EP1852938A1 - Radome d'antenne - Google Patents

Radome d'antenne Download PDF

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Publication number
EP1852938A1
EP1852938A1 EP06252392A EP06252392A EP1852938A1 EP 1852938 A1 EP1852938 A1 EP 1852938A1 EP 06252392 A EP06252392 A EP 06252392A EP 06252392 A EP06252392 A EP 06252392A EP 1852938 A1 EP1852938 A1 EP 1852938A1
Authority
EP
European Patent Office
Prior art keywords
housing
reinforced polypropylene
radome
housing according
layer
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
Application number
EP06252392A
Other languages
German (de)
English (en)
Other versions
EP1852938B1 (fr
Inventor
Peter A. C. Mcnair
Claire Baker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Meggitt Advanced Composites Ltd
Original Assignee
Cobham Advanced Composites Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cobham Advanced Composites Ltd filed Critical Cobham Advanced Composites Ltd
Priority to DE602006013425T priority Critical patent/DE602006013425D1/de
Priority to EP06252392A priority patent/EP1852938B1/fr
Priority to AT06252392T priority patent/ATE463859T1/de
Priority to ES06252392T priority patent/ES2344715T3/es
Publication of EP1852938A1 publication Critical patent/EP1852938A1/fr
Application granted granted Critical
Publication of EP1852938B1 publication Critical patent/EP1852938B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/42Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • H01Q1/424Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material comprising a layer of expanded material
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/42Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material

Definitions

  • Antenna housings are an essential part of most radar and/or communication/control systems, providing protection for antennas from the environment, necessary aerodynamic characteristics and improved RF stealth.
  • radome generally refers to housings for an antenna or collection of antennas. Antennas generally do not “look” through every part of a radome and the area through which signals are passed (transmitted and/or received) is termed the "electromagnetic window". In order to ensure optimum electrical performance, the design and/or material of this electromagnetic window may differ compared to more structural parts of a radome.
  • Thermosetting composite materials are currently used for the manufacture of high performance radomes, such as aircraft nose cones.
  • quartz fibre reinforced cyanate ester composites are very high cost materials.
  • lower cost glass fibre reinforced epoxy composites are used.
  • PTFE polytetrafluoroethylene
  • the use of PTFE often sacrifices mechanical performance.
  • mechanical performance cannot be met with a solid PTFE radome, it may be possible to use a hybrid build, where PTFE is used in the window area but the radome structure is of a stronger material, but again a trade-off must be made in this case.
  • the present invention seeks to overcome the aforementioned problems.
  • a housing for an antenna comprising:
  • the present invention provides the use of self reinforced polypropylene (PP-PP) in a housing for an antenna.
  • PP-PP self reinforced polypropylene
  • PP-PP Self reinforced polypropylene
  • PP-PP Self reinforced polypropylene
  • radomes antenna housings
  • Standard grade PP-PP material contains carbon black to protect against UV degradation of the polymer.
  • the introduction of carbon black through the bulk of the material is not desirable for radomes because it increases electrical loss: carbon heats up in response to electromagnetic radiation and the strength of transmitted and received electromagnetic signals is correspondingly diminished.
  • non-carbon loaded PP-PP material is appropriate in such cases.
  • radomes For most applications, protection against UV degradation is necessary for radomes and is typically achieved either by introduction of a pigmented surface film, by introduction of an alternative additive (either to the radome material itself or to a surface layer such as a paint), or by painting the radome, as opposed to the use of carbon black containing PP-PP.
  • Optimisation of this finishing and protection scheme may form part of the product development cycle and testing for radomes.
  • a relatively thin surface layer of carbon is preferable as a static dissipative layer, which is, for example, introduced as a carbon containing film. Paint is also an option and is typical for current radome designs.
  • the use of thermoplastic films to provide a surface finish is possible in PP-PP applications.
  • radome applications do not require high performance (e.g. low frequency, short range applications) and in this case the radome may be produced with standard, lower cost, carbon-containing PP-PP.
  • the dielectric constant and electrical loss are important design parameters.
  • An electromagnetic wave takes longer to pass through a given region with a dielectric constant greater than unity (1), than through the same region of air.
  • the delay is proportional to the refractive index of the material (which in turn equals the square root of the dielectric constant). This delay is particularly significant when considering the performance of a curved radome, in which different parts of an incident electromagnetic field are potentially delayed by different amounts, leading to defocussing effects and/or beam deflection.
  • the electrical loss provides a measure of the proportion of electromagnetic energy lost as heat.
  • "Lossy" radome materials reduce the strength of transmitted and received electromagnetic signals, necessitating higher power transmitters and/or lower noise receivers. Although all radome materials are lossy to some degree, materials such as PTFE and PP-PP are described as “low loss” and offer superior performance.
  • PP-PP represents a bridge in mechanical properties between the "conventional" radome materials of e.g. glass fibre reinforced plastics and homogenous polymers such as PTFE and PP.
  • PP-PP radomes are suitable for a number of semi-structural applications.
  • PP-PP is also a relatively low cost material, and can be used to manufacture radomes where PTFE has been ruled out due to poor mechanical performance.
  • Radomes range in size from smaller than egg-cups to large geodesic dome structures such as ground stations, and are used in fields such as vehicle applications (including ground based and air vehicles).
  • Figure 1 a shows a cross-section through an example of a radome wall 1 (for example, for use as a nose cone for a missile / fast jet application).
  • Figure 1 b illustrates an example of a more complex radome shape 2.
  • the use of PP-PP is not limited to any particular class of radome shape.
  • the simplest radome wall is a single layer 3 of PP-PP material, referred to as a "solid" radome.
  • This type of radome may be appropriate when operation at a single frequency, low frequency or over a relatively narrow band of frequencies is required.
  • Typical radome wall builds comprise three layers as shown in Figure 2b.
  • Such a radome wall comprises a first PP-PP outer layer 4, a structural foam layer 5, and a second PP-PP outer layer 6, and is referred to as an "A-sandwich”.
  • Further radome examples, shown in Figures 2c and 2d, have five layers in total. This includes a first PP-PP outer layer 4, a first structural foam layer 7, a PP-PP core 8, a second structural foam layer 9, and a second PP-PP outer layer 6, and is referred to as a "C-sandwich".
  • Other builds are possible, for example further multi-layer designs.
  • the one or more structural foam layers 5, 7, 9 have excellent electrical performance (they comprise mostly air), but poor mechanical performance.
  • the layer thicknesses are selected in order to optimise the radome performance over a range of incident angles and operating frequencies.
  • the layer thicknesses depend on the electrical (specifically the dielectric) properties of the wall materials.
  • the two main approaches are (a) to make the radome as thin as possible (known as an "electrically thin" radome) and (b) to tune the radome in some way (in the same way that anti-reflection films are used in optics, for example in the blooming of camera lens surfaces).
  • the use of PP-PP in radomes does not limit the radomes to operation at a particular frequency.
  • the radome wall builds of Figures 2a to 2d are preferably optimised for operation in the frequency band 10.95 to 12.75 GHz (Television Receive Only (TVRO) satellite band) and 0 to 75 degrees angle of incidence.
  • the builds typically range in thickness from approximately 11 mm (solid wall) to approximately 18.2 mm. Actual build dimensions depend on frequency and the use of PP-PP in radomes does not limited the radome to specific dimensions.
  • the layer thicknesses are determined so as to optimise the electrical performance of the radome.
  • the inclusion of more layers i.e. A-sandwich and C-sandwich gives better electrical performance than the simplest solid build, particularly over a wider bandwidth (range of operating frequencies).
  • C-sandwich builds give better potential electrical performance than the A-sandwich builds.
  • PP-PP can be used for any one or more of the layer(s) within any radome build.
  • builds which involve PP-PP and other materials e.g. Kevlar® or quartz cyanate ester are possible.

