Experimental study of electromagnetic coupling between two transmission lines

摘要

The problems of electromagnetic compatibility (EMC) have been taken into account in almost all faculties of electrical engineering in the world. However, EMC phenomena are only partially mentioned in the small chapters of individual electrical engineering courses and the education is largely focused on one specific EMC area for this reason; the goal of this paper is to explain the problem with an easy experimental way [1].In electromagnetic pollution phenomenon, the power cable is a key component from point of view of EMC. It present in the same time, a privileged propagation path of conducted perturbations, a large band radiator element and a vulnerable input channel to extern electromagnetic assaults. The wide diversity of cable types, as well as various environmental and geometrical configurations, make of wiring an example all adapted to the new demand of generic modeling in EMC. The electromagnetic perturbations such as the coupling by inductive or capacitive crosstalk are a big problem for the good operation of transmission lines system. In this work, a measuring bench contains a vectors-type networks analyzer "module and phase" allowing the measure of the transfers function S21 in dB was performed in order to predict and measure the crosstalk coupling between the transmission lines.