FR2616102A3 - Method of manufacturing a parabolic antenna and antenna obtained by this method - Google Patents
Method of manufacturing a parabolic antenna and antenna obtained by this method Download PDFInfo
- Publication number
- FR2616102A3 FR2616102A3 FR8708303A FR8708303A FR2616102A3 FR 2616102 A3 FR2616102 A3 FR 2616102A3 FR 8708303 A FR8708303 A FR 8708303A FR 8708303 A FR8708303 A FR 8708303A FR 2616102 A3 FR2616102 A3 FR 2616102A3
- Authority
- FR
- France
- Prior art keywords
- antenna
- parabolic
- deformation
- coated
- composite plate
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000002131 composite material Substances 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 8
- 239000012815 thermoplastic material Substances 0.000 claims abstract description 6
- 230000005855 radiation Effects 0.000 claims description 9
- 230000002745 absorbent Effects 0.000 claims description 3
- 239000002250 absorbent Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000005034 decoration Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000010408 film Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 238000002592 echocardiography Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3456—Antennas, e.g. radomes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/416—Reflective
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
PROCEDE DE FABRICATION D'UNE ANTENNE
PARABOLIQUE ET ANTENNE OBTENUE
PAR CE PROCEDE
La présente invention se rapporte à un procédé de fabrication d'une antenne parabolique destinée à la réception et/ou à l'émission d'ondes radio-électriques, ainsi qu'à une antenne obtenue par ce procédé.METHOD FOR MANUFACTURING AN ANTENNA
PARABOLIC AND ANTENNA OBTAINED
BY THIS PROCESS
The present invention relates to a method of manufacturing a parabolic antenna intended for receiving and / or transmitting radio waves, as well as to an antenna obtained by this method.
La plupart des antennes paraboliques connues actuellement ont leur face réfléchissante parabolique réalisée par emboutissage ou par repoussage d'une plaque métallique plus ou moins épaisse. Ces techniques de fabrication ont pour inconvénient d'engendrer des déformations de surface qui, même minimes, nuisent à la qualité de réflexion des ondes. Most parabolic antennas currently known have their parabolic reflecting face produced by stamping or by pushing back a more or less thick metal plate. These manufacturing techniques have the drawback of causing surface deformations which, even minimal, adversely affect the quality of reflection of the waves.
Le procédé selon l'invention vise à remédier à cet Inconvénient. Il consiste à réaliser la partie parabolique réfléchissante de l'antenne par déformation, à chaud et en une seule fois, d'une plaque composite plane comportant au moins un substrat en matière thermoplastique recouvert d'une pellicule métallique réfléchissante. Avantageusement, cette pellicule métallique est elle-même recouverte d'un film protecteur perméable aux ondes radio-électriques. The method according to the invention aims to remedy this drawback. It consists in producing the reflective parabolic part of the antenna by deformation, hot and all at once, of a flat composite plate comprising at least one substrate of thermoplastic material covered with a reflective metallic film. Advantageously, this metal film is itself covered with a protective film permeable to radio waves.
L'invention se rapporte aussi à une antenne parabolique obtenue par ce procédé, cette antenne se caractérisant par le fait que sa partie parabolique réfléchissante est constituée par un complexe comportant au moins un substrat en matière thermoplastique recouvert d'une pellicule métallique sur au moins sa face réfléchissante. The invention also relates to a parabolic antenna obtained by this method, this antenna being characterized by the fact that its reflective parabolic part consists of a complex comprising at least one substrate of thermoplastic material covered with a metallic film on at least its reflective face.
L'invention sera bien comprise, et ses avantages et autres caractéristiques ressortiront, au cours de la description suivante de deux exemples non limitatifs de réalisation, en référence aux dessins schématiques annexés dans lesquels
Figure 1 est une vue d'ensemble en perspective d'une antenne parabolique simple réalisée par ce procédé
Figure 2 est une vue en coupe partielle de cette antenne, selon Il-Il de la figure 1 ;
Figure 3 est une vue en coupe partielle de la plaque composite, avant déformation, ayant servi à la réalisation de cette antenne
Figure 4 est une vue en coupe, selon IV-IV de la figure 5, d'une antenne parabolique multiple réalisée par ce même procédé ; et
Figure 5 est une vue de face de l'antenne multiple de la figure 4.The invention will be clearly understood, and its advantages and other characteristics will emerge during the following description of two nonlimiting exemplary embodiments, with reference to the appended schematic drawings in which
Figure 1 is an overall perspective view of a simple satellite dish produced by this method
Figure 2 is a partial sectional view of this antenna, according to Il-Il of Figure 1;
Figure 3 is a partial sectional view of the composite plate, before deformation, having been used for the production of this antenna
Figure 4 is a sectional view, along IV-IV of Figure 5, of a multiple satellite dish produced by this same process; and
Figure 5 is a front view of the multiple antenna of Figure 4.
