In this contribution we evaluate a fast simulation technique to calculate and to characterise the shielding efficiency of rectangular enclosures with apertures. The technique is based on a mode expansion technique developed by Mendez in theseventies. The solutions are obtained under a double summation form, achieving an important computational advantage. We compare results of this fast approximative technique with reliable results obtained with a full-wave electromagnetic simulator. It will be shown that the mode expansion technique is a far better CAD-tool to evaluate the shielding efficiency of metallic enclosures than existing simple design rules.
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