about vacuum dimensions aroud the EBG

hi everyone;

i m going to resimulate the EBG structure in the paper. but results are not fitting. also when i changed the dimensions of vacuum, S(21) characteristic of the structure changes too. what must i do? and where am i making wrong?

could you look at the simulation file?

( i simulated Fig.1 and its characteristics is in Fig. 5. )

HFSS simulation file and the interested paper is attached.

It is not wrong the simulation in my pc, see again may be cuz your software.

hi cuongtran;
did you run my simulation file? is this file has same result as in the paper? if it is different, would you send your file to me?