Advanced Qualification · A-007 Feedlines and matching · A-007-008-010
Si la résistance ohmique d'un dipôle demionde est de 2 ohms et que la résistance de rayonnement est de 72 ohms, quelle est l'efficacité de l'antenne?
- A100 %
- B97,3 %
- C74 %
- D72 %
Correct answer: B — 97,3 %. Question tirée de la banque officielle d'ISDE.
Why
Antenna efficiency measures how much power turns into radio waves instead of heat. 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