Feko support 5.5 define infinite length

Hi ,,please I Have problem to define the infinite length to micro strip line ,
Or ,how can I apply the absorbing boundary condition for this micro strip line?

Not sure in 5.5 but in 6.2 on the Construct tab in CADFEKO click the Periodic Boundaries tool

thank u very much ,but I try it . this is for different purpose .

hi
explain your problem