关于S参数分析组的疑惑

- June 28, 2023 at 2:53 pm
  
  zjh
  Subscriber
  
  老师您好，请问我在使用官网案例的时候，发现提取的T结果和abs(S21)^2 总是会相差0.4左右的差距，这是为什么呢？
- June 28, 2023 at 4:24 pm
  
  Guilin Sun
  Ansys Employee
  
  这个S21是从哪里得到的？如果是在折射率不是1的材料，比如基底，因为要满足1+r=t, 当r大于零是，t大于1，而且S21 提取的是电场某个分量，因此，就会出现这是情况，参见
  Ansys Insight: 透射率反射率大于1，或者透射率反射率之和大于1的原因与解决方案–综合贴
  当然此时不能直接用abs(S21)^2来评价透射率，而是要添加折射率比，可以找一下参考书看看，或者根据1+r=t推导一下。
- July 4, 2023 at 1:04 pm
  
  xudong Zhang
  Subscriber
  
  孙老师说的很清楚了，abs（S_21）^2应该是电场的透射率乘以磁场的透射率，可惜我上传不了图片，不然我这边有我之前跟你一样问题解决掉的ppt。
  - July 4, 2023 at 1:23 pm
    
    zjh
    Subscriber
    
    嗯嗯呢感谢已解决，我加入折射率比后就一样的了

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