An analytical model for predicting the shielding effectiveness and resonances of a lossy enclosure with apertures

Abstract

In this paper, an improved analytical model is presented to predict the shielding effectiveness (SE) and resonances of an apertured enclosure composed of the material of finite conductivity. In the model, the modified parameters of the rectangular waveguide are introduced to deal with the lossy enclosure with apertures, which can consider the effects of wall loss on the SE. Firstly, according to the circuit theory and electromagnetic topology (EMT) theory, the lossy enclosure is modeled as the circuit model and signal flow graph, respectively. Then, the electric field components at the monitor point can be obtained; hence, the SE can be predicted accurately. Finally, the presented model is utilized to analyze the effects of various parameters and conditions on the SE. The validity of the presented model is verified by the CST through several cases, showing that the lossy enclosure is feasible to damp all the resonant modes.

KEYWORDS:

• Shielding effectiveness (SE)
• finite conductivity
• rectangular waveguide
• lossy enclosure
• electromagnetic topology (EMT) theory

Disclosure statement

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

Additional information

Funding

This work was supported by the Foundation the National Natural Science Foundation of China [grant number 62074017].

Notes on contributors

Yanfei Gong

Yanfei Gong was born in Shandong, China, in 1987. He received a 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.

Xingtong Chen

Xingtong Chen was born in Jilin, China, in 1993. She received the B.S. degree in electrical engineering from North China Electric Power University, Baoding, China, in 2016, and the M.S. degree in electronic science and technology from North China Electric Power University, Beijing, China, in 2019. She is currently an engineer with the State Grid Energy Research Institute, Beijing, China. Her main research interests include the Internet of energy, power electronic technology and power system modeling.