Creating a stacked patch antenna

Hello, 

 

I am trying to learn how to stack patch antennas on top of each other.

 

I have created the bottom patch, top patch, bottom dielectric, top dielectric, feed pin, ground, etc. 

 

I want to do the finite substrate. 

 

Do I need to be using 'Dielectric Boundary' Between the two dielectrics? 

 

Fekolearner