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)
EP06252392A 2006-05-05 2006-05-05 Radome d'antenne Expired - Lifetime EP1852938B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE602006013425T DE602006013425D1 (de) 2006-05-05 2006-05-05 Antennengehäuse
EP06252392A EP1852938B1 (fr) 2006-05-05 2006-05-05 Radome d'antenne
AT06252392T ATE463859T1 (de) 2006-05-05 2006-05-05 Antennengehäuse
ES06252392T ES2344715T3 (es) 2006-05-05 2006-05-05 Radomo de antena.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06252392A EP1852938B1 (fr) 2006-05-05 2006-05-05 Radome d'antenne

Publications (2)

Publication Number Publication Date
EP1852938A1 true EP1852938A1 (fr) 2007-11-07
EP1852938B1 EP1852938B1 (fr) 2010-04-07

Family

ID=37024969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06252392A Expired - Lifetime EP1852938B1 (fr) 2006-05-05 2006-05-05 Radome d'antenne

Country Status (4)

Country Link
EP (1) EP1852938B1 (fr)
AT (1) ATE463859T1 (fr)
DE (1) DE602006013425D1 (fr)
ES (1) ES2344715T3 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009083165A1 (fr) * 2007-12-21 2009-07-09 Rehau Ag + Co Pièce de carrosserie en plastique pour un véhicule et son utilisation
WO2012080317A1 (fr) 2010-12-14 2012-06-21 Dsm Ip Assets B.V. Matériau pour radômes et procédé de fabrication associé
WO2012110091A1 (fr) * 2011-02-17 2012-08-23 Dsm Ip Assets B.V. Matériau à énergie de transmission accrue et son procédé de fabrication
WO2012126885A1 (fr) * 2011-03-22 2012-09-27 Dsm Ip Assets B.V. Radôme gonflable
CN102709695A (zh) * 2012-06-26 2012-10-03 郴州希典科技有限公司 高透波率新型天线罩
WO2017068369A3 (fr) * 2015-10-21 2017-05-26 Paua Trading Limited Boîtier ou couvercle pour équipement de loisirs
CN108732543A (zh) * 2018-04-24 2018-11-02 南京航空航天大学 一种基于射频隐身的机载组网雷达辐射参数联合优化方法
WO2020053599A1 (fr) * 2018-09-13 2020-03-19 Paua Trading Limited Matériaux structuraux
DE102011076501B4 (de) * 2011-05-26 2021-03-25 Robert Bosch Gmbh Abdeckung für einen radarsensor für ein kraftfahrzeug
US11627787B2 (en) 2017-04-27 2023-04-18 Paua Trading Limited Protective case or cover
US11721888B2 (en) 2019-11-11 2023-08-08 Ticona Llc Antenna cover including a polymer composition having a low dielectric constant and dissipation factor

