Before we all get too hung up on this the values are verry small - this could be an issue of numerical noise in the tool. I suggest you rescale the model to say 10x your existing size and re-run the problem. Just check the tool operation first.. Chas -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of fname lname Sent: Saturday, September 08, 2001 2:40 PM To: si-list@xxxxxxxxxxxxx; Raymond.Anderson@xxxxxxx Subject: [SI-LIST] non-negative off diagonal capacitive matrix elements ?? Hi Folks, I have a question. Should the coupling coefficients in the maxwell capacitence matrix always be in the descending order going down along a column or can the coupling between the 2nd and 3rd element be greater than between the 1st and 2nd element. Any help is greatly appreciated. Thanks, Signal Guy. -- >I've just extracted the RLGC matrices for 5 coupled >striplines using Apsimtech RLGC. > >As expected, the diagonal elements of the capacitive matrix are >positive capacitance values. All the off-diagonal elements are >negative EXCEPT one. Is this correct. It has been a while since I've >thought about this, but I was under the impression the capacitive >off diag element were all negative. Anyone know for sure ?? > >The element in column 1 row 5 is the one I question: > > > 3.1600e-15 > -4.9360e-16 3.2540e-15 > -2.0080e-17 -4.8990e-16 3.2540e-15 > -1.3380e-18 -1.9820e-17 -4.8990e-16 3.2540e-15 > 3.1280e-20 -1.3380e-18 -2.0080e-17 -4.9360e-16 3.1600e-15 > > > > >-Ray > >------------------------------------------------------------------ >To unsubscribe from si-list: >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >For help: >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > >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 > > > Get 250 color business cards for FREE! http://businesscards.lycos.com/vp/fastpath/ ------------------------------------------------------------------ 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 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 ------------------------------------------------------------------ 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 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