Adding material to the face of the substrate

[Prospermin]

Hello, can anyone help me...? I want to design a new project. At the start of the project, I chose a box in which by default the material is vacuum. I want to design in which the two faces of the substrate in the z-axis to be copper but the spaces between the two faces to be vacuum.

 

[kazbek]

If you consider your copper electrodes as perfect conductors (if you don't care about field penetration into the conductor or resisitive losses) you can simply assign perfect-E boundary condition to these faces.

 

[PlanarMetamaterials]

You could also apply a "finite conductivity" boundary and set the properties to be that of copper.