Basic Qualification · B-006 Feedlines and antenna systems · B-006-004-005
As the frequency of a signal is changed, what happens to signal loss in a transmission line?
- A Signal loss increases with increasing frequency
- B Signal loss increases with decreasing frequency
- C Signal loss increases as the square of frequency
- D Signal loss is the same for any frequency
Correct answer: A — Signal loss increases with increasing frequency. From the official ISED question bank, verified word for word.
Why
As the frequency of a signal goes up, the electrical resistance inside the wire of your transmission line also rises, causing more energy to turn into heat before it reaches the antenna. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.