基于铁氧体材料(YIG)的微带环行器设计与仿真

摘要

Using high purity Y2O3 and Fe2O3 as raw material, Y3FesOi2 (YIG) materials were prepard by solid state reaction, and the material samples were characterized by VSM, Agilent 4291 Band SEM. The prepared YIG material has dielectric constant of about 15 and saturation magnetization μoM of about 180mT. Based on the prepared material a circulator was designed, and three-dimensional simulation model was set up and simulated using Ansoft HFSS electromagnetic simulation software. Influence of substrate thickness and magnetic field was analyzed on the performance of the circulator. A 6-8GHz bandwidth circulator was prepared, with insertion loss of - 0.59dB, isolation of - 18dB, VSWR of 1.12 in center frequency f=7GHz, and with maximum insertion loss of -0.87dB, minimum isolation of - 15dB, maximum VSWR of 1.36 in frequency range 6 to 8GHz.%以高纯度的Y2O3、Fe2O3为原料,用固相反应法制备Y3FesO12( YIG)材料,通过VSM、SEM、Agilent 4291B对材料样品进行分析、测试.结果表明,所制备的YIG材料介电常数大约为15,饱和磁化强度μ0Ms约180mT.基于该材料设计环行器,利用Ansoft HFSS仿真软件建立三维电磁场仿真模型对设计的环行器进行仿真、分析.分析了基片厚度以及外加磁场对环行器性能的影响.最后制作了一个带宽为6 ～ 8GHz的环行器.利用矢量网络分析仪Agilent8722ES测试器件的典型散射参数,在中心频率f=7GHz处,环行器的插入损耗为-0.59dB,隔离度为-18dB,电压驻波比为1.12;在6～8GHz范围内,环行器的最大插入损耗为-0.87dB,最小隔离度为- 15dB,最大电压驻波比为1.36.