GB2479351A - Magnetically lossy cover for apertures through an electromagnetic shielding wall - Google Patents
Magnetically lossy cover for apertures through an electromagnetic shielding wall Download PDFInfo
- Publication number
- GB2479351A GB2479351A GB1005673A GB201005673A GB2479351A GB 2479351 A GB2479351 A GB 2479351A GB 1005673 A GB1005673 A GB 1005673A GB 201005673 A GB201005673 A GB 201005673A GB 2479351 A GB2479351 A GB 2479351A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cover
- apertures
- aperture
- shielding wall
- shielding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0018—Casings with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0041—Ventilation panels having provisions for screening
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/28—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder dispersed or suspended in a bonding agent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
- H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
- H01F1/375—Flexible bodies
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention relates to magnetically lossy covers 3 for covering apertures 2 in a shielding wall 1, where the covers provide 3 effective suppression of electromagnetic field propagation through the aperture 2 into the shielded area. The invention is suitable for operation within the microwave and millimeter range above 1 GHz up to 30GHz. The cover is made from nonconductive material with significant magnetic losses and does not require galvanic contact with the main shielding wall. The shielding cover material can be made from a composite, where carbonyl iron particles having a diameter of between 1 and 5 micrometers, are embedded in a thermoplast polymer matrix, such as a polyamide. Alternatively the cover can be made from ferrite powder embedded in a thermoplast polymer. The material may have a loss tangent exceeding 0.2 over the range 1-20GHz. The shielding remains effective even when air gaps are present, and can be in multiple pieces to construct a cover with variable geometry (figures 3-5).
Description
Title: LOSSY COVER FOR APERTURES THROUGH A SHIELDING WALL
Background of the invention
EM shielding is increasingly important for high frequency electronic systems with intent to reduce both non-intentional emissions and EM interference susceptibility of such systems (for further background and state of the art in electromagnetic shielding see e.g. S. Celozzi, R. Araneo and G. Lovat, Electromagnetic shielding, Wiley&Sons, New Jersey, 2008; X.C. Tong, Advanced Materials and Design for Electromagnetic Interference Shielding, CRC Press, Taylor & Francis Group, Boca Raton, 2009).
Shielding effect is due to the field distribution for a hollow object with conductive walls, as can be obtained by solving Maxwell equations for such geometry. Shielding enclosures or similar assemblies are thus generally composed of walls with high conductivity, by this forming the so called Faraday cage system. However, high shielding efficiency can be significantly reduced by any discontinuities in the shielding assembly. This includes gaps or apertures, with the largest dimension of the aperture determining the frequency at which the shielding effect becomes significantly reduced. Nevertheless, openings are frequently required for the normal operation of the shielded electronic system, e.g. openings for cables or gaps at individual part of the shielding assembly.
Unused intentional apertures are usually closed with additional shielding covers that are conductively connected to the main shielding assembly, whereas gaps are prevented/eliminated by a range of shielding elements like metallic spring fingers or conductive elastomer gaskets. Such shielding elements must be installed correctly in order to obtain their optimal performance, but this can be labor intensive and hence expensive. Also, the repetitive opening and closing of the shielding cover can cause, over time, excessive wearing of the shielding element and occurrence of gaps, which can degrade shielding effect. Therefore frequent maintenance is required.
Further problem with apertures for the cables is that often much larger aperture has to be provided in order to pass through cable with plug, which can be generally much larger than the cable diameter. This thus results in the problem of designing such an opening firstly to be sufficiently large for cable plugs to be passed through with ease while, on the other hand, to be sufficiently small to maintain an adequate shielding effect. In practice, openings which are originally designed to be large enough for cable plug are frequently subsequently reduced in size by covers which have to be fitted after a cable has been passed through. However, this involves additional material costs and assembly effort.
Application of prior-art shielding covers or elements for aperture or gaps (e.g. US 2003111248, US 4577054, US 6207893, EP 0618763, EP 0557896, US 3830954, US 4358632, US 4677253, US 5184793, WO 9322815, EP 0584658, EP 1510844, US 6713672, WO 0237920) typically means that the shielding enclosures are generally not versatile, in that they allow no or only limited additional design modifications. Thus it is necessary either to manufacture a large number of differently configured and dimensioned shields or to perform a costly upgrade to satisfy widely varying requirements for the enclosures.
