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The concept of radiofrequency (RF) shielding is simple: simply put a barrier between the source of the radiation and the area you want to protect.
Remember to control leakage, such as the gap around the door, switch plates, mounted light fixtures, vents and so on. There are many misconceptions about how radiofrequency radiation penetrates the human body. A Smart meter is a radiofrequency (RF) emitting device that the utility company has installed on your gas or electric meter. An RF reflector will cause the majority of the signal to bounce off, somewhat like a mirror reflects light.
In both cases, SOME amount of RF does get through the shield, as no shield is 100% effective.
Cover enough wall so that the people would be in the protective "shadow" cast by the shield. In a hypothetical world where your Smart meter is the only source of RF radiation, either absorbers or reflectors would work well. Any small amount of Smart meter signal penetrating the reflector will be absorbed by the absorber.
Laminated MW Absorber is a convenient, 48 inch wide film that is very low cost and easy to install. You can cover over your shielding materials with almost any decorative medium that you like.
Very simple and economical device for finding and hearing the harsh bursts of digital microwaves from smart meters. Next, for each “hot spot”, sweep around that immediate area looking for the source of the high field. Starting with the area with the highest field, place the meter in a location which you can find again after shielding is installed. Complicated shapes and multiple barriers in a vehicle may not permit the placement of shielding in all locations that need it. Keep adding shielding until either you are satisfied with the results, or you find that adding more shielding does not yield any further decrease in readings. 5-Lock the shielding material in place so it cannot become a hazard to people and pets, nor create a driving hazard.
Engineers know that you can measure surface resistivity from one point on the surface to another using an ordinary ohm-meter. More consistent results are obtained by measuring the surface resistivity between two bars.
First, let's understand that the magnetic fields from a single conductor wire emanate from that wire in a pattern that could be described as concentric cylinders. Now, understanding that magnetic shielding "works" because it is a better "conductor" of magnetic field lines than air or just about any other material, let's see what happens with 2 different shield designs. In the cross section image at right, we see that the magnetic field lines that would have occurred at the radius of the shield will exist INSIDE the shield. If the edges of the shield are bent slightly TOWARDS the source, the high field area at the edge of the shield will move further away from the "shielded area". In conclusion, for net current, flat (or nearly flat) shielding is more effective for fields from wiring in the area adjacent to the shield. For situations where you have balanced current (that is equal current in the hot and neutral wires), a cylindrical shield can be effective. The safety or danger of a magnetic field from a powerline depends on more than just the strength of the field.
There are probably other factors which determine how much EMF your body can tolerate, such as genetic predisposition, how much exposure you receive at work or school, your age, your exposure to harmful chemicals (pesticides, preservatives, etc.) which may be activated by the EMF, your overall health, and so on. Most important of all, scientists simply do not yet know how much exposure is safe or harmful. While there are official standards for exposure to electric and magnetic fields, they are based on the amount of field needed to cause immediate harm.
What can I do (short of moving and saddling some other poor person with this problem) to reduce my exposure to a powerline outside my window? When it comes to powerlines, the options are limited as you do not have control over the powerlines themselves. Armed with this documentation, your next step should be to contact the utility company that owns the powerlines.
Re-route the power to another line so that less current flows through the line near your home. Should you fail to get assistance for the power company (likely), you may be tempted to consider shielding.
Moving your house further back from the powerlines may be an option, but certainly not a very easy one. Our experience in measuring monitors of all kinds is that one cannot make generalizations about which type or which brand has higher or lower emissions. A few years ago, we took our meters to a large electronics store to try to settle this question. Furthermore, a few months later, we went back and found that almost all the units available were different models.
2- the best advice we can offer is to take your meters to the store and select the best FLOOR MODEL. Compared to magnetic field shielding, shielding a home from cell tower radiation is reasonably straightforward. There are several materials you can use to create the conductive enclosure, depending on your needs and your budget. For doors, walls, floors and ceilings, CuPro-Cote or Y-shield conductive paints offer very good shielding and are very convenient. You can also cover the walls with a conductive fabric such as Pure Copper Polyester Taffeta or ArgenMesh. Remember that the attenuation spec for a shielding material is how much radiation penetrates through the shield. In many ways, RF behaves much like visible light, and RF shielding materials behave much like two sided mirrors. Because RF shields are reflective on both sides, radiation which does leak in will be reflected by the inner surface of the shield, effectively amplifying the amount of radiation in the room.
The trick is to allow this communication to take place, but minimize the amount of radiation that is "wasted" by being absorbed by the user's body. Naturally, the further the phone is from the body, the less radiation is absorbed by the body. Naturally, you will want that shield on the side of the phone that is between the phone and your body.
