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EMI Radiation Mitigation for Heatsinks Using Characteristic Mode Analysis

Electromagnetic interference (EMI) radiation is one of the vital problems that design engineers may face. As the frequency of an electronic device increases, the potential for a heatsink to act like a radiating antenna also increases. In this paper, characteristic mode (CM) analysis has been applied to investigate the radiation mechanism for the flat heatsink. With the eigencurrent distribution from CM analysis, it can be verified that the radiation characteristics of the flat heatsink behaves like a patch antenna, and the resonant frequencies predicted with CM agree favorably with cavity model. Meanwhile, the optimal position to put the absorbing material can be identified with the dominant eigencurrent distribution. With this proposed method by applying CM analysis, a better shielding performance and less consumption can be achieved.