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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:patelsm@mail.nplindia.org
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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

Information

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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