Accordingly, it is desirable to provide a more versatile system for providing shielding of apertures through the shielding enclosure, which overcomes drawbacks of the prior art.
On the other hand, use of the absorbing materials for suppression of interferences and noise (e.g. Advanced Materials and Design for Electromagnetic Interference, 2009; patent JP 2004 103840) or as a gasketing element (e.g. patent US 6429370; patent US 5847316) is already well known. Here, absorbing material interacts with electromagnetic fields and due to the magnetic or dielectric losses
dampen the field propagation. However, the
applications are limited to planar electromagnetic wave absorbers, interference suppression inside cavities or as gaskets in combination with standard shielding structures.
Summary of the invention
An object of the presented invention is to provide a cover element for one or more apertures in shielding enclosures where the cover element exhibits a good shielding effect over a wide range of frequencies (typically above 1 GHz up to 30 GHz), involves only a small amount of assembly effort to set-up correctly, and does not require a galvanic contact with the main shielding body (enclosure). An object of the present invention is also above mentioned cover element for the apertures in shielding enclosures that has also a smaller secondary aperture for required input/output connections and potentially allows adjusting according to required final aperture (e.g. cable diameter). The cover element, as presented in this invention, can be applied on the outer side of the shielding enclosure, on the inner side of the shielding enclosure, or on both sides simultaneously.
Tn accordance with the invention the cover element consists of a single piece or multiple pieces made from non-conductive or conductive material that exhibits in bulk significant magnetic losses in the operating frequency range (magnetic loss tangens over 0.1, preferably over 1), and possibly with significant dielectric losses (dielectric loss tangens over 0.1). The single-piece or assembled cover element is placed directly on the shielding enclosure over one or several apertures, with shortest free path of propagation of electromagnetic field through the lossy material at least 1/10th of wavelength in the material, preferably more. Another possibility is placing the cover element on the shielding enclosure over the aperture with additional layer of non-conductive, lossless material (e.g. air gap or rubber gasket), with thickness of this layer preferable below 1/50th of wavelength in the material as thickness affects the shielding effect of the cover element. When placing the cover it is preferred to cover all edges of the original aperture in the enclosure wall and not leaving an opening since such opening can degrade the effect of the lossy cover even if the dimensions are too small for efficient radiation in the operating frequency range.
Basis of the invention is interaction of the magnetic field with material with magnetic losses where energy of the field is converted into internal energy in the material. The effect is volumic and is not dependant on surface currently like with Faraday cage. Magnetic permeability of the material with magnetic losses enhances concentration of the magnetic field inside the material and hence exhibit field suppression effect also when there is no direct contact with the conductive surface or air gaps or additional apertures are still present. Preferable placement of the lossy cover element near the conductive, shielding enclosure surface, where the magnetic field is largest enhances interaction of the lossy cover and the magnetic field. Due to the lossy interaction there is significantly reduced possibility of resonances at specific frequencies for the case of incomplete shielding enclosure, as is the case with conductive shielding enclosures based on the Faraday cage.
Another embodiment of the invention is a cover made from several different materials with significant magnetic losses in separate layers or separate pieces of the assembly.
Another embodiment of the invention is a cover where one or several different materials with significant magnetic losses are combined with conductive materials or other materials with no significant magnetic losses, where main function of the material with magnetic losses is to suppress propagating EM wave through the material. This allows optimization of magnetic field interaction and suppression in the cover together with additional requirements like mechanical properties of the cover or sealing.
Tn accordance with the invention the cover element can have one or several apertures for e.g. cables, with each of these apertures (secondary apertures) smaller than the original aperture in the enclosure, and its dimensions sufficiently small to prevent direct radiation through this aperture in the desired operating frequency range. This allows easy passing of the cables through the enclosure without significant degradation of the shielding effect due to the aperture, and, in contrast to prior art solutions, is very insusceptible to the aging or degradation due to the operation wear.
Another embodiment of the invention is an assembly of multi-piece lossy cover for the enclosure aperture, where the position of the pieces can be adjusted arbitrarily to form one or more secondary apertures with required dimensions. This allows flexible forming of the secondary apertures in the single aperture cover for enclosures according to the actual requirements, for example passing through the enclosure wall a cable with plug larger than the final aperture.
Another embodiment of the invention is an assembly of multi-piece lossy cover for the enclosure aperture, where the pieces are formed to allow easy joining with minimal possibility of incorrect positioning (Figure). This eliminates the possibility of reduced shielding effect due to poor assembly, use or maintenance.
