Advanced Qualification · A-007 Feedlines and matching · A-007-009-009
A section of waveguide:
- A operates like a band-stop filter
- B is lightweight and easy to install
- C operates like a high-pass filter
- D operates like a low-pass filter
Correct answer: C — operates like a high-pass filter. From the official ISED question bank, verified word for word.
Why
A waveguide acts like a high-pass filter because it only allows radio signals above a specific frequency to travel through it, while blocking lower frequencies that are too long to fit inside the metal tube. 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.