EP1852938B1 - Radome d'antenne - Google Patents
Radome d'antenne Download PDFInfo
- Publication number
- EP1852938B1 EP1852938B1 EP06252392A EP06252392A EP1852938B1 EP 1852938 B1 EP1852938 B1 EP 1852938B1 EP 06252392 A EP06252392 A EP 06252392A EP 06252392 A EP06252392 A EP 06252392A EP 1852938 B1 EP1852938 B1 EP 1852938B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- reinforced polypropylene
- radome
- layer
- self
- 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.)
- Not-in-force
Links
- 239000004743 Polypropylene Substances 0.000 claims abstract description 34
- -1 polypropylene Polymers 0.000 claims abstract description 24
- 229920001155 polypropylene Polymers 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000012792 core layer Substances 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 4
- 238000006731 degradation reaction Methods 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims 3
- 239000000463 material Substances 0.000 description 25
- 239000004810 polytetrafluoroethylene Substances 0.000 description 13
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 13
- 239000004616 structural foam Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000004643 cyanate ester Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 238000012356 Product development Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Images
Classifications
-
- 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
- H01Q1/424—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material comprising a layer of expanded material
-
- 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
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.
- EP-A-0155599 discloses a radome.
- 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 1b 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.
- first PP-PP outer layer 4 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".
- 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)
Claims (13)
- Dôme (1) pour antenne comprenant:une fenêtre électromagnétique faisant partie du dôme, à travers laquelle passent des signaux électromagnétiques en cours d'usage, caractérisé en ce qu'une couche (3) de paroi de la fenêtre électromagnétique est réalisée en polypropylène PP-PP auto-renforcé.
- Dôme (1) selon la revendication 1, caractérisé en ce que le dôme est destiné à recevoir plusieurs antennes.
- Dôme (1) selon la revendication 1 ou 2, caractérisé en ce que le polypropylène PP-PP auto-renforcé est un polypropylène auto-renforcé non chargé carbone.
- Dôme (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la fenêtre électromagnétique faisant partie du dôme comporte par ailleurs des moyens de protection du polypropylène PP-PP auto-renforcé contre la dégradation par les rayons ultraviolets.
- Dôme (1) selon la revendication 4, caractérisé en ce que les moyens de protection du polypropylène PP-PP auto-renforcé contre la dégradation par les rayons ultraviolets comportent une couche superficielle, cette couche superficielle comprenant une pellicule superficielle pigmentée et une couche superficielle peinte.
- Dôme (1) selon la revendication 5, caractérisé en ce que la couche superficielle comprend du carbone.
- Dôme (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la fenêtre électromagnétique faisant partie du dôme est courbée.
- Dôme (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que le dôme est de forme essentiellement conique.
- Dôme (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que la fenêtre électromagnétique comporte des couches multiples.
- Dôme (1) selon la revendication 9, caractérisé en ce que les couches multiples comportent deux couches extérieures de polypropylène PP-PP auto-renforcé formées de part et d'autre d'une première couche de mousse.
- Dôme (1) selon la revendication 10, caractérisé en ce que le dôme comporte par ailleurs une couche intérieure de polypropylène PP-PP auto-renforcé et une deuxième couche de mousse, la fenêtre électromagnétique étant disposée de manière à ce que la couche intérieure de polypropylène PP-PP auto-renforcé soit formée entre les première et deuxième couches de mousse.
- Utilisation de polypropylène PP-PP auto-renforcé dans un dôme (1) pour antenne.
- Utilisation de polypropylène PP-PP auto-renforcé dans une fenêtre électromagnétique faisant partie d'un dôme pour antenne, à travers laquelle passent des signaux électromagnétiques en cours d'usage.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06252392A EP1852938B1 (fr) | 2006-05-05 | 2006-05-05 | Radome d'antenne |
ES06252392T ES2344715T3 (es) | 2006-05-05 | 2006-05-05 | Radomo de antena. |
DE602006013425T DE602006013425D1 (de) | 2006-05-05 | 2006-05-05 | Antennengehäuse |
AT06252392T ATE463859T1 (de) | 2006-05-05 | 2006-05-05 | Antennengehäuse |
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 EP1852938A1 (fr) | 2007-11-07 |
EP1852938B1 true EP1852938B1 (fr) | 2010-04-07 |
Family
ID=37024969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06252392A Not-in-force 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 (6)
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 |
WO2022002888A1 (fr) | 2020-06-29 | 2022-01-06 | Sabic Global Technologies B.V. | Composition à base de polypropylène à couleur claire |
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 |
WO2022180266A1 (fr) | 2021-02-26 | 2022-09-01 | Sabic Global Technologies B.V. | Boîtier d'antenne 5g à propriétés ignifuges |
WO2024105145A1 (fr) | 2022-11-18 | 2024-05-23 | Sabic Global Technologies B.V. | Conteneur d'expédition |
EP4296708A4 (fr) * | 2021-02-19 | 2024-07-17 | Asahi Chemical Ind | Couvercle |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007062945A1 (de) * | 2007-12-21 | 2009-06-25 | Rehau Ag + Co. | Karosserie-Kunststoffbauteil für ein Kraftfahrzeug sowie dessen Verwendung |
JP6171204B2 (ja) * | 2010-12-14 | 2017-08-02 | 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 |
KR20140009348A (ko) * | 2011-02-17 | 2014-01-22 | 디에스엠 아이피 어셋츠 비.브이. | 향상된 송신-에너지 물질 및 그의 제조 방법 |
JP5892352B2 (ja) | 2011-03-22 | 2016-03-23 | ディーエスエム アイピー アセッツ ビー.ブイ. | インフレータブルレードーム |
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 |
IL258815B (en) | 2015-10-21 | 2022-08-01 | Paua Trading Ltd | Bag or cover for leisure equipment |
US11627787B2 (en) | 2017-04-27 | 2023-04-18 | Paua Trading Limited | Protective case or cover |
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 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3410501C2 (de) * | 1984-03-22 | 1990-09-13 | Dornier System Gmbh, 7990 Friedrichshafen | Radomwerkstoff |
GB8817885D0 (en) * | 1988-07-27 | 1988-09-01 | British Telecomm | Antenna |
-
2006
- 2006-05-05 DE DE602006013425T patent/DE602006013425D1/de active Active
- 2006-05-05 AT AT06252392T patent/ATE463859T1/de not_active IP Right Cessation
- 2006-05-05 ES ES06252392T patent/ES2344715T3/es active Active
- 2006-05-05 EP EP06252392A patent/EP1852938B1/fr not_active Not-in-force
Cited By (6)
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 |
WO2022002888A1 (fr) | 2020-06-29 | 2022-01-06 | Sabic Global Technologies B.V. | Composition à base de polypropylène à couleur claire |
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 |
EP4296708A4 (fr) * | 2021-02-19 | 2024-07-17 | Asahi Chemical Ind | Couvercle |
WO2022180266A1 (fr) | 2021-02-26 | 2022-09-01 | Sabic Global Technologies B.V. | Boîtier d'antenne 5g à propriétés ignifuges |
WO2024105145A1 (fr) | 2022-11-18 | 2024-05-23 | Sabic Global Technologies B.V. | Conteneur d'expédition |
Also Published As
Publication number | Publication date |
---|---|
ES2344715T3 (es) | 2010-09-03 |
DE602006013425D1 (de) | 2010-05-20 |
ATE463859T1 (de) | 2010-04-15 |
EP1852938A1 (fr) | 2007-11-07 |
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