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Modélisations analytiques ILCM d'enceintes résonantes munies d'ouvertures de formes complexes. Application au couplage avec des lignes de transmission

Abstract : This PhD work is dedicated to shielding boxes modeling. Those shielding enclosure usually contains apertures, that are essential for cable cross or, for ventilation. They are commonly used to protect sensitive equipment from external radiated disruptions. Then, the capacity of a metallic shield to correctly limit parasitic interference and coupling is crucial to know for EMC designers. This coupling problem is particularly widespread in EMC domain that engineers have to anticipate. Several simulation tools are available to compute and analyze these electromagnetic problems. However, full wave numerical methods remains computationally intensive and take several hours to reach a solution. Analytical formulations may provide an attractive alternative using a far smaller computation time with a great accuracy, as ILCM models. Based on the transmission line theory, this technique is able to reproduce the electromagnetic cavity behavior and its apertures by means of a circuital approach. In fact, ILCM models considerably simplify the original problem by providing a simple equivalent circuit représentation of the electromagnetic problem. Our analysis deals with a fast, reliable and simple analytical formulation, in order to develop an helpful tool for shielding boxes design. In this document, we describe four improvements of the original model. These improvements have been made to renforce the initial formulation of Martin Paul Robinson, the method's pioneer, giving a more realistic description of the problem. However, our models focus predominantly on empty electromagnetic cavities containing apertures. Then, they constitutes an interesting intermediate step to model realistic shielding enclosures. The analytical ILCM approach has been validated for several configurations exemples, demonstrating the method potential.
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Submitted on : Tuesday, November 17, 2020 - 3:14:12 PM
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Amélie Rabat. Modélisations analytiques ILCM d'enceintes résonantes munies d'ouvertures de formes complexes. Application au couplage avec des lignes de transmission. Electronique. Université Clermont Auvergne, 2019. Français. ⟨NNT : 2019CLFAC092⟩. ⟨tel-02866637⟩

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