Advanced Qualification · A-007 Feedlines and matching · A-007-005-009
One antenna which will respond simultaneously to vertically-and horizontally-polarized signals is the:
- A ground-plane antenna
- B quad antenna
- C helical-beam antenna
- D folded dipole antenna
Correct answer: C — helical-beam antenna. From the official ISED question bank, verified word for word.
Why
A helical-beam antenna uses a spiral wire shape that naturally accepts signals regardless of whether they arrive with vertical or horizontal polarization. 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.