Re: HFSS trick!
hi
define a box as your WG.
define the material that fills it.
change selection mode to faces instead of objects
select the faces of box that are usual without slot
assign Perfect Electric boundary condition
NOW FOR SLOTTED FACES OF YOUR WG:
define a usual rectangle (No 1) exactly where it is
subtract another rectangle (No2) (YOUR SLOT) from No1 rectangle.
just select your slotted No1 rectangle
assign Perfect E to it
alert me if it failed so that i can help further