Hi I am a newbie to SI. I have started learning HFSS recently. Here is my problem; I tried to simulate a 2 trace transmission on a pcb. I created two models. One is 10 cm long and the other is 1 cm long. All other dimensions are identical. I am getting a S11 (dB) curve against frequency with bumps for the long line but a continually increasing curve for the short line. Why is this difference?, Which one is more accurate? Can anyone suggest a way to cascade 10 if the small model S parameters to compare it with the long line 0dB| | | **** **** | * * * * | * * * * | * * * * * | * * * * * | * * * * * | * * * | * |* This is for 10 cm line | ___________________________________________________________(f) 0 10 GHz 0dB| | | **** ************ | * | * | * | * | * |* This is for 1 cm line | ___________________________________________________________(f) 0 10 GHz Thanks in advance. PN _________________________________________________________________ Is there a gadget-lover on your gift list? MSN Shopping has lined up some good bets! http://shopping.msn.com ------------------------------------------------------------------ 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 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