<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: times new roman,new york,times,serif; font-size: 12pt; color: #000000'>Michael,<br><br>Thank you so much, I especially like the comments you added.<br><br>I did try unsuccessfully running the problem and it appears the solution doesn't converge on my machine with the following messages:<br><blockquote id="DWT274">Info : GetDP - 998 2.3177217e+05 8.5152840e-01<br>Info : GetDP - 999 2.3162576e+05 8.5099048e-01<br>Warning : GetDP - Iterative solver has iterated too many times<br>Info : GetDP - 1000 2.2645535e+05 8.3199446e-01<br>Info : GetDP - 1000 Iterations / Residual: 275968<br>Info : GetDP - Arpack required 50 iterations<br></blockquote>Also, I was curious with regards two issues:<br><ul><li>You don't apply symmetry along the center line, why not?</li><li>Wouldn't
seeding the solution with the solution to the DC case (freq = 0.) speed
up resolution significantly? I imagine e sub t could be specified, with h
sub t similarly based on the DC current into a 50 ohm load.<span style="white-space:pre"></span></li></ul>Another consideration with regards seeding, the non-transverse fields will be very small (zero) starting at freq=0; if we swept the frequencies the field solutions to the lower frequency should always work well for the next, with the non-transverse increasing beyond when higher order modes become possible (the point at which we wouldn't be interested in using u-strip anyway).<br><br>Regards,<br>Dan<br><br><blockquote></blockquote><br><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"michael asam" <michael.asam@infineon.com><br><b>To: </b>dgholstein@embarqmail.com, getdp@geuz.org<br><b>Sent: </b>Wednesday, December 3, 2014 3:28:23 AM<br><b>Subject: </b>RE: [Getdp] u-strip RF<br><br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Dan,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">here is a small example for simulating the impedance and propagation constant</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">of a simpe microstrip line (2D cross-section).
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">Cheers,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US">Michael</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D" lang="EN-US"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> getdp [mailto:getdp-bounces@ace20.montefiore.ulg.ac.be]
<b>On Behalf Of </b>Danny Holstein<br>
<b>Sent:</b> Tuesday, December 02, 2014 9:26 PM<br>
<b>To:</b> getdp@geuz.org<br>
<b>Subject:</b> [Getdp] u-strip RF</span></p>
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<p class="MsoNormal"><span style="color:black">All,<br>
<br>
Has anyone done the formulation for the RF characterization of microstrip? DC is clearly in the examples, but I don't see a microstrip formulation with determination of impedance and phase velocity (beta) in the frequency domain.<br>
<br>
Regards,<br>
Dan</span></p>
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