AU728113B2 - Plastic body, in particular flat element, for limiting HF reflection - Google Patents
Plastic body, in particular flat element, for limiting HF reflection Download PDFInfo
- Publication number
- AU728113B2 AU728113B2 AU67234/98A AU6723498A AU728113B2 AU 728113 B2 AU728113 B2 AU 728113B2 AU 67234/98 A AU67234/98 A AU 67234/98A AU 6723498 A AU6723498 A AU 6723498A AU 728113 B2 AU728113 B2 AU 728113B2
- Authority
- AU
- Australia
- Prior art keywords
- plastic
- particles
- frequency radiation
- plastic element
- element according
- 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.)
- Ceased
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 45
- 229920003023 plastic Polymers 0.000 title claims abstract description 45
- 239000002245 particle Substances 0.000 claims abstract description 25
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- 230000005670 electromagnetic radiation Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000011701 zinc Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 239000012948 isocyanate Substances 0.000 claims description 3
- 150000002513 isocyanates Chemical class 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 235000011837 pasties Nutrition 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000003643 water by type Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 10
- 238000013016 damping Methods 0.000 abstract description 3
- 230000005611 electricity Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002984 plastic foam Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/16—Screening or neutralising undesirable influences from or using, atmospheric or terrestrial radiation or fields
-
- 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
- H05K9/0001—Rooms or chambers
- H05K9/0003—Shielded walls, floors, ceilings, e.g. wallpaper, wall panel, electro-conductive plaster, concrete, cement, mortar
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0821—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning rooms and test sites therefor, e.g. anechoic chambers, open field sites or TEM cells
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
- Led Device Packages (AREA)
- Burglar Alarm Systems (AREA)
- Surgical Instruments (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Materials For Medical Uses (AREA)
- Laminated Bodies (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
A plastic body, in particular flat element, limits the reflection of high-frequency radiation in HF-shielded areas, such as computer installation sites, HF-shielded rooms or the like, especially for carrying out measurement on high-frequency-radiating objects. Electroconducting or high-frequency radiation-scattering particles are provided in the plastic material. The object of the invention is to provide a lighter and in particular cheaper room lining without reducing its damping and shielding properties. This is achieved in that the electroconducting particles (3) are enclosed in the plastic material (4) such that electricity is not conducted through the plastic material in the transverse or longitudinal directions.
Description
-1- PLASTIC BODY, IN PARTICULAR FLAT ELEMENT, FOR LIMITING HF
REFLECTION
The invention is directed at a plastic element, in particular a sheetlike element, for the confinement of reflections of high-frequency radiation in HF-shielded areas, such as places where computers are installed, HF-shielded chambers or the like, in particular during measuring operations on objects emitting high-frequency radiation, with electrically conducting or high-frequency radiation-scattering particles being provided in the plastic. A sheet or a correspondingly coated fabric is known from WO 93/09944-A.
To obtain comparatively accurate measuring results in connection with the examination of objects emitting high-frequency radiation,-they areexamined-inmeasuring chambers in which the walls are provided with a covering which-does not reflect the high-frequency radiation or only to an extremely small extent. Such a covering generally comprises ferrite tiles, which are capable of absorbing incident highfrequency (from now on HF) radiation. The ferrite tiles are adhesively attached, or ***fastened in some other way, onto the metal walls of the test chamber, forming a Faraday 00: cage and consequently the HF shielding. Such a covering is not only relatively heavy, i" which influences the statics of such chambers, it is also comparatively expensive.
A shielding means for shielding against static electric fields in the form of a multilayered sheet is known from DE-37 07 238-A1, where a powder of conductive material is incorporated in plastic foam. The specific avoidance of transverse and longitudinal electrical conduction achieved by the plastic is not disclosed by this literature reference. Shielding panels or sheets are described in other prior literature references, special means for shielding also being known from the prior art, for instance 26 890, DE-Al publications 34 17 895, 39 00 856, 40 03 908, 40 26 403, 41 01 869, 42 43 368, 43 24 916, 43 35 626 or 195 18 541-C2. The prior art also includes an absorber for electromagnetic radiation according to DE-37 03 755-A and a material I absorbing electromagnetic waves according to FR-2 675 654-A1 or EP-0 437 979-A.
