[SI-LIST] Re: Height of the shield can
- From: sunil bharadwaz <sunil_bharadwaz@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Sun, 31 May 2009 22:35:27 -0700 (PDT)
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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