Basic Qualification · B-006 Feedlines and antenna systems · B-006-005-008
The result of the presence of standing waves on a transmission line is:
- A maximum transfer of energy to the antenna from the transmitter
- B lack of radiation from the transmission line
- C reduced transfer of RF energy to the antenna
- D perfect impedance match between transmitter and transmission line
Correct answer: C — reduced transfer of RF energy to the antenna. From the official ISED question bank, verified word for word.
Why
Standing waves happen when the antenna does not perfectly match the transmission line, causing some radio frequency energy to bounce back toward the transmitter instead of going out as a signal. 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.