Abstract
We studied a resonator structure to reduce the current concentration at outer edge of a microstrip line. We developed a new microstrip line consisting of many parallel pieces separated by gaps. Electromagnetic simulations indicated that the current concentration of the outer edge of the sliced microstrip line was lower than that of a conventional microstrip line. We made a 3-pole filter of YBCO thin film using a sliced microstrip line and measured its power handling capability. The power handling capability was better than that of a conventional filter. We also examined other resonator structures to increase the power handling capability, for example, an S-type structure and a wide hair-pin structure. These resonator shapes had better power handling characteristics than a conventional microstrip resonator.
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