Advanced Qualification · A-007 Feedlines and matching · A-007-009-004
For rectangular waveguide to transfer energy, the cross-section should be at least:
- Athree-eighths wavelength
- Bone-eighth wavelength
- Cone-quarter wavelength
- Done-half wavelength
Correct answer: D — one-half wavelength. From the official ISED question bank, verified word for word.
Why
A rectangular waveguide acts like a hollow pipe for radio waves, and it cannot carry energy unless the pipe is wide enough to fit at least one-half wavelength of the signal inside. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching is section A-007 of the Advanced exam: Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.
Drill A-007 — free, no account