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RF absorbing sheet materials? (5GHz)

  1. Jun 20, 2016 #1

    berkeman

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    Has anybody used thin RF absorbing sheets or tiles to attenuate RF radiation off of PCB assemblies? I've seen it used many years ago, and I have a 5GHz application that I'd like to try an absorbing sheet on. The PCBA is a few cm on a side, and the sheet or sheets would be applied directly on the side(s)....
     
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  3. Jun 20, 2016 #2

    berkeman

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    This is one of the sheets that I've requested samples of to try out...

    http://www.wavexorb.com/products/product_details.php?PN=SN075-081&lang=en [Broken]
     
    Last edited by a moderator: May 8, 2017
  4. Jun 20, 2016 #3

    davenn

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    Also the sheets / pieces of black foam that is used for anti-static protection of IC's is brilliant for that use

    I have even used wedge shaped sections in the end of waveguides on 5 and 10 GHz as a dummy load

    Dave
     
  5. Jun 20, 2016 #4

    berkeman

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    Huh! I didn't think of that. I have anechoic chamber time scheduled for the end of this week, and will try anti-static foam as an option. That would be WAY cheaper than the commercial sheets. Thanks brother! :smile:
     
  6. Jun 20, 2016 #5

    davenn

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    no probs ... when I looked at that link you gave I wasn't really sure if it was for the same / similar sort of stuff or not ?
     
  7. Jun 20, 2016 #6

    berkeman

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    It looks like they can tune their sheets for particular frequencies. I'm not sure how they do it, but that's a nice feature. I want low loss in the 2.4GHz-2.5GHz band for 802.15.4 comm, but good loss around the 5GHz second harmonic band where we are having regulatory issues (for out-of-band harmonic energy).
     
  8. Jun 22, 2016 #7
    I second the black foam, it's what our systems use, no idea what it is exactly, but I'll see what I can find out, I know they operate in the 850MHz to 1GHz range.
     
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