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Lignes de transmission - IUT Bordeaux 1...

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Matrice chaîne d’un tronçon <strong>de</strong> ligne<br />

tronçon <strong>de</strong> ligne <strong>de</strong> longueur L c<br />

Équations<br />

tension<br />

et<br />

courant<br />

Matrice chaîne d’un tronçon <strong>de</strong> ligne<br />

V 1<br />

⎡ Z1<br />

+ Z2<br />

⎤<br />

⎢<br />

− Z1<br />

⎥<br />

⎡V2<br />

⎤ Z<br />

⎢<br />

2<br />

⎥⎡V1<br />

⎤<br />

⎢ ⎥ =<br />

⎢ ⎛ ⎞ + ⎥⎢<br />

⎥<br />

⎣I2<br />

⎦ ⎜ Z + ⎟ ⎣ ⎦<br />

⎢<br />

− 1 2Z2 Z1<br />

Z2<br />

I1<br />

⎜ 2 ⎟ ⎥<br />

⎣ ⎝ Z2<br />

⎠<br />

Z2<br />

⎦<br />

Matrice chaîne<br />

I 1<br />

⎧<br />

jβx<br />

− jβx<br />

U ( x)<br />

= Ae + Be<br />

⎪<br />

⎨<br />

⎪ 1<br />

I ( x)<br />

=<br />

⎪⎩<br />

Zc<br />

jβx<br />

− jβx<br />

( Ae − Be )<br />

L c<br />

quadripôle<br />

avec :<br />

x 2<br />

I 2<br />

⎧<br />

⎪<br />

⎨<br />

⎪<br />

⎩<br />

x 1<br />

V 2<br />

⎛ ⎞<br />

= ⎜ π ⎟<br />

⎝ λ ⎠<br />

c L<br />

Z1<br />

jZcsin<br />

2<br />

1<br />

2<br />

( π )<br />

λ<br />

c<br />

Z = − jZc<br />

L<br />

tg<br />

43<br />

Métho<strong>de</strong> : écrire ( ) 1 , ,<br />

et puis éliminer A et B :<br />

V U x1<br />

= ( ) 2 V U x2<br />

=<br />

( ) 1 I I x1<br />

= ( ) 2 I I x2<br />

=<br />

44

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