22679-00.DOC -2- The literature references cited above generally have in common that they attempt to provide electrically conductive plastics to achieve the advantages respectively described. It is an object of the present invention to overcome or ameliorate at least one of the disadvantages of the prior art, or to provide a useful alternative.
According to a first aspect of the invention there is provided a plastic element, in particular a sheetlike element, for the confinement of reflections of high-frequency radiation in HF-shielded areas, such as places where computers are installed, -Fshielded chambers or the like, in particular during measuring operations on objects emitting high-frequency radiation, with electrically conducting or high-frequency radiation-scattering particles being provided in the plastic, wherein the particles embedded in the plastic have a crystalline structure for the diffuse scattering of the S•electromagnetic radiation and wherein these particles are enclosed in the plastic in such a go way that there is neither transverse nor longitudinal electrical conduction through the V plastic.
According to another aspect of the invention there is provided a process for producing a plastic element for the confinement of reflections of high high-frequency S. radiation according to any one of the preceding claims, with the use of polyurethane as 20 the backing plastic, wherein a pasty substrate of metal powder, graphite powder and the polymer component is produced, the isocyanate component is subsequently fed in and •the mixture is made to expand.
Preferred embodiments of the invention advantageously provide particles embedded in the plastic having a crystalline structure for the scattering of the electromagnetic radiation and by these particles being enclosed in the plastic in such a way that there is neither transverse nor longitudinal electrical conduction through the plastic.
Preferred embodiments of the invention advantageously provides a production process with the use of the polyurethane as a backing plastic, which is distinguished in 22679-00.DOC that a pasty substrate of metal powder, graphite powder and the polyol component is produced, the isocyanate component is subsequently fed in and the mixture is made to expand.
Preferably, it is advantageous if some of the electrical particles comprise essentially metal powder, in particular iron powder, while others may comprise graphite powder.
In addition to these particles, it is also possible according to preferred embodiments of the invention to form the particles from manganese, zinc and/or nickel, a particularly advantageous development of these embodiments being that the embedded electrical particles have a crystalline structure for diffuse scattering-within the material •o Preferred embodiments of the invention advantageously provide the metal powder S 15 being sprayed with water and not discharged in an inert gas atmosphere during its production, so that the water-sprayed particles have crystalline surfaces as compared with the inert-gas-sprayed particles, which generally have a shape closely resembling a spherical shape and no longer allow diffuse reflections, as desired.
*.o 20 Preferably, the iron powder may amount to up to 90% of the total amount of *embedded particles present as additives in the plastic. Preferably also, the remainder S"may comprise, for example, manganese, zinc and/or nickel powders, however, preferred embodiments of the invention are not restricted to these specified amounts, it also being possible for the amounts to be distributed in some other way within the plastic.
A corresponding sheetlike element is particularly inexpensive if polyurethane is provided for example as the backing plastic. Synthetic resins or the like may of course also be used if so desired for certain reasons. Polyurethane has the special advantages associated with this plastic, it is lightweight, easy to process and, in particular, easy to mold.
22679-00.DOC According to preferred embodiments of the invention, the sheetlike elements may be designed in the form of panels, but also as strips or roll material or as geometrically comparatively small plates, i.e. of the size of tiles.
Preferred embodiments of the invention advantageously provide a corresponding plastic element having a high dielectric strength 10 kV/mm), the electrically conducting particles being completely enclosed, so that they can fully bring to bear their three-dimensional properties. High-purity carbon used absorbs deeply penetrating high frequency radiation, in this case by conversion into heat. The abstraction capability is around 20 dBTL on average and an effectiveness of 15 Mhz into the high Ghz range.
••"Preferably, the use of rigid polyurethane foam, which usually forms a defined bubble size, produces a high effectiveness at frequenciesabove 600 Mhz;-for this operation to be influenced and controlled in high-pressure molds of different sizes during the production process.
