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