Arrangement for preventing electromagnetic interference

An arrangement for preventing electromagnetic interference in electronic apparatus, the arrangement comprising:

• (a) a printed circuit board including two types of zones:
• a first type of zone having sources of high frequency energy, said first type of zone located within an electrically conductive enveloping enclosure designed to inhibit or attenuate direct electromagnetic radiation, and
• a second type of zone which is electrically connected to the first type of zone via conductors, and not contained within a same enclosure or part of an enclosure containing the first type of zone, said second type of zone enabling connection to other devices,
• (b) filter means incorporated on the printed circuit board, for removing or attenuating unwanted high-frequency energy from the conductors for interconnecting the first type of zone and second type of zone, and
• (c) a high frequency electrical connection between the filter means and the enclosure, arranged at a boundary or boundaries of the first type of zone and second type of zone of the printed circuit board, said high frequency electrical connection including conductive zones positioned above and below opposed regions of the printed circuit board at a boundary between the first type of zone and second type of zone, said conductive zones electrically interconnected to one another by means of transverse conducting elements through said printed circuit board.