Advanced Qualification · A-007 Feedlines and matching · A-007-009-005
Which of the following statements about waveguide IS NOT correct?
- AIn the transverse magnetic mode, component of the electric field is in the direction of propagation
- BWaveguide has low loss at high frequencies, but high loss below cutoff frequency
- CWaveguide has high loss at high frequencies, but low loss below cutoff frequency
- DIn the transverse electric mode, component of the magnetic field is in direction of propagation
Correct answer: C — Waveguide has high loss at high frequencies, but low loss below cutoff frequency. From the official ISED question bank, verified word for word.
Why
Waveguides act like pipes for radio waves, carrying signals with very little loss at high frequencies, but they block almost all energy below a specific cutoff point, causing high loss in that lower range. 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.
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