Is your software capable of solving for an active element pattern?

You can analyze and optimize the "active element pattern" of slot array with the µWave Wizard. That means one element
of the slot array is excited while the others are terminated, or you include a feeding network too. Furthermore, you can also obtain the complete modal scattering matrix of the array. In general the active element pattern will be varying with slot position, except when having a very large (or infinite) array. However, the size of the slot array, which can be analyzed with the µWave Wizard, is restricted. Please refer: Are their other limitations then the size of the slot array?