警告信息

警告：some higher or der propagating modes at port 1 are not considered in time domain calclulation .  This possibly leads to an inaccurate energy blance. Consider to increase the number of modes or decrease the upper frequency limit.

由于频率设置较高，波导端口产生了高次模，应该在设置端口时增加所考虑的模数。

我没考虑这个问题，我试试

或者将频率范围缩小，所设置的频率范围在波导的截至频率范围之内