I have this one: "The Transmission-Line Modeling Method TLM" by Christos Christopoulos = (ISBN 0-7803-1017-9) Cheers, Chris Padilla Cisco Systems San Jose, CA -----Original Message----- From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = On Behalf Of Lars Juul Sent: Tuesday, May 15, 2007 5:24 AM To: shlepnev@xxxxxxxxxxxxx; richardg@xxxxxxxxxxxxxxxx Cc: si-list@xxxxxxxxxxxxx Subject: [SI-LIST] Re: TLM: Laplace and discrete difference equations Yuriy and Richard, Which books on the TLM method would you recommend for = application-oriented people wanting to implement their own TLM code? So far I identified: "Electromagnetic Analysis Using Transmission Line Variables" By Maurice = Weiner (ISBN 981024438X) "Die "Transmission Line Matrix" (TLM) Methode im Zeitbereich" By Ulf = M=FCller (ISBN 3817115164) Thanks in advance, Lars Juul 2007/5/14, Yuriy Shlepnev <shlepnev@xxxxxxxxxxxxx>: > > Richard, > > There are no universal recommendations on the step and area sizes. It=20 > depends on multiple details of the algorithm and implementation such=20 > as the boundary condition approximation, type of basis functions or=20 > order of the local approximation. You have to investigate the=20 > dependency of the characteristic impedance from the step size and from = > the area size to get an idea on accuracy. It is called convergence=20 > study. Fix the area size for instance and solve the problem multiple=20 > times with different grids (keep the same high accuracy for the=20 > iterative solver or use a direct solver). Plot the impedance vs. step=20 > size - it will give you rough idea on the method convergence from the=20 > step size. Use a geometry with known answer to validate your solution=20 > and to estimate accuracy (an ideal 50-Ohm strip line for instance). =20 > Richardson's extrapolation can be used sometime to find the=20 > convergence limit and to estimate the accuracy for complex geometries=20 > without comparisons. > In general, the convergence study and comparisons with results=20 > obtained analytically or with other methods are essential steps to=20 > validate a field solver algorithm and to find balance between accuracy = and performance. > > Best regards, > Yuriy Shlepnev > Simberian Inc. > http://www.simberian.com/ > > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx=20 > [mailto:si-list-bounce@xxxxxxxxxxxxx] > On > Behalf Of Richard Georgerian > Sent: Sunday, May 13, 2007 11:05 AM > To: si-list@xxxxxxxxxxxxx > Subject: [SI-LIST] TLM: Laplace and discrete difference equations > > Greetings All, > I have been reading some books on transmission line modeling and one=20 > of the things that interest me was the Laplace equation. The material=20 > explains Laplace using the discrete difference equations, creating the = > boundary conditions and the incremental steps. The area that I don't=20 > fully understand is how to determine the size of the incremental step=20 > size and how large the area of interest should be when calculating an=20 > impedance for a stripline for example. Since this is an iterative=20 > process to calculate the voltages and charges, the larger the area and = > smaller the step sizes will increase the time to convergence. So with=20 > difference step sizes or different boundary dimensions that gives=20 > different results (to within a tolerance), how do I determine those=20 > step sizes or boundary dimensions? > > Many thanks in advance. > > > Richard > EMC2007 Arrangements > > 2007 PSES Symposium Chair > > 2007 PSES Web site: http://www.ewh.ieee.org/soc/pses/symposium/ > > 2007 PSES Symposium date: 22-23 October 2007 =3D=3D=3D=3D=3D Richard = > > Georgerian Compliance Engineer NewsFlex Ltd. > > "...turning the world one page at a time..." > > Web site: http://newsflex.net > > email: richardg@xxxxxxxx > > =3D=3D=3D=3D=3D > > > > > -- Binary/unsupported file stripped by Ecartis -- > -- Type: application/ms-tnef > -- File: winmail.dat > > > ------------------------------------------------------------------ > 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.net > > 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 technical documents are available at: > http://www.si-list.net > > 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 technical documents are available at: http://www.si-list.net 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 technical documents are available at: http://www.si-list.net 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