[help] Bandpass Filter with DGS

hi guys..

i have to finish my final project about Bandpass filter with DGS at 1885-2200 MHz..
i am designing with AWR simulator..

can anyone help me to design it in AWR or HFSS ?
1. what is the relation between dimension and L, R, C ?
2. what is the formula for calculating DGS ?

thanks for help...