WO1995000983A1 - Anordnung zur absorption von elektromagnetischen wellen und verfahren zur herstellung dieser anordnung - Google Patents
Anordnung zur absorption von elektromagnetischen wellen und verfahren zur herstellung dieser anordnung Download PDFInfo
- Publication number
- WO1995000983A1 WO1995000983A1 PCT/EP1994/002073 EP9402073W WO9500983A1 WO 1995000983 A1 WO1995000983 A1 WO 1995000983A1 EP 9402073 W EP9402073 W EP 9402073W WO 9500983 A1 WO9500983 A1 WO 9500983A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- surface resistance
- arrangement according
- layer
- arrangement
- electromagnetic waves
- Prior art date
Links
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
-
- 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
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
-
- 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
Definitions
- the invention relates to an arrangement for broadband absorption of electromagnetic waves, a plurality of thin sheet resistance layers being arranged three-dimensionally in a space exposed to the electromagnetic waves, and to methods for producing an arrangement for the broadband absorption of electromagnetic waves.
- Absorption arrangements of this type are mainly used as reflection-free cladding of rooms for testing the electromagnetic compatibility (EMC).
- an absorption element for electromagnetic waves which consists of a three-dimensional hollow body with a rectangular cross-section.
- the four side walls each have a dielectric substrate and an outer surface coating, the specific resistance of which varies from one end to the other of the side wall in order to be able to absorb electromagnetic waves with a certain bandwidth.
- DE-AS 1 254 720 describes an arrangement in which a number of hollow pyramids are arranged abutting one another on a wall.
- the hollow pyramids are coated on their outer and inner surfaces with a conductive lacquer.
- the conductive lacquer layer is either sprayed directly onto the three-dimensional body or produced by dipping the three-dimensional body.
- the invention is therefore based on the object of combining high absorption efficiency with a wide bandwidth with the advantages of simple and automatable manufacture.
- the invention succeeds for the first time in absorbing a broadband spectrum of electromagnetic radiation with the aid of inexpensive, light-weight and thin surface resistance layer components.
- the invention is based on the knowledge that thin surface resistance tracks have an absorbing effect on electromagnetic radiation with different wavelengths even with a uniform surface resistance distribution if they are arranged in a certain and / or statistical three-dimensional geometry in a space exposed to electromagnetic radiation are.
- the broadness is therefore achieved through the special geometric arrangement of the thin surface resistance layers in space.
- Both the sputtered or deposited layer of electrically conductive or semiconductive material and the electrically conductive organic layer enable a uniform and uniform specific surface resistance distribution.
- the absorption properties can be set reproducibly. Since the surface resistance layers are very thin, they advantageously have a low weight and are accordingly inexpensive to produce.
- the ratio of absorber power / weight unit of the arrangement is particularly high, so that the arrangement according to the invention has an unprecedented ecological compatibility.
- An essential aspect in the production of the absorber arrangement according to the invention is that any number of absorption elements can be produced from a surface resistance track.
- the carrier web or the surface resistance web which arises after the coating can have a width of 0.8 m and a length of 10000 m, for example.
- the finished surface resistance track can be found at the end of the track product. roll up the process to a compact web supply.
- the surface resistance sections required for the geometric support structures are then cut from the roll of material, punched out or shaped in another suitable manner, positioned and fixed on the support structure. This creates the desired spatial, for example pyramid-shaped absorber structure.
- the absorber pyramids of this type are used to line the space exposed to the electromagnetic waves (in wall and ceiling areas).
- the carrier layer and / or the surface resistance layer is provided with a fire protection layer made of electromagnetically inert material, for example made of ceramic, mineral and / or glass-like material.
- the surface resistance layer can be a sputtered or deposited metal or semiconductor layer.
- the metal or semiconductor materials are preferably selected from the following group of elements: aluminum, chromium, iron, indium, nickel, antimony, tin, tantalum, titanium and zinc.
- One or more of these elements are preferably in a vacuum, optionally with the addition of reactive gases, such as Oxygen, vapor-deposited or sputtered onto the carrier web.
- reactive gases such as Oxygen
- the thickness of the conductive or semiconducting layer is 5 nm to 1000 nm, preferably 10 nm-200 nm.
- the surface resistance layers run in sections at different angles of attack. This is the case, for example, with the wedge, cone or pyramid arrangements mentioned above.
- the surface resistance layers can also be arranged in several different planes, for example spanned.
- the absorption spectrum is in the latter arrangement achieved by the different and preferably parallel absorption levels.
- a three-dimensional absorber structure consists of a receptacle with a filler, which is preferably formed by sheet-like multiply kinked or crumpled surface resistance layers is formed. Strongly profiled wall areas can form at least one side wall of the receptacle. Another side wall of the receptacle can be formed by a simple covering which is hardly mechanically stressed by the crumpled surface resistance tracks.
