Can't make curved tracks

Bug #1577958 reported by robotarmy on 2016-05-03
This bug affects 44 people
Affects Status Importance Assigned to Milestone
Seth Hillbrand

Bug Description

It's essential for some high speed and RF layout to be able to easily create curved tracks using arcs (or maybe even NURBS splines?)

My current method involves drawing an arc on a non-copper layer and tracing around it with copper and that's bunk.

Changed in kicad:
importance: Undecided → Wishlist
Jeff Young (jeyjey) on 2018-04-05
Changed in kicad:
status: New → Triaged
sto (f4eru) wrote :

Curved tracks are a must for Flex PCBs to avoid stress concentration in the flexible zones.

tags: added: pcbnew
Benjamin (benjwy) wrote :

I've read the forum discussion which devolved into devs attaching images of electric fields showing that curved traces are not necessary. That's a big call to make.

It is disappointing that the developers of the project are excluding a feature due to their "superior" EM knowledge. In the RF/microwave industry, no package will be taken seriously if it can't do curved traces. In fact even when using professional tools like Allegro we have always done the geometries in AWR/ADS and imported the GDSII.

If Kicad's goal is to remain in the hobbyist arena, then this decision is justified. If they really want to challenge Altium and Cadence then something will have to be done about this feature.

Appreciate all the effort the devs make, but this call sounds crazy to me.

Seth Hillbrand (sethh) wrote :

@benjwy- Always better to start with questions than assumptions here.

No one is excluding curved tracks. Certainly no devs are claiming superior EM knowledge. We've in feature freeze for v5 right now. New features like this will need to wait for v6.

You can find some relevant dev discussion at

Benjamin (benjwy) wrote :

@sethh- Yup, fair enough.

On reflection, it was an assumption it was a developer - but someone arguing for excluding a feature like curved traces because it was a "technical myth" made my internet frustration levels rise!

Looking forward to the feature in v6. Would love to help out, but my software skills are probably not up to it.


Hi guys,
I switched from Altium ti KiCAD a year ago and bevery very happy.
One of features iI really missing: rounded traces. Its possible to do them with some workarounds, but not really elegant and some of them looks ugly as well.
It will be really nice to have this feature built in.
Best regards from Germany,

Seth Hillbrand (sethh) on 2019-03-24
Changed in kicad:
assignee: nobody → Seth Hillbrand (sethh)
milestone: none → 6.0.0-rc1
status: Triaged → In Progress
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