CST MWS S11曲线低频有波纹

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
（1）The topology of port 1 has changed after adaptive port meshing. This could influence the 3D simulation as well as the port modes
（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
请问这样的仿真结果可行么?想做实物测试。 应如何改进?求大神指导

请学会使用软件的帮助文件。
有波纹说明残余能量过高。CST MWS帮助文件《Time Domain Solver Performance Improvements》。
CST MWS帮助文件《Mesh Problem Handling》：
The topology of port x has changed after adaptive port meshing. This could influence the 3D simulation as well as the port modes.
This case occurs when the port is inaccurately meshed.
Solution:
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).
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

非常感谢您的帮助

有波纹是field energy的原因，和网格无关！

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

能量能不能消散和网格大小多少无关。