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From:	"Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Fri, 26 Aug 2016 20:56:05 +0000
Message-ID:	<CAM2RGhRST_sQQR8O9-Ti1=XytAxTFhxAV5MtMuvaq9OUwSRC=A@mail.gmail.com>
Subject:	Re: [geda-user] Microwave PCB layout simulation or How to eat all
	your processing power in 3 easy steps
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On Fri, Aug 26, 2016 at 7:45 PM, Bert Timmerman
(bert DOT timmerman AT xs4all DOT nl) [via geda-user AT delorie DOT com]
<geda-user AT delorie DOT com> wrote:
> Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>>
>> So a while back there was a thread titled "[geda-user] Wilkinson
>> splitter - how to implement and use?"
>>
>> I *hated* that we didn't have a good answer for that. I spent a lot of
>> time looking at FEM (finite element modeling). There are a lot of open
>> source FEM solvers that are open source. Too many really because
>> people keep writing new ones to full fill phd thesis requirements.
>>
>> The FEM we care about is called FDTD (finite-difference time-domain)
>> aka Yee's method. I made a list of all of them. Removed the ones that
>> are not maintained. Weighted them based on how close to our intended
>> use case the projects were and bumped down ones that were basically
>> only used by the universities who wrote them. It left 2 options. I
>> really favor OpenEMS for a number of reasons. For one MEEP doesn't
>> seem to have any kind of email list or forum and OpenEMS does. For
>> another MEEP seems to mostly be used by people who are doing things
>> like designing CCDs and other optics (hey John Dotty ever used this?).
>> OpenEMS is mostly used by RF people and has examples done that use PCB
>> layout.
>>
>> To see what I am excited about
>> http://openems.de/index.php/Tutorial:_Microstrip_Notch_Filter
>>
>> http://openems.de/index.php/Tutorial:_Importing_with_hyp2mat#Calculating_the_step_response
>>
>> OpenEMS
>> http://openems.de/start/index.php
>>
>> MEEP
>> http://ab-initio.mit.edu/wiki/index.php/Meep
>>
>> PS: I looked for a Method Of Moments (mom) solver and there don't
>> appear to be any which are open source and actively
>> developed/maintained. NEC2 is nice but it is just free as in beer.
>>
>>
>>
>
> Hi Evan,
>
> So basically you wish for a Hyperlynx exporter for pcb ;-)

I was hoping for some wisdom from the crowd too. I am not a microwave
dark artist and we have a resident phd in physics who might have a
thing or two to say.

Igor2 and I were talking about it last night. We got really excited
about FEM solvers but does anyone here really want / have the ability
to use this?

> Kind regards,
>
> Bert Timmerman.



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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