Patent ID: 6639144
Filing Date: 2003-10-28
Classification: G06F,H05K

Abstract:
A reduced electromagnetic emission circuit board assembly, comprising:a circuit board having at least one ground plane; at least one magnet affixed in proximity to said at least one ground plane of die circuit board such that magnetic flux from said at least one magnet is operable to perturb current flow through the ground plane thereby reducing electromagnetic emissions; and a conductive circuit board trace configured to carry current a predetermined distance on said circuit board; wherein said at least one ground plane is characterized by a first path of low resistance, said first path of low resistance being a first return path associated with the conductive circuit board trace prior to affixing the at least one magnet in proximity to said at least one ground plane; and wherein said at least one ground plane is characterized by a second path of low resistance, said second path of low resistance being a second return path associated with the conductive circuit board trace after affixing the at least one magnet in proximity to said at least one ground plane, said second return path having a higher impedance than said first return path due to perturbing the current flow.