In order to accurately analyze the time-domain shielding effectiveness (TDSE) of metallic enclosures, a discontinuous Galerkin time domain (DGTD) method based on the local time-stepping (LTS) technique and parallel technique is proposed.

The full wave electromagnetic simulation of metallic enclosures is carried out by the DGTD method, and the TDSE is then calculated. LTS technology is used to increase the time step size, combined with parallel technology to greatly shorten the computing time. The influence of design parameters such as aperture size, enclosure thickness and array hole spacing on TDSE is then analyzed.

The numerical results show that the proposed method is correct and effective.

The proposed method provides an effective tool for the simulation of electromagnetic shielding problems, and has certain guiding significance for the design of metallic enclosures.