About solution frequency in HFSS

hi everybofy;

i have some problems about HFSS.

there is a variable, named "solution frequency" in HFSS/Analysis setup/add solution setup. i dont know the meaning of this variable. when i changed this value, the S(21) caractersitics shift and change. what must i do or where am i making wron?

and sometimes, when i move the simulation directory to another place, characteristics also changes too.

could you help me plz. what must i do?

It is the frequency used to define the initial mesh. However, when the solution reached reasonable convergence and stable, the change should not be significant.

wlcsp