- the surface resistance layer can also be further processed into volume absorber material. If you cut the surface resistance layer e.g. into long, narrow strips, a volume filling material for absorber applications is obtained which, with much less material required, can have the same absorption capacities as conventional absorber materials which are doped with conductive particles instead of the strips.
- the arrangement of the narrow strips in the volume of space can be arranged both in ordered structures, e.g. lattice-like, as well as statistically distributed, e.g. be realized with a bulk.
- the surface resistance layer e.g. a coated polyethylene film
- a thicker, absorbent structure with chambers and cavities can be realized in this way, which can be structured similarly to the packaging materials containing air chambers made of polymer films, which have been developed for shock-absorbing transport of sensitive goods and are known under the name of air-cushion films.
- a particularly simple positioning and fixing can take place by means of pressure differences as in an air-filled hall, so to speak, an "inflation" of the absorbers, or by means of a rod, similar to tent structures.
- Another embodiment of the invention is characterized in that several air or gas-filled hollow body structures with an outer skin designed as a surface resistance layer are closely joined together and / or connected to one another and arranged on at least one wall of the room.
- the closed hollow body structures serving as absorption elements can have different, preferably statistical, surface configurations.
- Fig. 1 shows schematically a station for the production of a
- FIG. 1 shows, on a greatly enlarged scale, a section of a surface resistance layer produced according to FIG. 1; 2B shows a section of a surface resistance layer made of an organic conductor, also on an enlarged scale; 3A shows a partial view of an exemplary embodiment of an absorber structure with a pyramid-shaped geometry; 3B shows an absorber structure similar to that according to FIG. 3A with a differently designed support structure; and FIG. 4 shows a schematic side view of the interior of a room exposed to electromagnetic waves, the side and top walls of which are practically completely set with pyramid-shaped absorber structures.
- a particularly economical production of the active component of the absorption arrangement according to the invention namely a surface resistance layer 1 is first described.
- a thin carrier web 11 made of poly Mer film or paper with a thickness of 5-500 ⁇ m is drawn off from a supply roll 2, deflected and moved in the direction of arrow A into a vapor deposition zone under a vapor deposition arrangement 3.
- aluminum with oxidative components is applied in a reactive oxygen atmosphere.
- An aluminum layer can either be deposited on one side in the manner shown or on both sides of the carrier web 11.
- the Al layer 12 has a thickness of only approximately 20-40 nm.
- a lacquer seal on the resistance layer 12 can be dried in a heating chamber 4.
- the web 1 is then wound on a take-up roll 5.
- the value of the surface resistance can be set to a desired value by varying the process parameters, for example to 150 ohms.
- FIG. 2A An enlarged representation of a section of the surface resistance layer 1 is shown in FIG. 2A.
- the carrier layer 11 can also be coated on both sides with thin, conductive or semiconducting layers 12, 13 forming surface resistances.
- a double-sided coating increases the efficiency of the absorption structure produced from the surface resistance layer 1, since the absorption capacity of the structure on both sides of the layer can be adapted to the electromagnetic radiation effective there.
- a fire protection layer made of a non-inflammable or flame-retardant, preferably electrically and electromagnetic largely inert material, e.g. made of mineral wool, ceramic and / or glass.
- the surface resistance layer 1A consists of a sheet, preferably made of plastic, into the conductive or semi-conductive one fine particles 14 are embedded in a distribution suitable for absorption purposes.
- the conductive or semiconducting particles can also consist of plastic.
- intrinsically conductive polymers can be used.
- FIG. 3A shows a schematic sectional view through a pyramid-shaped element 20 of the absorption arrangement according to the invention.
- the structural element 20 consists of a rod frame 22 with a base square and four rods which form the pyramid edges and are made of electrically insulating glass fiber material and an outer skin 24. The latter is made from a cut from the web material 1 or 1A.
- a surface resistance layer 1 was fitted and fixed onto the rod frame 22 after suitable cutting and thermal welding of the film forming the carrier web 11.
- the pyramid forming the absorption element 20 had a height of 1.50 mm and an open base area of 0.35 x 0.35 m 2 .
- numerous geometric structures can be constructed in a very simple manner from a suitable carrier frame and surface resistance blanks.
- the apices should be relatively acute-angled and should have apex angles 26 in the range between 5 and 50 °, preferably between 8 and 25 °.
- FIG. 3B shows an absorption element 21 similar to that (20) according to FIG. 3A.
- the only difference is that the outer skin 24 of the pyramid is not supported by a support frame 22, but is laminated onto a pyramid-shaped, self-supporting hollow body 23 made of a suitable plastic or cardboard.
- the outer skin 24 can, however, in the case of another structural alternative not shown in the drawing, also be designed as an inflatable component in the manner of an air-inflated hall.
