity was very large but the variation of permeability was very small. The composites exhibited excellent microwave absorption properties with increasing Fe91Si9 content. The reflection loss RL values less than –20 dB were obtained in the 3.7 - 6.7 GHz frequency range for the paraffin matrix composites with 80 wt% carbonyl-iron-Fe91Si9 powders weight ratio of carbonyl-iron to Fe91Si9 was 1:1, with thickness of 4.0 - 2.4 mm, respectively. The optimal RL of –45 dB was observed at 5.2 GHz with a matching thickness dm of 3.0 mm. The excellent microwave absorption properties were attributed to a better electromagnetic impedance match and a higher electric resistivity.

KEYWORDS

Carbonyl-iron, Fe91Si9, Electromagnetic Properties, Microwave Absorption

Cite this paper

J. Guo, Y. Duan, L. Liu, L. Chen and S. Liu -Electromagnetic and Microwave Absorption Properties of Carbonyl-Iron-Fe91Si9 Composites in Gigahertz Range,- Journal of Electromagnetic Analysis and Applications, Vol. 3 No. 5, 2011, pp. 140-146. doi: 10.4236-jemaa.2011.35023.





Author: Jingbo Guo, Yuping Duan, Lidong Liu, Liyang Chen, Shunhua Liu

Source: http://www.scirp.org/



DOWNLOAD PDF




Related documents