Advanced Qualification · A-007 Feedlines and matching · A-007-006-009
Si une antenne de 3 dBd de gain est remplacée, sans aucun autre changement, par une antenne de 9 dBd de gain, la puissance apparente rayonnée augmentera combien de fois?
- A4
- B6
- C1,5
- D2
Correct answer: A — 4. Question tirée de la banque officielle d'ISDE.
Why
A 3 dB increase in antenna gain doubles the Effective Radiated Power, so adding another 3 dB to reach a total 6 dB increase doubles it again. 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