Based on BaM-type hexagonal ferrite material,the three-dimensional electromagnetic field model of the microstrip circulator was established by using the finite element simulation software.The structure and size of the Ka-band self-biased circulator were optimized and designed.The effects of the thickness of the ferrite substrate h,radius of the central disc R0 and size of the Y-junction on the performance of the circulator were investigated.The results show that in the frequency range of 26 to 28 GHz,the insertion loss S21 increases with the increase in the thickness of the ferrite substrate(h),while the isolationS12and the return loss S11 increase first and then decrease with the thickness of the ferrite substrate and the radius of the central disk(R0).With the increase in the length and width of the Y-junction,the return lossS11and the isolation S12 increase first and then decrease.After optimization and simulation,in the frequency range of 26 to 27.6 GHz,the insertion loss S21 of the circulator is less than 1 dB,the minimum insertion loss is 0.85 dB,and the maximum isolation is 53 dB.The bandwidth is about 1.6 GHz when the isolation S12 and the return loss S11 are greater than 20 dB,and the profile dimension of the device is 7 mm×7 mm×0.4 mm,which has good circular performance.
万方数据
维普
