Momentum 仿真 warning怎么处理

--- WARNING -------------------------------------------------------------------
S-parameter results show unphysical behavior for certain frequencies.
Cause: - inaccurate (high frequency) calibration ;
- electrically large via using lumped model ;
- higher order modes at the ports ;
- slot mode at coplanar ports ;
- grouped strip-slot ports ;
- mesh density is too coarse.

 

我也出现这样的错误了，一直没搞明白
仿真完了后，S21居然还有正数！
与平时仿真没什么区别，看那英文资料也没弄懂！

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