[SI-LIST] Re: effects of stitching vias last attempt- without attachment
- From: Matthew Severini <Matthew.Severini@xxxxxxxxx>
- To: scott@xxxxxxxxxxxxx
- Date: Wed, 28 Nov 2012 13:59:35 -0500
Scott,
Thanks for your rapid response. I am using HFSS as a modeler. I have about
1/4 inch of stripline on either side of the via to ensure that the signal
does not have any port induced higher order modes when it hits the via.
( this means my board ends up being a 1/2" square). Then I have an air box
that is about a 1/2" cube with the board centered in the z- dimension, and
a radiation boundary on the surfaces of the air box. (in the x/y plane this
box is exactly the same size as the board) I think this means that any
energy that gets to the edges of the ground plane is radiated out, but any
energy trying to radiate in the z-direction sees the real world
air/dielectric boundary. I wanted to use a radiation boundary on the edges
of the board because the size of the board I used is arbitrary, and I don't
think that I want the plane resonances caused by this size to affect my
results. I am using a wave port and a terminal soulution. I did a modal
solution to ensure that the ports were properly sized, and did not have any
resonances.
Thanks again,
Matthew Severini
Research & Development Engineering
Endicott Interconnect Technologies, Inc.
Phone: (607) 755-8119
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