EP1279204A1 - Parabolic antenna and method for making same - Google Patents

Parabolic antenna and method for making same

Info

Publication number
EP1279204A1
EP1279204A1 EP01929735A EP01929735A EP1279204A1 EP 1279204 A1 EP1279204 A1 EP 1279204A1 EP 01929735 A EP01929735 A EP 01929735A EP 01929735 A EP01929735 A EP 01929735A EP 1279204 A1 EP1279204 A1 EP 1279204A1
Authority
EP
European Patent Office
Prior art keywords
antenna
sheet
openings
electrically conductive
plastic material
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
EP01929735A
Other languages
German (de)
French (fr)
Other versions
EP1279204B1 (en
Inventor
Jean-François MAZZOCCHI
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.)
Vector Industries France
Original Assignee
Vector Industries France
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 Vector Industries France filed Critical Vector Industries France
Publication of EP1279204A1 publication Critical patent/EP1279204A1/en
Application granted granted Critical
Publication of EP1279204B1 publication Critical patent/EP1279204B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
    • H01Q15/168—Mesh reflectors mounted on a non-collapsible frame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H01Q15/142—Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface

Definitions

  • the invention relates to an antenna of the type comprising a reflector made of an electrically conductive material embedded in a plastic body.
  • the object of the present invention therefore relates to an antenna forming part of a radio transmission or reception installation designed to radiate or pick up radio waves in space. More specifically, the present invention relates to an antenna for decimetric wavelengths up to millimeter wavelengths.
  • This type of antenna consists of a powered element, said primary source, and a reflector which may have a planar, parabolic or dihedral shape. These antennas are most often in the form of a cap of a sphere or of a paraboloid of revolution, but they can also have any other shape ensuring focusing.
  • the present invention aims to overcome these drawbacks.
  • the present invention aims to provide an antenna having good technical reception characteristics, forming a structure resistant to mechanical and atmospheric constraints, this antenna being capable of being obtained by a simple, reproducible manufacturing process and guaranteeing a product of good quality.
  • the invention achieves this object by an antenna in which the reflector is made of a sheet of expanded material defining quadrilateral openings whose diagonals are perpendicular to each other.
  • the present invention also relates to the method of manufacturing such an antenna.
  • the electrically conductive material belongs to the group comprising metals, their oxides and their alloys; this electrically conductive material preferably being aluminum or steel.
  • the sheet of expanded material used to make the reflector is preferably a sheet of electrically conductive material which has a thickness of between 0.25 and 0.40 mm.
  • the sheet of expanded material is produced from a sheet pierced with slots of small length, arranged in staggered rows, this sheet being stretched in a direction perpendicular to these slots, so as to form a type of grid.
  • the slots are arranged strictly in staggered rows, so that the openings made during stretching have a diamond shape.
  • the length and arrangement of the slots made in the sheet of electrically conductive material, intended to form the sheet of expanded material advantageously have the following characteristics:
  • the large diagonal of the openings has a length of between 4.5 and 6 mm
  • the small diagonal of the openings has a length of between 3 and 4 mm
  • thermoplastic plastic material capable of being injected, in particular a plastic material belonging to the group comprising polyethylene, polypropylene, polyolefins, ABS
