【摘要】 基于钡铁氧体材料设计并制作了中心频率在22GHz的自偏置环行器,仿真结果表明,在22.6GHz附近,插入损耗小于0.2dB,隔离和回波损耗均大于30dB。测试结果表明,无外加磁场、铁氧体没有达到磁化饱和时,在22GHz处,器件插入损耗为2.9dB,隔离损耗接近50 dB。为了研究磁化状态对自偏置环行器性能的影响,在测试时施加弱磁场,插入损耗最小值为1.57 dB,出现在频率22.6 GHz处,对应的隔离度为11.4 dB;当施加强磁场时,插入损耗最小值为1.1 dB,对应的隔离度为11.6 dB;对比施加强弱磁场时的测试结果,可发现随外磁场增强,在22.6GHz处插入损耗降低,但是在22GHz处的隔离度变小。更多还原

【Abstract】 In this work,a self-biased microwave circulator with center frequency of 22GHz using barium ferrite material was designed and prepared.The simulation results show that at around 22.6GHz the insertion loss is less than 0.2dB,and both isolation and return loss are greater than 30dB.The experiment results show that without external magnetic field and the ferrite is not magnetized to saturation,the insertion loss is 2.9dB at 22GHz,and isolation loss is close to 50 dB.If weak magnetic field is applied when testing,the minimum insertion loss is 1.57 dB at 22.6GHz,and corresponding isolation is 11.4dB;if a strong magnetic field is applied,the minimum insertion loss is 1.1dB,and corresponding isolation is 11.6dB.Comparing the text results for case of applying strong and weak external magnetic field,we can find that with increasing magnetic field,the insertion loss at 22.6GHz reduces,but the isolation at 22GHz deteriorates.更多还原