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Microwave measurements of surface impedance of high-Tc superconductors using two modes in a dielectric rod resonator

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2 Author(s)
Y. Kobayashi ; Dept. of Electr. & Electron. Eng., Saitama Univ., Urawa, Japan ; H. Yoshikawa

A novel technique using two resonant modes in a dielectric rod resonator, the TE021 and TE012 modes, is proposed to measure the surface impedance Zs=Rs+jXs , where Rs is the surface resistance and Xs is the surface reactance of high-Tc superconductors at microwave frequency. The temperature dependence of Zs can be obtained from only one time measurement as a function of temperature, although the conventional two-resonator method needs to repeat the measurement for temperature twice. The high precision in the Rs measurement is comparable to the conventional two-resonator method using two ceramic rod resonators, The excellent repeatability in the Xs measurement is superior to that of the two-resonator method

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:46 ,  Issue: 12 )