Analysis of EMC issues in the absence of a metal enclosure

The absence of a metal structure complicates the situation for electronic equipment. In fact, new couplings appear as soon as the housing is made of non-metallized composite.

Equipment housed in an electromagnetic-tight metal enclosure sees its spectrum split in two when subjected to electric field aggression. At the lower end of the frequency range (between a few MHz and a few hundred MHz), it is the wiring that is affected. In the higher frequency ranges, it's the possible effects of cracks that appear. A properly treated housing with baffle or knife-edge effects on the housing, or the use of conductive gaskets, provides a good seal against short-wave electromagnetic waves.

In composite housings, i.e. in the absence of shielding, all parts of the electronics can be attacked individually.

A ribbon, an incorrectly...