Advanced Qualification · A-007 Feedlines and matching · A-007-008-001
What is meant by the radiation resistance of an antenna?
- A The specific impedance of an antenna
- B The combined losses of the antenna elements and transmission line
- C The equivalent resistance that would dissipate the same amount of power as that radiated from an antenna
- D The resistance in the atmosphere that an antenna must overcome to be able to radiate a signal
Correct answer: C — The equivalent resistance that would dissipate the same amount of power as that radiated from an antenna. From the official ISED question bank, verified word for word.
Why
Radiation resistance is a mathematical shortcut that treats the power an antenna sends out into the air as if it were heat lost in a regular resistor. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.