A multiple layer printed circuit board

H - Electricity – 05 – K

Patent

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Details

H05K 1/02 (2006.01) H05K 3/40 (2006.01) H05K 3/46 (2006.01) H05K 9/00 (2006.01) H05K 3/00 (2006.01) H05K 3/42 (2006.01)

Patent

CA 2142611

A multiple layer printed circuit board (60) and a method of manufacturing multiple layer printed circuit boards (60) which incorporate integral edge shielding in combination with top and bottom shielding to effectively provide a sandwich arrangement within a Faraday Cage. Electromagnetic emissions radiating from an outside surface of either the top or bottom shielding layer are substantially reduced. In one structure, a multiple layer printed circuit board having a sandwich arrangement which includes at least one inner conductive layer (70) for providing a ground plane disposed between the outer shielding layers, the inner conductive layer (70) being electrically connected directly to the edge shielding means and hence to the outer conductive layers (20, 22). The larger and more continuous surface area provided by the direct connection to the edge shielding effectively provides an electrical connection having a low inductance and hence in operation results in all ground planes having a more constant non-varying potential.

Carte de circuits imprimés à couches multiples (60) et méthode de fabrication de ces cartes (60), avec blindage intégré des bords associé au blindage du dessus et du dessous afin d'assurer efficacement un montage en sandwich dans une cage de Faraday. Les émissions électromagnétiques rayonnant à partir d'une surface extérieure de la couche de blindage supérieure ou inférieure sont sensiblement réduites. Dans une structure, une carte de circuits imprimés à couches multiples montées en sandwich comprend au moins une couche conductrice intérieure (70) offrant un plan de masse disposé entre les couches de blindage extérieures, la couche conductrice intérieure (70) étant en contact électrique direct avec les moyens de blindage de bords et, ainsi, avec les couches conductrices extérieures (20, 22). La zone de surface plus grande et plus continue assurée par la connexion directe au blindage de bords permet une connexion électrique efficace ayant une faible inductance, de sorte que lors du fonctionnement tous les plans de masse ont un potentiel non variable plus constant.

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