On the development of superconducting microstrip filters for mobile communications applications
On the development of superconducting microstrip filters for mobile communications applications
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DOI：
10.1109/22.788606
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发表时间：
1999-09
影响因子：
4.3
通讯作者：
Jiasheng Hong;M. Lancaster;D. Jedamzik;R. Greed
中科院分区：
文献类型：
--
作者：
Jiasheng Hong;M. Lancaster;D. Jedamzik;R. Greed
本文介绍了一种具有准椭圆函数响应的八极平面高温超导带通滤波器的最新进展。一种新颖的平面滤波器配置，允许一对传输零点被放置在带边描述。微型HTS滤波器具有小于1%的分数带宽，并且被设计用于移动的通信基站应用以增加灵敏度和选择性。文中讨论了滤波器的特性、设计方法、灵敏度分析和谐振器的无载品质因数。该滤波器是使用双面YBCO薄膜上的MgO衬底的尺寸为0.3/spl倍/22.5/spl倍/39毫米。非常好的实验结果，获得了与使用液氮冷却的过滤器。测得的最小通带损耗约为1 dB。对于1738.5 MHz的中心频率，从最小损耗点向下1 dB的点处的通带宽度为12.8 MHz。高选择性实现了16 MHz的30 dB抑制带宽。
This paper presents recent developments of an eight-pole planar high-temperature superconducting (HTS) bandpass filter with a quasi-elliptic function response. A novel planar filter configuration that allows a pair of transmission zeros to be placed at the band edges is described. The miniature HTS filter has a fraction bandwidth less than 1% and is designed for mobile communication base-station applications to increase sensitivity and selectivity. Design considerations including filter characteristics, design approach, sensitivity analysis and unloaded quality factor of resonators are addressed. The filter was fabricated using double-sided YBCO thin film on an MgO substrate of size 0.3/spl times/22.5/spl times/39 mm. Very good experimental results were obtained with the filter cooled using liquid nitrogen. The minimum passband loss was measured to be approximately 1 dB. The passband width at points 1 dB down from the minimum loss point was 12.8 MHz for a center frequency of 1738.5 MHz. High selectivity was achieved with a 30-dB rejection bandwidth of 16 MHz.