I’m trying to export my pcb design to a hyperLynx file for doing EM analysis using openEMS.
Apparently, pcbNew does not include traces inside a footprint when it exports to a hyperLynx file. That’s an issue for me, since I want to evaluate different pcb antennas, and the different designs are encapsulated in footprints.
I tried opening one in the foot print editor, selecting everything, then copy/pasting to the pcb being edited in pcbNew. But, pcbNew still thought the shapes were a footprint and didn’t include the traces in the export.
Is there a different workaround I can use (other than drawing everything again in pcbNew) to get the traces in the footprints “flattened” on the pcb so they get exported?
I have no experience with Hyperlinx, but KiCad does not draw traces (a.k.a tracks) in footprints. KiCad does make a significant distinction between copper tracks and graphical items, even if those graphical items are on a copper layer.
You can add graphical items to a pad in the footprint editor. To do that:
- Open the Footprint Editor, load some footprint
- Add a pad and select it.
- Depress Ctrl + e to enter “pad edit mode”
- Draw some graphics. It should overlap with the pad itself, which becomes the attachment point of the normal copper tracks.
- When finished, depress Ctrl + e again to end the Pad Edit mode
- Save your artwork and use it on a PCB.
I do not know if such a footprint exports properly to Hyperlinx.
Footprints don’t get included in an HyperLynx export, but the pads do.
I didn’t realize I can have an arbitrary pad shape! I’ll give that a try (after writing scripts to basically merge footprints with imported Hyperlinx in OpenEMS)
The footprint polygon ends up having rounded outside corners. Also, the “net tie” keyword doesn’t keep the layout editor from clearing a zone area from the pad.
The rounded corners make the geometry unusable in openEMS. And, I’d have to add a shape to bridge the “zone to pad” clearance the layout editor insists on adding.
If I have to do those operations, it’s not easier than using my script that reads the footprint data and creates the geometry in openEMS
It is interesting that the polygon I created as a footprint directly (versus pad edit mode) did NOT have the rounded corners. No clue why or if I inadvertently did something different when editing the pad.
Polygons have “Line width” which cause rounded corners. It can be set to 0 for filled shapes.
I see, so in FP editor I was designing polygons. So my script could read the shapes without them being corrupted by corner rounding.
Yes, I can eliminate the rounding in the footprint by setting line width to zero.
Now, if the “net tie” would work. I had it working previously,something must be different now. I’ll revisit soon.
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