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Topic: Electromagnetic shielding

	Electromagnetic shielding sheet - Patent 5260128
		The electromagnetic shielding sheet of claim 1, wherein said amorphous alloy flakes have a thickness of from 20 to 60.mu.m, an aspect ratio from 50 to 10,000 and are laminated onto each other to form said alloy layer at a rate of from 200 to 350 g/m.sup.2.
		The electromagnetic shielding sheet of claim 7, wherein said amorphous alloy flakes have a thickness of from 20 to 60.mu.m, an aspect ratio of from 50 to 10,000 and are laminated onto each other to form said alloy layer at a rate of from 200 to 350 g/m.sup.2.
		The electromagnetic shielding sheet of the present invention is a laminated structure having at least one amorphous alloy layer containing soft magnetic Co based amorphous alloy flakes and at least one electrical conductive metal layer.
	www.freepatentsonline.com /5260128.html (3608 words)

	Electromagnetic shielding - Wikipedia, the free encyclopedia
		Electromagnetic shielding is the process of limiting the flow of electromagnetic fields between two locations, by separating them with a barrier made of conductive material.
		Electromagnetic shielding used to block radiofrequency electromagnetic radiation is also known as RF shielding.
		One example is a shielded cable, which has electromagnetic shielding in the form of a wire mesh surrounding an inner core conductor.
	en.wikipedia.org /wiki/Electromagnetic_shielding (724 words)

	About magnetic and electromagnetic shielding solutions.
		Today, we are able to shield both AC and DC magnetic interference, either at the source or at the location of the sensitive component through the use of specially processed Magnetic Shielding Materials.
		When shields need to operate in very high magnetic field environments such as those in close proximity to electric arc furnaces or large superconducting magnets, the saturation of materials is a concern.
		This "buffer" shield and the added attenuation due to the spacing of the air gap should reduce the source field to a level where it is safe to use high permeability materials without the fear of saturation.
	www.amuneal.com /pages/magshield-intro.php (1376 words)

	Harmonization of Shielding-Effectiveness Standards for Enclosures
		Shields function on the basis of two major electromagnetic phenomena: reflection from a conducting surface and absorption in a conductive volume.
		Reflection from a shield results when the impedance of the wave in free space is different from the impedance of the electromagnetic wave in the barrier.
		Because shielding effectiveness is the accepted criterion for assessing the performance of a material or enclosure to attenuate electromagnetic fields, it is important to have standardized test methods to measure it.
	www.ce-mag.com /archive/01/Spring/Ogunsola.html (3205 words)

	Electromagnetic wave shielding panels and wall structure - Patent 5008486
		An improved electromagnetic wave shielding panel and wall structure includes a plate member of electrically nonconductive material and an electrically conductive foil applied to at least one surface thereof, with an electrically conductive net laid on the electrically conductive foil with its fringe portion extending beyond the edge of the plate member.
		This third type of shielding room has a continuous copper foil surface on the surrounding wall, and therefore a decreased impedance field in which the magnetic field is predominant, will induce eddy currents, in the electrically conductive wall to cancel the effect of the arriving magnetic field.
		The net flange portions of the electromagnetic wave shielding panels are laid in the slots so that the net fringe portions extending beyond the edges of one surfaces of the electromagnetic wave shielding panels are separated and electrically isolated from those extending beyond the edges of the other surfaces of said electromagnetic wave shielding panels.
	www.freepatentsonline.com /5008486.html (4093 words)

	Frequently asked questions about mumetal magnetic shielding alloy
		All shielding materials work by diverting the magnetic flux to themselves, so although the field from a magnet will be greatly reduced by a shield plate, the shield plate will itself be attracted to the magnet.
		Magnetic shielding materials offer a very high permeability path for magnetic field lines, directing the electromagnetic energy through the thickness of the alloy, and keeping the electromagnetic field from going where it is not wanted.
		It is important that the shield offers a complete path for the field lines, so that they do not exit the material in a place where they will cause unintended interference.
	www.mumetals.com /faqs.html (1081 words)

