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Shielding effectiveness measurements and uncertainty estimation for 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 effectiveness measurement of the easily available textile materials. Textiles with three different yarn densities were studied for their shielding effectiveness with the help of a vector network analyzer and laboratory calibrated two X-band horn antennas. The expressions of uncertainty estimation have been derived in accordance with the present free-space measurement setup for the calculated SE values. The measurements have shown that an electromagnetic energy can be maximum shielded up to 16.24 dB with measurement uncertainty less 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 mainly depends on its intrinsic structure, frequency range and thickness. This study promises the potential applications of such materials as a very cost effective shielding material at microwave 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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