Investigation of Radio-Frequency characteristics of discrete EMC filter elements

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Szombathy Csaba Zoltán
Department of Broadband Infocommunications and Electromagnetic Theory

This thesis is a commencing work towards Electro -Magnetic Compatibility (EMC from now on) – especially driven noises filtering focusing on filter improvement project. A part of the thesis documents literature-studying, and EMC-discovering. It gives a comprehensive summary about EMC problem types and defending possibilities against them. The document acquaints man about the importance of EMC in automotive industry and about the international standards actually ruling the design, production and testing at nowadays automotive manufacturers. The goal of the document is an analysis study on discrete elements of a driven noise filter which absorbs the noises of a DC-engine in its’ controller towards power system. My goal is to measure the differential-mode noise suppressor ferrite-core inductor and other filter elements by vector-analyzer two-port measurements. The objective of the semester is to determine the impedance characteristics of these elements in RF range. This is normally 150 kHz to 108MHz, though I’m implementing the measurement in range of 9kHz to 1GHz. For the ferrite-based solenoid inductor an RF model is to be created. The simulation – which had been carried out with CST Microwave Studio® - high frequency simulator tool – is being validated by the vector analyser based RF – impedance measurement. The result of the element simulation is the base model I can use in generally used in the earlier studies filter-topologies. Approaching to exact model with equal operation of a real filter I use 2D realistic termination environment for the filter, and implement the parasitic element-model to reach real-filter attributes. After that an optimal filter is to be suggested for use, then based on the 3D coil-element model, the 3D filter topology is being created, and co-simulated with the parasitic discrete element and excitation containing 2D simulation, to get high similarity with the real filter. Then the model is being checked and validated with real measurement.


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