Traditional multipactor prediction method based on plane approximation is fast but inaccurate,which cannot meet the electrical performance design requirements when devices become more and more complex.The finite difference time domain algorithm is one of the most popular methods in the computational electromagnetics.The particle tracing algorithm is a numerical method based on the Newton's force law.The two algorithms can be self-consistently combined by the discrete mesh in both time and space domains,which can be used to predict the multipactor breakdown threshold. In addition, the conformal and parallelizing technologies were well studied. Multipactor breakdown of classic microwave device was analyzed by the developed algorithm. The error is 0.3 dB compared with the experiments and the maximum parallel efficiency is 83%, which demonstrate the accuracy and efficiency of the algorithm.%为克服传统微放电阈值预测方法建模粗糙、精度低的缺点,提高阀值预测精度和效率,研究了基于时域有限差分的精确微放电阀值预测算法.基于时域有限差分算法和粒子追踪算法,通过时空网格自洽互耦实现复杂结构微波器件微放电阈值准确计算.其中,共形和并行算法是提高微放电仿真精度和效率的关键.文章基于空间蛙跳策略实现了基于时域有限差分的微放电仿真算法,利用算法分析了典型微波器件的微放电阈值,仿真与实验结果吻合良好,误差小于0.3 dB;同时,并行效率最高可达83%,验证了算法的准确性和高效性.
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