Current shielding effectiveness (SE) of electromagnetic shielding (EMS) fabric is tested in the plane state, the testing results are difficult to describe the shielding effect of a garment in a curve surface state after manufactured by the fabric. To solve this problem, this study proposes a new SE computation model of the EMS fabric based on a SE vector. The model can calculate a theoretical SE value of the EMS fabric in the curve surface state. A number of factors which determine the SE of the fabric with a curve surface are analyzed according to the principle of the reflection and transmission of the electromagnetic wave. This study also gives a new argument that the curve fabric can be divided into many micro-planes and the fabric SE is considered as a vector. And then a computation model of the SE of the curve fabric is constructed. The detail of computation is deduced, and an application example is given. Results of experiments and analyses show that the method is scientific and correct, and the error between the computation SE value and the testing SE value of the local garment is less than 3%. The model provides a new way to calculate the SE of the EMS fabric with symmetric curved surface.
Ming Li Jiao,
"Computation Model of Shielding Effectiveness of Symmetric Partial for Anti-Electromagnetic Radiation Garment," Progress In Electromagnetics Research B,
Vol. 47, 19-35, 2013. doi:10.2528/PIERB12111102
1. Wang, J. and Z. Xi, "Research progress of electromagnetic shielding material of metal fiber," Rare Metal Materials and Engineering, Vol. 40, 1688-1692, 2011.
2. Sun, R. J., K. Lai, and J. C. Zhang, "Suggestion on the test for electromagnetic shielding in the fabric for costume," Journal of Xian University of Engineering Science and Technology, Vol. 17, No. 2, 100-103, 2003.
3. Schmid, E., W. Panzer, H. Schlattl, and H. Eder, "Emission of fluorescent x-radiation from non-lead based shielding materials of protective clothing: A radiobiological problem?," Journal of Radiological Protection, Vol. 32, No. 3, 29-39, 2012. doi:10.1088/0952-4746/32/3/N129
4. Zhu, X. Y., X. J. Li, and B. K. Sun, "Study on electromagnetic shielding efficacy of knitting clothing," Przeglad Elektrotechniczny, Vol. 88, No. 3B, 42-43, 2012.
5. Kurokawa, S. and T. Sato, "A design scheme for electromagnetic shielding clothes via numerical computation and time domain measurements," IEICE Transactions on Electronics, Vol. E86C, No. 11, 2216-223, 2003.
6. Yoshimura, Y., I. Nagano, S. Yagitani, T. Ueno, and T. Nakayabu, "FDTD analysis of effectiveness of shielding clothes in suppressing electromagnetic field in phantom model ," Transactions of the Institute of Electrical Engineers of Japan, Vol. 123, No. 7, 623-629, 2003.
7. Wang, X. C. and Z. Liu, "Shielding efficiency mathematics model on the electromagnetic shielding clothing," Journal of Textile Research, Vol. 29, 73-75, 2008.
8. Li, R., L. Zhang, and L. Jia, "Influence of fabric structural model on shielding effectiveness of electromagnetic radiation shielding fabric," Int. J. Modeling, Identification and Control, Vol. 11, No. 3-4, 211-217, 2010. doi:10.1504/IJMIC.2010.037032
9. Jayasree, P. V. Y., V. S. S. N. S. Baba, B. Prabhakar Rao, and P. Lakshman, "Analysis of shielding effectiveness of single, double and laminated shields for oblique incidence of em waves," Progress In Electromagnetics Research B, Vol. 22, 187-202, 2010. doi:10.2528/PIERB10051305
10. Hakansson, E., A. Amie, and A. Kaynak, "Dielectric characterization of conducting textiles using free space transmission measurements: Accuracy and methods for improvement," Synthetic Metals, Vol. 157, 1054-1063, 2007. doi:10.1016/j.synthmet.2007.11.001
11. Ortlek, H. G., O. G. Saracoglu, O. Saritas, and S. Bilgin, "Electromagnetic shielding characteristics of woven fabrics made of hybrid yarns containing metal wire ," Fibers and Polymers, Vol. 13, No. 1, 63-67, 2012. doi:10.1007/s12221-012-0063-6
12. Wang, X. C. and Z. Liu, "A new computation of shielding effectiveness of electromagnetic radiation shielding fabric," Progress In Electromagnetics Research Letters,, Vol. 33, 177-186, 2012.
13. Osman, M. A. R., M. K. A. Rahim, N. A. Samsuri, H. A. M. Salim, and M. F. Ali, "Embroidered fully textile wearable antenna for medical monitoring applications," Progress In Electromagnetics Research, Vol. 117, 321-337, 2011.
14. Ching, I. S. and T. C. Jin, "Effect of stainless steel-containing fabrics on electromagnetic shielding effectiveness," Textile Res. J., Vol. 74, No. 1, 51-54, 2004. doi:10.1177/004051750407400109
15. Liu, Z. and X. C. Wang, "Influence of fabric weave type on the effectiveness of electromagnetic shielding woven fabric," Journal of Electromagnetic Waves and Applications, Vol. 26, No. 14-15, 1848-1856, 2012. doi:10.1080/09205071.2012.717352
16. Raj, C. D., G. S. Rao, P. V. Y. Jayasree, B. Srinu, and P. Lakshman, "Estimation of reflectivity and shielding effectiveness of three layered laminate electromagnetic shield at X-band," Progress In Electromagnetics Research B, Vol. 20, 205-223, 2010. doi:10.2528/PIERB10030402
17. Mao, Y., B. Chen, H. Q. Liu, J. L. Xia, and J.-Z. Tang, "A hybrid implicit-explicit spectral FDTD scheme for oblique incidence problems on periodic structures," Progress In Electromagnetics Research, Vol. 128, 153-170, 2012.
18. Wu, G., X. Zhang, Z. Q. Song, and B. Liu, "Analysis on shielding performance of metallic rectangular cascaded enclosure with apertures," Progress In Electromagnetics Research Letters, Vol. 20, 185-195, 2011.
19. Zhao, Y., F. Chen, H. Chen, N. Li, Q. Shen, and L. Zhang, "The microstructure design optimization of negative index metamaterials using genetic algorithm ," Progress In Electromagnetics Research Letters, Vol. 22, 95-108, 2011.
20. Qian, Z. and Z. J. Chen, Electromagnetic Compatibility Design and Interference Suppression Technology, Zhejiang University Press, Hangzhou, 2000.