L'impédance caractéristique d'un tronçon (ou section) de ligne de transmission mesurant 20 mètres est de 52 ohms. Si l'on coupait 10 mètres de ce tronçon, quelle en serait l'impédance?

Why

Characteristic impedance is a fixed property of a transmission line determined by its physical construction, such as the spacing and size of the conductors, not by how long the cable is. The full explanation — and one for every question — is in Pro.

Practise this section

Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.

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