Basic Qualification · B-006 Feedlines and antenna systems · B-006-007-007
What is the three-dimensional radiation pattern of an isotropic radiator?
- A A hemisphere
- B A sphere
- C A torus (donut shape)
- D A cardioid
Correct answer: B — A sphere. From the official ISED question bank, verified word for word.
Why
An isotropic radiator is a theoretical antenna that radiates energy equally in every direction, creating a three-dimensional pattern shaped like a perfect sphere. 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.