Si une ligne de transmission d'une impédance caractéristique de 50 ohms alimente un dipôle replié avec une impédance au point d'alimentation proche de 300 ohms, quel rapport de transformation d'impédance est nécessaire pour adapter les deux?

Why

To match a 50 ohm line to a 300 ohm antenna, you need to transform the impedance by dividing the higher value by the lower one, which gives 300 divided by 50 equal to 6. 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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