I would like to know how to design a ferrite core working at Ka band and [6 - 18] GHz.

CASE STUDY:

I'M TRYING TO DESIGN A CIRCULATOR OPERATING IN Ka BAND AND [6 - 18] GHz. The circulator consists of a dielectric as substrate and a copper layer on it. On the copper layer is located in the middle a Ferrite core.

The issue regards the Ferrite.

How can I design a ferrite? Which value Can I assign to for example Conductivity, Magnetic Dispertion, material density and so on?

I use CST STUDIO SUITE SOFTWARE for simulation

Thanks