Research On The Low Loss Of YIG And Its Application In Circulator

The research of YIG is the basis of studing other garnet ferrite materials, since it has unique spin magnetic properties and good performance parameters(narrow Ferromagnetic resonance linewidth, etc.). So it was widely used in different frequency bands of microwave ferrite devices. Today, the research to change the parameter characteristic of YIG become one of the main topics. This article adopts the way of ion substitution to produce ferrite materials(such as Y3Fe5-xSbxO12(x=0~0.4) 、Y3xCaxFe5-xZrxO12(x=0~0.6), Y3Fe5-2xZnxZrxO12(x=0~0.3) 、 Y3-xCaxFe5-xSnxO12(x=0~0.6) 、Y3Fe5-2xZnxSnxO12(x=0~0.35)). And the preparation method was solid phase sintering. The influences on microstructure and magnetic properties with ion substitution for yttrium iron garnet ferrite were investigated. The results show that with the increasing of Sb3 + ion substitution, ferromagnetic resonance line width and dielectric constant are increasing.Ca2 + Zr4 +, Zn2 + Zr4 +, Ca2 +Sn4 +, Zn2 +Sn4 + ions substitution reduce the ferromagnetic resonance line width of YIG materials, when x is 0.4,0.1,0.3,0.25, the ferromagnetic resonance line width is the minimum value. but with the increasing of ion substitution quantity, YIG which contains Zr ion may generate the other phase, and YIG with Sn ion substitution generate YIG phase in the experiment, Sn ion replaced the ions of the YIG lattice, With the increment of ion substitution, YIG properties such as density and saturation magnetization are keeping changing. This paper also studies the preparation of the 1.4-1.6 GHz microstrip circulator. Firstly, according to the magnetic characteristics of YIG material, we use ferrite microstrip circulator design theory to calculate the size of the model. Secondly, the Ansoft-HFSS was adopted to creating model and emulating the electro-magnetic field for circulator. Finally we used the result to draw the model by CAD, then we used screen printing technology to prepare the circulator, to test the S parameters of circulator easily we designed a test fixture. In this experiment we used a vector network analyzer to test S parameters, the test result show that the design of circulator is feasible, this experiment also verified the practicability of YIG material.