This assigment focuses on the IEC 61000-4-6:2023 standard, which defines test methods for assessing the immunity of electronic devices to radio-frequency conducted disturbances. Special attention is given to the role of coupling/decoupling networks (CDNs), which enable precise, repeatable, and standardized injection of disturbances into the equipment under test. Different types of CDNs and their importance in ensuring electromagnetic compatibility (EMC) are presented.
The main objective of the thesis was to design and build an M3-type coupling/decoupling network compliant with the standard, ensuring the required common-mode impedance up to 230 MHz. In the practical part, the circuit was constructed, optimized with ferrite components, and mounted into a custom enclosure. Measurements performed with a vector network analyzer confirmed that the device maintained the prescribed 150 Ω ± tolerance across the entire frequency range, thereby fulfilling the requirements of the standard.
The results demonstrate that with proper component selection and careful design, it is possible to construct a functional CDN-M3 suitable for testing the electromagnetic immunity of electronic equipment. The work thus combines a theoretical overview of EMC with valuable practical experience in designing, building, and testing coupling/decoupling networks.
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