EP0924798B1 - Matériau composite structural absorbant les ondes radar et utilisation d'un tel matériau - Google Patents

Matériau composite structural absorbant les ondes radar et utilisation d'un tel matériau Download PDF

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Publication number
EP0924798B1
EP0924798B1 EP98402984A EP98402984A EP0924798B1 EP 0924798 B1 EP0924798 B1 EP 0924798B1 EP 98402984 A EP98402984 A EP 98402984A EP 98402984 A EP98402984 A EP 98402984A EP 0924798 B1 EP0924798 B1 EP 0924798B1
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EP
European Patent Office
Prior art keywords
around
composite material
layer
layers
thickness
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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.)
Expired - Lifetime
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EP98402984A
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German (de)
English (en)
French (fr)
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EP0924798A1 (fr
Inventor
Jean-Francois Escarmant
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Giat Industries SA
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Giat Industries SA
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    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • 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
    • H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders
    • 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

Definitions

  • the technical sector of the present invention is that of structural composite materials absorbing radar waves.
  • One of the possible solutions to reduce the opportunities to detect a battle tank consists of use overlay materials or structure chests capable of significantly reducing reflection of the incident radar wave.
  • a difficulty lies in the design of a composite material with radar absorption properties in the frequency bands currently used on the battlefield and which are located at 8-18 GHz, at 35 GHz and at 94 GHz.
  • EP 0 121 655 discloses a composite material made by stacking five layers of fabric prepreg. Each of the five layers is described as having conductive charges with a concentration increasing from one layer to another, the loads being iron powder, graphite, carbon, ferrites or ceramics.
  • the described material therefore uses a gradient impedance, by progressive increase of charges conductors, in order to obtain absorption properties radar waves.
  • the object of the present invention is to provide a structural composite material capable of absorbing the incident radar radiation.
  • the impregnated folds are fiberglass or Nylon® associated with epoxy resins.
  • the composite material can have a thickness of the order of 4 to 10 mm.
  • the outer layer has a thickness of the order of 1.5 to 4 mm, the intermediate layer a thickness of the order of 0.5 to 2.5 mm and the layer internal a thickness of the order of 1.5 to 3.5 mm.
  • the material composite has a total thickness of about 6.75 mm, the outer, intermediate and inner layers having the respective thicknesses of 2.75 mm, 1.5 mm and 2.5 mm.
  • particles electrically conductive are carbon grains having a diameter of less than 0,1 mm with a proportion less than 10% by weight.
  • the invention also relates to a use of this material for the manufacture of walls for armored vehicles having a mechanical resistance resistant to a pressure of the order of 1 ton / cm 2 and providing attenuation in reflection of the radar waves greater than 10 dB.
  • such a composite material can be also used for making chests of bondage or protection for armored vehicles.
  • the composite material according to the invention the advantage of replacing all the composites used on armored vehicles where a need for reduction of radar reflectivity is necessary. More radar absorption performance it has all the mechanical strength characteristics of composites used on armored vehicles.
  • the material according to the invention can be used especially to make batch chests of edge, double-roof and all double walls composites for thermal insulation and the evacuation of heat flows, for example at the back near the exhaust.
  • the composite material according to the invention is obtained without modification of the current manufacturing process existing structural composites.
  • the concept of the invention is based on the adaptation of a multilayer structure allowing the internal resonances of the different layers to obtain a significant absorption over several frequency bands. It has therefore been found that a three-layer material offers a satisfactory compromise for achieving radar absorption performance and mechanical performance.
  • a service chest made with the material according to the invention can be trampled by a man with his package, a mass of the order of 100 kg, without inducing breaks or permanent deformation, which represents a resistance to a pressure of the order of 1 tonne per cm 2 .
  • the structural composite material 1 is applied on a support 2 constituted by the wall of a armored vehicle (not shown).
  • the outer layer 3 consists of a material non-magnetic dielectric weakly reflective waves radar, low dielectric loss and endowed with a real dielectric permittivity of the order of 3. This layer must promote the penetration of the radar the impedance matching structure.
  • a layer may consist of Nylon® fibers and a epoxy resin, for example.
  • the intermediate layer 4 consists of a non-magnetic dielectric material whose losses dielectrics are more important than those in the diaper external 3, with a real dielectric permittivity of the order of 5.
  • the inner layer 5 is made of a material non-magnetic dielectric charged with carbon particles having a high electrical conductivity, and conferring to this material an absorption of electromagnetic waves more important than those of the first two layers.
  • the real dielectric permittivity of this layer is more important, of the order of 15 to 20.
  • the material 1 is completed in a known manner by a metal layer 6 constituted by an aluminum film of the order of 0.1 mm thick, for example.
  • Layers 4 and 5 are composites manufactured in base of epoxy resin and fiberglass fabric E.
  • the material 1 according to the invention can have a thickness of the order of 4 to 10 mm, advantageously 6.75 mm approximately.
  • the outer layers 3, intermediate 4 and internal 5 can respectively have a thickness of in the order of 1.5 to 4 mm, 0.5 to 2.5 mm and 1.5 to 3.5 mm.
  • these three layers have thicknesses 2.75 mm, 1.5 mm and 2.5 mm respectively.
  • FIGS. 2 to 4 there is shown graphically the variation of the reflection coefficient in frequency function. It can be seen that for the three band 8 to 18 GHz, 35 GHz and 94 GHz, we obtain a reflection attenuation greater than 13 dB. This mitigation performance is quite satisfactory in the intended area of use.

