Shielding Effectiveness Simulation of Rectangular Enclosures Using FIT

In order to deal with the problem that electronic device can be affected by electromagnetic interference from external environment, this paper studied the influence of the proposed rectangular metallic enclosures to achieve effective electromagnetic shielding based on finite-integration technique. A three-dimensional simulation model of a rectangular shielding enclosure was directly established with the plane wave of timebased Gaussian pulse excitation, which was utilized to establish electromagnetic radiation intensity. The electromagnetic shielding effectiveness was simulated both in frequency domains and in time domains, with different apertures numbers on front of rectangular enclosure. The thickness parameter was further investigated, which is essential to increase the operating stability of electronic system. It needed to have high capability in anti-electromagnetic interference to ensure the efficient transmission of weak signals.