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S-parameter results show unphysical behavior for certain frequencies求助

05-08
ADS用EM仿真CPW匹配电路中出现:
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.
我通过很多种方式消除过这个warning。
1.增加mesh密度,
2.调整port,距离,port面
不过后面整体仿真又出现了这个问题,实在不知道怎么解决,这个warning出现后s21和maxgain会偏高有时候会大于0,求解!

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