- the skin 24 forming the absorption structure is exposed to a slight differential pressure which keeps the outer skin 24 in its pyramid-shaped geometry.
- a combined truncated pyramid shape can also be provided.
- FIG. 4 schematically shows a vertical section through an EMC test room 30, the side walls and ceiling of which are lined with pyramid-shaped, practically seamless abutting absorber structures 20.
- An antenna arrangement 31 and the device 32 to be tested are shown in the test room 30.
- the lining of the test space 30 with geometrically distributed surface resistances ensures a practically total, reflection-free absorption of the field energy, so that optimal test results are guaranteed.
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94920464A EP0705487B1 (de) | 1993-06-25 | 1994-06-27 | Anordnung zur absorption von elektromagnetischen wellen und verfahren zur herstellung dieser anordnung |
KR1019950705592A KR100334946B1 (ko) | 1993-06-25 | 1994-06-27 | 전자기파흡수용시스템과이시스템의제조방법 |
US08/569,215 US5710564A (en) | 1993-06-25 | 1994-06-27 | System for absorbing electromagnetic waves and method of manufacturing this system |
CA002163516A CA2163516C (en) | 1993-06-25 | 1994-06-27 | System for absorbing electromagnetic waves and method of manufacturing this system |
DE59407350T DE59407350D1 (de) | 1993-06-25 | 1994-06-27 | Anordnung zur absorption von elektromagnetischen wellen und verfahren zur herstellung dieser anordnung |
AU71246/94A AU7124694A (en) | 1993-06-25 | 1994-06-27 | Arrangement for absorbing electromagnetic waves and process for producing the same |
JP7502452A JPH08512178A (ja) | 1993-06-25 | 1994-06-27 | 電磁波を吸収するシステムおよびこのシステムを製造する方法 |
DK94920464T DK0705487T3 (da) | 1993-06-25 | 1994-06-27 | Anordning til bredbåndet absorption af elektromagnetiske bølger og fremgangsmåde til fremstilling af denne anordning |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4321165 | 1993-06-25 | ||
DEP4321165.8 | 1993-06-25 | ||
DEP4404071.7 | 1994-02-09 | ||
DE4404071A DE4404071C2 (de) | 1993-06-25 | 1994-02-09 | Anordnung zur Absorption von elektromagnetischen Wellen und Verfahren zur Herstellung dieser Anordnung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995000983A1 true WO1995000983A1 (de) | 1995-01-05 |
Family
ID=25927110
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/002073 WO1995000983A1 (de) | 1993-06-25 | 1994-06-27 | Anordnung zur absorption von elektromagnetischen wellen und verfahren zur herstellung dieser anordnung |
Country Status (10)
Country | Link |
---|---|
US (1) | US5710564A (de) |
EP (1) | EP0705487B1 (de) |
JP (1) | JPH08512178A (de) |
CN (1) | CN1054473C (de) |
AT (1) | ATE173861T1 (de) |
AU (1) | AU7124694A (de) |
CA (1) | CA2163516C (de) |
DK (1) | DK0705487T3 (de) |
ES (1) | ES2124894T3 (de) |
WO (1) | WO1995000983A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0938254A1 (de) * | 1997-09-09 | 1999-08-25 | Nisshinbo Industries, Inc. | Nicht entflammbarer absorber für funkwellen |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1010745C2 (nl) * | 1998-12-07 | 2000-06-08 | Hollandse Signaalapparaten Bv | Testruimte. |
JP4377467B2 (ja) | 1999-01-21 | 2009-12-02 | Tdk株式会社 | 電波吸収体組立用部材およびそれを用いた電波吸収体 |
US6469667B2 (en) | 2000-02-01 | 2002-10-22 | Science Applications International Corporation | Passive anti-jamming antenna system |
JP2003229691A (ja) * | 2002-01-31 | 2003-08-15 | Riken Corp | 電波吸収体 |
JP4346360B2 (ja) * | 2002-12-25 | 2009-10-21 | 東レ株式会社 | 電波吸収体用シート材および電波吸収体 |
US7250920B1 (en) | 2004-09-29 | 2007-07-31 | The United States Of America As Represented By The Secrtary Of The Navy | Multi-purpose electromagnetic radiation interface system and method |
US7688246B2 (en) * | 2005-05-10 | 2010-03-30 | Fuji Xerox Co., Ltd. | Radio wave absorber, electromagnetic field measurement system and radiated immunity system |
