CST – Computer Simulation Technology

Axial-mode wire Helix with Linearly Tapered Ends

Image of the Axial-mode wire helix with linearly tapered ends. Image of the Axial-mode wire helix with linearly tapered ends.

The axial-mode wire helix antenna with linearly tapered ends consists of a linearly tapered bottom section, a uniform middle section and a linearly tapered top section, mounted on a circular ground plane.

The end-tapers serve to match the feed and the termination of the uniform helix to the feed line and free-space, respectively, while the central uniform helix operates as an ordinary axial-mode helical antenna. These matching techniques improve the axial ratio and impedance behavior of the uniform helix by reducing the generation of unwanted modes. [Angelakos and Kajfez]

Comparing the axial ratio and impedance response of this antenna to an ordinary axial-mode helix highlights the advantage of tapering the ends. One disadvantage is that the tapered ends reduces the gain when compared to an ordinary axial-mode helix. ...

Polarisation-specific gain pattern at the center frequency Polarisation-specific gain pattern at the center frequency Axial ratio of antenna with tapered-ends compared to ordinary axial-mode helix Axial ratio of antenna with tapered-ends compared to ordinary axial-mode helix Input impedance of antenna with tapered-ends compared to ordinary axial-mode helix Input impedance of antenna with tapered-ends compared to ordinary axial-mode helix

D. J. Angelakos and D. Kajfez, “Modifications on the axial-mode helical antenna”, Proceedings of the IEEE, vol. 55, no. 4, pp. 558–559, Apr. 1967.

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