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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 20:53:28 +0000
Message-ID:	<CAM2RGhSDK0u6HhkKwscmFukW4_ZWQWAvHBXuK1C_ypgy4GNRPA@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 think we should have that any way but actually direct export from
pcb to this format is more viable.
1. We don't want to export the whole geometry for most cases just some
area of the board users select
2. We might want to composite packages into the geometry we hand
openems. at microwave frequencies packaging on chips adds insertion
losses and etc and the chassis construction can effect things too. For
this reason I am curious if we should actually go from pcb to another
tool that has a 3d geometry kernel to add the other parts.
3. Hyperlynx has as far as i can find no public documentation. We
might try writing the author of the conversion utility but even still
can anyone think of a tool they want to use pcb with other than this
one that uses hyperlynx?

> Kind regards,
>
> Bert Timmerman.



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

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