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Rich Fleetwood on Survival & Preparedness - Founded/Established 1997

How-To: Building Your Own Faraday Cage

Source: thereadystore.com

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p>A Faraday cage is an enclosed space with an outer layer that conducts electricity. The physical shape of the Faraday cage does not matter: it can be spherical, cylindrical, or a box. Either the cage itself can be made of a conductive material, or the cage can be built of a non-conductive material such as wood and then covered in a conductive material.

The conductive material can be as simple as several layers of aluminum foil, which makes constructing your own Faraday cage a fairly simple and inexpensive affair.

What are Faraday Cages Used For?
The Faraday cage is designed to guard whatever is inside of it from excessive levels of static and non-static electricity. This can be accomplished either by reflecting incoming electric fields, absorbing incoming fields, or creating opposing electrical fields.

The Faraday cage can help to protect whatever electrical equipment is contained within it from the kind of electromagnetic pulse (EMP), it’s a good practice to keep your emergency electronics such as radios and GPS devices stored in a Faraday cage so they are not incapacitated in the event of an EMP.

How Does a Faraday Cage Work?
Incoming fields are cancelled when the free electrons in the conductive material on the Faraday cage instantaneously realign themselves and block the incident electric field.

For this to work, the cage has to be made from a conductive material; otherwise, the free electrons are not sufficiently mobile to realign themselves. The layer of conductive material can itself be quite thin. This is thanks to the “skin effect,” which is a term that describes the inclination of electrical currents to move mainly on the outer layer of a conductor. Provided that the conductive layer is more than the skin depth of the material, the electrical shielding of the Faraday cage will be outstanding because there will be very high levels of absorption loss.

The skin depth is a function of the material the conductor is made of and the frequency of the incoming wave. Typically, wrapping your Faraday cage in several layers of heavy-duty aluminum foil will give you the needed skin depth to protect your electronics from high-frequency radiated fields like the kind generated by a EMP.

Building a Faraday Cage
The material you use for your Faraday cage does not have much influence on how effective the cage will be at protecting your electronics from high-frequency fields. Virtually any metal has the necessary conductivity to allow free electrons to realign and cancel out incoming electric fields.

Certain metals, are more conductive than others, which gives them a reduced skin depth – for example, at 200 MHz, silver has a skin depth of less than five microns, as compared to aluminum, which has a skin depth of 24 microns at the same frequency. But on a macro scale, that difference is negligible, which is why you can use heavy-duty aluminum foil, instead of far more expensive materials.

Your Faraday cage can have small holes in it, provided they are not too large with respect to the wavelength of the incoming electromagnetic wave. This is why you can also use fine aluminum mesh to build a larger Faraday cage. For example, a 1 GHz wave has a wavelength of 0.3 meters in space.

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Updated: May 19, 2014 — 5:10 pm

The Author

Rich Fleetwood

Rich is the founder of SurvivalRing, now in it's 20th year, author of multimedia CDs and DVDs, loves the outdoors, his family, his geeky skill-set, and lives in rural Missouri, just a few miles from the Big Muddy. Always ready to help others, he shares what he learns on multiple blogs, social sites, and more. With a background in preparedness and survival skills, training with county, state, and national organizations, and skills in all areas of media and on air experience in live radio and television, Rich is always thinking about the "big picture", when it comes to helping individuals and families prepare for life's little surprises. Since 1997, he has provided guidance, authentic government survival history, and commentary on why we all need to get ready for that fateful day in the future, when we have to get our hands dirty and step in to save the day. He is an award winning videographer (2005 Telly Award), has received state and national scholarly recognition (2006 New Century Scholar and All USA Academic Team), and is a natural with computers, technology, gadgets, small furry mammals, and anything on wheels. Rich likes making friends, solving problems, and creating solutions to everyday issues. He doesn't mind mixing things up, when there is a teaching moment ready to happen. As a constitutional conservative, he's staying quite busy these days. The SurvivalRing Radio Show at www.survivalringradio.com will be coming back SOON!

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