question aboute design of ferrite stripline circulator

hi every body
i want to design a ferrite stripline circulator with hfss,i read previous posts...but i have a question
i know the parameters of ferrite and stripline...but i dont know how to define ports...i know the size of the ports are important,i dont know how and where i should put them
this is the example of it...
http://www.4shared.com/office/J7CI4ojB/file.html

the link you have sent requires login for download. it would help if you can post an image of your design or the hfss project file.