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目前商用环行器均需要外加偏置磁场,体积大,难集成。利用厚度为0.2mm的锶永磁铁氧体材料,基于带线结环行器理论,设计、优化并制作了一种自偏置微带双Y结环行器,器件无需外加偏置磁场,可显著降低环行器的体积和重量,便于集成化。测试结果和仿真结果基本吻合。测试结果表明,制作的器件在17.5GHz和29.3GHz频率点处均呈现明显的环行性能。在17.5GHz处,电压驻波比为1.3,插入损耗为4.2dB,隔离损耗为20.4dB。在29.3GHz附近,隔离损耗为18.1dB。在30.3GHz附近,插入损耗为3.1dB,电压驻波比约为1.2,最后探讨了所制作的环行器的插入损耗偏大的原因。
Commercial circulators currently require external bias magnetic field, bulky, difficult to integrate. A self-biased microstrip double Y-junction circulator is designed, optimized and fabricated by using strontium ferrite material with a thickness of 0.2mm. The device can reduce the bias magnetic field without external bias magnetic field Circulator size and weight, easy to integrate. Test results and simulation results are basically consistent. The test results show that the fabricated devices exhibit obvious loop performance at 17.5GHz and 29.3GHz frequency points. At 17.5GHz, the VSWR is 1.3, the insertion loss is 4.2dB and the isolation loss is 20.4dB. In the vicinity of 29.3GHz, the isolation loss is 18.1dB. In the vicinity of 30.3GHz, the insertion loss is 3.1dB and the voltage standing wave ratio is about 1.2. Finally, the reasons why the insertion loss of the circulator fabricated is too large are discussed.