The radiation physics, mitigation approaches and design guidelines of high-speed connectors and cables analyzed with numerical modeling, analytical formulation and measurements
The dissertation is composed of three papers, which cover the radiation and mitigation of high-speed connectors and cables analyzed with full wave simulation, numerical modeling, analytical formulation and measurements. In the first paper, the radiation from the optical cage connector in the frequency range of 4-28 GHz is analyzed with validated full-wave simulation model and analytical formulas. The radiation from the optical cage connector is suppressed with absorbing materials, and the coupling path in optical link is verified, together with the optical cage and module enclosure. In the second paper, radiation from antenna-mode current and TL-mode current is briefly reviewed with backplane connector and optical cage connector. The radiation from the high-speed connector with TL-mode current is analyzed in detail. The possible radiation mechanisms are analyzed through Green’s function method, steepest descent method, and EMC Studio method of moment (MoM). Design guidelines of high-speed connectors for EMI mitigation are proposed based on the analysis of radiation physics. In the third paper, the 2D finite element method (2D FEM) is developed to analyze electromagnetic interference (EMI) reduction when magneto-dielectric absorbing materials are applied to cables, which is much less time- and memory-consuming compared to a 3D numerical simulation. To give insightful guidelines to the engineers who use absorbing materials as a mitigation approach to suppress the EMI from cables, cables with different absorbing materials, different diameters, lengths, and source impedances are analyzed with the developed 2D FEM. "--Abstract, page iii.
Missouri University of Science and Technology
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