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:
- Amaximum transfer of energy to the antenna from the transmitter
- Black of radiation from the transmission line
- Creduced transfer of RF energy to the antenna
- Dperfect 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
Feedlines and antenna systems is section B-006 of the Basic exam: Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.
Drill B-006 — free, no account