Analytical method for electromagnetic coupling to a penetrated transmission line in cascaded multiple enclosures with hybrid apertures

Abstract

An efficient analytical model has been developed for predicting the electromagnetic (EM) field coupling to a lossless transmission line (TL) penetrating through cascaded multiple rectangular enclosure with hybrid apertures (apertures with and without conductive sheets coexist) excited by an external plane wave of oblique incidence. First, The EM field in the enclosure through apertures covered by conductive sheets is derived using the dyadic Green’s function and the transfer impedance of the sheet. Then, the EM field in the enclosure through apertures without sheets is derived based on the Bethe’s small holes theory and the mirror procedure. Finally, the electric current induced at the TL terminals is obtained combining the equivalent lumped-pi circuit model of the TL and the Agrawal’s model. The analytical model has been successfully verified by the finite-difference time-domain (FDTD) method over the frequency range of 0.1 ~ 3 GHz, which consumes less time than numerical methods.

KEYWORDS:

• Field-to-line coupling
• penetrated transmission line (TL)
• cascaded multiple enclosures
• aperture coupling
• conductive sheet

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 61372050]; the Fundamental Research Funds for the Central Universities [grant number 2018QN013].

Notes on contributors

Luhang Jiang

Luhang Jiang was born in Jilin, China, in 1991. She received the B.S. degree in electrical engineering and automation from Hunan University, Changsha, China, in 2014. She is currently working toward the Ph.D. degree in electrical engineering in North China Electric Power University, Beijing, China. Her main research interests include electromagnetic simulation, EMC/EMI in shielding enclosures.

Jianhong Hao

Jianhong Hao was born in Hebei, China, in 1960. She received the Ph.D. degree in plasma specialty from the Chinese Academy of Engineering Physics, in 2003. She is currently a Professor, a Doctoral Supervisor, and the Director of the Institute of Modern Electronic Technology, North China Electric Power University. Her main research interests include the fields of high-power microwave, beam-beam interaction of strong radiation.

Yanfei Gong

Yanfei Gong was born in Shandong, China, in 1987. He received the M.S. degree in circuit and system from North China Electric Power University, Beijing, China, in 2016, where he is currently working toward the Ph.D. degree in electrical engineering. His main research interests include electromagnetic pulse (EMP) interaction with transmission lines, electromagnetic shielding.