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New measurement technique of the surface impedance of superconductors using the probe-coupling type microstripline resonator

We have developed a probe-coupling type microstripline resonator method for accurate measurement of the surface impedance of superconductors. By this improved microstripline resonator method, the surface impedance can be measured without attaching any contacts to the film. This paper reports the accurate and reproducible measurement process of surface impedance using the probe-coupling type microstripline resonator. The surface impedance of a YBCO thin film was measured using this technique. The measured results revealed that this technique may be used for the accurate measurement of surface impedance.