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Characteristic Mode Analysis and New Ground Approach At a Heat-sink for Reducing EM Radiation
Seung-Han Son* and Chang-Hoi Ahn
Abstract A heat-sink has been widely used to cool down the heat generated from an electronic device, but it can bring unwanted electromagnetic radiation which may cause EMI problems. We propose a systematic method to reduce the electromagnetic radiation by using the multiple grounding technique based on the grounding criteria and the theory of characteristic mode analysis. Our proposed method provides the insight to find the specific grounding positions which can be effectively reduced the radiation from the heat-sink. Numerical experiments are accomplished to validate this approach.
Keyword Electromagnetic radiation, Multiple grounding, Characteristic Mode Analysis (CMA), Surface current distribution
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