[建模]边界条件和激励源2

我现了模型矩形波导和介质层，边界条件设置为y方向为E，x方向为H，z方向为open，背景材料为真空，有两个警告：at least one propagating mod at port 1 is not considered in time domain calculation!it might be better to increase the number of modes at port 1.  j5/pVXO  
some higher propagating modes at port 2 are not considered in time domain calculation.this possibly leads to an inaccurate enery balance.consider to reduce the port size or decr .. ^+D/59I  
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对于Empty Waveguide，CST帮助文件是这么说的： ^$P_B-C N  
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CST MICROWAVE STUDIO® solvers generally allow using more than just the fundamental mode in the waveguide port. This becomes especially important when higher order modes need to be taken into account. P1[.[q/-e  
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The number of propagating modes vary due to the chosen frequency range. As a rule, the number of modes to be considered at a waveguide port should at least be the number of propagating modes, because unconsidered modes will be reflected by the port operator.

谢谢了，能用汉语说说吗？

这点儿英语应该不难理解吧…… J s33S)  
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对于有截至频率的模型，仿真频率很宽或者端口尺寸很大时，就有必要仿真多个模式，否则多余的能量会被端口反射回去，降低仿真的准确性。

有点不懂哎

at least one propagating mod at port 1 is not considered in time domain calculation!it might be better to increase the number of modes at port 1. !1+!;R@&H>  
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今天我也遇到了这个问题，我把波端口改小了就不报错了 `g}en%5b\  
波导口大了，截止频率就低了，如果设置的小一点截止频率就高了，就不用“decrease the upper frequency limit”，不知道是不是这么回事

谢谢指教，明白了。是不是，就是出现了高阶模态？

看不懂啊。。。。

呵呵呵呵呵

我也出现同样问题，求解some higher order propagating modes at part 1 are not considered in time domain calculation,仿真结果没s参量数据？