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This paper presents experimental and theoretical results for a number of high-temperature superconductive (HTS) planar thin film filters and resonators. The circuits were manufactured using TBCCO films. The measured maximum power handled by each assembled filter and resonator was correlated with the maximum normalized current density predicted by a commercially available software package. The results achieved were used to deduce the critical current density in each HTS device. The data demonstrates that it is possible to predict the power-handling capability of new filter designs by analyzing the results of the current density simulation. Manufacturing and testing resources can thus be limited to those HTS circuit designs which show the greatest potential for high-power handling.