In comparison with known ferrite materials, a sheetlike element according to preferred embodiments of the present invention has a number of advantages:.
S 20 1 cm3 weighs less than 0.2 g (ferrite 5.0 g/cm3). The low weight means that no equipment is damaged during transit; it is not conductive and can consequently be used on live elements as a damping material without insulation; it is easy to install and has no environmental impact; producing can be carried out with the simplest means; it can be used in anechoic chambers for reflection damping and in electrical and RA41electronic equipment for interference suppression; and 22679-00.DOC the low weight has the effect of reducing transport costs.
Unless the context clearly requires otherwise, throughout the description and the claims, the words 'comprise', 'comprising', and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".
A preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawing in which Figure 1 illustrates the corner of a shielding chamber according to the invention.
In the example represented,-the coner of a-metal-shielding generally denoted"by- 1 is lined toward the interior of the chamber with sheetlike elements according to the invention, three variants being shown here, namely a comparatively large-area bottom panel 2a, strip or roll sheetlike elements 2b on one wall side and sheetlike elements 2c in tile form on the other wall side, which serve here merely as examples and are not o intended to restrict the invention.
The electrically conducting particles 3 are intended to be represented in the panels dots, shading 4 being intended to illustrate that these are particles 3 embedded in the plastic.
Indicated on the bottom panel 2a is a tripod 5 with a test piece 6 emitting HF radiation, the emanating HF radiation being indicated by wavy arrows 7. In the upper region of the figure, the incidence of such HF radiation on particles is indicated, small arrows in the interior of the panels being intended to indicate a diffuse reflected radiation.
Finally, on one tile 2c there is also indicated the possibility of providing reflection pyramids 9, which are known however and do not represent a special feature of the invention.
22679-00O.DOC An example of production is specified as follows: Admixtures (20 kg of carbon, 20 kg of iron-manganese/m 3 iron, nickel or zinc are also used depending on the frequency response) are stirred into the nonactive component of the polyurethane to form the homogeneous composition and then brought into a pressure-sealed stable mold, in which the material can expand.
The finished material can be cut with a saw to any desired size and shape.
The described exemplary embodiments of the invention can of course be modified in many respects without departing from the basic idea. The invention is therefore not restricted either to the particular three-dimensional shaping-of the individual-sheetlikeelements, or to the way in which they are joined together by tongue and groove joints or the like or to specific metallic powders embedded in plastic, or indeed to particular *s 15 plastics.
a 22679-00.DOC
Claims (8)
1. A plastic element, in particularia sheetlike element, for the confinement of reflections of high-frequency radiation in HF-shielded areas, such as places where computers are installed, HF-shielded chambers or the like, in particular during measuring operations on objects emitting high-frequency radiation, with electrically conducting or high-frequency radiation-scattering particles being provided in the plastic, wherein the particles embedded in the plastic have a crystalline structure for the diffuse scattering of the electromagnetic radiation and wherein these particles are enclosed in the plastic in such a way that there is neither transverse nor longitudinal electrical conduction through the plastic.
2. A plastic element according to claim 1, wherein some of the electrical particles comprise essentially metal powder, in particular. iron powder. 0
3. A plastic element according to claim 1 or 2, wherein some of the embedded particles comprise graphite powder.
4. A plastic element according to claim 1 or 2, wherein the embedded particles are formed from manganese, zinc and/ornickel. A plastic element according to any one of the preceding claims, wherein polyurethane or the like is provided.as the backing plastic. A plastic element according to any one of the preceding claims, wherein the plastic 20 element is designed as a sheetlike element in the form of panels, strips, rolls and/or tiles.
7. A process for producing a plastic element for the confinement of reflections of S• high high-frequency radiation according to any one of the preceding claims, with the use of polyurethane as the backing plastic, wherein a pasty substrate of metal powder, graphite powder and the polymer component is produced, the isocyanate component is subsequently fed in and the mixture is made to expand.
