DXF Antenna Import Looks Distorted and Shows Extra Ring Structures

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1

hi,

I tried importing a trace antenna into KiCad using a .dxf file, but the shape came out distorted and not as expected. I also noticed ring-like structures appearing around the antenna that shouldn’t be there.

Has anyone faced this issue before? Did I miss any step during the import?
Would appreciate any suggestions on how to fix this.

Thanks!

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2

I think thats a radius that couldn’t be figured out correctly and was made into a full circle.

I guess you are on V6 ? or V7 ? maybe V9.0.2 ? on Mac ?

Can you paste your version info here please, you can get it from KiCad > Help > About KiCad > Copy Version Info
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3

Also where did that dxf come from? There are versions of dxf and some generation bugs from CAD around

4

Application: KiCad PCB Editor x64 on x64

Version: 8.0.9, release build

Libraries:
wxWidgets 3.2.6
FreeType 2.13.3
HarfBuzz 10.0.1
FontConfig 2.15.0
libcurl/8.10.1-DEV Schannel zlib/1.3.1

Platform: Windows 11 (build 22631), 64-bit edition, 64 bit, Little endian, wxMSW
OpenGL: Intel, Intel(R) UHD Graphics 620, 4.6.0 - Build 27.20.100.8729

Build Info:
Date: Feb 19 2025 02:28:49
wxWidgets: 3.2.6 (wchar_t,wx containers)
Boost: 1.86.0
OCC: 7.8.1
Curl: 8.10.1-DEV
ngspice: 44
Compiler: Visual C++ 1942 without C++ ABI

Build settings:

1 Like
5

The DXF file was downloaded from Murata’s official website

6

Can you post the DXF file here or a link to it on Murata website please.

1 Like
7

Try unchecking “Fix discontinuities”

2 Likes
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9

Select what you have imported, Ungroup, select the big circle and delete it . . .

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10

For something like this I’d use the DXF as a guide to the positions of tracks, vias etc. Not use it directly as is.

11

Indeed, that would also be my conclusion. I would:

  1. Create a footprint.
  2. Load the DXF into the footprint editor.
  3. Place a pad at the connection point of the L shaped antenna.
  4. Use Pad Edit Mode to add graphic shapes to the pad, and trace over the “L”.
  5. Delete the DXF again.

What sort of tolerances to such antenna’s have? It’s quite easy to trace over it and reproduce it with 10 micron or so. I assume that’s plenty. KiCad has default grids to 1um, but that requires a bit more zooming in and panning.