Attenuation of electromagnetic pulse using high temperature superconductor

Tseng Hsin Chiu, Tung Wuu Huang, Chung Hsi Liang, Dow Chieh Niu, Yuen Wuu Suen, Kuo Hsing Cheng

Research output: Contribution to journalArticlepeer-review


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 Ω coplanar waveguide (CPW), fabricated on an YBCO thin film coated on an MgO or LaAlO 3 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 (Ic) 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 34-44 dBm at various temperatures slightly below Tc.

Original languageEnglish
Pages (from-to)1831-1834
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2
StatePublished - Jun 2007


  • CPW
  • Fault current limiter
  • Superconducting transmission lines
  • Thin film devices


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