2007-04-13 12:23:40 · 8 answers · asked by Ejsenstejn 2 in Science & Mathematics ➔ Engineering
The answer depends upon whether your objective is to reflect or absorb the EMI in your effort to create a shield (the distinction can be quite important in your overall design), and the frequencies of interest. Aluminum, steel and copper alloys all have somewhat different characteristics and serve better for one application or another.
At most frequencies, aluminum -- *especially* the thin stuff, isn't all that great at absorbing EMI, and if you need to keep the RF from *escaping* from your design, you'll find it tends to bounce the RF around until it finds a seam somewhere else to escape. On the EMC side, if you're trying to protect your gear from inbound EMI, it can serve better in that fashion.
On the other hand, steel will do a better job of absorbing EMI than aluminum at most frequencies, allowing you to push it to an earth ground through well bonded steel parts.
To the poster above --you're correct about the copper tape -- even the silver tape that EMI engineers use isn't aluminum. It's tin plated copper.
2007-04-13 18:56:11 · answer #1 · answered by C Anderson 5 · 0⤊ 0⤋
Rf Shielding Aluminum Foil
2016-10-19 04:44:10 · answer #2 · answered by ? 4 · 0⤊ 0⤋
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RE:
Is aluminum foil good for shielding EMI?
2015-08-10 09:02:50 · answer #3 · answered by Timothy 1 · 0⤊ 0⤋
No, the permeability of aluminum is not good enough. It will shield to some extent, but not quite as effective as something with a high permeability like ferrous materials or Mu metal.
2007-04-14 05:13:31 · answer #4 · answered by turd 2 · 0⤊ 0⤋
Its Ok but there are much better products that are used, and surrounded by 2 layers of twisted ground braiding creating a EM drain where crosstalk might be a problem as well as EMI.
here are some popular Em shielding products>>>
http://www.lessemf.com/mag-shld.html
2007-04-13 13:22:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋
No it's really bad.
Tin foil (made of real tin, not aluminium) or copper foil work well.
Electronics Engineers buy sticky copper tape to shield the gaps in boxes.
2007-04-13 12:51:29 · answer #6 · answered by anotherbsdparent 5 · 0⤊ 1⤋
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I think you partly answered your own question; I've done it with good, heavy-duty aluminum foil wrapped around the wire.
2016-04-07 05:20:03 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Excellent . To make it really effective use many layers separated by small air gaps.
2007-04-13 12:27:29 · answer #8 · answered by squeezie_1999 7 · 0⤊ 1⤋
Can be but if the field is very strong it will melt the aluminium.
2007-04-13 12:37:26 · answer #9 · answered by mad_jim 3 · 0⤊ 1⤋