[SI-LIST] Re: RF Shiled

Though it is difficult to design an optimum shielded enclosure with so little 
information about the contents or the design criteria, you can find some 
helpful information at 
http://www.cvel.clemson.edu/emc/tutorials/Shielding02/Practical_Shielding.html. 
If you want a shielded enclosure that works at high frequencies, then aluminum 
is fine. Keeping the size of the enclosure small so that the circuitry fills 
the volume will help to damp enclosure resonances and you'll need to pay close 
attention to the filtering at all shield penetration points.

Are you sure you need a shielded enclosure? An electric-field shield above the 
high-frequency components may be more appropriate. If you need low-frequency 
(kHz) magnetic-field shielding, you'll need to use a magnetic material.

Todd 

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of sunil bharadwaz
Sent: Tuesday, March 24, 2009 1:38 PM
To: SI LIST
Subject: [SI-LIST] RF Shiled

Hi ,
We are designing a Power Amplifier board @ 5.0 Ghz.We want design a shield
for that.

The plan is to space the holes on the shield  with spacing less than lambda/20.

How do we ensure that the shield it selves does not become a resonant cavity
at that frequency ?What is the best material used for shield (Aluminum ...etc) ?

Pls point me to any further relevant info in this regards.

regards
Bharadwaz.Sunil



      
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