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|標題:||Attenuation of electromagnetic pulse using high temperature superconductor||作者:||Chiu, T.H.
|關鍵字:||CPW;fault current limiter;superconducting transmission lines;thin;film devices;microwave-power limiter;fault current limiters;films||Project:||Ieee Transactions on Applied Superconductivity||期刊/報告no：:||Ieee Transactions on Applied Superconductivity, Volume 17, Issue 2, Page(s) 1831-1834.||摘要:||
A high-speed thin-film resistive type fault current limiter (FCL) manufactured from YBCO thin film has been developed. It is designed to protect the front-end of the communication systems from damage due to electromagnetic pulses caused by thunder strikes or unexpected radiations. A 50 Omega coplanar wave-guide (CPW), fabricated on an YBCO thin film coated on an MgO or LaAlO3 substrate up to 3 inch diameter, is used as the FCL. The resistivity of the YBCO central stripe will raise many orders of magnitude in a very short time automatically if the current pulse exceeds the critical current (I-C) of the superconductor film. We design a meandering pattern to increase the effective length of the CPW, and also the normal state resistance. This FCL design is shown to have a switching time less than 10 ns, and the capability of tackling electromagnetic pulses with very large magnitude. The samples were cooled below 89 K in vacuum by a closed-cycle refrigerator, and tested with pulse-modulated 2 GHz electromagnetic signals of power up to 50 dBm. Our results show an 18 dB power attenuation while the input power exceeds 34 similar to 44 dBm at various temperatures slightly below T-c.
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