how to calculate S11?

hi,all
recently i am designing a power divider,what i understand,when S11 is so low,then it can bring a good resulet,but how to calculate the S11? is there any link that can answer my question or can somebody help me ? thnx in advance.

S11 = Reflected/Incident Power

hi,sunny
thnx for yu help,but how can i get the reflected and incident power or voltage in ADS?

You never asked about ADS and obviously have not used the help menu on the web page....

https://edasupportweb.soco.agilent.c...s11&ref=search

hi,sunny
thnx very much!