Abstract
It is a common technique to use resonators to determine the surface resistance of high-temperature superconductors through the measurements of unloaded Q0 factor and resonant frequency. As the surface resistance may change very significantly between the normal and superconducting states, the quality factor may also have a large variation between the two states. It is thus desirable to develop measurement techniques to deal with the possible large variation in Q0 values. Six methods are proposed in the paper for both one- and two-port coupled resonators. These techniques are suitable for a network-analyser-based automated system used for the determination of surface resistance of superconductors. Example measurements using these techniques are also given.
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