Shielding
This chapter looks at that classic of EMC design, the shielded enclosure. It is only too easy to say “the product’s in a metal box, it must be shielded, that’ll do”. In fact there is much more to designing a shielded product than simply putting it in a metal box. This section explores the theory of ideal shields and the limits that this theory encounters when you look at the performance of real shields, and then the practical design measures that can be taken to deal with these limitations.
15.1 Shielding theory
Shielding and filtering are complementary practices. There is little point in applying good filtering and circuit design practice to guard against conducted coupling if there is no return path for the filtered currents ...
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