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No.4(pp.115-181)

Home > Issues > Volume 13 (2008) > No.4(pp.115-181)

Magnetic Shielding Effectiveness Measurement of Magnetic Steel Sheets in ELF Range

Journal of Magnetics, Volume 13, Number 4, 31 Dec 2008, Pages 173-176

Kyo-Heum Yeon(Department of Physics, Hannam University), Derac Son*

(Department of Physics, Hannam University), Eon-Byeong Park(Environment Research Center, RIST), Jae-Young Lee(Environment Research Center, RIST), Kyung-Hwan Do(Cold Rolled Product Technology Team, POSCO Center), Jae-Seg Park(Cold Rolled Product Technology Team, POSCO Center)

Abstract

In this study, a new kind of instrument for measuring the magnetic shielding effectiveness (MSE) was developed using a double yoke; one a magnetizing yoke and the other a sensing yoke. Using the developed instrument, the MSE could be measured for a steel sheet specimen in the ELF range, where the magnetic permeability contributes to the MSE at low frequencies and eddy currents contributes to the MSE high frequencies with < 0.1 dB reproducibility. The developed measuring method can be applied to quality control in a steel sheet company producing EMI/EMC shielding materials.

Keywords: magnetic field shield; magnetic shielding effectiveness; EMI/EMC; double yoke; magnetic shielding factor

DOI: 10.4283/JMAG.2008.13.4.173

Full Text: PDF

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