This article started in 2014, and was revised at the middle of 2015. It is intended to introduce the suRFace roughness effect and different roughness models with ANSYS R16 siwave and HFSS. "Surface roughness" is a very hot topic recently,and there are total six papers to talk about this on DesignCon 2014 and DesignCon 2015. # k9 d3 T2 r: A$ [ ^ 1 ^9 M" m$ W) R, z1 Y7 N 2 o6 Y# @8 l- \* h' R0 N% H