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alpha434 |
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My member number is no coincidence. ![]() ![]() ![]() ![]() Group: Members Posts: 3,154 Joined: 16-December 05 From: Denver, CO Member No.: 5,280 Region Association: Rocky Mountains ![]() |
Alright. How do I make it?
I have a source for the ferro-fluid. I just don't know how to get it to bond into a paint. And I'm sure someone here knows. I'll just bet Clayton shows up here and says he's got a 55 gallon drum in his basement. (IMG:style_emoticons/default/KMA.gif) |
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TonyAKAVW |
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That's my ride. ![]() ![]() ![]() ![]() Group: Members Posts: 2,151 Joined: 17-January 03 From: Redondo Beach, CA Member No.: 166 Region Association: None ![]() |
So there are a couple ways to absorb RF. First is to absorb the magnetic field component and the second is to absorb the electric field portion (since microwaves are electro-magnetic waves) While I don't know what ferrofluid would do, the idea of using iron filings suspended in paint could work. At least two companies manufacture H-field (magnetic field) absorbers using this. One of the common applications of this is to reduce the tendency of a metal cavity to resonate. You'll see the stuff applied to the top of the cavity. Its called flexible ferrite...
The other method using carbon is commonly used for absorbing propogating waves. Carbon loaded foams are used to line the walls of anechoic chambers for testing antennas, etc. Black ESD foam is a form of carbon loaded foam. There are different types of carbon loaded foams, with varying carbon-profiles and densities. Tuning the thickness of thees can help absorb narrow ranges of microwave frequencies. So you can actually buy paints that are microwave absorbing, but to have maximum benefit it will need to be applied thick. If you want to make your own, go buy some carbon black powder and mix it in with paint. I suggest carbon because its less prone to rust (IMG:style_emoticons/default/smile.gif) And as other said, make sure to remove or coat any reflective surfaces. If it reflects light, it will probably reflect RF. Also things inside your car can cause reflections as well. Paperclips or any metallic element would be about the worst thing you could do. Think of what planes do for countermeasures... They eject a cloud of reflective metal pieces. Metal is reflective. Radar works on reflections (IMG:style_emoticons/default/smile.gif) -Tony |
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