Based on conformal construction of the physical model in the three-dimensional orthogonal mesh system, an integral-based conformal convolutional perfectly matched layer(CPML) algorithm is given for solving the open port truncation problem when the enlarged cell technique combining with conformal finite-difference time-domain (ECT-CFDTD) method is used to simulate the wave propagation inside a hollow waveguide, and the algorithm has the same numerical stability as the ECT-CFDTD method. For the evanescent wave long-time propagation problems in a waveguide, several numerical simulations are done to analyse the reflection error by conducting sweeps of constitutive parameters of the integral-based conformal CPML. Numerical results show that the integral-based conformal CPML can be used for efficiently truncating the open port of the waveguide.%在正交网格体系中建立物理模型共形描述的基础上,针对采用扩展元胞技术的共形时域有限差分(ECT-CFDTD)方法模拟计算波导器件遇到的开放端口截断问题,给出了积分形式的共形卷积完全匹配层方法,算法具有与ECT-CFDTD相同的数值稳定性.设置不同的完全匹配层的控制参数,对波导中有消逝波存在的情况进行长时间模拟计算,分析共形卷积完全匹配层对消逝波的长效截断能力,分析卷积完全匹配层的截断误差.计算结果显示:积分形式的共形卷积完全匹配层可有效截断波导器件的开放端口.
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