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文中研制了一款极窄带宽的六阶高温超导滤波器,成功实现了相对带宽小于1‰的多阶高温超导滤波器的设计与制作.文中给出了极窄带宽高温超导滤波器的等效电路、理论曲线、耦合矩阵、设计过程、模拟仿真结果以及滤波器的物理电路结构,有效解决了极窄带滤波器的设计、材料与加工精度的技术难题,研制的高温超导滤波器使用蒸镀于0.5mm厚度的氧化镁(MgO)基片上的DyBa2Cu3O7双面高温超导薄膜加工制作,滤波器工作频率约为900MHz,相对带宽为0.58‰,滤波器的实际损耗小于0.6dB,带外抑制达到70dB以上,其测试曲线与模拟仿真结果很好的吻合,文中的试验结果标志着多阶高温超导滤波器可以实现的最窄带宽达到了一个新的高度.
In this paper, a very narrow bandwidth six-stage high-temperature superconducting filter has been developed and the design and fabrication of a multi-stage HTS filter with a relative bandwidth of less than 1 ‰ has been successfully achieved.A very narrow bandwidth high temperature superconducting filter The equivalent circuit, the theoretical curve, the coupling matrix, the design process, the simulation results and the physical circuit structure of the filter effectively solve the technical problems of the design, material and processing precision of the extremely narrow band filter. The high temperature superconducting filter Using a double-sided high-temperature superconducting thin film of DyBa2Cu3O7 deposited on a 0.5 mm thick magnesium oxide (MgO) substrate, the filter operates at a frequency of about 900 MHz with a relative bandwidth of 0.58 ‰, and the actual loss of the filter is less than 0.6 dB. The external suppression is more than 70dB. The test curve is in good agreement with the simulation results. The experimental results indicate that the narrowest bandwidth achievable by the multi-stage HTS filter reaches a new height.