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A 12-Pole K-Band Wideband High-Temperature Superconducting Microstrip Filter

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13 Author(s)
Jin Guo ; Beijing Nat. Lab. for Condensed Matter Phys., Inst. of Phys., Beijing, China ; Liang Sun ; Shuyu Zhou ; Yongbo Bian
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A 12-pole wideband high-temperature superconducting (HTS) microstrip bandpass filter is reported in this paper. The filter has a center frequency of 23 GHz and a bandwidth of 4.2 GHz. The filter was fabricated on a 2-in-diameter 0.25-mm-thick MgO wafer with double-sided YBCO films. Both edge and end coupling structures were employed in this paper to achieve the desired bandwidth. An insert coupling structure was used for input/output coupling to realize the remarkably strong coupling. A microwave-absorbing material was used to eliminate cavity resonances. The measured results show a midband insertion loss of 1.3 dB, a return loss better than 9.5 dB and an out-of-band rejection of over 55 dB on both sides of the passband.

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Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 2 )