[SI-LIST] Re: Height of the shield can
- From: steve weir <weirsi@xxxxxxxxxx>
- To: sunil bharadwaz <sunil_bharadwaz@xxxxxxxxx>
- Date: Tue, 02 Jun 2009 15:40:50 -0700
Sunil, yes reducing Q inside the cavity will alleviate EMI escaping /
entering, as well as reduce the peak amplitude caused by resonant couplings.
Steve.
sunil bharadwaz wrote:
> Hi Steve ,
>
> Thanks for that reply!!
>
> Reducing the Q is for preventing sharp resonances ?
>
> regards
> Sunil.b
>
>
> --- On *Mon, 6/1/09, steve weir /<weirsi@xxxxxxxxxx>/* wrote:
>
>
> From: steve weir <weirsi@xxxxxxxxxx>
> Subject: [SI-LIST] Re: Height of the shield can
> To: "sunil bharadwaz" <sunil_bharadwaz@xxxxxxxxx>
> Cc: "SI LIST" <si-list@xxxxxxxxxxxxx>
> Date: Monday, June 1, 2009, 11:18 AM
>
> Sunil, then your choices are to make the dimensions as small as
> possible, keep components and trace well clear of the edges, do
> what you
> can to reduce Q and hope that is enough.
>
> Steve.
> sunil bharadwaz wrote:
> > HI Steve ,
> >
> > Thanks for that Reply!!
> >
> > I understand that it is best to get it evaluated with a 3D tool.
> > However , I do not have the model for the RF transceiver in any
> format
> > like
> > the spice or verilog or etc ...
> >
> > What we have on the Fr4 PCB is the RF transceiver & its related
> passives
> > along with another mixed signal ic ( again spice model is not
> available)
> > & the over all Power supply related stuff ...
> >
> > regards
> > Sunil.b
> >
> > --- On *Mon, 6/1/09, steve weir /<weirsi@xxxxxxxxxx
> </mc/compose?to=weirsi@xxxxxxxxxx>>/* wrote:
> >
> >
> > From: steve weir <weirsi@xxxxxxxxxx
> </mc/compose?to=weirsi@xxxxxxxxxx>>
> > Subject: Re: [SI-LIST] Height of the shield can
> > To: "sunil bharadwaz" <sunil_bharadwaz@xxxxxxxxx
> </mc/compose?to=sunil_bharadwaz@xxxxxxxxx>>
> > Cc: "SI LIST" <si-list@xxxxxxxxxxxxx
> </mc/compose?to=si-list@xxxxxxxxxxxxx>>
> > Date: Monday, June 1, 2009, 2:04 AM
> >
> > The can will exhibit resonant modes based on its dimensions
> in all
> > three axes. This will affect what leaks in each direction
> at any
> > seams and/or apertures. It will also potentially give you
> > surprise undesirable coupling between elements within the
> can. If
> > you really don't want any surprises you can: Design the can
> to be
> > very small compared to your wavelengths, ie less than a quarter
> > wave on any diagonal, rely on Q suppression techniques, and/or
> > evaluate in a 3D tool like Ansoft, CST etc. Scott McMorrow
> has 3D
> > tools from multiple vendors and does this stuff all day long.
> >
> > Steve.
> >
> > sunil bharadwaz wrote:
> > > Hi ,
> > > I'am trying to design a shield can for an RF Transceiver
> module
> > @ 5.0 Ghz .
> > > I'am trying to figure out the impact of the height of the
> shield can
> > > on the overall performance...
> > >
> > > Is there any specific rule of thumb @ height in terms of
> wavelength.
> > > Meaning ,the impact due to the shield height of Lamda/4 ,
> > Lamda/2 etc ....
> > >
> > > Appreciate any inputs on the above topic ....
> > >
> > > regards
> > > Sunil.b
> > >
> > >
> > >
> > >
> >
> ------------------------------------------------------------------
> > > To unsubscribe from si-list:
> > > si-list-request@xxxxxxxxxxxxx
> </mc/compose?to=si-list-request@xxxxxxxxxxxxx>
> >
>
> <http://us.mc1107.mail.yahoo.com/mc/compose?to=si-list-request@xxxxxxxxxxxxx>
> > with 'unsubscribe' in the Subject field
> > >
> > > or to administer your membership from a web page, go to:
> > > //www.freelists.org/webpage/si-list
> > >
> > > For help:
> > > si-list-request@xxxxxxxxxxxxx
> </mc/compose?to=si-list-request@xxxxxxxxxxxxx>
> >
>
> <http://us.mc1107.mail.yahoo.com/mc/compose?to=si-list-request@xxxxxxxxxxxxx>
> > with 'help' in the Subject field
> > >
> > >
> > > List technical documents are available at:
> > > http://www.si-list.net
> <http://www.si-list.net/>
> > >
> > > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> > > or at our remote archives:
> > > http://groups.yahoo.com/group/si-list/messages
> > > Old (prior to June 6, 2001) list archives are viewable at:
> > > http://www.qsl.net/wb6tpu
> > >
> > >
> > >
> >
> >
> > -- Steve Weir
> > Teraspeed Consulting Group LLC 121 North River Drive
> Narragansett,
> > RI 02882
> > California office
> > (866) 675-4630 Business
> > (707) 780-1951 Fax
> >
> > Main office
> > (401) 284-1827 Business (401) 284-1840 Fax
> > Oregon office
> > (503) 430-1065 Business
> > (503) 430-1285 Fax
> >
> > http://www.teraspeed.com <http://www.teraspeed.com/>
> > This e-mail contains proprietary and confidential intellectual
> > property of Teraspeed Consulting Group LLC
> >
>
> ------------------------------------------------------------------------------------------------------
> > Teraspeed(R) is the registered service mark of Teraspeed
> > Consulting Group LLC
> >
> >
>
>
> --
> Steve Weir
> Teraspeed Consulting Group LLC
> 121 North River Drive
> Narragansett, RI 02882
>
> California office
> (866) 675-4630 Business
> (707) 780-1951 Fax
>
> Main office
> (401) 284-1827 Business
> (401) 284-1840 Fax
>
> Oregon office
> (503) 430-1065 Business
> (503) 430-1285 Fax
>
> http://www.teraspeed.com
> This e-mail contains proprietary and confidential intellectual
> property of Teraspeed Consulting Group LLC
>
> ------------------------------------------------------------------------------------------------------
> Teraspeed(R) is the registered service mark of Teraspeed
> Consulting Group LLC
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx
> </mc/compose?to=si-list-request@xxxxxxxxxxxxx> with 'unsubscribe'
> in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx
> </mc/compose?to=si-list-request@xxxxxxxxxxxxx> with 'help' in the
> Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
> or at our remote archives:
> http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
--
Steve Weir
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
California office
(866) 675-4630 Business
(707) 780-1951 Fax
Main office
(401) 284-1827 Business
(401) 284-1840 Fax
Oregon office
(503) 430-1065 Business
(503) 430-1285 Fax
http://www.teraspeed.com
This e-mail contains proprietary and confidential intellectual property of
Teraspeed Consulting Group LLC
------------------------------------------------------------------------------------------------------
Teraspeed(R) is the registered service mark of Teraspeed Consulting Group LLC
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