	Electro magnetic shielding solutions start with magnetic shields
		Shield calculation formulas do exist to help solve electro magnetic shielding problems, but are usually valid only for theoretical conditions of closed shield shapes and well-described interference fields.
		The attenuation of a magnetic shield is the ratio of the measured magnetic field before shielding to the field measured after shielding is applied.
		For example, if the field before shielding is 450 milligauss, and the field measured inside the shield is 10 milligauss, the attenuation ratio is 450/10 or 45 times.
	www.magnetic-shield.com /faq/calculate.html (554 words)

	TC Shielding manufacture conductive silicones, fluorosilicones, fabric wrap, and other products for use in shielding ...
		Shielding Theory - Basics Electromagnetic compatibility (EMC) refers to the inter-relationship between various electrical/electronic systems within a component as well as the relationship between the component and the electromagnetic environment.
		Shielding When a wave encounters an object some energy will be reflected, some will be absorbed (converted to heat and create residual internal current flow) and a certain amount will leak through.
		Shielding effectiveness is a measure of the attenuation or reduction of energy across a component or test piece.
	www.tcshielding.com (1844 words)

	Electromagnetic shielding of nylon-66 composites applied to laser modules Journal of Electronic Materials - Find ...
		Electromagnetic shielding of nylon-66 composites applied to laser modules was studied experimentally and theoretically.
		In addition, higher electromagnetic shielding was obtained for the composite with higher carbon fibers contents at the same length.
		The EMI shielding effectiveness of polymer composites is related to the aspect ratio of the filler.
	www.findarticles.com /p/articles/mi_qa3776/is_200110/ai_n8969977 (801 words)

	Magnetic Radiation Shielding: An Idea Whose Time Has Returned? - G.Landis (1991)
		The concept of magnetic shielding using superconducting coils for space vehicles was first discussed by Levy [2] and analyzed in some detail in the 1960's and early 1970's [3,4,5,16,17], but was not pursued, primarily because there were no plans for long-duration manned flights which would benefit from such a shield.
		Magnetic radiation shielding received a brief resurgence of attention in the late 1970's, when the concept of large space colonies was introduced by O'Neill, as an alternative to simple mass shielding for the large populations envisioned [6,7].
		A solution proposed by Levy and Janes [10, 11] is a hybrid of the magnetic shield and the electrostatic shield, the "plasma shield." An electrostatic charge is applied to the vehicle (or habitat) shell to repel the positively charged radiation; a magnetic field then prevents the plasma electrons from discharging the vehicle.
	www.islandone.org /Settlements/MagShield.html (2395 words)

	Conductive Concrete and Electromagnetic Shielding (Site not responding. Last check: 2007-09-18)
		Above 40 km, the main weapons effect of a nuclear detonation is the generation of a powerful, destructive electromagnetic pulse (EMP); and the line-of-sight area illuminated by the EMP is continental in scope.
		Shielding is an important systems-immunity, or hardening, measure in which conductive concrete can be of significant benefit.
		They were interested in shielding boxes as well as cables, but the main damage to the equipment of the vintage of the test era was from induced currents on long conductors penetrating equipment areas.
	home.earthlink.net /~hallmark_cl/id5.html (3086 words)

	Electromagnetic Shielding \| alulight international (Site not responding. Last check: 2007-09-18)
		To protect electronic devices and rooms interiors from electromagnetic waves, electromagnetic wave shielding should be used.
		The ability to reflect the electromagnetic energy can be defined by shield effectiveness.
		The shield effectiveness depends on the frequency of the electromagnetic wave and on the electromagnetic properties of the shielding material.
	www.alulight.com /english/products/shielding.htm (293 words)

	Electromagnetic shielding
		Shields made of steel and copper of the same geometry are analyzed.
		The shield with the measuring coil inside is placed between its poles.
		EMF in the coil is measured: in case of DC current in the coil - by ballistic galvanometer (in the moment of switching on), in case of AC current - by use of millivoltmeter.
	www.quickfield.com /courses/toe/eng/lab4.htm (246 words)

