EMI Coupling Paths and Mitigation in a Board-to-Board Connector
Cage connectors for optical subassembly I/O modules have been identified as one of the main coupling paths in an optical link at the front-end of switches and routers. In the study presented herein, the simulation model used to study electromagnetic interference coupling physics and mitigation of the optical cage connector was corroborated by comparing the measured and simulated results for the total radiated power (TRP). Currents on the adjacent ground references to the differential signal conductors caused half-wave resonant peaks in the TRP response in the frequency range of 4-18 GHz. At frequencies from 18 to 28 GHz, both full-wave simulation and analytical formulas indicate that the radiation results primarily from the currents on the signal traces. The radiation from the optical cage connector was suppressed with absorbing materials, and the coupling path was verified, together with the optical cage and module enclosure.
J. Li et al., "EMI Coupling Paths and Mitigation in a Board-to-Board Connector," IEEE Transactions on Electromagnetic Compatibility, vol. 57, no. 4, pp. 771-779, Institute of Electrical and Electronics Engineers (IEEE), Aug 2015.
The definitive version is available at https://doi.org/10.1109/TEMC.2015.2439687
Electrical and Computer Engineering
Center for High Performance Computing Research
Second Research Center/Lab
Electromagnetic Compatibility (EMC) Laboratory
Keywords and Phrases
Electromagnetic pulse; Electromagnetic wave interference; Interference suppression; Signal interference; Absorbing materials; Coupling paths; High frequency HF; mitigation; Optical cages; Radiation mechanism; Total radiated power; Optical switches
International Standard Serial Number (ISSN)
Article - Journal
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