8. A process according to claim 7, wherein the expansion is carried out in a pressure vessel, as known per se.
9. A plastic element substantially as herein described with reference to any of the embodiments of the invention illustrated in the accompanying drawings and/or 0 examples.
22679-00O.DOC -8- A process for producing a plastic element substantially as herein described with reference to any of the embodiments of the invention illustrated in the accompanying drawings and/or examples. DATED this 15th Day of March, 2000 EMC TESTHAUS SCHWERTE GmbH Attorney: JOHN B. REDFERN Fellow Institute of Patent Attorneys of Australia of BALDWIN SHELSTON WATERS S S S 5595 S 5555 V S 555 55 S S 555. S S S. S S S S S S SSS* S
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29703725 | 1997-03-01 | ||
| DE29703725U DE29703725U1 (en) | 1997-03-01 | 1997-03-01 | Area element to limit RF reflections |
| PCT/EP1998/001013 WO1998038518A1 (en) | 1997-03-01 | 1998-02-21 | Plastic body, in particular flat element, for limiting hf reflection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6723498A AU6723498A (en) | 1998-09-18 |
| AU728113B2 true AU728113B2 (en) | 2001-01-04 |
Family
ID=8036788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU67234/98A Ceased AU728113B2 (en) | 1997-03-01 | 1998-02-21 | Plastic body, in particular flat element, for limiting HF reflection |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0963558B1 (en) |
| JP (1) | JP2001525056A (en) |
| AT (1) | ATE253228T1 (en) |
| AU (1) | AU728113B2 (en) |
| DE (2) | DE29703725U1 (en) |
| IL (1) | IL131664A0 (en) |
| NO (1) | NO994219L (en) |
| TR (1) | TR199902441T2 (en) |
| WO (1) | WO1998038518A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3703755A1 (en) * | 1987-02-07 | 1988-08-18 | Rheinhold & Mahla Gmbh | Absorber for electromagnetic rays |
| EP0437979A2 (en) * | 1989-12-28 | 1991-07-24 | Parker Hannifin Corporation | Corrosion inhibiting EMI/RFI shielding coating and method of its use |
| WO1993009944A1 (en) * | 1991-11-15 | 1993-05-27 | Dispenza Beth A | Materials for electromagnetic radiation attenuation |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2026890A1 (en) * | 1969-07-14 | 1971-12-16 | Hendrix H | Metal powder/plastic/plasticiser compsn - for prodn - of tapes or coatings for screening against electromagnetic radiation |
| DE7027288U (en) * | 1970-07-20 | 1972-11-09 | Rommenhoeller Kohlensaeure | ENERGY RESISTANT PLATE. |
| DE3417895A1 (en) * | 1984-05-14 | 1985-11-14 | Schulte-Uebbing, Ernst, Dr., 8000 München | Use of colloidal metal solutions for screening of electromagnetic waves, and a device therefor |
| DE8429855U1 (en) * | 1984-10-10 | 1986-04-10 | Raupach, Peter, Dipl.-Volksw., 8600 Bamberg | Wall for a test room to be screened |
| DE3707238A1 (en) * | 1987-03-06 | 1988-09-15 | Claus Kolckmann | Screening device |
| EP0301561B1 (en) * | 1987-07-31 | 1992-12-09 | TDK Corporation | Magnetic shield-forming magnetically soft powder, composition thereof, and process of making |
| DE3900856A1 (en) * | 1989-01-13 | 1990-07-26 | Messerschmitt Boelkow Blohm | FACADE CONSTRUCTION OF BUILDINGS |
| US5275880A (en) * | 1989-05-17 | 1994-01-04 | Minnesota Mining And Manufacturing Company | Microwave absorber for direct surface application |
