YIG Thin Film Used to Fabricate a Coplanar Waveguide Circulator

The requirements of mobile communication devices are today invariably associated with the miniaturization of microwave components. The development of Yttrium iron garnet (YIG) is of great interest to miniaturize these devices. The present work deals with the integration of YIG ferrite sputtered films of 10 mu m thick for coplanar circulators, working at frequencies near 10 GHz. A small circulator with a coplanar structure is designed and analysed using a three dimensional finite element method. Aimed at this objective, we work on the development of a miniature planar circulator/isolator. The circulator is designed with coplanar waveguides. The structure is analysed by using a three dimensional finite-element method. The circulator is then fabricated, and its properties in the microwave range are characterised using a network analyzer and a probing system. A circulation is obtained around 10 GHz, the measured insertion loss and isolation giving interesting perspectives for the device.