Hi Terence, I'm not sure how did you check the loss property of the transmission = line. Actually there are many ways to verify the skin effect induced = loss increment in high frequency range.=20 For example, you may extract the S parameters of the W element. Then you = may see eig(S*S') decreases as frequency goes up, which means the system = becomes more and more lossy as frequency increases. Hope this helps, Jinghua -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = On Behalf Of TerenceHsieh@xxxxxxxxxxxx Sent: 2005=C4=EA12=D4=C222=C8=D5 15:38 To: si-list@xxxxxxxxxxxxx Subject: [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=3DRLGC, N=3D1 + Lo =3D 3.149855e-07 + Co =3D 1.061570e-10 + Ro =3D 2.745859e+00 + Go =3D 0.000000e+00 + Rs =3D 1.166330e-03 + Gd =3D 6.225371e-12 =20 In Hspice manual description, the resistance with skin effect is=20 R(f)=3DRo+(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.=20 I have set the INCLUDERSIMAG=3DYES, and also modify Rs to a big value. = The loss never changes.=20 How could this happen? Is there some setting I missed?=20 =20 terence =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: =20 //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu