Numerical study of a circulator using yig thin film with a coplanar structure

Abstract

The transmission characteristics of a high frequency circulator, using coplanar waveguides, have been designed and studied. To miniaturize the device, we have dramatically reduced the thickness of the YIG (Yttrium Iron Garnet) ferrite layer. The circulator has a hexagonal shape with dimensions of 10 × 10 mm2; the width of the central line (LINE) is 400 µm; the space between LINE-to-GND is 130 µm and the thickness of the YIG film is 10 µm. This compact circulator operates at 10 GHz. The insertion loss is 3.14 dB; the return loss is 18.57 dB and the isolation is greater than 20 dB.