Patch antenna with slots

hello does any help me how to design slots in patch antenna...when i finish designing single patch antenna i want to do two narraw slots so can any one help me how to calculate dimensions of slot and how to do these points in the CST

see the papers of kay fung lee from Mississippi university

thanks ferdows, i tried to get but still i cant get any paper talking about it...so would you help me.
thanks in advance.
khaled