  • the manufacturing process of the aforementioned type comprises the following steps: a) a sheet of metal is provided, b) slots are staggered in said sheet of metal and the sheet is stretched, in a direction perpendicular to the length of the slots, to create a sheet of expanded metal, c) a stamping of said sheet of expanded metal is carried out under a press in order to cut it and give it the desired volume so as to obtain a deflector, d) positioning said deflector in the mold d injection, e) thermoplastic material is injected into said mold so as to coat said deflector in a body, and f) said antenna is removed from the mold.
  • FIG. 1 is a front elevation view of the antenna according to the present invention
  • FIG. 2 is a sectional view in the direction ll-ll of FIG. 1,
  • FIG. 3 is a sectional view of the antenna, object of the present invention, in the direction III-III of FIG. 1,
  • FIG. 4 is an enlargement of detail IV of FIG. 1, and
  • FIG. 5 and 6 show a detail of the antenna according to an alternative embodiment.
  • FIG. 7 is a view similar to that of FIG. 1 for another alternative embodiment of the antenna according to the present invention.
  • FIG. 8 is an enlarged partial view of the antenna in the direction VIII-VIII of Figure 7.
  • an antenna 10 according to the present invention having a shape of a dish cap, therefore circular in shape from its front and back sides.
  • This antenna 10 is provided, at its periphery, with an edge 11 forming a rim turned in the direction of the rear of the antenna as can be seen more clearly in FIGS. 2 and 3.
  • the body 14 of the antenna 10 forms a paraboloid cap of 15 which is surrounded by the edge 11 (see FIG. 3).
  • This reflector 12 is therefore formed of a sort of grid, the strips 15, of width I, come from an initially full sheet which has been stretched in the direction of the small diagonal after cutting the slots in the direction of the large diagonal D.
  • This reflector 12 is embedded in a body 14 made of plastic which protects the reflector 12, in particular from corrosion.
  • the body 14 is produced in a single piece which comprises a sleeve 16.
  • This sleeve 16 has an opening which is intended to receive the support arm of the powered element which is capable of being connected directly to the transmitter or to the receiver associated with the antenna. As can be seen in FIG. 1, this sleeve 16 is preferably located at the periphery of the antenna 10, at the edge 11.
  • the aforementioned powered element comprises an arm which will be inserted into the sleeve 16, this the latter having an orientation which, combined with the length of the arm, will determine the focal distance of the antenna.
  • the sleeve 16 has an external shape in the form of a truncated pyramid, its opening being of cylindrical shape, of rectangular section.
  • the aforementioned arm can be fixed using a nozzle having a shape complementary to that of the sleeve 16.
  • FIGS. 5 and 6 is illustrated an alternative embodiment of the sleeve bearing a reference numeral 16 ′, the shape of this sleeve 16 'being that of a pyramid trunk with a rectangular base.
  • the sleeve 16 or 16 ′ intended to receive the support arm of the powered element and which formed an external radial extension of the edge 11 of the body 14 of the antenna 10 made of injected plastic material is now replaced by an opening 16 "of substantially square section located in the peripheral part of the paraboloid cap 15.
  • the concave face of the paraboloid cap 15 carries three diametrical ribs 20 forming between them an angle at the center of about 60 ° These ribs 20 are derived from the shape of the mold and are intended to provide mechanical reinforcement of the antenna 10 .
  • the antenna 10 is provided with several zones 18 (four in the figures) arranged substantially in the central part of the antenna and having a deformation set back relative to the concave face of the antenna. These zones 18 are pierced in the middle by an orifice and are intended for fixing the antenna 10 on a support.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Aerials With Secondary Devices (AREA)
  • Details Of Aerials (AREA)