JP2007096269A (ja) * | 2005-08-30 | 2007-04-12 | Nisca Corp | 近傍界電磁波吸収体 |
CA2637339C (en) * | 2005-12-12 | 2015-02-17 | Irina Puscasu | Selective reflective and absorptive surfaces and method for resonantly coupling incident radiation |
WO2012094498A2 (en) * | 2011-01-07 | 2012-07-12 | The Regents Of The University Of Michigan | Electromagnetic radiation absorbing surfaces for cloaking three-dimensional objects |
FR3118563B3 (fr) * | 2020-12-28 | 2022-12-30 | Emitech | Panneaux anéchoïques gonflables |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB776158A (en) * | 1953-03-28 | 1957-06-05 | Werner Genest Ges Fur Isolieru | Improvements in or relating to absorbers for radio waves |
BE684834A (de) * | 1965-07-29 | 1967-01-30 | ||
EP0369174A1 (de) * | 1988-11-15 | 1990-05-23 | G + H Montage Gmbh | Breitbandabsorber für elektromagnetische Wellen |
EP0370421A1 (de) * | 1988-11-22 | 1990-05-30 | Akzo Kashima Limited | Absorber für elektromagnetische Wellen |
WO1991005376A1 (en) * | 1989-10-02 | 1991-04-18 | General Atomics | Bulk rf absorber apparatus and method |
EP0425262A2 (de) * | 1989-10-26 | 1991-05-02 | Colebrand Limited | Absorber |
EP0473515A1 (de) * | 1990-08-30 | 1992-03-04 | Commissariat A L'energie Atomique | Herstellungsverfahren einer elektronisches leitfähiges Polymer enthaltenden Abschirmung |
WO1993015530A1 (de) * | 1992-02-04 | 1993-08-05 | Illbruck Gmbh | Absorber für elektromagnetische wellen |
-
1994
- 1994-06-27 US US08/569,215 patent/US5710564A/en not_active Expired - Fee Related
- 1994-06-27 AU AU71246/94A patent/AU7124694A/en not_active Abandoned
- 1994-06-27 CN CN94192565A patent/CN1054473C/zh not_active Expired - Lifetime
- 1994-06-27 WO PCT/EP1994/002073 patent/WO1995000983A1/de active IP Right Grant
- 1994-06-27 CA CA002163516A patent/CA2163516C/en not_active Expired - Fee Related
- 1994-06-27 EP EP94920464A patent/EP0705487B1/de not_active Expired - Lifetime
- 1994-06-27 DK DK94920464T patent/DK0705487T3/da active
- 1994-06-27 AT AT94920464T patent/ATE173861T1/de not_active IP Right Cessation
- 1994-06-27 ES ES94920464T patent/ES2124894T3/es not_active Expired - Lifetime
- 1994-06-27 JP JP7502452A patent/JPH08512178A/ja active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB776158A (en) * | 1953-03-28 | 1957-06-05 | Werner Genest Ges Fur Isolieru | Improvements in or relating to absorbers for radio waves |
BE684834A (de) * | 1965-07-29 | 1967-01-30 | ||
EP0369174A1 (de) * | 1988-11-15 | 1990-05-23 | G + H Montage Gmbh | Breitbandabsorber für elektromagnetische Wellen |
EP0370421A1 (de) * | 1988-11-22 | 1990-05-30 | Akzo Kashima Limited | Absorber für elektromagnetische Wellen |
WO1991005376A1 (en) * | 1989-10-02 | 1991-04-18 | General Atomics | Bulk rf absorber apparatus and method |
EP0425262A2 (de) * | 1989-10-26 | 1991-05-02 | Colebrand Limited | Absorber |
EP0473515A1 (de) * | 1990-08-30 | 1992-03-04 | Commissariat A L'energie Atomique | Herstellungsverfahren einer elektronisches leitfähiges Polymer enthaltenden Abschirmung |
WO1993015530A1 (de) * | 1992-02-04 | 1993-08-05 | Illbruck Gmbh | Absorber für elektromagnetische wellen |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0938254A1 (de) * | 1997-09-09 | 1999-08-25 | Nisshinbo Industries, Inc. | Nicht entflammbarer absorber für funkwellen |
EP0938254A4 (de) * | 1997-09-09 | 2001-01-17 | Nisshin Spinning | Nicht entflammbarer absorber für funkwellen |
Also Published As
Publication number | Publication date |
---|---|
CA2163516A1 (en) | 1995-01-05 |
CA2163516C (en) | 1999-07-13 |
EP0705487B1 (de) | 1998-11-25 |
DK0705487T3 (da) | 1999-08-09 |
ATE173861T1 (de) | 1998-12-15 |
ES2124894T3 (es) | 1999-02-16 |
CN1126000A (zh) | 1996-07-03 |
US5710564A (en) | 1998-01-20 |
CN1054473C (zh) | 2000-07-12 |
JPH08512178A (ja) | 1996-12-17 |
EP0705487A1 (de) | 1996-04-10 |
AU7124694A (en) | 1995-01-17 |
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