wave port and non-model object ?

I am trying to excite a CPW using wave port ,i have seen a method to use an extra pec box for the use of assigning the direction of the incident energy.but will it affect the computation accuracy of the field? can i set the pec box to non-model object and designate a face of it wave port?

Best regards!

I have the same question? hope anyone help me too! thanks a lot

I don't think so. I believe non-model objects are ignored by the solver.