Abstract

The invention concerns an antenna (10) comprising a reflector made of an electrically conductive material coated in a body made of plastic material. The invention is characterised in that said reflector is produced in a sheet of unfolded material defining openings with a quadrilateral shape whereof the diagonals are mutually perpendicular.

Description

Antenne parabolique et son procédé de fabrication Satellite dish and its manufacturing process
L'invention concerne une antenne du type comprenant un réflecteur en un matériau conducteur de l'électricité enrobé dans un corps en matière plastique.The invention relates to an antenna of the type comprising a reflector made of an electrically conductive material embedded in a plastic body.
L'objet de la présente invention concerne donc une antenne formant une partie d'une installation radioélectrique d'émission ou de réception conçue en vue de rayonner ou de capter des ondes radioélectriques dans l'espace. Plus précisément, la présente invention concerne une antenne pour les longueurs d'ondes décimétriques jusqu'aux longueurs d'ondes millimétriques. Ce type d'antenne est constitué d'un élément alimenté, dit source primaire, et d'un réflecteur pouvant présenter une forme plan, parabolique ou en dièdre. Ces antennes sont le plus souvent en forme de calotte d'une sphère ou d'un paraboloïde de révolution mais elles peuvent présenter aussi toute autre forme assurant une focalisation.The object of the present invention therefore relates to an antenna forming part of a radio transmission or reception installation designed to radiate or pick up radio waves in space. More specifically, the present invention relates to an antenna for decimetric wavelengths up to millimeter wavelengths. This type of antenna consists of a powered element, said primary source, and a reflector which may have a planar, parabolic or dihedral shape. These antennas are most often in the form of a cap of a sphere or of a paraboloid of revolution, but they can also have any other shape ensuring focusing.
On connaît déjà, notamment du document EP 0 595 418, une antenne constituée d'un grillage réalisé en un matériau conducteur de l'électricité, ce grillage étant enrobé de matière plastique. Toutefois, ce type d'antenne présente de nombreux inconvénients, que ce soit en terme de procédé de fabrication ou en terme de performance. En effet, un grillage formé de fils entrecroisés et entrelacés pour former des mailles constitue un élément déformable qui, lorsqu'il est mis en forme (découpe et emboutissage) pour former un réflecteur, présente des dimensions de maille non homogènes entraînant, pour le produit final, de mauvaises caractéristiques techniques de réception du fait des défauts se trouvant dans ce déflecteur.Already known, in particular from document EP 0 595 418, is an antenna made up of a mesh made of an electrically conductive material, this mesh being coated with plastic. However, this type of antenna has many drawbacks, whether in terms of manufacturing process or in terms of performance. Indeed, a mesh formed of intertwined and interlaced wires to form meshes constitutes a deformable element which, when it is shaped (cutting and stamping) to form a reflector, has non-homogeneous mesh dimensions entailing, for the product final, poor technical reception characteristics due to the faults in this deflector.
La présente invention vise à palier ces inconvénients.The present invention aims to overcome these drawbacks.
A cet effet, la présente invention vise à fournir une antenne présentant de bonnes caractéristiques techniques de réception, formant une structure résistante aux contraintes mécaniques et atmosphériques, cette antenne étant susceptible d'être obtenue par un procédé de fabrication simple, reproductible et garantissant un produit de bonne qualité. L'invention atteint ce but par une antenne dans laquelle le réflecteur est réalisé dans une feuille de matériau déployé définissant des ouvertures en forme de quadrilatère dont les diagonales sont perpendiculaires entre elles.To this end, the present invention aims to provide an antenna having good technical reception characteristics, forming a structure resistant to mechanical and atmospheric constraints, this antenna being capable of being obtained by a simple, reproducible manufacturing process and guaranteeing a product of good quality. The invention achieves this object by an antenna in which the reflector is made of a sheet of expanded material defining quadrilateral openings whose diagonals are perpendicular to each other.
On constate en effet que l'utilisation d'une feuille de matériau déployé permet l'obtention d'un réflecteur présentant des caractéristiques de maille constante qui garantissent de bonnes caractéristiques techniques de réception et une reproductibilité de fabrication.It is in fact observed that the use of a sheet of expanded material makes it possible to obtain a reflector having characteristics of constant mesh which guarantee good technical characteristics of reception and reproducibility of manufacture.
La présente invention concerne également le procédé de fabrication d'une telle antenne.The present invention also relates to the method of manufacturing such an antenna.
