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高温超导滤波器已在移动通信、射电天文、雷达探测等多个领域获得了重要应用.当前高温超导滤波器的研究和应用主要集中于10GHz以下的频段,针对超高频段(>10GHz)高温超导滤波器的研究很少.本文设计优化了具有无载Q值高、耦合强、尺寸短等特点的H型阶跃阻抗谐振器,并讨论了超高频段滤波器端口激发源的电容效应对滤波器响应的影响,最后采用优化的H型谐振器,应用去嵌入(De-Embed)设计方法消除端口效应,设计了中心频率为16GHz,相对带宽12.5%的6节高温超导滤波器.研制的超导滤波器在未经调谐的情况下,测试结果与仿真结果符合得很好,插入损耗小于0.3dB,反射损耗优于-14dB,带外抑制达到了-70dB.
HTS filters have gained important applications in many fields such as mobile communications, radio astronomy, radar detection, etc. The current research and applications of HTS filters mainly focus on the frequency bands below 10GHz and for ultra-high frequency (> 10GHz) There are few researches on high temperature superconducting filters.This paper designed and optimized H-type step impedance resonators with high no-load Q value, strong coupling and short size, and discussed the capacitance of the excitation source of ultra-high frequency filter port Effect on the filter response. Finally, an optimized H-type resonator was used to eliminate the port effect by using a De-Embed design. A six-stage HTS filter with a center frequency of 16GHz and a relative bandwidth of 12.5% The developed superconducting filter is in good agreement with the simulation without tuning, the insertion loss is less than 0.3dB, the reflection loss is better than-14dB and the out - of - band rejection is -70dB.