Advanced Qualification · A-007 Feedlines and matching · A-007-004-011
In a half-wave dipole, where does the minimum impedance occur?
- A At the centre
- B It is the same at all points
- C At the right end
- D At both ends
Correct answer: A — At the centre. From the official ISED question bank, verified word for word.
Why
In a half-wave dipole, the electrical current is strongest right in the middle while the voltage is lowest, and since impedance is the ratio of voltage to current, this balance creates the minimum impedance at the centre. 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.