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.

Meeting Name

2018 IEEE Symposium on Electromagnetic Compatibility, Signal Integrity and Power Integrity, EMC, SI and PI 2018 (2018: Jul. 30-Aug. 3, Long Beach, CA)


Electrical and Computer Engineering


This material is based upon work supported by the National Science Foundation under Grant No. IIP-1440110.

Keywords and Phrases

Busbars; Directional patterns (antenna); Electromagnetic pulse; Electromagnetic shielding; Heat sinks; Microstrip antennas; Natural frequencies; Slot antennas; Absorbing materials; Characteristic modes; Design engineers; Electronic device; Radiating antennas; Radiation characteristics; Radiation mechanism; Shielding performance; Electromagnetic compatibility; EMI; Heatsink

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


File Type





© 2018 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jul 2018