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Problem in RF line clearance/Pad clearance
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nader95 3 years ago
Hey guys, I've been facing this issue for quite a while now and I would like to see how the community manages to get around it. My design includes RF transmission lines (TLs), and usually, we would like to keep a certain clearance from the ground plane surrounding it. Now, I'm aware that you can add a net-specific rule which can be easily set in the DRC (e.g: RF Lines, clearance: 0.5 mm). However, the TL is connected to a small component with a very narrow pad clearance, and due to the connection between the TL and the component, they all share the SAME net. As a result, a 0.5mm clearance rule for the RF TL net would cause problems in the DRC because the pads of the component have a separation of 0.2 mm (and it has the 0.5mm rule applied to it due to sharing the same net). One solution to this problem is to add a solid region over the TL with No-fill selected, however, solid regions are difficult to bend in a curved pattern, which is often used in RF. Any suggestions? Edit: I believe this is called "Local Pad Clearance" in KiCad. Regards and thanks! ![image.png](//image.easyeda.com/pullimage/aJTCOTeZMpKDrPWjWuuEFOxpUwUbjVrmtQBPkGAA.png) ![image.png](//image.easyeda.com/pullimage/b9G3mtIeTPFxDSXwkjqLgy35wBhWCRD3AJHEOKh5.png)
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andyfierman 3 years ago
Try copying the last segment of track then pasting it , scaling the width up to the desired clearance then converting the scaled up segment to a Solid region set to No Solid then move it back over the desired area where it will create a no copper region the same shape as the desired clearance. A bit difficult to explain so here's an example to copy, study and play with: [https://easyeda.com/editor#id=6c082f60c8e24ef7a373a4897f6ff593](https://easyeda.com/editor#id=6c082f60c8e24ef7a373a4897f6ff593)
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nader95 3 years ago
@andyfierman Perfect, this did the job. Thanks!
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