Advanced Qualification · A-007 Feedlines and matching · A-007-009-001
Waveguide is typically used:
- A at frequencies above 3000 MHz
- B at frequencies above 2 MHz
- C at frequencies below 150 MHz
- D at frequencies below 1500 MHz
Correct answer: A — at frequencies above 3000 MHz. From the official ISED question bank, verified word for word.
Why
Waveguide is a hollow metal tube that carries radio energy most efficiently only when the signal wavelength is small enough to fit inside, which happens at very high frequencies above 3000 MHz. 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.