Shielding Effectiveness of a Metallic Perforated Enclosure by Mesh-Free Method

In this paper, an efficient mesh-free method (MFM) is introduced to evaluate the shielding effectiveness of a metallic enclosure with aperture. To this end, equivalent magnetic current densities and their relative electrical vector potentials are assumed on both sides of the aperture. Magnetic current of each side is related to its vector potential, using an integrating operator including proper Green's functions. Then, the electromagnetic field at each side is obtained by a differential operation on its respective electrical vector potential. Enforcing the continuity of the tangential magnetic and electric fields on the aperture leads to two decoupled differential and integral equations that are solved together by using proper shaping functions for the assumed magnetic currents and electrical vector potentials at the defined nodes. The proposed method is validated by the commercial software FEKO and measurements. In addition, it is shown that the proposed MFM is very efficient compared to two similarly formulated efficient method-of-moments-based methods.