| DE3918383A1 (en) * | 1989-06-06 | 1990-12-20 | Messerschmitt Boelkow Blohm | FACADE CONSTRUCTION OF BUILDINGS |
| DE4003908A1 (en) * | 1990-02-09 | 1991-08-14 | Basf Ag | Highly-filled high-temp. polymers for electromagnetic screening - contain aromatic polyether-sulphone, polyether-ketone, polyimide etc., and above 70 wt. per cent metal-ferrite, -titanate or -zirconate |
| JP2702796B2 (en) * | 1990-02-23 | 1998-01-26 | 旭化成工業株式会社 | Silver alloy conductive paste |
| DE4026403C2 (en) * | 1990-08-21 | 1995-03-30 | Blohm Voss Ag | Wall system with shielding against electromagnetic fields and rays |
| DE4101869A1 (en) * | 1991-01-23 | 1992-07-30 | Basf Ag | PLASTIC MIXTURE WITH FERROMAGNETIC OR FERROELECTRIC FILLERS |
| FR2675654B1 (en) * | 1991-04-16 | 1997-11-14 | Alsthom Cge Alcatel | ELECTROMAGNETIC WAVE ABSORBING MATERIAL FOR USE AT HIGH TEMPERATURES. |
| US5278377A (en) * | 1991-11-27 | 1994-01-11 | Minnesota Mining And Manufacturing Company | Electromagnetic radiation susceptor material employing ferromagnetic amorphous alloy particles |
| CA2080177C (en) * | 1992-01-02 | 1997-02-25 | Edward Allan Highum | Electro-magnetic shield and method for making the same |
| DE4243368A1 (en) * | 1992-12-21 | 1994-09-29 | Proc Peter | Article made from used plastics |
| DE4324916A1 (en) * | 1993-07-24 | 1995-01-26 | Hugo Wolfgang Fiessler | Moulded element for absorption of electromagnetic waves |
| DE4335696C2 (en) * | 1993-10-20 | 1998-01-29 | Lohmann Gmbh & Co Kg | Sheet-like shielding for openings in a Faraday cage shielding a device and method for the production thereof |
| JP2956875B2 (en) * | 1994-05-19 | 1999-10-04 | 矢崎総業株式会社 | Molding material for electromagnetic shielding |
-
1997
- 1997-03-01 DE DE29703725U patent/DE29703725U1/en not_active Expired - Lifetime
-
1998
- 1998-02-21 IL IL13166498A patent/IL131664A0/en unknown
- 1998-02-21 AU AU67234/98A patent/AU728113B2/en not_active Ceased
- 1998-02-21 DE DE59810025T patent/DE59810025D1/en not_active Expired - Fee Related
- 1998-02-21 WO PCT/EP1998/001013 patent/WO1998038518A1/en active IP Right Grant
- 1998-02-21 TR TR1999/02441T patent/TR199902441T2/en unknown
- 1998-02-21 JP JP53728398A patent/JP2001525056A/en active Pending
- 1998-02-21 AT AT98912365T patent/ATE253228T1/en not_active IP Right Cessation
- 1998-02-21 EP EP98912365A patent/EP0963558B1/en not_active Expired - Lifetime
-
1999
- 1999-08-31 NO NO994219A patent/NO994219L/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3703755A1 (en) * | 1987-02-07 | 1988-08-18 | Rheinhold & Mahla Gmbh | Absorber for electromagnetic rays |
| EP0437979A2 (en) * | 1989-12-28 | 1991-07-24 | Parker Hannifin Corporation | Corrosion inhibiting EMI/RFI shielding coating and method of its use |
| WO1993009944A1 (en) * | 1991-11-15 | 1993-05-27 | Dispenza Beth A | Materials for electromagnetic radiation attenuation |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001525056A (en) | 2001-12-04 |
| NO994219L (en) | 1999-10-25 |
| DE29703725U1 (en) | 1997-04-24 |
| IL131664A0 (en) | 2001-01-28 |
| EP0963558B1 (en) | 2003-10-29 |
| ATE253228T1 (en) | 2003-11-15 |
| NO994219D0 (en) | 1999-08-31 |
| WO1998038518A1 (en) | 1998-09-03 |
| AU6723498A (en) | 1998-09-18 |
| DE59810025D1 (en) | 2003-12-04 |
| TR199902441T2 (en) | 2000-01-21 |
| EP0963558A1 (en) | 1999-12-15 |
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