Advanced Qualification · A-007 Feedlines and matching · A-007-008-007
How is antenna percent efficiency calculated?
- A(effective radiated power / transmitter output) x 100
- B(radiation resistance / total resistance) 100
- C(radiation resistance / transmission resistance) x 100
- D(total resistance / radiation resistance) 100
Correct answer: B — (radiation resistance / total resistance) 100. From the official ISED question bank, verified word for word.
Why
Antenna percent efficiency measures how much of the electrical power actually becomes radio waves versus how much turns into 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.
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