[SI-LIST] Re: Height of the shield can
- From: sunil bharadwaz <sunil_bharadwaz@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Tue, 2 Jun 2009 11:17:37 -0700 (PDT)
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>/* wrote:
>
>
> From: steve weir <weirsi@xxxxxxxxxx>
> Subject: Re: [SI-LIST] Height of the shield can
> To: "sunil bharadwaz" <sunil_bharadwaz@xxxxxxxxx>
> Cc: "SI LIST" <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
> >
> >
> >
> >
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--
Steve Weir
Teraspeed Consulting Group LLC
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(707) 780-1951 Fax
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