By 2.5D, I mean the electric current flows on xy planes (assuming the layer
stack is in z direction) except on vias. In those solvers I mentioned, they typically
assume both the ground plane and dielectrics extend to infinity. (Sonnet uses a different
technique assuming the circuit is inside a metal box). Some of the vendors
claim their tools to be "3D plannar" because they sound better. What they
really mean is that tool can handle more complicated cases such as taped
vias rather than restricting to vertical vias only.
I hope this explains it.
-Xingchao Yuan, Ph.D.
Cadence Design Systems, Inc.
> From email@example.com Thu Sep 25 11:00 EDT 1997
> From: "Bob Techentin" <firstname.lastname@example.org>
> Date: Thu, 25 Sep 1997 09:59:53 -0500
> Reply-To: "Techentin, Robert W." <email@example.com>
> X-Mailer: Z-Mail (3.2.1 10oct95)
> To: Xingchao Yuan <yxc>
> Subject: Re: [SI-LIST] : Re: delay lines with PCB traces
> Cc: firstname.lastname@example.org
> Mime-Version: 1.0
> On Sep 25, 10:12am, Xingchao Yuan wrote:
> > Subject: Re: [SI-LIST] : Re: delay lines with PCB traces
> > Michael and Brett:
> > One way to derive a model for the delay lines is to use an 2.5D
> > full-wave Electromagnetic solvers. Commercial available tools
> > include Sonnet from Sonnet Software, MOMENTUM from HP-EEsof,
> > Strata from Ansoft, and IE3D from Zeland.
> What is your definition of 2.5-D? I thought that HP-EEsof Momentum
> was a 2-D Method of Moment Simulator.
> Bob Techentin email@example.com
> Mayo Foundation (507) 284-2702
> Rochester MN, 55905 USA http://www.mayo.edu/sppdg/sppdg_home_page.html