Box with Slot Shielding Effectiveness

The aim of this application note is to calculate the shielding effectiveness of a PEC box with a slot, excited with a plane wave incident in the direction perpendicular to the slot. The electric field shielding effectiveness is calculated as the ratio of the impinging field to the field measured at certain point within the waveguide, distant from the slot.

The theory assumes that a single TE10 waveguide mode propagates from the aperture and normal to it. Higher order modes, and modes propagating in other directions may exist which will complicate the results, and introduce need for EM simulation in order to predict the shielding effectiveness.

The results of EM simulation are in excellent agreement with results obtained by using intermediate level simulation tools from University of York, and easily obtainable by using their online calculator. The objective is to investigate the influence of changes in box and slot geometry as well as in position inside the box. in that sense, all parameters are fixed and single geometry variable or field position is then varied as a series of tests.

Section: EMC

For full version of the document, please check the following pdf.