desining tool for tandem 3dB coupler

Hello, i am trying to build a tandem 3d coupler ,but there are many file element both vissualyy and impedance varying,i shown in the attached photo,is there a to for designing such couplers so i could export them to CST?

Thanks

But this is a wide-band coupler, do you really need that ?

yes i need a wide band 3db coupler constructed from 8db