	Kemco International - Coatings for EMI/RFI shielding, electromagnetic interference, radio frequency interference, metal ...
		Shielding from EMI/RFI is done for two primary reasons: (1) to keep electronic device from interfering with others and (2) to keep other devices from interfering with yours.
		There are three essential routes to making a shielded plastic enclosure; the polymer can be made conductive by adding fillers, thin metal plates or foils bonded to the enclosure, or the surface of the enclosure can be coated with a conducting film.
		By far, the most common means of shielding an enclosure is to apply a conductive paint to the surface of the enclosure.
	www.kemcointernational.com /newcoatings.htm (721 words)

	EMF Photos - Electromagnetic Field shielding (EMS)
		The proposal was to install shielding on the floor under the carpet and also within a 1.3 metre high partition wall to be constructed adjacent to the window wall.
		Shielding against the window achieved the desired remediation whilst retaining natural light and a pleasant appearance.
		However, to allow installation of the shields, the cabletray and gas main hangers had to be removed in careful sequence, the shielding installed and the hangers replaced.
	www.brookesems.com.au /photos.htm (303 words)

	Conductive Shielding Coating FAQ
		Shielding from EMI / RFI is done for two primary reasons: (1) to keep your electronic device from interfering with others, or (2) to keep other devices from interfering with yours.
		The ideal enclosure for electromagnetic shielding would be a seamless sphere manufactured from highly conductive material, such as copper, aluminum, silver, or gold.
		The conductivity of the copper shielding coatings is significantly greater than the previous two types: 0.075-0.10 ohms/square/mil.
	www.thermospray.com /shieldingfaq.html (1168 words)

	Solve magnetic interference problems with magnetic shields.
		Magnetic Shield Corporation, a division of Perfection Mica Company, is the premier supplier of custom magnetic shields, room and wall EMF shields and magnetic shielding material.
		Magnetic shielding, (also known as magnetic shields, magnetic screens and EMI shielding), prevents magnetic fields from reaching areas where they would cause magnetic interference.
		Magnetic shielding is used around either the source of interference, to prevent electromagnetic radiation from leaving a device; or more typically, around a sensitive device, to prevent the electro magnetic interference from disrupting normal operations.
	www.magnetic-shield.com (334 words)

	Graphite/Conductive-Epoxy Electromagnetic Shielding= LEW16647
		Shielding ability equals that of a larger mass of aluminum.
		Lightweight shields for electromagnetic interference (EMI) can now be fabricated from composites of (1) electrically conductive fibers made of bromine-intercalated graphite in (2) matrices of electrically conductive epoxy.
		However, those shields were not as effective as aluminum shields because of the lack of electrical conductivity in the epoxy (especially in surface layers).
	www.nasatech.com /Briefs/Oct00/LEW16647.html (314 words)

	Materials for EM Shielding (Site not responding. Last check: 2007-09-18)
		With the rapid advances and broad implementation of computer and telecommunication technologies there is increased interest in shielding of electromagnetic radiation, especially in the radio and microwave frequency ranges.
		The usual shielding techniques focus on the use of standard metals and their composites, which have disadvantage due to limited mechanical flexibility, heavy weight, corrosion, and difficulty of tuning the shielding efficiency.
		Conducting polymers are promising materials for shielding electromagnetic radiation and reducing or elimination of electromagnetic interference (EMI) because of their relatively high conductivity and dielectric constant and ease of control of these properties through chemical processing [1].
	www.physics.ohio-state.edu /~ppl/shield.html (491 words)

	EMI Shielding - EMI Shielding Manufacturers > EMI Filter, EMI Testing, RFI Shielding
		Spring gaskets provide long-term durability and reliability, high shielding effectiveness, consistent shielding despite surface irregularities and tolerance variations and are easy to assemble and install.
		EMI/RFI shielding gaskets are the most effective, simplest and most inexpensive method of shielding available, because they prevent the occurrence of slot antennas.
		Shielding effectiveness is expressed as a ratio of electromagnetic signals with and without the shield component.
	www.iqsdirectory.com /EMI-shielding (1666 words)

