求問(wèn)CST MWS系統(tǒng)部分尺寸差別太大時(shí)如何處理？

需要在一個(gè)橫截面1X1m長(zhǎng)20m的波導(dǎo)里插入一根長(zhǎng)1dm的天線，直接模擬的話天線尺寸與波導(dǎo)相差太大，網(wǎng)格的最大尺寸比太大，計(jì)算極慢，請(qǐng)問(wèn)大俠們?cè)趺唇鉀Q。本人新手，求說(shuō)得詳細(xì)一下，多謝！

或者如何設(shè)計(jì)一個(gè)球面波源，跳過(guò)天線的模擬過(guò)程

試試看subgridding吧。

1dm？1cm？可以直接用離散端口代替天線

我按照教程進(jìn)行了局部網(wǎng)格的劃分，選了subgridding，但是出了錯(cuò)如下，怎么查在哪兒出了錯(cuò)呀：
Subgrid mesh generation
Local mesh settings overlap for the shapes "single dipole/PEC:Driven Element" and "component1:solid2".
Using settings of shape "single dipole/PEC:Driven Element" within overlaping areas
Starting adaptive port meshing.
Mode calculation for port 2:
At least one propagating mode at port 2 is not considered in the time domain calculation! (At least one mode shares the same beta with considered mode(s) -> degeneration).It might be better to increase the number of modes at port 2. More...
Pass 1 successfully completed.
Adaptive port meshing finished.
Matrix computation (PBA)
Hexahedral mesher terminated abnormally.
Error in calculating solver matrix
Solver run aborted.
2 warnings occurred.

做了個(gè)模型，其中有根天線尺寸特別小，劃分了局部網(wǎng)格，選了subgridding，出了錯(cuò)如下，可能是哪里出了錯(cuò)??？

Subgrid mesh generation
Local mesh settings overlap for the shapes "single dipole/PEC:Driven Element" and "component1:solid2".
Using settings of shape "single dipole/PEC:Driven Element" within overlaping areas
Starting adaptive port meshing.
Mode calculation for port 2:
At least one propagating mode at port 2 is not considered in the time domain calculation! (At least one mode shares the same beta with considered mode(s) -> degeneration).It might be better to increase the number of modes at port 2. More...
Pass 1 successfully completed.
Adaptive port meshing finished.
Matrix computation (PBA)
Hexahedral mesher terminated abnormally.
Error in calculating solver matrix
Solver run aborted.
2 warnings occurred.

上傳模型，請(qǐng)大神們指導(dǎo)，跪謝！

為了大神們看的方便，再上傳一個(gè)有結(jié)果的：

我的模型在這里 能不能幫忙看下錯(cuò)在哪兒，多謝多謝！ 1

直接在1mX1m的面上加離散端口嗎？出來(lái)的可以近似是球面波？