CST MWS端口是否必須緊貼模型表面設置么？

RT，在端口設置的時候會有兩個距離選項，當仿真出現3 grindlines(/read-htm-tid-81152.html)的錯誤時，我改變了Zpos，就可以進行仿真了，但我不知道這樣做與緊貼模型表面設置有什么區別，麻煩各位指教一下。

參照端口的幫助文件吧，這兩個距離的意義是不一樣的

我的cst幫助文檔不能用，麻煩能發一個么

幫助文件200M。沒辦法。

幫助文件《Waveguide Port》
Free normal position: Please activate this button to define an internal port, i.e. a port location inside the calculation domain. This check button is only enabled for a Free or Full plane transversal range setting (see above).
The value for the normal position can be inserted in the correspondingX/Y/Zpos text field.
Note: Deactivating this button will always locate the port on the lower or upper boundary of the calculation domain, corresponding to the definition of the lower or upper port orientation.

Distance to ref. plane: Specifies the distance to your reference plane to obtain the correct phase information for the S-parameters (deembeding). Positive values move the reference plane outwards, negative inwards. The deembeding can also be performed after the calculation run. See Results S-Parameter Calculations Deembed S-Parameter.... The picture below shows a waveguide port with negative distance to the reference plane, i.e. the reference plane is moved inwards.

好的，謝了！我再仔細看看