Summary
International Symposium on Electromagnetic Compatibility
2009
Session Number:21Q2
Session:
Number:21Q2-4
Reduction of Induced Voltages Deriving from Ground Return Currents for Two Perpendicular Signal Traces on Printed Circuit Boards
T. Maeno,
pp.101-104
Publication Date:2009/7/20
Online ISSN:2188-5079
Summary:
Electromagnetic disturbances in vehicle-mounted radios are caused by conducted noise current outflows from vehicle-mounted PCBs (Printed Circuit Boards) to wiring-harnesses. To investigate a design method that can suppress the noise current of this kind, we measured and simulated FM-band induced voltages deriving from ground return currents for spatially different two perpendicular signal traces fabricated on three types of simple three-layer PCBs having the same ground patterns with two slits. The results show that the induced noise voltages can be reduced whenever ground pattern slits are symmetric to one signal trace that equally divides the other trace. This finding was qualitatively explained from a balanced bridge circuit concept.