Il est de préférence prévu que le matériau conducteur de l'électricité appartient au groupe comprenant les métaux, leurs oxydes et leurs alliages ; ce matériau conducteur d'électricité étant, de manière préférentielle, de l'aluminium ou de l'acier.It is preferably provided that the electrically conductive material belongs to the group comprising metals, their oxides and their alloys; this electrically conductive material preferably being aluminum or steel.
La feuille de matériau déployé utilisée pour réaliser le réflecteur est de préférence une feuille en matériau conducteur de l'électricité qui présente une épaisseur située entre 0,25 et 0,40 mm.The sheet of expanded material used to make the reflector is preferably a sheet of electrically conductive material which has a thickness of between 0.25 and 0.40 mm.
De manière classique, la feuille de matériau déployé est réalisée à partir d'une feuille percée de fentes de petite longueur, disposées en quinconce, cette feuille étant étirée en direction perpendiculaire à ces fentes, de façon à former un type de grillage. De manière avantageuse, les fentes sont disposées strictement en quinconce, de sorte que les ouvertures réalisées lors de Pétirement présentent une forme de losange.Conventionally, the sheet of expanded material is produced from a sheet pierced with slots of small length, arranged in staggered rows, this sheet being stretched in a direction perpendicular to these slots, so as to form a type of grid. Advantageously, the slots are arranged strictly in staggered rows, so that the openings made during stretching have a diamond shape.
La longueur et la disposition des fentes réalisées dans la feuille de matériau conducteur de l'électricité, destinée à former la feuille de matériau déployé, présentent avantageusement les caractéristiques suivantes :The length and arrangement of the slots made in the sheet of electrically conductive material, intended to form the sheet of expanded material, advantageously have the following characteristics:
- la grande diagonale des ouvertures présente une longueur comprise entre 4,5 et 6 mm,- the large diagonal of the openings has a length of between 4.5 and 6 mm,
- la petite diagonale des ouvertures présente une longueur comprise entre 3 et 4 mm, etthe small diagonal of the openings has a length of between 3 and 4 mm, and
- entre les ouvertures subsiste entre 0,25 et 0,5 mm de matière constituant les lanières du grillage destiné à former le réflecteur.- between the openings remains between 0.25 and 0.5 mm of material constituting the strips of the mesh intended to form the reflector.
L'obtention des meilleurs résultats de réception de l'antenne selon la présente invention a été constatée, pour une antenne présentant un diamètre de 85 cm, avec un réflecteur dont les ouvertures en forme de losange comportent une grande diagonale présentant une longueur de 6 mm, une petite diagonale présentant une longueur de 3,4 mm et 0,3 mm de matière subsistant entre les ouvertures (largeur des lanières précitées).Obtaining the best reception results from the antenna according to the present invention has been observed, for an antenna having a diameter of 85 cm, with a reflector whose diamond-shaped openings have a large diagonal having a length of 6 mm, a small diagonal having a length of 3.4 mm and 0.3 mm of material remaining between the openings (width of the aforementioned strips).
Comme matière plastique constituant le corps de l'antenne, on pourra utiliser toute matière plastique thermoplastique susceptible d'être injectée, notamment une matière plastique appartenant au groupe comprenant le polyéthylène, le polypropylène, les polyoléfines, les ABSAs the plastic material constituting the body of the antenna, it is possible to use any thermoplastic plastic material capable of being injected, in particular a plastic material belonging to the group comprising polyethylene, polypropylene, polyolefins, ABS
(terpolymère d'acronitrile, de butadiène et de styrène), les polycarbonates et le poly(méthacrylate de méthyle). L'utilisation d'une feuille de matériau déployé pour la réalisation du réflecteur de l'antenne apporte un autre avantage constitué par le fait que cette structure de réflecteur, formant un grillage très fin, constitue une structure quasi-invisible dès qu'un observateur est situé à une certaine distance de l'antenne. Afin de tirer partie de cet avantage, il est avantageusement prévu que la matière plastique formant le corps de l'antenne soit transparente. Notamment, on peut utiliser du polyméthacrylate de méthyle, en particulier du "Plexiglass" (marque déposée).(acritritrile, butadiene and styrene terpolymer), polycarbonates and poly (methyl methacrylate). The use of a sheet of deployed material for the realization of the antenna reflector brings another advantage constituted by the fact that this reflector structure, forming a very fine grid, constitutes a quasi-invisible structure as soon as an observer is located at a certain distance from the antenna. In order to take advantage of this advantage, it is advantageously provided that the plastic material forming the body of the antenna is transparent. In particular, polymethyl methacrylate can be used, in particular "Plexiglass" (registered trademark).
De cette manière, il est possible d'obtenir une antenne que l'on peut qualifier de transparente et qui, de ce fait, s'intègre de manière très naturelle dans l'environnement.In this way, it is possible to obtain an antenna which can be described as transparent and which, therefore, integrates very naturally in the environment.
