Testing the effects of releaving ground plane beneth a component

[joeqsmith]

Sweeping the gap from fully closed in 100 mil increments.   Gap is anchored to the left edge and opens towards the right as shown.   Slot=550.0 is closed.  The other settings are the same as before in AppCAD. 

I wouldn't expect the wave shape to change as it does.   

Hopefully this give you enough test cases to try.   

[joeqsmith]

Still using the symmetry mode but moving both ends of the gap to avoid the diagonals, I had hoped some of the data would make a little more sense.   I also thought it may reduce the memory requirements and speed up the simulation. 

[neilhao]

Oh, I just did the similar work related SMA connector in UWB application. I have to use slot for eliminating the impedance mismatching between PCB trace and the SMA footprint.
My two cents:
https://uniteng.com/wiki/doku.php?id=uwb:evb#uwb_front-end_design

[joeqsmith]

https://www.simberian.com/

Similar experiments with SIMBEOR. 

[Marsupilami]

Still using the symmetry mode but moving both ends of the gap to avoid the diagonals, I had hoped some of the data would make a little more sense.   I also thought it may reduce the memory requirements and speed up the simulation.

Did you come up with anything conclusive since?
Work went crazy in the past couple of weeks, I didn't have any time, but I'm still curious to see a comparison to measurements.

[joeqsmith]

Still using the symmetry mode but moving both ends of the gap to avoid the diagonals, I had hoped some of the data would make a little more sense.   I also thought it may reduce the memory requirements and speed up the simulation.

Did you come up with anything conclusive since?
Work went crazy in the past couple of weeks, I didn't have any time, but I'm still curious to see a comparison to measurements.

Sadly, I was never able to make any sense of it.   I suspect I am just asking too much out of the free tools.   It's a very interesting topic and it would be fun to experiment more with it.  Sadly, I was not able to find limited versions for the more modern tools and their costs far exceed my hobby budget.