Brief description of the drawings
For better understanding of the invention several examples of specific embodiments to the present invention will be described by referring to the accompanying drawings: Figure 1 shows a wall of a shielding enclosure 1 with an aperture 2 in the wall. A cover 3 from magnetically lossy material with area larger than the aperture in the wall is put over the aperture thus completely covering the aperture.
Figure 2 shows similar example where cover 3 has secondary apertures 4 that allow direct path through the enclosure wall, but have too small dimensions for efficient radiation in the operating frequency range.
Tn Figure 3 a cover 3 with a separate piece of cover 5 are shown, where the cover piece 5 can form with cover 3 a secondary aperture or can be completely removed. This allows passing through the secondary aperture of objects with features larger than the final aperture.
Figures 4 and 5 show examples where pieces of the cover (5 and 3) have specific forming (6 and 7) that allow easy joining of the pieces, prevent incorrect positioning and/or eliminate the need for the additional elements for fixing in place.
Detailed description of the invention examples
Here we present several detailed examples of embodiment of the invention. These examples should merely be regarded as for understanding the invention, and not as a limitation to field of use. It will be apparent to one skilled in the art that the present invention can be practiced without using the specific details, and hence the present invention is not limited to the examples as other embodiments can be done by one skilled in the art within the scope and spirit of the invention.
Furthermore, the term "comprising" or "comprises" when used in this detailed description and in the claims to indicate included features, elements or steps, is in no way to be interpreted as excluding the presence of other features, elements or steps than those expressed or stated.
First example of the embodiment of the invention is a cover for an aperture in the shielding enclosure that is made from the material with significant magnetic losses in the 1-20 GHz frequency range, and exhibits good shielding effect even without galvanic contact with the enclosure or with 0.2 mm or less air gap present between cover and the enclosure, as shown in Figure 1. The cover is made in one piece, with dimensions of the cover being 3-5mm larger that the dimensions of the aperture in the enclosure and thickness of 2 mm or more. Material of the cover is a composite where carbonyl iron particles (diameter 1-5 micrometers) are embedded in the thermoplast polymer matrix like polyamide. Such composite material exhibit significant imaginary component of the magnetic permeability t and thus magnetic losses in the 1-20 GHz frequency range with tangens of loss angle tan ömagn =-Im(p)/Re(p) exceeding 0.2 in the whole range. Cover is attached to the enclosure by clamp, self-adhesive layer or other method of temporary or permanently fixing the cover.
Another example of the invention is a cover for an aperture, made from a composite material with significant magnetic losses in the 0.5-8 GHz frequency range and properties as in the previous embodiment. The composite material is made from ferrite powder (diameter 5-15 micrometers) embedded in the thermoplast polymer, made in one piece, with dimensions 3-5 mm larger than the aperture and thickness 2-3mm.
Another example is a cover from magnetically lossy composite material, made from several pieces, as shown in Figure 2, with similar properties as in the first two examples. The pieces of the cover assemble together to form full cover or can form a cover with one or several secondary apertures, which are smaller that the original aperture in the enclosure. Such cover can be disassembled to get e.g. cable with plug through the cover and assembled again with minimal secondary aperture (e.g. diameter of the cable), and fixed to the shielding enclosure.
Further example of a multi-piece cover from the previous example is where one or more pieces of the cover can be positioned adjustably and have specific geometry features like grooves or fins (7 in Figure 1) that allow easy movement and prevent incorrect installation. One or more movable pieces are inserted and positioned in the cover according to the preferred apertures in the cover.
Yet another example is a cover from magnetically lossy composite material, made from single piece, with similar properties as in the first example. The cover has one or more secondary apertures, as shown in the Figure 2, which are smaller than the original aperture in the enclosure.
The secondary apertures can be made also after temporary or permanent installation of the cover on the shielding enclosure. Secondary apertures can be free, can be plugged with magnetically lossless material, or can be plugged with a specific plug made from the cover material or different composite material with significant magnetic losses.
Claims (6)
- Claims 1. An apparatus for reducing a transmission of an electromagnetic field through an aperture in a electromagnetic shielding wall, comprising an aperture across the wall and a cover, characterized in that a cover is made of at least one piece, forming at least one layer of magnetically lossy material over part or whole aperture in the shielding wall.
- 2. Apparatus according to claim 1, characterized in that material with magnetic losses can be homogeneous or a composite mixture of magnetically lossy material with other materials.
