The thickness of each layer is listed in the Thickness column of the Grid Control pane in the Edit Layers window. A layer’s thickness is measured on the point of elevation (e.g., if the elevation of a signal layer is 2 microns and the thickness is 4 microns, the layer begins at 2 microns and extends upwards for 4 microns to a height of 6). The units for the thickness is in the Units field of the Stackup pane.
Complete these steps to set a layer’s thickness.
- From the Thickness column of the Edit Layers window, double-click a layer’s Thickness field.
- Type a value and its units in the field. The value can be specified using a number (e.g., 0.5um), a variable (e.g., $H), or an expression (e.g., $H-0.5um+$W).
- Press Enter.The layer is assigned its new thickness.
Assigning thickness to signal layers significantly increases the solution time. The number of unknowns that HFSS software must compute doubles when you increase the thickness from zero (infinitely thin) to a finite number. Therefore, if possible, model signal layers as infinitely thin objects.