A Study on the Magnetic Shielding Effectiveness of Conductive Sheets for Protecting ICT Facilities and Devices

Electromagnetic pulse (EMP) is a serious threat for information and communication technologies (ICT) in military or civilian applications. In ICT system, EMP can result in physical destruction of hardware and data errors. Since conductive sheets for EMP protection have been developed recently, it is necessary to verify the shielding effectiveness (SE) of the materials. This paper analyzes the low-frequency (10 kHz - 10 MHz) magnetic SE measurement results of conductive sheets. There are two SE measurement methods. One is an aperture method to measure material's SE, and the other is a final performance measurement method that use facility with conductive sheet. The aperture measurement environment is analyzed through analytic calculation and SE measurement of the aperture according to its sizes. Based on this, the magnetic SE of the conductive sheet bound to the aperture of several sizes is measured. In order to verify the aperture measurement environment, a test facility made of conductive sheet is constructed, and the two measurement results are compared.