La figure 1 représente une antenne parabolique de réception et/ou d'émission d'ondes hertziennes obtenue par ce procédé. Elle comporte une partie parabolique réfléchissante 1, au foyer de laquelle est placé le capteur 2 porté par trois tiges métalliques 3 ou, en variante, par au moins un bras 4 en matière plastique perméable aux ondes hertziennes (méthacrylate par exemple), ce qui élimine les échos et réflexions parasites dues à ces tiges 3. FIG. 1 represents a parabolic antenna for receiving and / or transmitting radio waves obtained by this method. It comprises a reflective parabolic part 1, at the focus of which is placed the sensor 2 carried by three metal rods 3 or, as a variant, by at least one arm 4 made of plastic material permeable to radio waves (methacrylate for example), which eliminates parasitic echoes and reflections due to these rods 3.
La partie réfléchissante 1 est portée par une double coque 5, elle-même fixée sur un pied 6. The reflecting part 1 is carried by a double shell 5, itself fixed on a foot 6.
La structure de la partie réfléchissante 1 et de la double coque 5 est visible plus en détails sur la figure 2, et le procédé de fabrication de cette structure sera expliqué à l'aide, également, de la figure 3. The structure of the reflecting part 1 and of the double shell 5 is visible in more detail in FIG. 2, and the method of manufacturing this structure will be explained with the help, also, of FIG. 3.
Pour réaliser, de la même façon, la partie réfléchissante 1 d'une part et la double coque 5 d'autre part, on part d'une feuille ou plaque composite 7 (figure 3) qui se compose d'un substrat 8 en matière plastique thermoformable éventuellement chargée d'une poudre métallique, sur lequel est rapportée une fine pellicule 9 de métal réfléchissant, sur laquelle est en outre rapportée un film protecteur 10, en polycarbonate par exemple, perméable aux ondes hertziennes. To produce, in the same way, the reflective part 1 on the one hand and the double shell 5 on the other hand, we start from a composite sheet or plate 7 (FIG. 3) which consists of a substrate 8 made of material. thermoformable plastic possibly charged with a metallic powder, to which a thin film 9 of reflective metal is added, to which is also added a protective film 10, made of polycarbonate for example, permeable to radio waves.
La couche métallique 9, dont l'épaisseur est par exemple d'une quinzaine de microns, peut par exemple être obtenue par dépôt électrolytique, ou par sérigraphie avec une encre métallique, ou par métallisation sous vide, ou encore par simple plaxage ou plaquage par explosion d'un film aluminium. The metal layer 9, the thickness of which is for example about fifteen microns, can for example be obtained by electrolytic deposition, or by screen printing with a metallic ink, or by vacuum metallization, or even by simple plaxing or plating by explosion of aluminum film.
Sur la couche protectrice 10, en des endroits choisis de celle-ci, peut avantageusement être rapporté, par sérigraphie par exemple et tant que le complexe 7 est plan, soit une couche absorbante pour le rayonnement infrarouge, mais transparente au rayonnement hertzien, soit un décor, éventuellement publicitaire, en mono ou polychromie, perméable au rayon- nement hertzien, soit, dans la zone prévue pour être extérieure à la zone réfléchissante, une couche absorbante au rayonnement hertzien, soit une combinaison choisie de tout ou partie de ces couches. On the protective layer 10, in selected locations thereof, can advantageously be added, by screen printing for example and as long as the complex 7 is planar, either an absorbent layer for infrared radiation, but transparent to radio radiation, or a decoration, possibly advertising, in mono or polychromy, permeable to radio radiation, either, in the zone intended to be outside the reflecting zone, an absorbent layer with radio radiation, or a chosen combination of all or part of these layers.
Le complexe 7, après avoir été découpé aux dimensions voulues, est ensuite déformé à chaud en une seule fois, à l'aide d'un moule de forme lisse du type polymiroir, jusqu'à obtenir d'une part la partie ~1 en une première opération de formage, et d'autre part la coque 5 en une autre opération de formage. Comme visible sur la figure 2, la coque 5 est réalisée de façon que sa pellicule métallique 11 soit orientée vers l'extérieur. The complex 7, after having been cut to the desired dimensions, is then hot deformed in one go, using a mold of smooth shape of the polymiroir type, until on the one hand obtaining the part ~ 1 in a first forming operation, and on the other hand the shell 5 in another forming operation. As shown in Figure 2, the shell 5 is made so that its metal film 11 is oriented outward.
Les deux parties 1 et 5 sont ensuite collées l'une à l'autre en l2 et 13, de manière relativement étanche. Elles délimitent alors entre elles un espace clos 26 dans lequel est avantageusement installé, après découpage d'une trappe de visite, le bloc électronique et mécanique, ainsi qu'au moins une résistance chauffante utilisée -avantageusement en hiver pour éliminer la neige et/ou la glace susceptibles de se déposer sur la face réfléchissante 1. The two parts 1 and 5 are then bonded to each other at 12 and 13, in a relatively sealed manner. They then delimit between them an enclosed space 26 in which is advantageously installed, after cutting out an inspection hatch, the electronic and mechanical unit, as well as at least one heating resistor used-advantageously in winter to remove snow and / or the glass likely to be deposited on the reflecting face 1.
