Basic Qualification · B-006 Feedlines and antenna systems · B-006-008-006
The resonant frequency of an antenna may be increased by:
- A lengthening the radiating element
- B shortening the radiating element
- C lowering the radiating element
- D increasing the height of the radiating element
Correct answer: B — shortening the radiating element. From the official ISED question bank, verified word for word.
Why
Shortening the radiating element makes the antenna physically smaller, which causes it to resonate at a higher pitch, or 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.