Garnet ferrite materials with high dielectric constant were prepared by solid-state reaction method.Based on the optimized material properties,the three-dimensional electromagnetic field simulation model of X-band microstrip circulator was optimized using the Ansys HFSS simulation software,and the physical development was carried out via microelectronic technology.The experimental results show that the dielectric constant of the garnet ferrite material is 26,and the ferromagnetic resonance linewidth of the material at about 9 GHz is 100 Oe.The simulation results show that in the range of 8 to 12 GHz,the insertion loss of the microstrip circulator is less than 0.4 dB,with the isolation greater than 20 dB,and the voltage standing wave ratio less than 1.2,showing a good circulator performance.The test results show that the insertion loss is less than 1 dB,with the isolation greater than 18 dB,and the voltage standing wave ratio less than 1.25 in the X-band.The deterioration of the measurement performance mostly derive from the high dielectric loss of the garnet ferrite,and the other reason is the error caused by the fabricating and testing process.Compared with the microstrip circulator developed by the conventional dielectric constant garnet ferrite material,the circulator sample has smaller volume and weight,realizing the miniaturization and light weight.
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