You can use the shield style that goes right onto the phone, or you can line a pocket or purse with a shielding fabric. Let's say you don't own a cellphone and want to shield your house completely from external signals. I have speakers near my TV (or computer monitor) that are causing distortion (jitter) to the image.
Conventional speakers incorporate both a permanent magnet and an AC magnetic field to produce sound. You will have to use magnetic shielding alloys to shield these magnetic fields and you have a choice of several methods.
Note:Unlike the bucking magnet method, these shielding methods do not alter the sound quality of the speaker.
To achieve maximum aesthetics you will need to be able to open the speaker cabinet and get access to the back of each speaker. Because you will be placing the shielding material in close proximity to this strong magnetic field, you will have to take saturation into account. For the layers closest to the magnet, choose a high saturation material such as MagnetShield.
Wrap the MagnetShield around the speaker magnet (notice that it is attracted to the magnet) in a cylinder shape. Just be careful not to disturb or allow the shield to touch the electrical contacts on the speaker.
If you need maximum field reduction, or cannot open the speaker cabinet, or you simply want to take the easy route, you can simply place flat magnetic shielding alloy between the speaker and the TV. The magnetic fields at the side of the speaker magnet have different characteristics compared to at the back of the magnet, and different shielding materials are required. A high saturation material of significant dimensions such as 36"x15" MagnetShield Plate is required here. The most direct way to reduce your exposure from a laptop is to increase your distance from the device.


Laptops produce at least two types of electromagnetic fields: AC electric fields and AC magnetic fields.
To shield the electric fields from the laptop, use ClearShield or VeilShield Fabric to cover the screen. To shield the magnetic fields we recommend that you form a tray under the laptop with Magnetic Shielding Foil if you will have the laptop near you. If you are using a remote keyboard, you can achieve much higher reduction of magnetic field by making a 5-sided box from Magnetic Shielding Foil. Unlike X-rays, sound, light or bullets, magnetic field lines must travel from the North pole of the source and return to the South pole. Now it is easier to see why a magnetic shield in the shape of an enclosure (sphere, box, tube, etc.) offers much better shielding than a flat shape or partial enclosure. Similarly, if the source of the field is outside of the enclosure, the magnetic field lines will travel through the material of the enclosure on their way back to the source, never finding it more efficient to permeate the air space inside the enclosure. An important consideration when shielding magnets is that the magnets will be attracted to the shielding material. The proper number of layers will depend on the strength of the magnets, the distance between them, and the size and shape of the shield. Again, the proper number of layers will depend on the strength of the magnets, the distance between them, and the size and shape of the shield.
While this is not technically possible, it is possible to distort the magnetic field lines around one pole of a magnet.
For clothing the steel threads aren?t as soft on the skin as thesilver threads of Silver-Jersey or Silver-Knit, it feels like a little scratchy woolen sweater. But keep in mind that in many ways, RF behaves like light and can reflects off of some surfaces… working its way around any shield which is less than a complete enclosure.
Gaps under doors, joints between shield sections, and even pinholes from sewing shielding material can permit these high frequency signals to penetrate.
The subfloor can be painted, or a shielding fabric layer can be applied before the final floor surface is installed. We know that skin, bone, and muscle are excellent absorbers of RF radiation, which is why they will heat up in a microwave oven.
The RF signal emitted transmits information back to the utility company about your gas or electric usage.
It can have very high shielding performance, and in general should be grounded for peak efficiency. Generally, this means that the shield will be placed on the interior surface of the wall adjacent to the Smart meter. Any signal coming from the opposite direction will have to pass through the absorber, then reflect off the reflector, and finally pass through the absorber again before it re-enters the living space. Even cars with gasoline engines can have high levels, depending on the wiring configurations and the locations of the tires and other moving engine parts relative to the passengers. This will not help you determine the “hot spots” and therefore the location of the offending sources of the field. Naturally, the true source may be hidden under the floor, behind a panel, or on the other side of the firewall. You may need to measure its position relative to landmarks in the car, such as bolts, wires, etc. For simplicity, two parallel bars of equal length are placed exactly 1 length apart on the surface to be measured.
As you can see from the image below, the magnetic field lines which intersect the flat shield will be compressed into the shield, leaving less magnetic field on either side of the flat shield. But the magnetic field from a powerline varies from moment to moment depending on how much current is flowing in the wire at the time. They might come from underground wires, ground mounted transformers, or even common sources within the home. Some research has shown that harmonics (higher frequency fields), radio-frequency signals in the line, and power spikes may have more to do with health effects than just the normal 60 Hz magnetic field. Some research shows that exposure during sleep may be more harmful than exposure during waking hours as it affects the melatonin balance which is a hormone that, among other things, fights cancers cells. Recent research has shown that the corona field around high tension lines can ionize the air around the lines.
