Shielding of a Box with a Slot

Let us calculate the shielding effectiveness of a PEC box with a slot, excited with a plane wave incident in the direction perpendicular to the slot.
A rectangular metal enclosure with an aperture on one face can be modeled as a waveguide, shorted at the far end, with the aperture at the entrance to the waveguide. The model is quickly created with just a few plates in WIPL-D Pro (Fig. 1).
The electric field shielding effectiveness is calculated as the ratio of the impinging field to the field measured at some point within the waveguide, distant from the slot...
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Various Examples

Electromagnetic (EM) environment is an integral part of the world in which we live. Many systems (radio, TV broadcasting stations, radars…) radiate EM energy during their common operation modes. The EM environment created by these intentional and unintentional sources, when sufficiently strong, interferes with the operation of many electrical and electronics equipment. During the past few decades electrical and electronics engineering have rapidly advanced so EM noise has increased but the techniques to solve the problems caused by EM noise have improved... read more