Measurements of the Q of stripline resonators yield values for the attenuation of Nb-Nb2O5-Pb striplines typical of those used in superconducting microcircuits. At 4 K the attenuation between 50 and 500 MHz is proportional to frequency and probably results from dielectric losses. Near the transition temperature of Pb, the attenuation begins to show the frequency-squared dependence associated with superconducting losses.
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R. L. Kautz (1979) studied this question.
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