Shielding Performance of Materials Under the Excitation of High-Intensity Transient Electromagnetic Pulse

Zhiyang Yan,Jinliang Cai,Feng Qin,Jiangchuan Lin,Shouhong Zhong

doi:10.1109/access.2021.3069328

Zhiyang Yan, Jinliang Cai + Show 3 more

Open Access

https://doi.org/10.1109/access.2021.3069328

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Journal: IEEE Access	Publication Date: Jan 1, 2021
Citations: 13	License type: CC BY 4.0

Affiliation: China Academy of Engineering Physics

Abstract

Shielding effectiveness (SE) dominates the shielding performance of materials. Under the excitation of high-intensity transient electromagnetic pulse, especially the wide-band transient electromagnetic pulse, how to characterize and calculate the SE of shielding materials is not clear. In order to reveal the shielding performance of materials towards the wide-band transient electromagnetic pulse, a systematic experimental investigation was performed on a home-made SE measurement system. The ‘peak value reduction ( $SE_{\mathrm {PR}}$ )’ is verified to be an effective approach for the characterization of SE of shielding materials. The SE of the employed materials shows no noticeable change even with the excitation field intensity increasing to 200 kV/m, which is significantly different from that of high-power microwave (HPM). Under the excitation of HPM, the SE of materials starts to increase at a field intensity of 19.4 kV/m and becomes saturated at 33.6 kV/m. Further analysis discloses that the variation of SE of materials is mainly dependent on two factors, one is the intrinsic property of the material itself, and the other is energy density spectrum of the excitation high-intensity transient electromagnetic pulse. The energy in per frequency unit (10 MHz) for wide-band transient electromagnetic pulse is far lower than that of HPM, resulting in an evident dissimilarity in the changes of SEs of shielding materials.

Highlights

In the past few years, great concern has been paid to the threat brought by high-intensity transient electromagnetic pulse, against the normal working of facilities such as electronic systems, networks, grids and communications [1]–[4], especially with the rapid development of pulsed power science and high-power microwave (HPM) technology [5]–[10]
Under the excitation of high-intensity transient electromagnetic pulse, how to characterize the shielding effectiveness (SE) of shielding materials, and whether the shielding performance will be affected by the parameters such as field intensity, repetition frequency and pulse width are very critical for practical applications
Further analysis reveals that the variation of SE of materials is mainly dependent on two factors, one is the intrinsic property of the material itself, and the other is energy density spectrum of high-intensity transient electromagnetic pulse

Summary

Introduction

In the past few years, great concern has been paid to the threat brought by high-intensity transient electromagnetic pulse, against the normal working of facilities such as electronic systems, networks, grids and communications [1]–[4], especially with the rapid development of pulsed power science and high-power microwave (HPM) technology [5]–[10]. Improving the survivability of facilities through taking protection and reinforcement measure is crucial for their normal use. Electromagnetic shielding materials, such as carbon-based materials, transition metal oxides/dichalcogenids, silicon carbides and polymer-based composites, which can isolate the sensitive equipment from the electromagnetic radiation in space, have attracted interest of researchers in the field of electromagnetic compatibility, and show great potential in the reinforcement application against high-intensity. Under the excitation of high-intensity transient electromagnetic pulse, how to characterize the shielding effectiveness (SE) of shielding materials, and whether the shielding performance will be affected by the parameters such as field intensity, repetition frequency and pulse width are very critical for practical applications.

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Conclusion