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对研制的高温超导滤波器子系统进行了介绍,它由一个相位自均衡的10阶高温超导滤波器、一个低温专用的低噪声放大器和制冷装置组成.高温超导滤波器的中心频率为1955MHz,相对带宽为0.51%,采用Sonnet仿真,并由双面Tl2Ba2CaCu2O8超导薄膜制作而成,衬底材料为0.5mm厚的LaAlO3.测试结果表明滤波器的最小插入损耗约为0.16dB,带外抑制好于75dB,下边带陡峭度为27dBMHz-1,上边带陡峭度为22dBMHz-1.滤波器子系统的增益为19.3dB,噪声系数为0.8dB.此外,还对高温超导滤波器的群时延失真进行讨论,并介绍了一种设计自均衡线性相位高温超导滤波器的有效方法.
The developed high temperature superconducting filter subsystem is introduced, which consists of a phase self-balanced 10-stage high-temperature superconducting filter, a low-temperature-specific low noise amplifier and refrigeration device.The center frequency of high temperature superconducting filter is 1955MHz, the relative bandwidth of 0.51%, using Sonnet simulation and made of double-sided Tl2Ba2CaCu2O8 superconducting thin film, the substrate material is 0.5mm thick LaAlO3 test results show that the minimum insertion loss of the filter is about 0.16dB, out of band Suppression better than 75dB, the steepness of the sideband is 27dBMHz-1, the steepness of the sideband is 22dBMHz-1. The gain of the filter subsystem is 19.3dB, the noise figure is 0.8dB. Delay distortion is discussed, and an effective method to design a self-balanced linear phase high temperature superconducting filter is introduced.