Advanced Qualification · A-007 Feedlines and matching · A-007-008-009
Antenna beamwidth is the angular distance between:
- Athe maximum lobe spread points on the major lobe
- Bthe 6 dB power points on the major lobe
- Cthe 3 dB power points on the first minor lobe
- Dthe points on the major lobe at the half-power points
Correct answer: D — the points on the major lobe at the half-power points. From the official ISED question bank, verified word for word.
Why
Antenna beamwidth measures how wide the main signal beam is, defined specifically as the angle between the two points on the major lobe where the power drops to half its maximum value. 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