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[1] Xu Hongfei, Xu Lina, Gu Ning, et al. A new electromagnetic functional materialcomposed of metallic hollow micro-spheres [J]. Journal of Southeast University (English Edition), 2003, 19 (1): 8-11. [doi:10.3969/j.issn.1003-7985.2003.01.003]
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A new electromagnetic functional materialcomposed of metallic hollow micro-spheres()
一种新型金属化空心微球电磁功能材料
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
19
Issue:
2003 1
Page:
8-11
Research Field:
Electromagnetic Field and Microwave Technology
Publishing date:
2003-03-30

Info

Title:
A new electromagnetic functional materialcomposed of metallic hollow micro-spheres
一种新型金属化空心微球电磁功能材料
Author(s):
Xu Hongfei1, 2, Xu Lina2, Gu Ning2, Sun Zhongliang1
1State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
2Key Laboratory of Molecular and Bio-molecular Electronics of Ministry of Education, Southeast University, Nanjing 210096, China
徐鸿飞1, 2, 徐丽娜2, 顾宁2, 孙忠良1
1东南大学毫米波国家重点实验室, 南京 210096; 2东南大学分子与生物分子电子学教育部重点实验室, 南京 210096
Keywords:
electromagnetic functional material;  microwave absorbing;  electron-less deposition
电磁功能材料;  微波吸收;  无电子金属化
PACS:
TN804
DOI:
10.3969/j.issn.1003-7985.2003.01.003
Abstract:
This paper presents a new electromagnetic functional material developed by electron-less nickel deposition technique, with a single hollow micro-sphere as the core template and a thin nickel layer as the shell. The micrograph taken by a scanning electron microscope shows the microstructures of the materials in detail. Scattering parameters of the waveguide sample holder filled with the materials have been obtained over X band. The electromagnetic parameters computed from the measured S parameters show that the material with metallic hollow spheres has as high relative permeability μ′r as 19.0 with about 0.6 magnetic loss tangent over the whole bandwidth. Compared to the material with non-metallic spheres, the permeability μ′r and the magnetic loss tangent μ″r increase greatly, while the permittivity remains lower than 1.8.
介绍了一种新型电磁功能材料.该材料由表面无电子镀镍的空心微球组成.采用扫瞄电镜观测了镀镍前后的表面微观结构, 制备成样品放入X波段波导框中, 在微波网络分析仪上进行散射参数测量, 计算了电磁特性参数.结果表明, 该材料在表面镀镍后取得了较高的磁导率(19.0)和磁损耗正切(0.6), 而介电常数保持较低(1.8).与非金属化微球材料相比, 可作为超薄型多层微波吸收材料的基本材料.

References:

[1] Knott E F. The thickness criterion for single-layer radar absorbents [J]. IEEE Trans Antennas Propag, 1979, 27(9):698-701.
[2] Fante R L, Michael T M. Reflection properties of the Salisbury screen[J]. IEEE Trans Antennas Propag, 1988, 36(10): 1443-1454.
[3] Michielssen E, Sajer J M, Ranjthan S, et al. Design of lightweight, broad-band microwave absorbers using genetic algorithms [J]. IEEE Tran MTT, 1993, 41(6):1024-1030.
[4] Ledere P, Brewitt T. Measurement of microwave properties of magnetic particulate composites [J]. IEE Proc of Sci Meas Technol, 2000, 147(4):209-211.
[5] Xu Lina, Zhou Kaichang, Xu Hongfei, et al. Copper thin coating deposition on natural pollen particles[J]. Applied Surface Science, 2001, 183(1/2):58-61.
[6] Juan Munoz, Marta Rojo, Alfredo Parreno, et al. Automatic measurement of permittivity and permeability at microwave frequencies using normal and oblique free-wave incidence with focused beam [J]. IEEE Trans IM, 1998, 47(4):886-892.
[7] Collin R E. Field theory of guided waves, 2nd Ed.[M]. New York: McGraw-Hill, 1991.349-351.
[8] Zhang Keqian. Electromagnetic theory for microwaves and opt electronics[M]. Beijing: Publishing House of Electronics Industry, 2001. 197-253.(in Chinese)
[9] Nicolson A M, Ross G F. Measurement of the intrinsic properties of materials by time-domain techniques[J]. IEEE Trans IM, 1970, 19(4): 77-382.

Memo

Memo:
Biographies: Xu Hongfei(1966—), male, senior engineer, graduate, xuhongfei@seu.edu.cn; Gu Ning, male, professor, guning@seu.edu.cn.
Last Update: 2003-03-20