Advanced Qualification · A-007 Feedlines and matching · A-007-008-005
What is included in the total resistance of an antenna system?
- A Radiation resistance plus ohmic resistance
- B Radiation resistance plus transmission resistance
- C Transmission line resistance plus radiation resistance
- D Radiation resistance plus space impedance
Correct answer: A — Radiation resistance plus ohmic resistance. From the official ISED question bank, verified word for word.
Why
The total resistance of an antenna system combines two parts: radiation resistance, which represents the useful power sent out as radio waves, and ohmic resistance, which accounts for the heat lost in the metal wires and connections. 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.