DS90UB953-Q1: how to get S11 and S12 parameter of DS90UB953 to DS90UB954 for simulation

Dears，

   I use DS90UB953 and DS90UB954 in my ADAS product. I want to simulate the transmit-ion  of DS90UB953 to DS90UB954 .

So I want to know the minimum requirements for the s11 and s12 parameter  that enable the DS90UB953 and DS90UB954 to communicate smoothly.