Shielding effectiveness of PCB loaded rectangular enclosure with circular-aperture array

With the purpose of evaluating the ability for a metallic rectangular enclosure with an array of circular apertures and a printed circuit board(PCB) against the external electromagnetic interference, a waveguide equivalent circuit model was established, the analytical formulation of shielding effectiveness(SE) was derived from the equivalent circuit, and a simple and high-effective approach was proposed. In the case of the enclosure without PCB, the approach is identified with that in the reference. With respect to the SE of the PCB loaded enclosure, the calculated results using the present approach are in well agreement with those obtained by commercially available numerical tool CST. The results show that the comparison between electric field orientations parallel and perpendicular to th