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Compatibilité Electromagnétique
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Cours sur la Compatibilité Electromagnétique
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COMPATIBILITEELECTROMAGNETIQUE 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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