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Design of an S-Band HTS Filter With High Power Capability

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7 Author(s)
Dandan Bai ; Beijing Nat. Lab. for Condensed Matter Phys., Inst. of Phys., Beijing, China ; Xiaofeng He ; Xueqiang Zhang ; Hong Li
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A ten-pole S-band high-temperature superconducting filter with excellent frequency response and high power capability is reported in this paper. The filter was fabricated on a 3-in-diameter 0.5-mm-thick LaAlO3 wafer with double-sided YBCO films. The filter has 4.8% fractional bandwidth centered at 2.15 GHz. The return loss is better than 15 dB, and the out-of-band rejection is better than 80 dB. The power handling capability of the filter was evaluated using a sweep measurement method. The filter has handled 33 dBm (2 W) of input power with no measurable performance degradation over the whole band at 60 K. Furthermore, the in-band (2.11-2.19 GHz) power handling capability of the filter is up to 35.8 dBm (3.8 W) at 60 K.

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Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 6 )