Advanced Qualification · A-007 Feedlines and matching · A-007-009-001
Le guide d'onde est généralement utilisé :
- Aaux fréquences inférieures à 150 MHz
- Baux fréquences inférieures à 1 500 MHz
- Caux fréquences supérieures à 3 000 MHz
- Daux fréquences supérieures à 2 MHz
Correct answer: C — aux fréquences supérieures à 3 000 MHz. Question tirée de la banque officielle d'ISDE.
Why
Waveguide is a hollow metal tube that carries radio energy most efficiently only when the signal wavelength is small enough to fit inside, which happens at very high frequencies above 3000 MHz. 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