Abstract
An electromagnetic pulse (EMP) with high energy can damage electronic equipment instantly within a wide range of thousands of kilometers. Generally, a metal plate placed inside a thick concrete wall is used against an EMP, but it is not suitable for an EMP shielding window, which requires not only strong shielding effectiveness (SE) but also optical transparency (OT). In this paper, we propose a very thin and optically transparent structure with excellent SE for EMP shielding window application. The proposed structure consists of a saltwater layer held between two glass substrates and two metal mesh layers on the outside of the glass, with a total thickness of less than 1.5 cm. The SE and OT of the structure are above 80 dB and 45%, respectively, which not only meet the requirement of EMP shielding for military purposes but also retain the procedure of good observation. Moreover, the OT of the structure can be significantly improved using only one metal mesh film (MMF) layer, while the SE is still maintained high to satisfy the required SE for home applicants. With the major advantages of low cost, optical transparency, strong SE, and flexible performance, the proposed structure can be considered a good solution for transparent EMP shielding windows.
Highlights
An electromagnetic pulse (EMP) with high energy can damage electronic equipment instantly within a wide range of thousands of kilometers
The proposed structure consists of a saltwater layer held between two clear glass layers
One or two metal mesh film layers are taped on the outer side of the glasses to enhance the shielding performance of the structure
Summary
An electromagnetic pulse (EMP) with high energy can damage electronic equipment instantly within a wide range of thousands of kilometers. A metal plate placed inside a thick concrete wall is used against an EMP, but it is not suitable for an EMP shielding window, which requires strong shielding effectiveness (SE) and optical transparency (OT). Transparent electrodes (TEs), such as indium tin oxide (ITO)8, graphene[9], carbon nanotubes (CNTs)[10], metallic nanowires (MNWs)[11], and metal mesh film (MMF)[8,12], have been studied because of their favorable OT and thin-film structure These TEs show a low shielding performance compared with the requirement of EMP applications. This research proposes a transparent EMP shielding solution replacing conventional methods using a metal plate or a concrete wall. It is expected to reduce much of the construction costs for EMP-shielded rooms
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