在耦合腔结构的高频特性模拟中，基于准周期边界条件法建立的双腔模型，由于两端电场的边界条件完全相同，导致了伪解的出现。本文建立了单腔仿真模型，消除了伪解存在的边界条件，避免伪解的出现。在保证求解精度的基础上，网格数目减少了 62%，总计算时间缩小了 56%，一次性生成色散曲线和耦合阻抗曲线，提高了色散和耦合阻抗的数据处理效率，为高频结构参数优化提供了更有效的途径。采用单腔仿真模型，模拟分析了各结构尺寸对高频特性的影响。

In the simulation of high frequency characteristics of coupled cavity structure, the quasi-period boundary method is usually adapted for its high precision. However, the fake solution exists in the double-cavity simulation model. In this paper, the single-cavity simulation model is proposed and studied. This model eliminate the fake solution and reduces the mesh number by 62% and the total simulation time by 56%, while maintaining the calculation precision. It also provides an effective way to calculate the dispersion characteristics and interaction impedance, which is favorable for the optimization of structure dimensions. The influences of structure dimensions on the high frequency characteristics are also analyzed with this model.