High-Temperature Superconducting Multimode Ring Resonator Ultrawideband Bandpass Filter

High-Temperature Superconducting Multimode Ring Resonator Ultrawideband Bandpass Filter
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高温超导多模环形谐振器超宽带带通滤波器

DOI:
10.1109/lmwc.2018.2845116
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发表时间:
2018-06
影响因子:
3
通讯作者:
Fu Zihao
Fu Zihao
中科院分区:
工程技术2区
文献类型:
--
作者:
Zhang Tianliang;Tian Mingen;Long Zhihe;Qiao Man;Fu Zihao

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本文通过在环形谐振器的垂直对称平面上加载微带线,并在微带线的中心加载一对阶跃阻抗开桩,提出了一种新的多模环形谐振器超宽带(UWB)带通滤波器。在UWB波段内分配了5种模式,并引入了一对传输零以提高通带选择性。采用平行耦合线,不仅实现了合适的外部耦合,而且提高了上阻带的性能。这种五模高温超导超宽带滤波器是在0.5 mm厚的MgO衬底上设计的,衬底上有双面YBCO薄膜。测量结果表明,3db带宽覆盖1.57 ~ 6.51 GHz,回波损耗优于10.70 dB,下阻带带外抑制大于24.75 dB,上阻带20 dB衰减水平扩展到约9 GHz。
This letter presents a new multimode ring resonator ultrawideband (UWB) bandpass filter by loading a microstrip line on the vertical symmetrical plane of a ring resonator and a pair of stepped-impedance open stubs at the center of this microstrip line. Five modes are allocated within UWB band, and a pair of transmission zeros are introduced to improve the passband selectivity. By adopting the parallel-coupled lines, not only suitable external coupling is achieved, but also the performance of upper stopband is improved. This quintuple-mode high-temperature superconducting UWB filter is designed on a 0.5-mm-thick MgO substrate with double-sided YBCO films. The measured results show that 3-dB bandwidth covers 1.57–6.51 GHz, the return loss is better than 10.70 dB, the out-of-band rejection is greater than 24.75 dB in the lower stopband, and the upper stopband with 20-dB attenuation level is extended to about 9 GHz.
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