Advanced Qualification · A-007 Feedlines and matching · A-007-008-011
If the ohmic resistance of a miniloop antenna is 2 milliohms and the radiation resistance is 50 milliohms, what is the antenna efficiency?
- A52%
- B25%
- C50%
- D96.15%
Correct answer: D — 96.15%. From the official ISED question bank, verified word for word.
Why
Antenna efficiency measures how much power turns into radio waves instead of heat, calculated by dividing the radiation resistance by the total resistance. 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