Electronics > RF, Microwave, Ham Radio

RF shielding enclosures

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VSV_electron:

--- Quote from: radiolistener on May 16, 2024, 07:49:49 am ---...Such things are explained in books about shielding theory, include formulas, so you can estimate your case.

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Please name the books with references if possible.

VSV_electron:

--- Quote from: pdenisowski on May 16, 2024, 02:15:47 pm ---...
I spent years (professionally) tracking down interference to and from all kinds of electronic devices, and I can tell you from experience that there are a lot of nominally "shielded" devices that leak RF in or out like crazy (and vice-versa). 
...

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I perfectly understand what you say and to be honest I somewhat regret (perhaps not the best description of my feelings but anyway, sort of) that I got myself started with the RF even at the preliminary level when I can still back off.
There is so much art and science involved in this particular electronics area that it's really scary and it feels like walking in the dark with a flashlight. However it is so intriguing that it's hard to let it go.

VSV_electron:
One more thing I want to ask:
Suppose for the experimental RF boards I use double sided RF4 copper sheet and the components are mounted on top of the board while the bottom is made the common (or is it better leave it completely isolated ?) - In that case I suppose the bottom is considered shielded? I don't think the thickness of the copper layer on standard FR4 board is what makes it a good RFI shield compared to a say 0.3 mm copper sheet but since in this thread it's been already suggested to use the 'double sided copper clad boards' for making DIY shielding I suppose it works somehow.

radiolistener:

--- Quote from: VSV_electron on May 16, 2024, 03:33:21 pm ---Please name the books with references if possible.

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You can read my post here to see how to estimate it in short:
https://www.eevblog.com/forum/rf-microwave/stainless-steel-as-an-absorber-of-emi/msg3082975/#msg3082975

If you want more details, you can look for the book Gooch & Daher "Electromagnetic Shielding and Corrosion Protection for Aerospace Vehicles"

David Hess:

--- Quote from: VSV_electron on May 16, 2024, 02:07:28 pm ---
--- Quote from: David Hess on May 16, 2024, 01:51:58 pm ---For single projects, I like to use double sided copper clad board because it is easier to work with than thin metal sheet.  Otherwise any thin metal sheet that you can work and solder to is acceptable.
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Would you say that for the amateur experimental boards like we are talking about here there is no point to overthink the shielding process? I mean - one of course has to do his best in closing all the gaps with the enclosure but the particular metal parameters don't matter much? Is that what you mean?
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That is what I mean.  Mostly we are concerned with electromagnetic shielding and any conductor will work for that.

After copper clad board is cut, it is easy to sand and file the edges to make them straight and of the proper dimension.  Thin metal sheet is more difficult to work with.

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