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Shielding effectiveness measurements and uncertainty estimationfor textiles by a VNA-based free space transmission method

Published online by Cambridge University Press:  07 November 2013

S.M. Patel ,
K. Patel ,
P.S. Negi  and
V.N. Ojha
S.M. Patel*
Affiliation:
Quantum Phenomenon and Applications, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi-12, India
K. Patel
Affiliation:
Silicon Thin Film Solar Cells, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi-12, India
P.S. Negi
Affiliation:
Electrical Standards, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi-12, India
V.N. Ojha
Affiliation:
Quantum Phenomenon and Applications, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi-12, India
*
⋆ Correspondence:[email protected]
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Abstract

A free-space transmission method has been used for reliable shielding effectivenessmeasurement of the easily available textile materials. Textiles with three different yarndensities were studied for their shielding effectiveness with the help of a vector networkanalyzer and laboratory calibrated two X-band horn antennas. The expressions ofuncertainty estimation have been derived in accordance with the present free-spacemeasurement setup for the calculated SE values. The measurements have shown that anelectromagnetic energy can be maximum shielded up to 16.24 dB with measurement uncertaintyless than 0.21 dB in 8.2 to 12.4 GHz range by a 160.85 μm textile. Thus,a thin textile with a high density can have higher shielding and this property mainlydepends on its intrinsic structure, frequency range and thickness. This study promises thepotential applications of such materials as a very cost effective shielding material atmicrowave frequencies with some modifications.

Keywords

Shielding propertymeasurement uncertaintyfree-space transmission methodVNAS-parameter
Type
Research Article
Information
International Journal of Metrology and Quality Engineering , Volume 4 , Issue 2 , 2013 , pp. 109 - 115
Copyright
© EDP Sciences 2013

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References

C.R. Paul, Introduction to Electromagnetic Compatibility (Wiley Interscience, 2006)
Stuchly, M.A., Electromagnetic fields and health, IEEE Potentials 12, 34–39 (1993) CrossRefGoogle Scholar
Habash, R.W., Electromagnetic – the uncertain health risks, IEEE Potentials 22, 23–26 (2003) CrossRefGoogle Scholar
NIEHS Report on Health Effects from Exposure to Power-line Frequency Electric and Magnetic Fields, National Institute of Health, NC 27709, NIEHS (1999)
Więckowski, Tadeusz W., Jarosław, Janukiewicz M., Methods for evaluating the shielding effectiveness of textiles, Fibres Textiles Eastern Europe 14, 18–22 (2006) Google Scholar
L.O. Hoeft, E.W. Tokarsky, Measured electromagnetic shielding characteristics of fabric made from Metal Clad Aramid Yarn and Wire, in Proceedings of IEEE International Symposium in EMC, Washington DC, USA, 2000, Vol. 2, pp. 883–886
Anantharaman, M.R., Sindhu, S., Jagatheesan, S., Malini, K.A., Kurian, P., Dielectric properties of rubber ferrite composites containing mixed ferrites, J. Phys. D 32, 1801–1810 (1999) CrossRefGoogle Scholar
Guan, Hongtao, Liu, Shunhua, Duan, Yuping, Cheng, Ji, Cement based eletromagnetic shielding and absorbing building materials, Cem. Conc. Comp. 28, 468–474 (2006) CrossRefGoogle Scholar
Cheng, K.B., Ramakrishna, S., Lee, K.C., Electromagnetic shielding effectiveness of copper/glass fiber knitted fabric reinforced polypropylene composites, Composites: Part A 31, 1039–1045 (2000) CrossRefGoogle Scholar
Sudha, J.D., Sivakala, S., Patel, K., Nair, P. Radhakrishnan, Development of electromagnetic shielding materials from the conductive blends of polystyrene polyaniline-clay nanocomposite, Composites: Part A 41, 1647–1652 (2010) CrossRefGoogle Scholar
Sachdev, V.K., Patel, K., Bhattacharya, S., Tandon, R.P., Electromagnetic interference shielding of graphite/acrylonitrile butadiene styrene composites, J. Appl. Polymer Sci. 120, 1100–1105 (2011) CrossRefGoogle Scholar
Bal, K., Kothari, V.K., Measurement of dielectric properties of textile materials and their applications, Indian J. Fibre Text. Res. 34, 191–199 (2009) Google Scholar
Colaneri, N.F., Shacklette, L.W., EMI shielding measurements of conductive polymer blends, IEEE Trans. Inst. Meas. 41, 291–297 (1992) CrossRefGoogle Scholar
S.M. Shajedul Hasan, Madhan Sundaram, Yoon Kang, Mostofa K. Howlader, Measurement of dielectric properties of materials using the transmission/reflection method with material filled transmission line, in Proceedings of IMTC 2005 – Instrumentation and Measurement Technology Conference, Ottawa, Canada, 2005, pp. 17–19
Ghodgaonkar, D.K., Varadan, V.V., Varadan, V.K., Free-space measurement of complex permittivity and complex permeability of magnetic materials at microwave frequencies, IEEE Trans. Inst. Meas. 39, 387–394 (1990) CrossRefGoogle Scholar
ASTM - D4935, Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials (1999)
ISO/IEC 17025: 2005, General requirements for the competence of testing and calibration laboratories (2005)
ISO/IEC Guide 98:1995, Guide to the expression of uncertainty in measurement (GUM, 1995)
Patel, K., Patel, S.M., Negi, P.S., Performance of VNA based free-space method for the complete dielectric property characterization, Invertis J. Sci. Technol. 5, 33–39 (2012) Google Scholar
S.M. Patel, K. Patel, P.S. Negi, V.N. Ojha, Characterization of different types of materials for their shielding effectiveness, in Proceedings of National Conference on Emerging Technologies and Applications, Jaipur, India, 2010
Brzeziński, S., Rybicki, T., Malinowska, G., Karbownik, I., Rybicki, E., Lech Szugajew, Effectiveness of Shielding Electromagnetic Radiation, and Assumptions for Designing the Multi-layer Structures of Textile Shielding Materials, Fibres Textiles Eastern Europe 17, 60–65 (2009) Google Scholar
Kazani, I., De Mey, G., Hertleer, C., Banaszczyk, J., Schwarz, A., Guxho, G., Van Langenhove, L., Van Der Pauw method for measuring resistivities of anisotropic layers printed on textile syubstrates, Text. Res. J. 81, 2117–2124 (2011) CrossRefGoogle Scholar
Patel, K., Negi, P.S., Estimation of Complex and Linear Uncertainties in S-Parameter Measurements for Metrology Applications, Int. J. Electromagn. Appl. 2, 85–104 (2012) Google Scholar