02.07.2013 Views

Lignes de transmission - IUT Bordeaux 1...

Lignes de transmission - IUT Bordeaux 1...

Lignes de transmission - IUT Bordeaux 1...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Module S11<br />

Phase [ rd ]<br />

Détermination <strong>de</strong> la vitesse v <strong>de</strong> propagation dans un câble RG58 par<br />

mesure <strong>de</strong> l’impédance<br />

1<br />

0.5<br />

câble RG58 1m<br />

0 0.5 1 <strong>1.</strong>5 2 2.5 3 3.5 4<br />

x 10 8<br />

0<br />

5 100MHz<br />

0<br />

0 0.5 1 <strong>1.</strong>5 2 2.5 3 3.5 4<br />

x 10 8<br />

-5<br />

Fréquence [ Hz ]<br />

analyseur<br />

<strong>de</strong> réseaux<br />

circuit<br />

ouvert<br />

L’analyseur <strong>de</strong> réseaux mesure le coefficient <strong>de</strong> réflexion Γ<br />

47<br />

jβx<br />

− jβx<br />

I x = Ae − Be<br />

Zc<br />

Zl infinie<br />

1<br />

Équation du courant<br />

( )<br />

( )<br />

I ( x = 0)<br />

= 0 → A = B<br />

Coefficient <strong>de</strong> réflexion<br />

B −2<br />

jβx<br />

Γ(<br />

x = 1m)<br />

= e<br />

A x=<br />

1m<br />

Γ = 1<br />

− 4πf<br />

phase ( Γ)<br />

= −2β<br />

=<br />

v<br />

phase (Γ)=-2π<br />

pour f=100MHz<br />

4π<br />

100 x10<br />

v =<br />

2π<br />

6<br />

8<br />

x48<br />

= 2 10 m / s

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!