There is plenty of evidence to show that biological effects occur at levels well below the standard limits. The first step should always be to record readings of the magnetic field strength over a period of a few days using a reliable AC Gaussmeter to find out if you truly have a problem.
Make sure you carefully survey every proposed location for your house to make sure the fields are actually sufficiently lower at the new location that you are considering.
This is a device which constantly monitors the incoming field and produces an equal and opposite cancellation field.
Then expose yourself to that unit for a short while to determine if YOU have any symptoms to it.
Some materials are more appropriate for walls and ceilings, while other are better for windows. Apply the fabric as you would a wallpaper, remembering to overlap slightly at the seams to avoid leakage. But because shielding materials are conductive, be very careful to avoid allowing them to come into contact with electric wires to avoid a shock hazard.
There are several styles of cellphone shield which block the emitted radiation on one side of the phone. Because the room is still filled with the microwaves emitted by the phone, exposure is not eliminated, and of course there is no benefit to others in the room.
Or maybe you have a secure area (such as a hospital, data center, prison, or movie theater) and you want to prevent incoming or outgoing calls. Keep in mind that with magnetic fields, you can either shield the source of the offending field, or shield the thing(s) that you wish to protect. There, you will find a donut shaped magnet, proportional in size to the size of the speaker, over which you will place a cup shaped shield. This material has the ability to "absorb" the initial blast of the field without saturating and becoming useless, but it will only give a limited attenuation.
This outer layer will "absorb" much of the field which has evaded the first layer and yield a very high degree of attenuation.
The material is thick enough to provide good shielding, but still can be cut with a scissors and shaped by hand. Before removing the adhesive backing, cut and shape the material just like the first layer, but on top of the first layer. Take this into account when considering where your speakers will be positioned relative to the TV. On each speaker, place the foil flat against the side of the speaker cabinet which faces the TV, or place it against the side of the TV. If your speakers cabinets are small, you can cut the 36"x15" sheet in half to get two 18"x15" pieces. This will protect the monitor from external fields produced by the speakers and any other sources.
Use a remote keyboard (not a wireless type!!) and place the laptop as far away as you can while still being able to view the screen. Unlike the way a lead shield stops X-rays, magnetic shielding materials create an area of lower magnetic field in their vicinity by attracting the magnetic field lines to themselves. Under usual circumstances, they will travel through air, which by definition has a permeability of "1". A source within the shield will produce field lines which will travel through the air immediately surrounding the North pole until they reach the shield. For these reasons, enclosing either the source of the field, or the thing(s) that you wish to protect from the field, offers the most effective use of the shielding material, and is usually the most cost efficient as well!
Simply stack enough layers between the 2 magnets until the attraction to the shield balances the repulsion between the magnets.
The shield does not need to be in contact with its respective magnet, but it must be held fixed in position relative to its magnet. Remember to think about the magnetic field lines as travelling through the shield more easily than through air. The attenuation for the mirror is very high, perhaps 120 dB or more, so basically no light comes through the mirror. Be sure to caulk and gaps or cracks prior to painting so that you have a continuous, unbroken painted surface. If the floor in already installed, you can lay shielding fabric, and cover it by a large area rug or sheet linoleum.
In this simple experiment, we wish to find out how well skin can shield radiofrequency radiation.


It can be assumed that thicker skin, and more complete coverage, would result in even greater shielding.
Think about the Smart meter emissions as coming from a light bulb located at the meter, and the shield casting a shadow.
In this example, the majority of the bedroom area is protected, but that is not true for the rest of the living space. Electric or hybrid vehicles can have very high levels due to the high current demand and re-charging mechanisms.
It is important that the meter position be repeated in exactly the same position (before and after shielding), as changing the meter position will change the readings. But this method yields very inconsistent results, especially with surfaces that are not perfectly homogeneous. This ionized air has been thought to attract and concentrate radio-active particles and automotive pollutants that can be harmful. Remember that the field will vary according to how much current (not the voltage) if being carried by the powerline. Any areas that are not conductive, even cracks under a door, will allow radiation to leak in. You can paint over the conductive paint with a standard latex paint to achieve the desired color and to protect the conductive surface. Also remember to provide proper grounding to each component which is not in contact with the others.
When you place your mirror shield over the window, you get a dramatic attenuation of the light. Of course, if you hold the phone in your hand, or in a pocket or purse near your body, you have not reduced your exposure, only transferred it from your head to another part. The AC magnetic field is only present when the speaker is activated, and varies in frequency and strength with the pitch and volume of the sound produced. Note that attenuation will be greatest close to the speaker magnet, where the field is strongest (most interfering) anyway. A good, inexpensive way to check for shield performance and the best position for the shield is to use a Pocket Magnetometer. Note: There will be a position somewhere between the back of the speaker magnet and the front of the TV which will yield "near perfect" shielding.
