Vector fitting on f-domain models should be implemented with extra emphasis on preserving causality. [VecctorFitting](https://scikit-rf.readthedocs.io/en/latest/tutorials/VectorFitting.html#Vector-Fitting) To reduce stiffness, the group delay should be abstracted away and then combined with a delayed differential equation (DDE)
Vector fitting on f-domain models should be implemented with extra emphasis on preserving causality.
VecctorFitting
To reduce stiffness, the group delay should be abstracted away and then combined with a delayed differential equation (DDE)