What error it shows, please describe more about your problem !.

ACTULLY FOR CPW HELP IN CST SHOWS TO PICK TWO OUTER CONDUCTOR POINTS AND THEN DEFINE PORTS.ONE ANOTHER WAY SOMEBODY TOLD ME THAT I CAN SELECT FACE OF THE SUBSTRATE AND THEN CAN APPLY PORT OVER THERE.SO I AM CONFUSED WHICH ONE IS TRUE !!!!!!!!

I think both could work.

But remember when you try to define wave port; you want to model waves around Microstrip line and substrate. So, the height of wave port must be bigger than substrate height (i think it should be 5 times the Substrate Height).

And the width of port must be bigger than microstrip line width because the field is actually extended a little bit further than the Height and Width of micro-strip line.

Hello,

I think,in the dimensions there is a problem sir

Regards,

Thanks Ahmad for educating me on that !!!!!!!!!!!!!!!!!!!!!