How to simulate mutual inductance?

I am working on CMOS RF circuit and the package we choose has mutual inductance between neigher lead in its equivalent package model. I have never simulated such a mutual inductance before. Does anyone know how to simulate the mutual inductance? I am using ADS and Cadence SprectreRF for simulation tools.

THX

Hi
If you use the 3D EM simulation instruments such as hfss ,you can draw the package models and set many ports on which you want to know the mutual impedances.After simulation you can get the mutual impedance through the S [parameters .
I think it is a good and efficient methods
Regard