This can cause a variety of issues during PCB layout if you don’t plan properly ... sometimes unexpectedly. An example of how the return path can be affected by a hole in the ground plane ...

One example of a successful PCB design project with UL 508A certification is a custom control panel for a water treatment plant that monitors and controls the flow, pressure, and quality of water.

I ended up using 2 custom footprints not in the KiCAD library so I included the .kicad_mod library files here. They can be imported into the footprint editer and saved in a local library if needed.

Make sure you have a good ground plane alongside the bottom of the antenna (use plenty of vias). See DN004 for further details about PCB layout. Example implementation with the TI CC2538: If you use ...

I would suggest to use split planes (RTN, POWER GND) in TOP (L1) and BOTTOM (L4) layers like the 2-layer example in the datasheet. Use RTN plane for layer L2 and GND plane for layer L3.

[Phil] tipped us off about a new software package that will let you import PCB layout files into Google Sketchup. This way you can start working on the enclosure in CAD before you’ve populated ...