Helical antenna
AssigneePoynting Antennas (Pty) Limited
InventorsAndries Petrus Cronje Fourie, Derek Colin Nitch
Life of this patent
Estimating the term…
Abstract
An antenna 10 comprises a single wire wound in a helix 12 comprising a plurality of turns 1, 2, 3, n, n+1, . . . p around a main axis 11 with immediately adjacent turns having an inter-turn spacing between them. The helix has a back end 14 and a front end 16 and the main axis defines a main beam direction. A transverse crosssectional area of the helix monotonously decreases from the back end 14 to the front end 16. The inter-turn spacing S1 . . . Sn . . . monotonously decreases from the backend 14 to the front end 16. A feed-point 13 is provided at the back end 14.
Claims9
A unifiliar axial mode helical antenna comprising:
- a single wire wound in a helix comprising a plurality of turns around a main axis with adjacent turns having an inter-turn spacing between them, the helix having a back end and a front end and the main axis defining a main beam direction, a transverse cross-sectional area of the helix monotonously decreasing from the back end to the front end and the inter-turn spacing monotonously decreasing from the backend to the front end;
- and
- a feed-point at the back end.
Dependencies are inferred from the claim text.