[SI-LIST] Rs in W-element

Dear all
          I have a question about W-element in Hspice. When I use
W-element presented by RLGC Matrix,
the matrix parameter looks as below
.MODEL singleline W MODELTYPE=RLGC, N=1
+ Lo = 3.149855e-07
+ Co = 1.061570e-10
+ Ro = 2.745859e+00
+ Go = 0.000000e+00
+ Rs = 1.166330e-03
+ Gd = 6.225371e-12
 
In Hspice manual description, the resistance with skin effect is 
R(f)=Ro+(square_root f)(1+j)Rs
For different frequency there should be different resistance
performance.
However, even I simulate with very high frequency (several Ghz), the
loss of the transmission line is the same. 
I have set the INCLUDERSIMAG=YES, and also modify Rs to a big value. The
loss never changes. 
How could this happen? Is there some setting I missed? 
 
terence
 
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