Covering the keyboard area of the laptop with a shielding fabric such as High Performance Silver Mesh will reduce electric fields from these areas while still allowing you to see the keyboard.
Another option is to use a remote keyboard and increase the distance from the laptop to your body. But if a material with a higher permeability is nearby, the magnetic field lines, efficient creatures that they are, will travel the path of least resistance (through the higher permeability material), leaving less magnetic field in the surrounding air.
Then traveling through the shield, they will emerge into the air surrounding the South pole and back to the source. You can paint over the shielding paint with any color of latex paint to achieve any appearance you like.
Every vehicle will have multiple sources of magnetic field, some of which may be in areas that are difficult to access for shielding. It doesn't matter how long the bars are, since longer bars will be placed proportionally further apart.
Notice also, that the magnetic field lines are more concentrated near the wire, and less concentrated as the distance to the wire increases. So the only way to know how strong the field is at a given distance, AT ANY PARTICULAR MOMENT, is to measure it with a gaussmeter. Either field alone could be within tolerable limits, but could possibly exceed tolerable limits when combined.
One rule of thumb that is used by some experts is that you should limit your exposure to 60 Hz magnetic fields which are in excess of 2.5 mG. Also, remember that the only relevant readings are those taken where people actually spend time. Make sure to use your gaussmeter to survey all homes you are considering, to avoid jumping from the frying pan into the fire.
For each active cancellation system, an engineer must visit your location and custom design and install a system that takes into account the size, location, and strength of the offending source(s) and the dimensions of the area you want protected. Keep in mind such additional factors such as: durability, corrosion resistance, toxicity, ease of installation, appearance, and size.
The attenuation specification for the mirror is very high, perhaps 120 dB or more, so basically no light comes through the mirror. But the extent to which leakage of light occurs around the perimeter determines how far from total darkness you will achieve in the room. But there is a big problem: cellphones can operate very nicely with only a very small fraction (less than 1 millionth) of a normal signal. The magnetic field from the two sources can deflect the electron beam in a cathode ray tube monitor (TV) causing distortion of the image, sometimes called jitter (and possible damage to the equipment).
Cut the material which extends backward at several locations so you can bend these "tabs" inward to form the "bottom of the cup" shape.
You can get additional attenuation by using multiple layers of foil, especially if you use a spacer (such as cardboard) in between the layers. Move either towards the speaker or towards the TV from this point and you will loose shielding effectiveness.
Traveling through the low permeability air outside the shield does not offer any efficiency advantage! This means that if you "shield" one pole of a magnet, you are basically relocating the place where those magnetic field lines emerge into air. You could also use a shielding fabric such as Nickel Copper RipStop or AL60 behind the wall. However, you can shield your body and your living space to minimize the amount of RF exposure you receive. In such a situation, if you use a reflecting material, it will reflect on BOTH sides, and you could end up increasing the amount of RF in your living space. Use screws, pop rivets, tape, glue or any other mechanism you can think of to keep the shielding material in place.
The resistance measured between the two bars in Ohms is the resistivity of the surface in Ohms per square! There is not a lot of scientific evidence to support this recommendation, but it is based on the Swedish recommendation for exposure to ELF fields from computer monitors. High readings up close to the powerline are meaningless if the field inside your house is low. To achieve a reasonable degree of shielding, you would have to create a metal vault around your house, using thick metal plates with no windows. Therefore be sure to check the position with a Pocket Magnetometer or digital DC Gaussmeter. On the other hand, if you use an absorber, it will absorb on BOTH on both sides, so you cannot increase your exposure.
Check all areas that will be occupied by passenger bodies, including the seat, head, and floor areas. Naturally, some situations may require shielding of both the back and the sides of the speaker cabinet. Granted, the amount of illumination is less than standing in full sunlight, but the attenuation is nowhere near 120 dB. If you have an electric or hybrid vehicle, you should have an assistant drive the vehicle while you make meter readings. If your largest piece of shielding is not wide enough, you can place pieces next to each other, with 1-2 inches of overlap where they meet. Placing magnetic shielding material around your body is possible, but again not very practical. Check during the various modes of power: electric only, gas only, accelerating, cruising, braking, etc.
The display model had a black bezel (plastic frame), but we wanted the gray one so we took a boxed unit OF THE SAME MODEL, but with gray bezel. Granted, the amount of illumination is less than standing in full sunlight, but the attenuation is no where near 120 dB.




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