Power handling capability and intermodulation distortion of high-T-c microwave resonators

摘要

The nonlinearity of the microwave properties of coplanar thin-film YBa2Cu3O7-delta resonators are examined by measurements of the degradation of the quality factor Q(L) and the increase of the two-tone third-order intermodulation distortion signal with increasing microwave power. A linear correlation between the data of the characteristic microwave powers, which are obtained for the degradation Of QL and the intermodulation signal, is experimentally observed and explained in terms of a theoretical model. Due to the experimental observation and the theoretical model, we conclude, that (i) the degradation of the resonator Q factor and the generation of intermodulation distortion are determined by the same physical mechanism and that (ii) thermal effects can most likely be excluded. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 4]