Advanced Qualification · A-007 Feedlines and matching · A-007-005-007
A parabolic antenna is very efficient because:
- A all the received energy is focused to point where the pick-up antenna is located
- B a dipole antenna can be used to pick the received energy
- C no impedance matching is required
- D a horn-type radiator can be used to trap the received energy
Correct answer: A — all the received energy is focused to point where the pick-up antenna is located. From the official ISED question bank, verified word for word.
Why
A parabolic antenna works like a satellite dish, using its curved shape to bounce incoming radio waves and concentrate them all onto a single small point where the receiving antenna sits. 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.