The distance between the vias makes a highpass filter for the range of emitted frequency. Smaller distance, higher fequency. To make it really safe, ask your pcb supplyer for copper around the edges of the pcb.
sorry for confusion. Maybe this picture is bether for understanding:
The catwalk around the PCB shall be protected earth and the filled zone shall be ground.
We defined the inner area as “keep out copper fill”. But i want this 1. layer as ground layer with isolation to the catwalk.
@T1992 CatWalking around in circles…
You’ve been shown how to:
• Place things on Layers and how to Change Layers
• Draw Shapes and Fillet Corners
• Set and Fill Zones
• Set and Use Keep-Out Zones
• Add Via and Terminals to Tracks and Filled Areas/Polygons
• Create and Use SVG made from a Shape
By now, you should know that if Setting KeepOut Fill, then, you can’t fill it with a Ground Plane.
I conclude my effort with following video, the rest is up to you to explore, try, fail and learn…
Sometimes it’s difficult to filter a long thread with several different answers and opinions to find relevant information. It of course doesn’t help if the original question was open to interpretations.
This time it looks to me like a good candidate for custom rules because the rule area is there already. But it requires more learning than just using graphical shapes and GUI dialogs.
There are different ways to do things - not suggesting my approach is the way to go so, I post this screenshot as an FYI… do what’s best for your project…
Good Luck 
If the outline of your PCB is available as a DXF I do the following:
- make a copy of the DXF open it in LibreCAD.
- copy the outline in a new layer
- go back to layer 0
- take the make Parallel tool from the lines menu
- If you want a 1mm catwalk around your board outline make a 0.5mm parallel (LibreCad wants a decimal, no comma) of your outline to the inside of your PCB. You have to use the parallel tool multiple times for each line, radian, …
- then use the trim two tool to remove overlapping ends. So you will have a nice line within your PCB
- remove the original outline
- edit the line attributes in layer 0 to width of 1mm
- save file. This file can be imported by Kicad (Import, Graphical Elements)
- Import it two times into F.Mask and B.Mask. This will give you a nice rim around your PCB.
For the Vias that are placed along this ring I duplicate a GND Via, so PCBnew knows which net to attach to. Then I place it outside of the PCB. Select a grid like 2,5mm. Then I place (duplicate) a series of Vias with this grid, so I get nice spacing. Many Vias can be selected and duplicated again. Then I switch back to my standard 0,1mm grid. Select as many vias as I need, duplicate again and move them on the outer ring.
The final reslut looks like this:
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