In this paper we have studied the mode coupling effect from analysis of the measured microwave S-parameters of superconducting films using a parallel-plate-resonator technique. Because of its high resolution and simplicity, this technique has been widely used to identify the microwave surface resistance. To minimize the radiation loss, the parallel plate resonator is usually housed in a conductive cavity. We used HFSS to simulate the model. In this paper we mostly compared the resonance of empty cavity and the resonance of parallel plate resonance with the cavity enclosure. By comparison we could distinguish the superconductive PPR mode from the differences in two graphs and we depressed the resonant frequency to 4.7 GHz.
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