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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Dan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I used the GetDP version compiled with complex PETSc, which also includes the SLEPc eigensolver.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This eigensolver is actually quite fast. Please run this example with the following options:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-solve -bin -pos -slepc <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">or even simpler:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Open Microstripline.pro (not .geo) with Gmsh. Then the right command line options are applied<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">by default. On my notebook the simulation takes about 18 seconds.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Of course you can use the symmetry here to reduce the calculation effort here. (I haven’t used it<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">here because I’m also simulating non-symmetric cases.)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Michael<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></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""> Danny Holstein [mailto:dgholstein@embarqmail.com]
<br>
<b>Sent:</b> Wednesday, December 03, 2014 4:41 PM<br>
<b>To:</b> Asam Michael (IFAG ATV BP D PD DES1)<br>
<b>Cc:</b> getdp@geuz.org<br>
<b>Subject:</b> Re: [Getdp] u-strip RF<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="color:black">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>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">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<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Also, I was curious with regards two issues:<o:p></o:p></span></p>
<ul type="disc">
<li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
You don't apply symmetry along the center line, why not?<o:p></o:p></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
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.<o:p></o:p></li></ul>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="color:black">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<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-family:"Helvetica","sans-serif";color:black">From:
</span></b><span style="font-family:"Helvetica","sans-serif";color:black">"michael asam" <<a href="mailto:michael.asam@infineon.com">michael.asam@infineon.com</a>><br>
<b>To: </b><a href="mailto:dgholstein@embarqmail.com">dgholstein@embarqmail.com</a>,
<a href="mailto:getdp@geuz.org">getdp@geuz.org</a><br>
<b>Sent: </b>Wednesday, December 3, 2014 3:28:23 AM<br>
<b>Subject: </b>RE: [Getdp] u-strip RF<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Dan,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">here is a small example for simulating the impedance and propagation constant</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">of a simpe microstrip line (2D cross-section).
</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Cheers,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Michael</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> getdp [<a href="mailto:getdp-bounces@ace20.montefiore.ulg.ac.be">mailto:getdp-bounces@ace20.montefiore.ulg.ac.be</a>]
<b>On Behalf Of </b>Danny Holstein<br>
<b>Sent:</b> Tuesday, December 02, 2014 9:26 PM<br>
<b>To:</b> <a href="mailto:getdp@geuz.org">getdp@geuz.org</a><br>
<b>Subject:</b> [Getdp] u-strip RF</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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