- 3. Apparatus according to claim 1, characterized in that one or more parts of cover are made of conductive material.
- 4. Apparatus according to claim 1, characterized in that a cover has one or more fixed apertures into the shielded area from top or side of the cover, with these apertures having smaller or equal in cross section area compared to the aperture in a shielding wall.
- 5. Apparatus according to claim 1, characterized in that parts of a cover can be positioned in the manner to form one or more apertures into the shielded area from top or side of the cover, with the size of the apertures depending on the position of parts and these apertures having smaller or equal in cross section area compared to the aperture in a shielding wall.
- 6. Apparatus according to claim 1, characterized in that parts of cover have guiding structures for pairing.Amendment to the claims have been filed as follows Claims 1. A cover for reducing a transmission of an electromagnetic field through one or more apertures in a electromagnetic shielding wall, with the operating frequency range of the cover above 300 MHz and below 50 GHz, characterized in that said cover is made of at least one layer of nonconductive material that exhibits magnetic losses with magnetic loss tangent over 0.1 in the operating frequency range, with said cover having shortest free path of propagation of electromagnetic wave through the cover at least 1110th of wavelength in the material of the said cover, with nonconductive and lossless layer between said cover and shielding wall being below 1150th of wavelength in the said lossless layer material, and with no part of said cover having electrical contact to said shielding wall. Co (\J
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1005673.7A GB2479351B (en) | 2010-04-06 | 2010-04-06 | Lossy cover for apertures through a shielding wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1005673.7A GB2479351B (en) | 2010-04-06 | 2010-04-06 | Lossy cover for apertures through a shielding wall |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201005673D0 GB201005673D0 (en) | 2010-05-19 |
| GB2479351A true GB2479351A (en) | 2011-10-12 |
| GB2479351B GB2479351B (en) | 2012-07-18 |
Family
ID=42228877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1005673.7A Expired - Fee Related GB2479351B (en) | 2010-04-06 | 2010-04-06 | Lossy cover for apertures through a shielding wall |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2479351B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3031000A1 (en) * | 2014-12-19 | 2016-06-24 | Commissariat Energie Atomique | MAGNETIC SHIELDING OUT OF MAGNETICALLY SHIELDED ENCLOSURE |
| WO2017182936A1 (en) * | 2016-04-20 | 2017-10-26 | Gorenje Gospodinjski Aparati, D.D. | Household appliance with an electric component of electromagnetic radiation |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230189953A1 (en) * | 2021-12-22 | 2023-06-22 | Yondr, Inc. | Electronics Storage System |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3711937C1 (en) * | 1987-04-09 | 1988-07-28 | Svt Brandschutz Vertriebsgmbh | Device for electrical and/or electromagnetic screening in the case of bushings of cables, pipes and other supply lines for screened rooms and/or building parts |
| EP0780924A2 (en) * | 1995-12-22 | 1997-06-25 | Italtel s.p.a. | Device for electromagnetic disturbances shielding of a single cable |
| WO1997026783A1 (en) * | 1996-01-18 | 1997-07-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Protection for electromagnetic connection and electrostatical discharge |
| EP0991309A1 (en) * | 1996-06-11 | 2000-04-05 | Advantest Corporation | Method for reducing electromagnetic waves radiated from electronic device |
| US20010006363A1 (en) * | 1999-12-24 | 2001-07-05 | Kunio Kawato | Noise removing filter for electronic equipment |
| EP1143780A1 (en) * | 2000-04-04 | 2001-10-10 | Tokin Corporation | Electronic component comprising a metallic case provided with a magnetic loss material |
| US20030042032A1 (en) * | 2001-08-31 | 2003-03-06 | Syed Farrukh S. | Shielded cable system for high speed cable termination |
| US20030062181A1 (en) * | 2001-10-01 | 2003-04-03 | Mario Festag | Shielding element for electromagnetic shielding of an aperture opening |
| US20060083948A1 (en) * | 2003-03-25 | 2006-04-20 | Toshiyuki Kawaguchi | Electromagnetic noise suppressor, article with electromagnetic noise suppressing function, and their manufacturing methods |
