Abstract
The unloaded quality factor is used to describe the performance for frequency selection of microwave resonant cavity, and the precise measurement of it is the basis of resonator design. The current traditional measurement method usually has limitations on single-port microwave resonators. In this paper, the traditional method was improved. According to the derived group delay formula, the relationship between the coupling coefficient and the standing wave ratio was judged. The obtained coupling coefficient determined the calculation formula of the unloaded quality factor, thereby obtaining a series of unloaded quality corresponding to different bandwidths. The data within the credible interval were processed to obtain a stable unloaded quality factor with small errors. We applied the improved method to measure and calculate the simulation and experimental results of single-port resonator cavity, which confirms the accuracy and reliability of this method.
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