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CAD quality requirements

Geometrical model of your antenna plays a big role in how easy or hard it will be to set up and get accurate results from an antenna design simulation.

We have summarized the main aspects for good, simulation-friendly CAD file, which should be followed in order to create a simple, trouble-free geometry for your simulation.

Build your antenna as a single solid

In many CAD softwares it is easier to build the antenna geometry from blocks, which all combined form a complete antenna CAD. When creating geometry for simulation, these blocks should be fused together to form a single solid โ€“ in this way you can get rid of unnecessary faces between blocks and ease not only the work with geometry but simplify the meshing process as well.

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Fuse geometry in FreeCAD

You can easily fuse your geometry blocks together in FreeCAD as well, using Union tool.

  1. Select all parts you want to fuse and click Union

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  1. In Union properties change Refine to true to remove any interface planes and edges between the fused solids.

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Simplify your design

Computer simulation starts with a geometrical model of the real life problem โ€“ you need to accurately depict the geometrical details to precisely calculate the physical aspects of the model. However, in most cases you can disregard some of the geometrical details, which do not have such a significant impact on the physical results, to optimize the simulation.

The following features can be deleted, as they take up significant amount of calculation time and computer power without considerable contribution to results.

Remove irrelevant plastic parts

Depending on the type of your antenna, one or more plastic components might be included in the design. You need to evaluate the relevance of those parts, and remove them if they do not have a significant impact.

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For example, you can

  • remove plastic holders or small parts used for mechanical components

but you should

  • leave any plastic encasings or covers over your antenna.

Delete unnecessary elements

Parts of antenna such as screws, bolts, threads or embedded text can be taken out of your model.

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Port simplification

For physical antennas port or feed is one of the most important parts of the assembly, however, you can easily simplify the port geometry, to make the simulation faster without sigificant losses in precision.

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Resolve incorrect connections

During geometry creation be careful with connections between different parts of your antenna โ€“ inaccurate connections will result in meshing problems and calculation errors!

Overlapping

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Gaps

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