Basic Qualification · B-006 Feedlines and antenna systems · B-006-012-008
What is an advantage of using a trap antenna?
- A It has high directivity at the higher frequencies
- B It has high gain
- C It minimizes harmonic radiation
- D It may be used for multi-band operation
Correct answer: D — It may be used for multi-band operation. From the official ISED question bank, verified word for word.
Why
A trap antenna uses special circuits called traps, which act like switches to change the antenna's electrical length depending on the frequency. 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.