On obtient, par un effet de caissonage, une bonne rigidité au moyen de feuilles composites 7 relativement peu épaisses.Is obtained, by a boxing effect, good rigidity by means of composite sheets 7 relatively thin.
La figure 2 montre que la partie 1 est avantageusement conformée pour présenter une couronne annulaire périphérique 14, d'une profondeur p de l'ordre d'une dizaine de millimètres pour un diamètre de l'ordre de 60 à 80 centimètres par exemple. Cette couronne 14 s'oppose à l'arrivée de certaines ondes et échos perturbants, ce qui améliore le rendement de l'antenne. FIG. 2 shows that the part 1 is advantageously shaped to present a peripheral annular ring 14, with a depth p of the order of ten millimeters for a diameter of the order of 60 to 80 centimeters for example. This ring 14 opposes the arrival of certain disturbing waves and echoes, which improves the efficiency of the antenna.
La partie plane supérieure 15 de la couronne 14, ainsi que la face annulaire extérieure 16 de cette couronne, sont revêtues de la couche absorbante aux ohdes hertziennes précitées, ce qui arrête encore mieux les ondes et échos parasites et évite les réflexions vers d'autres antennes. The upper flat part 15 of the crown 14, as well as the outer annular face 16 of this crown, are coated with the abovementioned layer of microwave ohms absorption, which stops the parasitic waves and echoes even better and prevents reflections towards other antennas.
Le procédé de fabrication qui vient d'être décrit permet la réalisation aisée d'une antenne monobloc multiple, telle que l'antenne représentée aux figures 4 et 5. Cette antenne monobloc comporte, sur une partie réfléchissante d'un seul tenant 17, quatre surfaces paraboliques réfléchissantes 18 à 21, auxquelles sont associés quatre capteurs 22 à 25. Une telle antenne est par exemple utilisable pour une réception d'image en relief ou pour une synthèse de couleurs. The manufacturing process which has just been described allows the easy production of a multiple monoblock antenna, such as the antenna shown in FIGS. 4 and 5. This monoblock antenna comprises, on a reflecting part in one piece 17, four reflective parabolic surfaces 18 to 21, with which four sensors 22 to 25 are associated. Such an antenna is for example usable for receiving an image in relief or for a synthesis of colors.
L'invention n'est bien entendu pas limitée aux exemples de réalisation qui viennent d'être décrits. Il est également possible de réaliser cette antenne sans la double coque 5. Dans ce cas, on observe un meilleur rendement en utilisant un- substrat 8 chargé de poudre métallique, ou en réalisant l'antenne à partir d'un complexe 7 qui est métallisé sur ses deux faces. The invention is of course not limited to the embodiments which have just been described. It is also possible to make this antenna without the double shell 5. In this case, better performance is observed by using a substrate 8 loaded with metallic powder, or by making the antenna from a complex 7 which is metallized. on both sides.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8708303A FR2616102A3 (en) | 1987-06-05 | 1987-06-05 | Method of manufacturing a parabolic antenna and antenna obtained by this method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8708303A FR2616102A3 (en) | 1987-06-05 | 1987-06-05 | Method of manufacturing a parabolic antenna and antenna obtained by this method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2616102A3 true FR2616102A3 (en) | 1988-12-09 |
Family
ID=9352037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8708303A Pending FR2616102A3 (en) | 1987-06-05 | 1987-06-05 | Method of manufacturing a parabolic antenna and antenna obtained by this method |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2616102A3 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3897294A (en) * | 1974-05-06 | 1975-07-29 | Gen Dynamics Corp | Method of forming a parabolic antenna |
| NL7603245A (en) * | 1976-03-29 | 1977-10-03 | Philips Nv | METHOD FOR THE MANUFACTURE OF A METALIZED PLASTIC REFLECTOR. |
| EP0079062A1 (en) * | 1981-11-05 | 1983-05-18 | Pico-Savac, Inc. | Reflector and method for making the same |
| EP0114797A2 (en) * | 1983-01-20 | 1984-08-01 | Stig Olof Andersson | Micro wave antenna |
-
1987
- 1987-06-05 FR FR8708303A patent/FR2616102A3/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3897294A (en) * | 1974-05-06 | 1975-07-29 | Gen Dynamics Corp | Method of forming a parabolic antenna |
| NL7603245A (en) * | 1976-03-29 | 1977-10-03 | Philips Nv | METHOD FOR THE MANUFACTURE OF A METALIZED PLASTIC REFLECTOR. |
| EP0079062A1 (en) * | 1981-11-05 | 1983-05-18 | Pico-Savac, Inc. | Reflector and method for making the same |
| EP0114797A2 (en) * | 1983-01-20 | 1984-08-01 | Stig Olof Andersson | Micro wave antenna |
Non-Patent Citations (1)
| Title |
|---|
| MODERN PLASTICS INTERNATIONAL, vol. 10, no. 5, mai 1980, pages 32,33, Lausanne, CH; "Thermoformability leads parade of transfer-foil advances" * |
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