Sonnet - how to put slots in ground plane?

Hello,

I'm new to Sonnet and am trying to design a wideband patch antenna by adding slots in the ground plane. However, I am stuck on how to switch to the ground plane to modify it. I've attached my file to show where I am - I've drawn the microstrips on top of the substrate, got the frequency response, I just need to modify the ground. Can someone please give me some pointers?

Thanks.



[EDIT] - I added another layer of air at the bottom and drew the ground using copper. Is this correct or not? Any other feedback regarding anything is welcome.

Hello,

[EDIT] - I added another layer of air at the bottom and drew the ground using copper. Is this correct or not? Any other feedback regarding anything is welcome.

Yes this is the way you need to model the Slotted Ground plane in Sonnet...
Just add an additional Air layer below the substrate layer & then draw the metallic structure which will act as ground plane, but make sure you touch the enclosure / box to ground the same...

Also I see your initial antenna structures requires little bit changes for Antenna simulation setup in Sonnet...
Say make sure Box walls are far away from Antenna patch structure
I modified & got better results for your structures...


---manju---