Le procédé de fabrication du type précité comporte les étapes suivantes : a) on fournit une feuille de métal, b) on réalise des fentes en quinconce dans ladite feuille de métal et on étire ladite feuille, selon une direction perpendiculaire à la longueur des fentes, pour créer une feuille de métal déployé, c) on réalise un emboutissage sous presse de ladite feuille de métal déployé afin de la découper et de lui donner le volume souhaité de façon à obtenir un déflecteur, d) on positionne ledit déflecteur dans le moule d'injection, e) on injecte de la matière thermoplastique dans ledit moule de façon à enrober ledit déflecteur dans un corps, et f) on démoule ladite antenne. L'invention sera mieux comprise, les caractéristiques secondaires et leurs avantages apparaîtront au cours de la description d'un mode de réalisation donnée ci-dessous à titre d'exemple.The manufacturing process of the aforementioned type comprises the following steps: a) a sheet of metal is provided, b) slots are staggered in said sheet of metal and the sheet is stretched, in a direction perpendicular to the length of the slots, to create a sheet of expanded metal, c) a stamping of said sheet of expanded metal is carried out under a press in order to cut it and give it the desired volume so as to obtain a deflector, d) positioning said deflector in the mold d injection, e) thermoplastic material is injected into said mold so as to coat said deflector in a body, and f) said antenna is removed from the mold. The invention will be better understood, the secondary characteristics and their advantages will appear during the description of an embodiment given below by way of example.
Il est entendu que la description et les dessins ne sont donnés qu'à titre indicatif et non limitatif.It is understood that the description and the drawings are given for information only and are not limiting.
Il sera fait référence aux dessins annexés, dans lesquels :Reference will be made to the accompanying drawings, in which:
- la figure 1 est une vue en élévation de face de l'antenne selon la présente invention,FIG. 1 is a front elevation view of the antenna according to the present invention,
- la figure 2 est une vue en coupe suivant la direction ll-ll de la figure 1 ,FIG. 2 is a sectional view in the direction ll-ll of FIG. 1,
- la figure 3 est une vue en coupe de l'antenne, objet de la présente invention, selon la direction lll-lll de la figure 1 ,FIG. 3 is a sectional view of the antenna, object of the present invention, in the direction III-III of FIG. 1,
- la figure 4 est un agrandissement du détail IV de la figure 1 , etFIG. 4 is an enlargement of detail IV of FIG. 1, and
- les figures 5 et 6 représentent un détail de l'antenne suivant une variante de réalisation.- Figures 5 and 6 show a detail of the antenna according to an alternative embodiment.
- la figure 7 est une vue similaire à celle de la figure 1 pour une autre alternative de réalisation de l'antenne selon la présente invention, etFIG. 7 is a view similar to that of FIG. 1 for another alternative embodiment of the antenna according to the present invention, and
- la figure 8 est une vue partielle agrandie de l'antenne selon la direction VIII-VIII de la figure 7. Sur la figure 1 , est visible une antenne 10 selon la présente invention présentant une forme de calotte de paraboloïde, donc de forme circulaire depuis ses faces avant et arrière. Cette antenne 10 est munie, à sa périphérie, d'un bord 11 formant un rebord tourné en direction de l'arrière de l'antenne comme on peut le voir de manière plus claire sur les figures 2 et 3. Dans sa majeure partie, le corps 14 de l'antenne 10 forme une calotte de paraboloïde de 15 qui est entourée par le bord 11 (voir figure 3).- Figure 8 is an enlarged partial view of the antenna in the direction VIII-VIII of Figure 7. In Figure 1, is visible an antenna 10 according to the present invention having a shape of a dish cap, therefore circular in shape from its front and back sides. This antenna 10 is provided, at its periphery, with an edge 11 forming a rim turned in the direction of the rear of the antenna as can be seen more clearly in FIGS. 2 and 3. For the most part, the body 14 of the antenna 10 forms a paraboloid cap of 15 which is surrounded by the edge 11 (see FIG. 3).
Si l'on se reporte à la figure 4 représentant de manière très agrandie la structure de l'antenne, on retrouve le réflecteur 12 appartenant à toute la surface de l'antenne 11 et issu d'une feuille de matériau, de préférence de métal déployé dont les ouvertures 13 en forme de losange présentent une grande diagonale D, une petite diagonale d.If we refer to Figure 4 very enlarged showing the structure of the antenna, we find the reflector 12 belonging to the entire surface of the antenna 11 and from a sheet of material, preferably metal deployed whose diamond-shaped openings 13 have a large diagonal D, a small diagonal d.
Ce réflecteur 12 est donc formé d'une sorte de grillage dont les lanières 15, de largeur I, sont issues d'une feuille initialement pleine qui a été étirée suivant la direction de la petite diagonale d après découpe de fentes selon la direction de la grande diagonale D. Ce réflecteur 12 est noyé dans un corps 14 réalisé en matière plastique qui protège le réflecteur 12, notamment de la corrosion.This reflector 12 is therefore formed of a sort of grid, the strips 15, of width I, come from an initially full sheet which has been stretched in the direction of the small diagonal after cutting the slots in the direction of the large diagonal D. This reflector 12 is embedded in a body 14 made of plastic which protects the reflector 12, in particular from corrosion.