Landscapes

  • Laminated Bodies (AREA)
  • Aerials With Secondary Devices (AREA)
  • Radar Systems Or Details Thereof (AREA)
EP98402984A 1997-12-11 1998-11-30 Matériau composite structural absorbant les ondes radar et utilisation d'un tel matériau Expired - Lifetime EP0924798B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9715681 1997-12-11
FR9715681A FR2772520B1 (fr) 1997-12-11 1997-12-11 Materiau composite structural absorbant les ondes radar et utilisation d'un tel materiau

Publications (2)

Publication Number Publication Date
EP0924798A1 EP0924798A1 (fr) 1999-06-23
EP0924798B1 true EP0924798B1 (fr) 2005-01-26

Family

ID=9514465

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402984A Expired - Lifetime EP0924798B1 (fr) 1997-12-11 1998-11-30 Matériau composite structural absorbant les ondes radar et utilisation d'un tel matériau

Country Status (7)

Country Link
US (1) US6111534A (es)
EP (1) EP0924798B1 (es)
AT (1) ATE288139T1 (es)
CA (1) CA2254314C (es)
DE (1) DE69828759T2 (es)
ES (1) ES2232924T3 (es)
FR (1) FR2772520B1 (es)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6224982B1 (en) * 1999-12-21 2001-05-01 Lockhead Martin Corporation Normal incidence multi-layer elastomeric radar absorber
DE10004706B4 (de) * 2000-02-03 2005-12-22 Epcos Ag Schichtstapel für einen Elektrolyt-Kondensator
SE523348C2 (sv) * 2002-08-15 2004-04-13 Totalfoersvarets Forskningsins Genomsynlig ruta med radarreflekterande egenskaper
US8689671B2 (en) 2006-09-29 2014-04-08 Federal-Mogul World Wide, Inc. Lightweight armor and methods of making
DE102007003999A1 (de) * 2007-01-26 2008-08-07 Diehl Bgt Defence Gmbh & Co. Kg Strahlungsfilter
US7834799B1 (en) 2008-05-23 2010-11-16 Composite Engineering, Inc. System and method for fabricating composite laminate structures with co-laminated radar absorbing material
TWI369943B (en) * 2009-09-23 2012-08-01 Univ Nat Taiwan Electromagnetic wave absorption component and electromagnetic wave absorption device
PE20150113A1 (es) * 2012-03-30 2015-02-19 Micromag 2000 Sl Atenuador de radiacion electromagnetica
US9608321B2 (en) * 2013-11-11 2017-03-28 Gogo Llc Radome having localized areas of reduced radio signal attenuation
US9263800B2 (en) 2013-12-27 2016-02-16 Toyota Motor Engineering & Manufacturing North America, Inc. Artificial skin for radar mannequins
CN104197785A (zh) * 2014-09-02 2014-12-10 零八一电子集团四川红轮机械有限公司 防弹防爆电磁屏蔽方舱壁板
CN104527175A (zh) * 2014-12-15 2015-04-22 沈阳航空航天大学 一种纳米吸波薄膜功能化改性复合材料层压板的方法
CN104763099B (zh) * 2015-03-06 2017-07-07 中国人民解放军国防科学技术大学 具有雷达隐身功能的方舱大板及其制备方法
EP3481684B1 (en) * 2016-07-08 2023-12-06 Dynamic Research, Inc. Improvements to a soft collision partner (aka soft car) used in system for testing crash avoidance technologies
CN111516340B (zh) * 2020-07-03 2020-09-22 宁波曙翔新材料股份有限公司 一种隐身抗毁屏蔽材料及其制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3117245A1 (de) * 1981-04-30 1982-11-18 Bayer Ag, 5090 Leverkusen Verwendung textiler metallisierter polwaren als mikrowellenabsorber

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL244508A (es) * 1958-12-04
FR1357823A (fr) * 1963-03-01 1964-04-10 Csf Enveloppes pour récepteurs et émetteurs hyperfréquence
US3938152A (en) * 1963-06-03 1976-02-10 Mcdonnell Douglas Corporation Magnetic absorbers
US3680107A (en) * 1967-04-11 1972-07-25 Hans H Meinke Wide band interference absorber and technique for electromagnetic radiation
US3631492A (en) * 1968-10-09 1971-12-28 Kunihiro Suetake Multilayer wave absorbing wall
US3737903A (en) * 1970-07-06 1973-06-05 K Suetake Extremely thin, wave absorptive wall
DE3307066A1 (de) * 1983-03-01 1984-09-13 Dornier Gmbh, 7990 Friedrichshafen Mehrschichtiger faserverbundwerkstoff
JPH02142200A (ja) * 1988-11-22 1990-05-31 Akzo Kashima Ltd 電波吸収体
US5017939A (en) * 1989-09-26 1991-05-21 Hughes Aircraft Company Two layer matching dielectrics for radomes and lenses for wide angles of incidence
GB2257302A (en) * 1991-06-28 1993-01-06 Grace Nv Chiral absorber
KR930011548B1 (ko) * 1991-08-13 1993-12-10 한국과학기술연구원 적층형 전파흡수체

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3117245A1 (de) * 1981-04-30 1982-11-18 Bayer Ag, 5090 Leverkusen Verwendung textiler metallisierter polwaren als mikrowellenabsorber

Also Published As

Publication number Publication date
DE69828759T2 (de) 2006-05-18
US6111534A (en) 2000-08-29
DE69828759D1 (de) 2005-03-03
EP0924798A1 (fr) 1999-06-23
FR2772520B1 (fr) 2000-01-14
CA2254314A1 (fr) 1999-06-11
CA2254314C (fr) 2006-08-08
ATE288139T1 (de) 2005-02-15
FR2772520A1 (fr) 1999-06-18
ES2232924T3 (es) 2005-06-01

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