CST MWS關于staircase mesh的問題
用CST仿真螺旋天線時經常會出現“XXX mesh cells are represented in staircase mode and have been filled with PEC”的warning，有什么好的辦法可以解決這個問題呢?如果直接網格加密，就會使得總的網格數目過大。
還有一個問題就是mesh type 中的staircase是什么意思呢?看幫助文件也沒有看太懂。當我把mesh type 改為staircase后仿真時出現Line impedance adaptation is deactivated for staircase mesh的warning，哪位達人能解釋一下呢?
如果沒有短路的話就不是大問題，所以這個信息只是warning而不是error。
"xxx" mesh cells are represented in staircase mode and have been filled with PEC/PTC.
"yyy" mesh faces are represented in staircase mode and have been filled with PEC/PTC.
Depending on the chosen hexahedral solver this warning might appear. It means that within a mesh cell or a mesh face a certain geometrical configuration cannot be used to run the solver correctly. Therefore these cells or cell faces are filled with PEC or PTC depending on the chosen problem type. However, in many cases these filled cells do not influence the simulation results significantly. The staircase based cells can be seen in the mesh view.
Solution:
Please make sure that the mesh is not too coarse at locations where the staircase based cells appear.
Depending on the chosen problem type, please activate the "Use TST cells" checkbox if provided in the "Mesh Properties - Hexahderal->Specials...->Advanced" dialog box.
CST MWS幫助文件《Mesh Problem Handling》。
關于第二個問題，不知道你看的是哪個幫助文件，是《Staircase Mesh》這個嗎?Stairecase mesh通常用于表面結構（surface structure）或者導入但無法修復（imported shape that cannot be healed）的模型。
如果模型設置了波導端口，默認情況下，瞬態求解器會在仿真之前在端口區域使用網格優化計算準確的line impedance和場模式，但此功能不支持staircase mesh。
CST MWS幫助文件《Special Solver Parameters - Waveguide》。
Line impedance adaptation before solver run: Activates the adaptive port meshing feature to automatically calculate a more accurate line impedance and mode pattern. For this purpose the port mode solver runs several passes while adaptively refining the port mesh.
Accuracy: Represents an accuracy limit for the relative error of the line impedance. The adaptive port meshing is finished when the line impedance has not changed more than this value for two following passes or the maximum number of passes is reached.
Max. number of passes: Restricts the number of passes in the adaptive port meshing if the port line impedance takes too long to converge.
謝謝您的回答，我再驗證一下
