Compact narrowband high-pole dual-band high-temperature superconducting (HTS) bandpass filters (BPF) have been developed that use newly developed stub-loaded double-folded microstrip resonators. The resonators have a weak coupling property that enables the distance between resonators to be reduced and that suppresses unwanted nonadjacent coupling. Moreover, it enables independent control of the resonant frequencies of the first and second passbands. Additional microstrip lines and a dual-feeding structure are introduced to enable flexible adjustment of the internal and external couplings of the two passbands. A prototype ten-pole dual-band HTS BPF operating at 1.5 and 2.0 GHz was designed and constructed. The filter for both passbands has a 1% fractional bandwidth and was fabricated using YBa 2 Cu 3 O y thin film on an Al 2 O 3 substrate. The measured frequency responses of the filter were in good agreement with the simulated ones. ...

中文翻译：

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使用短负载双折叠谐振器的紧凑型窄带高阶双频超导带通滤波器

已经开发出了紧凑的窄带高极双频高温超导（HTS）带通滤波器（BPF），该滤波器使用了新开发的存根负载双折叠微带谐振器。谐振器具有较弱的耦合特性，从而可以减小谐振器之间的距离并抑制不希望的不相邻耦合。此外，它能够独立控制第一和第二通带的谐振频率。引入了额外的微带线和双馈电结构，可以灵活调整两个通带的内部和外部耦合。设计并制造了工作在1.5和2.0 GHz的原型十极双频HTS BPF。用于两个通带的滤波器具有1％的分数带宽，并使用YBa 2 Cu 3 O y薄膜在Al 2 O 3衬底上制成。滤波器测得的频率响应与仿真结果吻合良好。...