The effects of apertures' shape and configuration on the shielding effectiveness of metallic enclosures

The effects of apertures' shape and configuration on the shielding effectiveness and resonant frequencies of metallic enclosures is studied using finite-difference time-domain (FDTD) method. It's shown that for a fixed open area the shielding factor is significantly dependent on the shape of the aperture. Furthermore, it's shown that dividing a specified open area into a combination of multiple apertures may improve the shielding effectiveness. This could be used in designing ventilation systems or optimizing the configuration of apertures installed for entering feeding cables.