Basic Qualification · B-006 Feedlines and antenna systems · B-006-012-007
What is a disadvantage of using an antenna equipped with traps?
- A It may radiate harmonics more readily
- B It is too sharply directional at lower frequencies
- C It picks up more noise than a simple dipole
- D It can only be used for one band
Correct answer: A — It may radiate harmonics more readily. From the official ISED question bank, verified word for word.
Why
Antenna traps act like filters that isolate sections of the antenna for different frequencies, but they can sometimes fail to block unwanted higher-frequency signals called harmonics, allowing them to escape and cause interference. 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.