Selon une avantageuse disposition, lors du procédé de fabrication de l'antenne 10, et plus précisément lors de l'injection de la matière plastique constituant le corps 14 autour du réflecteur 12, on réalise le corps 14 en une seule pièce qui comporte un manchon 16.According to an advantageous arrangement, during the method of manufacturing the antenna 10, and more precisely during the injection of the plastic material constituting the body 14 around the reflector 12, the body 14 is produced in a single piece which comprises a sleeve 16.
Ce manchon 16 comporte une ouverture qui est destinée à recevoir le bras de support de l'élément alimenté qui est apte à être relié directement à l'émetteur ou au récepteur associé à l'antenne. Comme on peut le voir sur la figure 1 , ce manchon 16 est de préférence situé à la périphérie de l'antenne 10, au niveau du bord 11. L'élément alimenté précité comporte un bras qui va être inséré dans le manchon 16, ce dernier présentant une orientation qui, combinée à la longueur du bras, va déterminer la distance focale de l'antenne. Dans le cas de la figure 1 , le manchon 16 présente une forme externe en forme de tronc de pyramide, son ouverture étant de forme cylindrique, de section rectangulaire.This sleeve 16 has an opening which is intended to receive the support arm of the powered element which is capable of being connected directly to the transmitter or to the receiver associated with the antenna. As can be seen in FIG. 1, this sleeve 16 is preferably located at the periphery of the antenna 10, at the edge 11. The aforementioned powered element comprises an arm which will be inserted into the sleeve 16, this the latter having an orientation which, combined with the length of the arm, will determine the focal distance of the antenna. In the case of FIG. 1, the sleeve 16 has an external shape in the form of a truncated pyramid, its opening being of cylindrical shape, of rectangular section.
La fixation du bras précité pourra s'effectuer à l'aide d'un embout présentant une forme complémentaire de celle du manchon 16. Sur les figures 5 et 6 est illustrée une variante de réalisation du manchon portant une référence numérique 16', la forme de ce manchon 16' étant celle d'un tronc de pyramide à base rectangulaire.The aforementioned arm can be fixed using a nozzle having a shape complementary to that of the sleeve 16. In FIGS. 5 and 6 is illustrated an alternative embodiment of the sleeve bearing a reference numeral 16 ′, the shape of this sleeve 16 'being that of a pyramid trunk with a rectangular base.
Dans le cas de l'alternative de réalisation illustrée sur les figures 7 et 8, le manchon 16 ou 16' destiné à recevoir le bras de support de l'élément alimenté et qui formait une prolongation radiale extérieure du bord 11 du corps 14 de l'antenne 10 en matière plastique injectée (voir figure 3) est maintenant remplacé par une ouverture 16" de section sensiblement carrée située dans la partie périphérique de la calotte de paraboloïde 15. En outre, on prévoit dans ce cas que, de préférence, la face concave de la calotte de paraboloïde 15 porte trois nervures diamétrales 20 formant entre elles un angle au centre de 60° environ. Ces nervures 20 sont issues de la forme du moule et ont pour but d'apporter un renforcement mécanique de l'antenne 10.In the case of the alternative embodiment illustrated in FIGS. 7 and 8, the sleeve 16 or 16 ′ intended to receive the support arm of the powered element and which formed an external radial extension of the edge 11 of the body 14 of the antenna 10 made of injected plastic material (see FIG. 3) is now replaced by an opening 16 "of substantially square section located in the peripheral part of the paraboloid cap 15. In addition, provision is made in this case for preferably the concave face of the paraboloid cap 15 carries three diametrical ribs 20 forming between them an angle at the center of about 60 ° These ribs 20 are derived from the shape of the mold and are intended to provide mechanical reinforcement of the antenna 10 .
Comme on peut le voir sur les figures 1 à 3 et 7, de façon avantageuse, l'antenne 10 est munie de plusieurs zones 18 (quatre sur les figures) disposées sensiblement dans la partie centrale de l'antenne et présentant une déformation en retrait par rapport à la face concave de l'antenne. Ces zones 18 sont percées en leur milieu par un orifice et sont destinées à la fixation de l'antenne 10 sur un support.As can be seen in FIGS. 1 to 3 and 7, advantageously, the antenna 10 is provided with several zones 18 (four in the figures) arranged substantially in the central part of the antenna and having a deformation set back relative to the concave face of the antenna. These zones 18 are pierced in the middle by an orifice and are intended for fixing the antenna 10 on a support.
On comprend que ces déformations en forme de cuvette sont facilement réalisables au moment de l'emboutissage de la feuille de matériau déployé. It is understood that these deformations in the form of a bowl are easily achievable at the time of stamping of the sheet of expanded material.

