If you are using the macro available in CST, you can use a parameter to define each element of the tensor or you can define it as a frequency dependent function ( I am using CST 2016). You can use these parameters in parametric sweep also.

Greeting,

Take the following steps in CST:

1>> in macro tab choose plasma as a dispersive material (or other material).

2>> right click on the material and add plasma as a new material

3>> click on the plasma in materials that you have used in your model (you will see the attached Fig.

4>> choose dispersion tab

5>> According to your material you can choose different dielectric dispersion here (I have choose gyrotropic in the attached Fig.)

For example, when a homogeneous magnetic biasing field is present in addition to the assumptions for the cold plasma, the effective material properties can be described by a gyrotropic permittivity tensor in CST. The input plasma parameters are: plasma frequency, collision frequency, cyclotron frequency, and biasing direction of the static magnetic field.

You can also go to our paper in the following link:

https://www.researchgate.net/publication/318287481_A_Simulation_Study_of_the_Factors_Affecting_the_Collisional_Power_Dissipation_in_a_Helicon_Plasma

You may be able to find the macro in the history list and edit the values in the macro and replace them with the names of the parameters. I think this works. Values are in double quotes, so are parameter names. You may need to create the parameters first, or it may ask you for them when you refresh the history list.