Advanced Qualification · A-007 Feedlines and matching · A-007-001-008
How does a network transform one impedance to another?
- A It produces transconductance to cancel the reactive part of an impedance
- B It introduces negative resistance to cancel the resistive part of an impedance
- C Network resistances substitute for load resistances
- D It cancels the reactive part of an impedance and changes the resistive part
Correct answer: D — It cancels the reactive part of an impedance and changes the resistive part. From the official ISED question bank, verified word for word.
Why
A matching network works by adding components that create an opposite reactance to cancel out the unwanted reactive part of an antenna's impedance, leaving only the resistance. 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.