[运算]CST MWS S11曲线低频有波纹

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S11 曲线 低频出现抖动 有波纹 仿真是没有出现错误 但是出现了两个警告 8o%Vn'^t  
（1）The topology of port 1 has changed after adaptive port meshing. This could influence the 3D simulation as well as the port modes B?8*-0a'[  
（2）Some higher order propagating modes at port 1 are not considered in time domain calculation. This possibly leads to an inaccurate energy balance. Consider to increase the number of modes or decrease the upper frequency limit X0P +[.i  
请问这样的仿真结果可 .. i]k)wr(  
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请学会使用软件的帮助文件。 J2x}@p  
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有波纹说明残余能量过高。CST MWS帮助文件《Time Domain Solver Performance Improvements》。 MQw}R7  
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CST MWS帮助文件《Mesh Problem Handling》： @R`6jS_gK  
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The topology of port x has changed after adaptive port meshing. This could influence the 3D simulation as well as the port modes. O0'|\:my  
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This case occurs when the port is inaccurately meshed. ? Pi|`W   
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Solution: cOdRb=?9  
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If mesh type "PBA" is selected, please consider using "FPBA" with "Enhance FPBA accuracy" (Mesh Properties->Specials...->Mesh type). The problem may also appear when the mesh density in the port region is insufficient to capture all geometric detail. In this case, a higher mesh resolution could solve the problem (Mesh Properties->Specials). 7NT} Zwf  
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第二个提示本身已经告诉你可能的解决方案了。

有波纹一般是网格设置的问题，你把网格设置得再小点试试！

非常感谢您的帮助 x%$6l  
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非常感谢您的帮助 obbg#,  
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weclon0726:有波纹一般是网格设置的问题，你把网格设置得再小点试试！ (2015-04-29 09:51)  9~r8$,e  

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有波纹是field energy的原因，和网格无关！

hefang:有波纹是field energy的原因，和网格无关！ (2015-04-29 15:46)   s{T6qJ  

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不是网格设置的太大，然后能量消散没到设定值就停止了吗

weclon0726:不是网格设置的太大，然后能量消散没到设定值就停止了吗 (2015-04-29 17:58)  QVo>Uit   

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能量能不能消散和网格大小多少无关。