Modeling a wire zig-zag antenna

Wire zig-zag antenna

Wire zig-zag antenna

It is not always apparent when modeling wire structures whether a thin-wire model approximation will still give reliable answers. We recently included the Wire zig zag antenna in Antenna Magus and had some trouble validating designs of this antenna with many cells. There are various methods to model and physically construct a wire zigzag and we found that the corners of a >10 cell zigzag have a noticeable effect on the performance.

Thin-wire model of a zig-zag corner

Thin-wire model of a zig-zag corner

Detailed triangle mesh model of the zig-zag corner

Detailed triangle mesh model of the zig-zag corner

The thin-wire model is obviously the quickest and easiest way to model the antenna but the simulation results differed from the more detailed triangular mesh model. To see which of the two simulation models could be trusted we built and measured a 12 cell zigzag (shown in the first image above) from copper brazing rods and filed each wire at the correct angle to ensure neat flush corners as shown in the zoomed photo below.

Zoomed view of the zig zag corners

Zoomed view of the zig zag corners

The following image shows a comparison between the measured data and two simulation models which proved that a high gain wire zigzag has to be modeled with more detail.

Comparison between S11 for measured vs two types of simulation models

S11 comparison between the physical and two types of simulation models.

Author: Robert Kellerman

2 Responses to “Modeling a wire zig-zag antenna”

  1. Dana Salah says:

    Can I please have more article of how I can design a Zig-Zag antenna on CST ? the parameters/materials I should use for constructing it and getting the right simulation ?

  2. Konrad Brand says:

    Dana
    Do you currently have Antenna Magus? because then you can just export your design to CST. Otherwise you should create a thin-wire model in CST and use the I-solver to simulate it.

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