Claims

REVENDICATIONS
1. Antenne (10) comprenant un réflecteur (12) en un matériau conducteur de l'électricité enrobé dans un corps (14) en matière plastique, caractérisée en ce que ledit réflecteur est réalisé dans une feuille de matériau déployé définissant des ouvertures (13) en forme de quadrilatère dont les diagonales sont perpendiculaires entre elles.1. Antenna (10) comprising a reflector (12) made of an electrically conductive material embedded in a body (14) of plastic material, characterized in that said reflector is produced in a sheet of expanded material defining openings (13 ) in the form of a quadrilateral whose diagonals are perpendicular to each other.
2. Antenne (10) selon la revendication 1 , caractérisée en ce que ledit matériau conducteur de l'électricité appartient au groupe comprenant les métaux, leurs oxydes et leurs alliages. 2. Antenna (10) according to claim 1, characterized in that said electrically conductive material belongs to the group comprising metals, their oxides and their alloys.
3. Antenne (10) selon la revendication 1 , caractérisée en ce que ledit matériau conducteur de l'électricité est de l'aluminium ou de l'acier.3. Antenna (10) according to claim 1, characterized in that said electrically conductive material is aluminum or steel.
4. Antenne (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite feuille en matériau conducteur de l'électricité présente une épaisseur située entre 0,25 et 0,40 millimètre. 4. Antenna (10) according to any one of the preceding claims, characterized in that said sheet of electrically conductive material has a thickness between 0.25 and 0.40 millimeter.
5. Antenne (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que lesdites ouvertures (13) présentent une forme de losange.5. Antenna (10) according to any one of the preceding claims, characterized in that said openings (13) have a diamond shape.
6. Antenne (10) selon la revendication 5, caractérisée en ce que lesdites ouvertures (13) comportent une grande diagonale présentant une longueur (D) comprise entre 4,5 et 6 millimètres.6. Antenna (10) according to claim 5, characterized in that said openings (13) have a large diagonal having a length (D) between 4.5 and 6 millimeters.
7. Antenne (10) selon la revendication 5, caractérisée en ce que lesdites ouvertures (13) comportent une petite diagonale présentant une longueur (d) comprise entre 3 et 4 millimètres.7. Antenna (10) according to claim 5, characterized in that said openings (13) have a small diagonal having a length (d) between 3 and 4 millimeters.
8. Antenne (10) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'entre lesdites ouvertures subsiste entre 0,25 et 0,5 millimètre de matière.8. Antenna (10) according to any one of the preceding claims, characterized in that between said openings remains between 0.25 and 0.5 millimeter of material.
9. Antenne (10) selon la revendication 5, caractérisée en ce que lesdites ouvertures comportent une grande diagonale présentant une longueur (D) de 6 millimètres et une petite diagonale présentant une longueur (d) de 3,4 millimètres, et en ce qu'entre lesdites ouvertures subsiste 0,3 millimètre de matière. 9. Antenna (10) according to claim 5, characterized in that said openings comprise a large diagonal having a length (D) of 6 millimeters and a small diagonal having a length (d) of 3.4 millimeters, and in that 'between said openings remains 0.3 millimeter of material.
10. Antenne (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite matière plastique est thermoplastique et susceptible d'être injectée.10. Antenna (10) according to any one of the preceding claims, characterized in that said plastic material is thermoplastic and capable of being injected.
11. Antenne (10) selon la revendication 10, caractérisée en ce que ladite matière plastique appartient au groupe comprenant le polyéthylène, le polypropylëne, les polyoléfines, les ABS (terpolymère d'acronitrile, de butadiène et de styrène), les polycarbonates et le poly(méthacrylate de méthyle).11. Antenna (10) according to claim 10, characterized in that said plastic material belongs to the group comprising polyethylene, polypropylene, polyolefins, ABS (terpolymer of acrylonitrile, butadiene and styrene), polycarbonates and poly (methyl methacrylate).
12. Antenne (10) selon la revendication 10, caractérisée en ce que ladite matière plastique est transparente.12. Antenna (10) according to claim 10, characterized in that said plastic material is transparent.
13. Antenne (10) selon la revendication 12, caractérisée en ce que ladite matière plastique est du poly(méthacrylate de méthyle), en particulier du « Plexiglass » (marque déposée).13. Antenna (10) according to claim 12, characterized in that said plastic material is poly (methyl methacrylate), in particular "Plexiglass" (registered trademark).
14. Antenne (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit corps (12) est formé d'une seule pièce munie d'une ouverture (16 ; 16' ; 16") destinée à recevoir le bras de support de l'élément alimenté, lequel est relié directement à l'émetteur ou au récepteur associé à l'antenne (10).14. Antenna (10) according to any one of the preceding claims, characterized in that said body (12) is formed in one piece provided with an opening (16; 16 '; 16 ") intended to receive the arm for supporting the powered element, which is directly connected to the transmitter or receiver associated with the antenna (10).
15. Procédé de fabrication d'une antenne (10), caractérisé en ce qu'il comporte les étapes suivantes : a) on fournit une feuille de métal, b) on réalise des fentes en quinconce dans ladite feuille de métal et on étire ladite feuille pour créer une feuille de métal déployé, c) on réalise un emboutissage sous presse de ladite feuille de métal déployé afin de la découper et de lui donner le volume souhaité de façon à obtenir un déflecteur (12), d) on positionne ledit déflecteur dans le moule d'injection, e) on injecte de la matière thermoplastique dans ledit moule de façon à enrober ledit déflecteur dans un corps (14), et f) on démoule ladite antenne (10). 15. A method of manufacturing an antenna (10), characterized in that it comprises the following steps: a) a metal sheet is provided, b) staggered slots are made in said metal sheet and said stretch is stretched sheet to create a sheet of expanded metal, c) the said sheet of expanded metal is stamped under a press in order to cut it and give it the desired volume so as to obtain a deflector (12), d) position said deflector in the injection mold, e) thermoplastic material is injected into said mold so as to coat said deflector in a body (14), and f) said antenna (10) is removed from the mold.
EP01929735A 2000-04-28 2001-04-27 Parabolic antenna and method for making same Expired - Lifetime EP1279204B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0005537A FR2808382B1 (en) 2000-04-28 2000-04-28 PARABOLIC ANTENNA AND MANUFACTURING METHOD THEREOF
FR0005537 2000-04-28
PCT/FR2001/001302 WO2001084671A1 (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same

