Separating Substrate and Ground Changes S11 Significantly

Please login with a confirmed email address before reporting spam

Hey guys,

I'm working on simulating an antenna with a ground plane (green). Initially, the ground was modeled as part of the substrate, but since I want to study different ground geometries, I split them into two separate blocks: one for the substrate and another for the ground.

However, even before modifying the geometry, I'm seeing a significant difference in results. For instance, the S11 parameter shifts from -64 dB (combined model) to -23 dB (split model).

I've tried several things to resolve this, including:

Using Union, Compose, Ignore interior faces, and Merge entities

Adding a boundary layer in the mesh (but it takes ~2 hours just to generate the mesh)

None of these have solved the issue so far. Has anyone dealt with something similar? Is there a better way to replicate a layer?

Any insights would be greatly appreciated!



Reply

Please read the discussion forum rules before posting.

Please log in to post a reply.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.