[Getdp] u-strip RF

Danny Holstein dgholstein at embarqmail.com
Wed Dec 3 16:40:54 CET 2014


Thank you so much, I especially like the comments you added. 

I did try unsuccessfully running the problem and it appears the solution doesn't converge on my machine with the following messages: 

Info : GetDP - 998 2.3177217e+05 8.5152840e-01 
Info : GetDP - 999 2.3162576e+05 8.5099048e-01 
Warning : GetDP - Iterative solver has iterated too many times 
Info : GetDP - 1000 2.2645535e+05 8.3199446e-01 
Info : GetDP - 1000 Iterations / Residual: 275968 
Info : GetDP - Arpack required 50 iterations 

Also, I was curious with regards two issues: 

    * You don't apply symmetry along the center line, why not? 
    * 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. 

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). 




----- Original Message -----

From: "michael asam" <michael.asam at infineon.com> 
To: dgholstein at embarqmail.com, getdp at geuz.org 
Sent: Wednesday, December 3, 2014 3:28:23 AM 
Subject: RE: [Getdp] u-strip RF 

Hi Dan, 

here is a small example for simulating the impedance and propagation constant 
of a simpe microstrip line (2D cross-section). 


From: getdp [mailto:getdp-bounces at ace20.montefiore.ulg.ac.be] On Behalf Of Danny Holstein 
Sent: Tuesday, December 02, 2014 9:26 PM 
To: getdp at geuz.org 
Subject: [Getdp] u-strip RF 


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. 

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