As with most simple concepts, practical EMC shielding requires considerable engineering skill to give good results. However at product enclosure level, it can be complex and expensive, adding to both material and assembly cost. Added to that affective enclosure shielding usually requires substantial filtering of all cables which pass out of the product, right at the point where they penetrate the enclosure shield. Tackling an EMC solution cost effectively and conclusively, shielding at PCB level is simple and low cost. Board level shielding solutions can be used to achieve an EMC performance that would be far more difficult and costly at product enclosure level. At board level, small shielding cans can be applied selectively to the problem areas of a circuit, directly tackling componets with emissions that are too high ir too sensitive. In effect, PCB shielding cans are simple metal boxes taht are easily soldered in pace,much like any othe board level component. Tackling EMC problems at this level, keeps component and assembly low and appearance and ease of maintenance of the product are not compromised.
