Advanced Qualification · A-007 Feedlines and matching · A-007-004-011
Dans un dipôle demi-onde, où trouve-t-on l'impédance minimale?
- AÀ l'extrémité droite
- BAux deux extrémités
- CAu centre
- DElle est égale partout
Correct answer: C — Au centre. Question tirée de la banque officielle d'ISDE.
Why
In a half-wave dipole, the electrical current is strongest right in the middle while the voltage is lowest, and since impedance is the ratio of voltage to current, this balance creates the minimum impedance at the centre. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching is section A-007 of the Advanced exam: Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.
Drill A-007 — free, no account