Basic Qualification · B-006 Feedlines and antenna systems · B-006-006-008
Where does impedance matching need to be done to minimize transmission line losses in an antenna system?
- A Anywhere along the transmission line
- B At a quarter wavelength from the transmitter
- C At the junction between the transmission line and antenna
- D At the junction between the transmitter and the transmission line
Correct answer: C — At the junction between the transmission line and antenna. From the official ISED question bank, verified word for word.
Why
Impedance matching must happen where the transmission line meets the antenna because this is where the electrical resistance of the line connects to the resistance of the antenna. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.