Analysis of Absorption Properties for Magnetism-Absorbing Agents Mixed with Semiconductor Particulate

Abstract:

In order to improve absorbing properties of material effectively, enhance the ability of attenuating electromagnetic wave, and at the same time, make the impedance matching with air to the most extent, this paper mixed ferrite magnetism microwave-absorbing agents with semiconductor particulates. We got the effective EM parameter of the mixture using effective EM parameter model, and then analyzed absorption properties. As the result, it figured out the cubage proportion and conductance of semiconductor particulates based on the resistance matching principle. Through calculating the reflection ratio、impedance matching characteristic and attenuation coefficient of the material, it is proved that mixing ferrite magnetism microwave-absorbing agents with semiconductor particulate which has less permittivity could reduce real complex permittivity and increase imaginary complex permittivity of the composite material. It was able to enhance the ability of attenuating electromagnetic wave, improve absorbing properties, and meanwhile do not destroy the impedance matching characteristic with air.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1128-1131
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1128
• Online since: June 2012
• Authors: Chao Wu, Zhao Yang Zeng, Xu Liang Lü, Q. Jia, H.C. Tang
• Keywords: Absorbing Materials, Effective Electromagnetic Parameter, Magnetism-Absorbing Agents, Semiconductor Particulates

References

[1] C. Wang, J.L. Gu, F.Y. Kang, Resarch in theoretical designs of microwave absorbing materials, materials review. 23 (2009) 5-8.

[2] K. Lakshmi, H. John, K.T. Mathew, Microwave absorption, reflection and EMI shielding of PU-PANI composite, Acta Mater. 57 (2009) 371-375.

DOI: 10.1016/j.actamat.2008.09.018

[3] Y. Nie, H.H. He, R.Z. Gong, The electromagnetic characteristics and design of mechanically alloyed Fe-Co particles for electromagnetic-wave absorber, J. Magn. Magn. Mater. 310 (2007) 13-16.

DOI: 10.1016/j.jmmm.2006.07.021

[4] S.J. Ding, D.B. Ge, N. Shen, Numerical simulation of equivalent electromagnetic parameters of composite material, Acta Phys. Sin. 59 (2010) 943-948.

[5] J. Li, J.K. Kim, Percolation threshold of conducting polymer composites containing 3D randomly distributed graphite nanoplatelets, Compos. Sci. Technol. 67 (2007) 2114-2120.

DOI: 10.1016/j.compscitech.2006.11.010

[6] P.S. Neelakanta, Complex permittivity of a conductor-loaded dielectric, J. Phys.: Condens. Matter. 2 (1990) 4935-4947.

DOI: 10.1088/0953-8984/2/22/014

[7] K. Chao, Y.L. Liu, R.G. Yang, Combination of ant colony algorithm and microgenetic algorithm for multilayered radar absorbing coatings optimization, Journal of Functional Materials. 39 (2008) 1052-1055.

DOI: 10.1109/icmmt.2008.4540464

[8] H.L. Su, Preparation of (Ni，Zn，Co)2-W composite Ba-Ferrite and its microwave-absorbing properties, Materials Science and Engineering. 20 (2002) 568-571.