An efficient method for predicting the shielding effectiveness of an enclosure with multiple apertures

ABSTRACT

An efficient analytical method has been proposed for predicting the shielding effectiveness (SE) and resonances of a metallic enclosure with multiple apertures against an external incident plane wave. First, the electromagnetic (EM) field distribution within the enclosure through multiple apertures is represented by the equivalent electric and magnetic dipole moments based on the Bethe’s theory for small aperture coupling. Then, the EM fields in the enclosure can be obtained by using the scalar wave functions, where the unknown coefficients in the functions are related to the equivalent dipole moments. Finally, the analytical method is applied to handle the enclosure with multiple apertures, and corresponding inclusions about the SE and resonances can be obtained. Compared with the full-wave simulation software CST over the frequency range of 0–2.5 GHz, the analytical method is proved to be accurate and effective, which consumes less time than the conventional numerical methods.

KEYWORDS:

• Shielding effectiveness (SE)
• metallic enclosure
• multiple apertures
• Bethe’s theory for small aperture coupling
• scalar wave functions

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Research Funds of Beijing Information Science and Technology University [grant number 2025022].

Notes on contributors

Yanfei Gong

Yanfei Gong was born in Shandong, China, in 1987. He received the Ph.D. degree in electrical engineering from North China Electric Power University, Beijing, China, in 2019, where he is currently a Lecturer with the School of Information and Communication Engineering, Beijing Information Science and Technology University. His main research interests include electromagnetic pulse (EMP) interaction with transmission lines, electromagnetic shielding.

Bo Wang

Bo Wang was born in Shanxi, China, in 1975. He received the M.S. degree in electrical engineering from Chongqing University, Chongqing, China, where he is currently working toward the Ph.D. degree in electrical engineering at Wuhan University, Wuhan, China. He is also an engineer with Ningxia Electric Power Research Institute, Yinchuan, China. His main research interest includes the modeling and simulation of power transmission and transformation equipment.