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

Vijay,
Let me also congratulate you on a nice thesis.  It
would be intresting to see it you can still
reduce/shift the resonances if you connect (somehow
almost fuse) the power plane with your grid.  That way
you won't have any floating metal in the stackup.

Regards,
virendra

--- steve weir <weirsi@xxxxxxxxxx> wrote:

> 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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