| CN2777919Y (en) * | 2004-09-16 | 2006-05-03 | 上海环达计算机科技有限公司 | Metal screen case |
-
2010
- 2010-04-06 GB GB1005673.7A patent/GB2479351B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3711937C1 (en) * | 1987-04-09 | 1988-07-28 | Svt Brandschutz Vertriebsgmbh | Device for electrical and/or electromagnetic screening in the case of bushings of cables, pipes and other supply lines for screened rooms and/or building parts |
| EP0780924A2 (en) * | 1995-12-22 | 1997-06-25 | Italtel s.p.a. | Device for electromagnetic disturbances shielding of a single cable |
| WO1997026783A1 (en) * | 1996-01-18 | 1997-07-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Protection for electromagnetic connection and electrostatical discharge |
| EP0991309A1 (en) * | 1996-06-11 | 2000-04-05 | Advantest Corporation | Method for reducing electromagnetic waves radiated from electronic device |
| US20010006363A1 (en) * | 1999-12-24 | 2001-07-05 | Kunio Kawato | Noise removing filter for electronic equipment |
| EP1143780A1 (en) * | 2000-04-04 | 2001-10-10 | Tokin Corporation | Electronic component comprising a metallic case provided with a magnetic loss material |
| US20030042032A1 (en) * | 2001-08-31 | 2003-03-06 | Syed Farrukh S. | Shielded cable system for high speed cable termination |
| US20030062181A1 (en) * | 2001-10-01 | 2003-04-03 | Mario Festag | Shielding element for electromagnetic shielding of an aperture opening |
| US20060083948A1 (en) * | 2003-03-25 | 2006-04-20 | Toshiyuki Kawaguchi | Electromagnetic noise suppressor, article with electromagnetic noise suppressing function, and their manufacturing methods |
| CN2777919Y (en) * | 2004-09-16 | 2006-05-03 | 上海环达计算机科技有限公司 | Metal screen case |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3031000A1 (en) * | 2014-12-19 | 2016-06-24 | Commissariat Energie Atomique | MAGNETIC SHIELDING OUT OF MAGNETICALLY SHIELDED ENCLOSURE |
| WO2017182936A1 (en) * | 2016-04-20 | 2017-10-26 | Gorenje Gospodinjski Aparati, D.D. | Household appliance with an electric component of electromagnetic radiation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2479351B (en) | 2012-07-18 |
| GB201005673D0 (en) | 2010-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2994885C (en) | Smart emi vent | |
| US8987610B2 (en) | Vent structure for electromagnetic shielding | |
| US9622338B2 (en) | Frequency selective structures for EMI mitigation | |
| US7075798B2 (en) | Flexible isolation device that shields EMI sensitive devices from outside interference | |
| US9307631B2 (en) | Cavity resonance reduction and/or shielding structures including frequency selective surfaces | |
| KR20180098368A (en) | ELECTRONIC APPARATUS AND ELECTRON INTERFERENCE INHIBITOR SEARCH | |
| US9173333B2 (en) | Shielding structures including frequency selective surfaces | |
| US20030042990A1 (en) | EMI enclosure having a waveguide for cables | |
| GB2479351A (en) | Magnetically lossy cover for apertures through an electromagnetic shielding wall | |
| WO2017019948A1 (en) | Frequency selective structures for emi mitigation | |
| US9496656B2 (en) | Conductive attachment for shielding radiation | |
| EP1690440B1 (en) | Electronic apparatus and enclosure employing substantially co-planar portions with mating crenellations | |
| WO2010102280A2 (en) | Overlap helical conductive spring | |
| JPH0410499A (en) | Electromagnetic shield and case for electromagnetic shielding | |
| US10537048B2 (en) | Systems and methods for preventing leakage of electromagnetic waves from electronic devices | |
| US7147491B1 (en) | Non-continuous counterpoise shield | |
| JPS6225920Y2 (en) | ||
| JPH08316679A (en) | Electromagnetic shielding box and electric equipment having this case | |
| WO2014145594A1 (en) | Formed channels providing electromagnetic shielding in electronics enclosures | |
| Keshtkar et al. | Design considerations to affect on shielding effectiveness for conductive enclosure | |
| US8376780B2 (en) | Industrial plug connector | |
| JP2006303260A (en) | Cable bayonet apparatus in electromagnetic shield chamber | |
| JP2001345569A (en) | Storage structure of control equipment for high- pressure switch | |
| KR101378741B1 (en) | Non-reciprocal circuit element capable of magnetostatic field | |
| TR2021015790Y (en) | ADJUSTABLE EMI/EMC PANEL |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20140406 |