Title :
A 12-Pole K-Band Wideband High-Temperature Superconducting Microstrip Filter
Author :
Jin Guo ; Liang Sun ; Shuyu Zhou ; Yongbo Bian ; Jia Wang ; Bin Cui ; Chunguang Li ; Xueqiang Zhang ; Hong Li ; Qiang Zhang ; Xu Wang ; Changzhi Gu ; Yusheng He
Author_Institution :
Beijing Nat. Lab. for Condensed Matter Phys., Inst. of Phys., Beijing, China
fDate :
4/1/2012 12:00:00 AM
Abstract :
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.
Keywords :
band-pass filters; barium compounds; high-temperature superconductors; microstrip filters; microwave filters; superconducting filters; superconducting thin films; thin film devices; yttrium compounds; K-band; MgO; MgO wafer; YBCO; bandpass filter; bandwidth 4.2 GHz; cavity resonances; double-sided YBCO films; edge coupling structure; end coupling structure; frequency 23 GHz; insert coupling structure; microwave-absorbing material; midband insertion loss; out-of-band rejection; passband; return loss; size 0.25 mm; size 2 in; wideband high-temperature superconducting microstrip filter; Couplings; High temperature superconductors; Microstrip filters; Microwave filters; Microwave measurements; Physics; Resonant frequency; High-temperature superconducting (HTS); K-band; microwave filter; wideband filter;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2011.2171957
