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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 18:40:38 +0000
Message-ID:	<CAM2RGhT_pQZ8CGGM6ECwDUwJHeo3UwDJ6d_7RtVWhxJBQ=K1tA@mail.gmail.com>
Subject:	[geda-user] Microwave PCB layout simulation or How to eat all your processing
	power in 3 easy steps
To:	gEDA users mailing list <geda-user AT delorie DOT com>
Reply-To:	geda-user AT delorie DOT com

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.


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

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