Publications (2)

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EP1279204A1 true EP1279204A1 (en) 2003-01-29
EP1279204B1 EP1279204B1 (en) 2004-07-14

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Application Number Title Priority Date Filing Date
EP01929735A Expired - Lifetime EP1279204B1 (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same

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EP (1) EP1279204B1 (en)
AT (1) ATE271264T1 (en)
AU (1) AU2001256430A1 (en)
DE (1) DE60104302T2 (en)
ES (1) ES2223835T3 (en)
FR (1) FR2808382B1 (en)
PT (1) PT1279204E (en)
WO (1) WO2001084671A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000024086A1 (en) 1998-10-16 2000-04-27 Societe De Transformation Industrielle De Matieres Plastiques - Stimap Electromagnetic wave reflector and method for making same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2447565C3 (en) * 1974-10-05 1978-07-20 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Fine metal mesh structure with arched lattice bars
US4678699A (en) * 1982-10-25 1987-07-07 Allied Corporation Stampable polymeric composite containing an EMI/RFI shielding layer
JPS60170303A (en) * 1984-02-14 1985-09-03 Mitsubishi Plastics Ind Ltd Parabolic reflector
DE9001255U1 (en) * 1990-02-03 1990-04-05 Hagenbusch, Günther, 7313 Reichenbach Satellite reception antenna
IT1255930B (en) * 1992-10-28 1995-11-17 REFLECTIVE PARABOLIC ANTENNA FOR THE RECEPTION OF ELECTROMAGNETIC WAVES AND RELATED PRODUCTION METHOD.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000024086A1 (en) 1998-10-16 2000-04-27 Societe De Transformation Industrielle De Matieres Plastiques - Stimap Electromagnetic wave reflector and method for making same

Also Published As

Publication number Publication date
AU2001256430A1 (en) 2001-11-12
ES2223835T3 (en) 2005-03-01
WO2001084671A1 (en) 2001-11-08
FR2808382A1 (en) 2001-11-02
DE60104302D1 (en) 2004-08-19
ATE271264T1 (en) 2004-07-15
FR2808382B1 (en) 2003-07-25
PT1279204E (en) 2004-11-30
EP1279204B1 (en) 2004-07-14
DE60104302T2 (en) 2005-06-09

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