【摘要】 研制了一种高选择性的24阶切比雪夫(Chebyshev)型高温超导带通滤波器,其中心频率为1748MHz、带宽为75MHz,适用于GSM移动通讯基站系统.此滤波器是在直径为3英寸、厚度为0.43毫米的铝酸镧双面超导薄膜上制作的.滤波器的计算机仿真是用Sonnet软件完成的.在滤波器设计中,提出了一种结构新颖的谐振器.在77K时,它具有很高的品质因子,约为30000.测试结果表明,该滤波器具有很好的选择性,带边陡度为17dB/MHz,带外抑制优于-90dB.更多还原

【Abstract】 This paper presents a highly selective 24-pole Chebyshev HTS bandpass filter. The filter was designed at 1748 MHz center frequency with 75 MHz bandwidth, which was suitable for the GSM base station. The filter was fabricated using double-sided YBCO films on a 3 inch diameter, 0.43mm thick sapphire substrate. The simulation of the filter performance was carried out by Sonnet software. A novel resonator structure was proposed. The resonator exhibited a very high Q value about 30000 at 77 K. The filter showed an excellent selectivity. At the band edge of the filter, the slope was about 17 dB/MHz. Out of band the rejection level is better than -90 dB.更多还原