Advanced Qualification · A-007 Feedlines and matching · A-007-005-001
What is meant by circularly polarized electromagnetic waves?
- A Waves produced by a circular loop antenna
- B Waves with a rotating electric field
- C Waves with an electric field bent into circular shape
- D Waves that circle the earth
Correct answer: B — Waves with a rotating electric field. From the official ISED question bank, verified word for word.
Why
Circular polarization happens when the electric field of a radio wave spins around as it travels forward, much like a corkscrew moving through space. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.