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Compatibilité Electromagnétique

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Cours sur la Compatibilité Electromagnétique

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Uploaded on
April 19, 2021
Number of pages
49
Written in
2014/2015
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COMPATIBILITE
ELECTROMAGNETIQUE C.E.M.
Modélisation du couplage par rayonnement
aux basses fréquences.

,SOMMAIRE


Définition des champs proche et lointain




13/10/2014
Modélisation des lignes électriques




ITI CEM
Problématique CEM




DUPERRIER
Couplage capacitif

Couplage inductif

Résolution champ lointain

2

, CHAMPS PROCHE ET LOINTAIN
Amplitude du
Onde électromagnétique champ électrique




13/10/2014
Amplitude du
champ magnétique




ITI CEM
Direction de
propagation

Champ électrique et magnétique qui se propagent de façon ondulatoire,
perpendiculairement l’un à l’autre dans un plan , lui-même perpendiculaire à la direction




DUPERRIER
de propagation

Propagation
source ponctuelle ou sphérique
propagation dans toutes les directions

source directionnelle
direction imposée par les caractéristiques
de l’antenne
3
Il peut y avoir réflexion, diffraction , diffusion voire
absorption de l’onde suivant les milieux rencontrés

, CHAMPS PROCHE ET LOINTAIN
Impedance d’onde
Caractérise l’impédance intrinsèque d’un milieu




13/10/2014
Notation η [Ω]

Par analogie avec l’électronique




ITI CEM
Homogène à une tension


= =




DUPERRIER
Homogène à un courant



Impédance dans le vide ηo


= = = =
. . −
4
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