	Electromagnetic Shielding - Hull-Breach Forums (Site not responding. Last check: 2007-09-18)
		A Faraday cage is a hollow metal conductor that blocks electric fields and/or electromagnetic radiation (light, microwaves, etc).
		The hole size you can have in a shield has to be very small compared to the wavelength of the EM waves you are trying to block.
		They wouldnt have to be completely sealed (radiation shield, just large flat pieces of metal prominating the sides of the ship) would be fine as long as they block most of the light and radation reaching the hull.
	www.hull-breach.com /ipb/index.php?showtopic=1290 (940 words)

	Electromagnetic (EM) Shielding Materials-Gaskets and Seals
		Electromagnetic (EM) shielding can protect against such damage as well as against the leakage of classified electronic communications and high levels of EM signature.
		EM shielding is accomplished by placing an electrically conductive surface between the source of an EM disturbance and the region to be protected.
		This may be achieved by either shielding the EM source, the sensitive facility, or both.
	www.cecer.army.mil /facts/sheets/FL54.html (575 words)

	E1851-04 Standard Test Method for Electromagnetic Shielding Effectiveness of Durable Rigid Wall Relocatable Structures
		However, the shield assembly including all enclosure penetrations shall be completed and required penetration protection devices shall be installed in accordance with the design specification.
		The test method can also be used on existing shielded enclosures after repair work is done to verify workmanship, but it may be necessary to remove equipment or equipment racks to gain access to a test area.
		It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
	www.astm.org /DATABASE.CART/PAGES/E1851.htm (496 words)

	Electromagnetic Interference Shielding With Perforated Metals
		To determine which perforated pattern is best suited for this function, 16 samples of perforated metal were tested at 9 frequency levels and their performance evaluated.
		The test results show that Shielding Effectiveness of 40 dB provides 99.000% attenuation of the electromagnetic (EMI/RFI) radiation while a Shielding Effectiveness of 92 dB, the highest Shielding Effectiveness found in the tests, provides 99.997% attenuation.
		The shielding tests were performed by Dash, Straus and Goodhue, Inc., testing laboratories and are made available courtesy of the Industrial Perforators Association.
	www.azom.com /details.asp?ArticleID=1524 (285 words)

	USATODAY.com - Protect our electronics against EMP attack (Site not responding. Last check: 2007-09-18)
		Such shielding is designed to prevent everyday electromagnetic radiation from entering and/or exiting the device.
		Upgrading to shield against an EMP would entail using more robust shielding materials, especially for the cords, cables, and/or wires that connect devices to external entities such as power supplies or networks.
		Aircraft have even stronger electromagnetic shielding, so they are unlikely to fall out of the sky.
	www.usatoday.com /tech/news/techpolicy/2005-12-18-emp-threat_x.htm (1037 words)

	Magnetic fields interference solved with electro magnetic shielding
		The magnetic field results from a source of magnetic flux, which might be the Earth, a motor, transformer or electric power line, or even a bar magnet.
		Electro magnetic shielding is necessary to isolate sensitive apparatus from these electro magnetic fields.
		The radio frequency range is quite broad, and includes some lower frequencies that can be effectively shielded by magnetic shielding alloys and constructions.
	www.magnetic-shield.com /faq/interference.html (582 words)

	Course #43, Electromagnetic Shielding Engineering for Wired and Wireless Communications
		Both beginners and seasoned professionals will find to their amazement, that shielding is often not at all what they thought.
		The effects of shield non-uniformities will be explained and quantified with regard to important wired and wireless electronic products.
		We will review the shielding standards, shielding system evaluation levels, measurement criteria, and logistics, and detail the shielding measurement triangle: test facilities, and test instrumentation, and test procedure.
	www.cei.se /043.htm (778 words)

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