Double-layer microwave absorber of nanocrystalline strontium ferrite and iron microfibers

doi:10.1088/1674-1056/21/2/028101

Abstract Microwave absorption properties of the nanocrystalline strontium ferrite (SrFe₁₂O₁₉) and iron ($\alpha$-Fe) microfibers for single-layer and double-layer structures are investigated in a frequency range of 2 GHz-18 GHz. For the single-layer absorbers, the nanocrystalline SrFe₁₂O₁₉ microfibers show some microwave absorptions at 6 GHz-18 GHz, with a minimum reflection loss (RL) value of -11.9 dB at 14.1 GHz for a specimen thickness of 3.0 mm, while for the nanocrystalline $\alpha$-Fe microfibers, their absorptions largely take place at 15 GHz-18 GHz with the RL value exceeding -10 dB, with a minimum RL value of about -24 dB at 17.5 GHz for a specimen thickness of 0.7 mm. For the double-layer absorber with an absorbing layer of α-Fe microfibers with a thickness of 0.7 mm and matching layer of SrFe₁₂O₁₉ microfibers with a thickness of 1.3 mm, the minimum RL value is about -63 dB at 16.4 GHz and the absorption band width is about 6.7 GHz ranging from 11.3 GHz to 18 GHz with the RL value exceeding -10 dB which covers the whole K_u-band (12.4 GHz-18 GHz) and 27% of X-band (8.2 GHz-12.4 GHz).

Keywords: nanocrystalline microfibers microwave absorber double-layer structure

Received: 17 August 2011
Revised: 16 September 2011
Accepted manuscript online:

PACS:	81.07.Bc	(Nanocrystalline materials)
	75.50.-y	(Studies of specific magnetic materials)
	73.21.Ac	(Multilayers)

Fund: Project supported by the Aviation Science Foundation, China (Grant No. 2009ZF52063), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103227110006), and the Jiangsu Provincial Postgraduate Cultivation and Innovation Project, China (Grant No. CX10B-257Z).

Corresponding Authors: Shen Xiang-Qian,shenxq@ujs.edu.cn
E-mail: shenxq@ujs.edu.cn

Cite this article:

Wei Chun-Yu(韦春余), Shen Xiang-Qian(沈湘黔), and Song Fu-Zhan(宋福展) Double-layer microwave absorber of nanocrystalline strontium ferrite and iron microfibers 2012 Chin. Phys. B 21 028101

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Double-layer microwave absorber of nanocrystalline strontium ferrite and iron microfibers

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