HFSS邊界條件Finite Conductivity和Impedance有什么不同

Finite Conductivity –A Finite Conductivity boundary enables you to define the surface of an object as a lossy (imperfect) conductor. It is an imperfect E boundary condition, and is analogous to the lossy metal material definition. It is only valid for
good conductors.
既然說模擬lossy conductor ,那還為什么說only valid for good conductors？？？？
還有兩種邊界條件：Finite Conductivity和Impedance有什么不同？

a lossy (imperfect) conductor的話，boundary condition就不能是iperfect E，所以你不能使用默認的邊界條件，必須重新定義。有損耗就應該使用Finite Conductivity。

謝謝！1樓