Advanced Qualification · A-007 Feedlines and matching · A-007-003-002
What term describes an unbalanced feed system in which the driven element of an antenna is fed both at the centre and a fraction of a wavelength to one side of centre?
- AThe T match
- BThe gamma match
- CThe omega match
- DThe stub match
Correct answer: B — The gamma match. From the official ISED question bank, verified word for word.
Why
The gamma match fits this description because it uses a single feed line connected to the antenna's centre and another connection point slightly off-centre, creating an unbalanced system that matches the feed line to the driven element without needing a balanced transformer. 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.
Drill A-007 — free, no account