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2500055C1 (ru) * 2012-05-10 2013-11-27 Открытое акционерное общество "Обнинское научно-производственное предприятие "Технология" Антенный обтекатель
WO2022002839A1 (fr) 2020-06-29 2022-01-06 Sabic Global Technologies B.V. Composition de polymère ayant une aptitude à l'écoulement et une résistance à la chute d'un poids améliorées à basse température
WO2022002888A1 (fr) 2020-06-29 2022-01-06 Sabic Global Technologies B.V. Composition à base de polypropylène à couleur claire
WO2022176591A1 (fr) * 2021-02-19 2022-08-25 旭化成株式会社 Couvercle
US20240149567A1 (en) 2021-02-26 2024-05-09 Sabic Global Technologies B.V. 5g antenna housing with flame retardant properties
EP4140723A3 (fr) 2022-11-18 2023-05-24 SABIC Global Technologies B.V. Conteneur d'expédition

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155599A2 (fr) * 1984-03-22 1985-09-25 Dornier Gmbh Matériau pour radome
GB2221351A (en) * 1988-07-27 1990-01-31 British Telecomm Antenna

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0155599A2 (fr) * 1984-03-22 1985-09-25 Dornier Gmbh Matériau pour radome
GB2221351A (en) * 1988-07-27 1990-01-31 British Telecomm Antenna

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009083165A1 (fr) * 2007-12-21 2009-07-09 Rehau Ag + Co Pièce de carrosserie en plastique pour un véhicule et son utilisation
WO2012080317A1 (fr) 2010-12-14 2012-06-21 Dsm Ip Assets B.V. Matériau pour radômes et procédé de fabrication associé
JP2014506197A (ja) * 2010-12-14 2014-03-13 ディーエスエム アイピー アセッツ ビー.ブイ. レドーム用材料およびその製造方法
US9744741B2 (en) 2010-12-14 2017-08-29 Dsm Ip Assets B.V. Material for radomes and process for making the same
WO2012110091A1 (fr) * 2011-02-17 2012-08-23 Dsm Ip Assets B.V. Matériau à énergie de transmission accrue et son procédé de fabrication
WO2012126885A1 (fr) * 2011-03-22 2012-09-27 Dsm Ip Assets B.V. Radôme gonflable
US10199723B2 (en) 2011-03-22 2019-02-05 Dsm Ip Assets B.V. Inflatable radome
DE102011076501B4 (de) * 2011-05-26 2021-03-25 Robert Bosch Gmbh Abdeckung für einen radarsensor für ein kraftfahrzeug
CN102709695A (zh) * 2012-06-26 2012-10-03 郴州希典科技有限公司 高透波率新型天线罩
CN108882784A (zh) * 2015-10-21 2018-11-23 帕瓦贸易有限公司 用于爱好设备的箱子或罩子
GB2558156A (en) * 2015-10-21 2018-07-04 Paua Trading Ltd A case or cover for hobby equipment
US10882590B2 (en) 2015-10-21 2021-01-05 Paua Trading Limited Case or cover for hobby equipment
WO2017068369A3 (fr) * 2015-10-21 2017-05-26 Paua Trading Limited Boîtier ou couvercle pour équipement de loisirs
GB2558156B (en) * 2015-10-21 2021-09-15 Paua Trading Ltd A case or cover for hobby equipment
US11576473B2 (en) 2015-10-21 2023-02-14 Paua Trading Limited Case or cover for hobby equipment
US11931645B2 (en) 2015-10-21 2024-03-19 Paua Trading Limited Case or cover for hobby equipment
US11627787B2 (en) 2017-04-27 2023-04-18 Paua Trading Limited Protective case or cover
CN108732543A (zh) * 2018-04-24 2018-11-02 南京航空航天大学 一种基于射频隐身的机载组网雷达辐射参数联合优化方法
CN108732543B (zh) * 2018-04-24 2021-08-06 南京航空航天大学 一种基于射频隐身的机载组网雷达辐射参数联合优化方法
WO2020053599A1 (fr) * 2018-09-13 2020-03-19 Paua Trading Limited Matériaux structuraux
US11721888B2 (en) 2019-11-11 2023-08-08 Ticona Llc Antenna cover including a polymer composition having a low dielectric constant and dissipation factor

Also Published As

Publication number Publication date
EP1852938B1 (fr) 2010-04-07
ATE463859T1 (de) 2010-04-15
ES2344715T3 (es) 2010-09-03
DE602006013425D1 (de) 2010-05-20

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