[SI-LIST] Re: Thesis (Eliminating package resonances due to standing waves)

Ray, I think that you see that up around 6GHz. The thesis as I understood 
it was not to eliminate resonance per-se, but to move it up in frequency to 
a region where there is little excitation energy.  I think it was a good 
Master's project, but don't see much practical value.

Regards,

Steve.
At 10:18 AM 6/27/2005 -0700, Ray Anderson wrote:
>And a 3rd question: IF the 'screen' isn't at RF ground, might it not
>have some interesting resonances of it's own at frequencies removed from
>the plane resonance frequencies where it might radiate?
>
>-Ray
>
>Raymond Anderson
>Senior Signal Integrity Staff Engineer
>Product Technology Department
>Advanced Package R&D
>Xilinx Inc.
>
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On Behalf Of Grasso, Charles
>Sent: Monday, June 27, 2005 10:08 AM
>To: 'vijayis@xxxxxxxx'; 'si-list@xxxxxxxxxxxxx'
>Subject: [SI-LIST] Re: Thesis (Eliminating package resonances due to
>standing waves)
>
>Congratulations on a nice presentation.=20
>First a question: As I understand it, your technique
>is to add a 40mils thick piece of copper in a "screen"
>inbetween the planes.?
>OK a second question (!) - I assume that the screen is NOT
>connected to either of the planes.?
>
>Best Regards
>Charles Grasso
>Senior Compliance Engineer
>Echostar Communications Corp.
>Tel:  303-706-5467
>Fax: 303-799-6222
>Cell: 303-204-2974
>Pager/Short Message:  3032042974@xxxxxxxx
>Email: charles.grasso@xxxxxxxxxxxx; =20
>Email Alternate: chasgrasso@xxxxxxxx
>=20
>
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On
>Behalf Of Vijay B
>Sent: Friday, June 24, 2005 5:15 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Thesis (Eliminating package resonances due to
>standing
>waves)
>
>
>Hello,
>  I recently graduated with an M.S in EE from State University of New
>York at
>Binghamton. My thesis was in eliminating package resonances due to
>standing
>waves formed due to propagation and reflection of radial waves in
>between
>power and ground planes. I would like to share the presentation with the
>list.
>
>                     We incorporated a metal screen in between the power
>and
>ground planes of a board to act as a distributed capacitor arrangement.
>We
>used Speed2000 to model the setup and we confirmed simulations with
>measurements on a hardware model using a vector network analyzer. We
>concluded that with this approach we can eliminate all resonances due to
>standing waves upto 10 GHz (may be even higher) on a 4"X5" board by
>incorporating a screen of appropouriate dimension and a dielectric with
>low
>dielectric constant. If anyone is interested in the topic please go to
>http://bingweb.binghamton.edu/~bj95053/ and open the file "Thesis
>Presentation". It is a power point file. If you have any questions or
>comments on this I would be happy to hear from you.
>
>Thanks.
>
>Regards,
>
>Vijay
>
>--=20
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