Abstract

In this paper, low-frequency time-harmonic magnetic shielding generated by a multilayer metal plate against a co-axially placed toroidal coil is investigated. First, a MATLAB program is written based on the integral equations of the ring-to-ring and ring-to-axis electromagnetic shielding effectiveness, and the validity of the calculated results is verified by finite element simulations as well as experimental data. Secondly, the effect of changing the metal plate spacing and the number of layering on the magnetic shielding effectiveness when the total thickness of the metal plate is certain is analyzed with emphasis. The results show that the magnetic shielding effectiveness when the metal plate is divided into two equal layers and kept at a certain interval is even better than the shielding effectiveness of a single-layer metal plate with a thickness five times the original total thickness. In addition, the shielding effectiveness can be improved by nearly 30 dB by increasing the number of layers of the sheet with a fixed total sheet thickness.

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