WO2001084671A1 - Parabolic antenna and method for making same - Google Patents

Parabolic antenna and method for making same Download PDF

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Publication number
WO2001084671A1
WO2001084671A1 PCT/FR2001/001302 FR0101302W WO0184671A1 WO 2001084671 A1 WO2001084671 A1 WO 2001084671A1 FR 0101302 W FR0101302 W FR 0101302W WO 0184671 A1 WO0184671 A1 WO 0184671A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
sheet
openings
plastic
electrically conductive
Prior art date
Application number
PCT/FR2001/001302
Other languages
French (fr)
Inventor
Jean-François MAZZOCCHI
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
Priority to FR00/05537 priority Critical
Priority to FR0005537A priority patent/FR2808382B1/en
Application filed by Vector Industries France filed Critical Vector Industries France
Publication of WO2001084671A1 publication Critical patent/WO2001084671A1/en

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14Reflecting surfaces; Equivalent structures
    • H01Q15/16Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
    • H01Q15/168Mesh reflectors mounted on a non-collapsible frame
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14Reflecting surfaces; Equivalent structures
    • H01Q15/141Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14Reflecting surfaces; Equivalent structures
    • H01Q15/141Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H01Q15/142Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface

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


  



   Satellite dish and its manufacturing process
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 for the purpose of radiating or picking 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.



   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.



   The present invention aims to overcome these drawbacks.



   To this end, the present invention aims to provide an antenna having good technical reception characteristics, forming a structure resistant to mechanical and atmospheric stresses, 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 deployed material defining openings in the form of a quadrilateral whose diagonals are perpendicular to each other.



   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.



   The present invention also relates to the method of manufacturing such an antenna.



     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.



   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.



   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 slits 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, and -between the openings remain between 0.25 and 0.5 mm of material constituting the strips of the mesh intended to form the reflector.



   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).



   As 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 (acritrile terpolymer, butadiene and styrene), 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).



   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.



   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) 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, 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.



   It is understood that the description and the drawings are given for information only and are not limiting.



     Reference will be made to the accompanying drawings, in which: FIG. 1 is a front elevation view of the antenna according to the present invention, FIG. 2 is a sectional view in the direction tf-t) of FIG. 1, - Figure 3 is a sectional view of the antenna, object of the present invention, in the direction III-III of Figure 1, - Figure 4 is an enlargement of detail IV of Figure 1, and - Figures 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, and FIG. 8 is a partial enlarged view of the antenna in the direction VIII-VIII of Figure 7.



   In FIG. 1, an antenna 10 according to the present invention is visible, having the shape of a paraboloid cap, therefore of circular shape from its front and rear faces. 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 parabotoid cap of 15 which is surrounded by the edge 11 (see FIG. 3).



   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.



   This reflector 12 is therefore formed of a sort of grid, the strips 15, of width 1, coming from an initially full sheet which has been stretched in the direction of the small diagonal after cutting slits 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.



   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 includes 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, 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.



   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 numerical reference 16 ′, the shape of this sleeve 16 ′ being that of a trunk of pyramid with a rectangular base.



   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 t 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 approximately 60. These ribs 20 are derived from the shape of the mold and are intended to provide mechanical reinforcement of the antenna 10.



   As can be seen in Figures 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 in withdrawal 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.



   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

 CLAIMS 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 made of a sheet of expanded material defining openings ( 13) in the form of a quadrilateral whose diagonals are perpendicular to each other.
 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. Antenna (10) according to claim 1, characterized in that said electrically conductive material is aluminum or steel.
 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. Antenna (10) according to any one of the preceding claims, characterized in that said openings (13) have a diamond shape.
 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. 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. 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. 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. Antenna (10) according to any one of the preceding claims, characterized in that said plastic material is thermoplastic and capable of being injected.
   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. Antenna (10) according to claim 10, characterized in that said plastic material is transparent.
 13. Antenna (10) according to claim 12, characterized in that said plastic material is poly (methyl methacrylate), in particular Plexiglass (registered trademark).
 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. 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 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.
PCT/FR2001/001302 2000-04-28 2001-04-27 Parabolic antenna and method for making same WO2001084671A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR00/05537 2000-04-28
FR0005537A FR2808382B1 (en) 2000-04-28 2000-04-28 Parabolic antenna and manufacturing method thereof

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU5643001A AU5643001A (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same
EP20010929735 EP1279204B1 (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same
AT01929735T AT271264T (en) 2000-04-28 2001-04-27 Parabolic antenna and method for the production thereof
DE2001604302 DE60104302T2 (en) 2000-04-28 2001-04-27 Parabolantenne and method for the production thereof

Publications (1)

Publication Number Publication Date
WO2001084671A1 true WO2001084671A1 (en) 2001-11-08

Family

ID=8849763

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2001/001302 WO2001084671A1 (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same

Country Status (8)

Country Link
EP (1) EP1279204B1 (en)
AT (1) AT271264T (en)
AU (1) AU5643001A (en)
DE (1) DE60104302T2 (en)
ES (1) ES2223835T3 (en)
FR (1) FR2808382B1 (en)
PT (1) PT1279204E (en)
WO (1) WO2001084671A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038040A (en) * 1974-10-05 1977-07-26 Messerschmitt-Bolkow-Blohm Gmbh Flexible lattice-like grid structure etched from a metallic foil
JPS60170303A (en) * 1984-02-14 1985-09-03 Mitsubishi Plastics Ind Ltd Parabolic reflector
US4678699A (en) * 1982-10-25 1987-07-07 Allied Corporation Stampable polymeric composite containing an EMI/RFI shielding layer
DE9001255U1 (en) * 1990-02-03 1990-04-05 Hagenbusch, Guenther, 7313 Reichenbach, De
EP0595418A1 (en) * 1992-10-28 1994-05-04 Di. W.S. PLASTIC S.r.l. Reflecting parabolic antenna for e.m. wave reception and related manufacturing method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2784804B1 (en) 1998-10-16 2001-06-29 Transformation Ind De Matieres Antenna with wires coated with a layer of thermoplastic material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038040A (en) * 1974-10-05 1977-07-26 Messerschmitt-Bolkow-Blohm Gmbh Flexible lattice-like grid structure etched from a metallic foil
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, Guenther, 7313 Reichenbach, De
EP0595418A1 (en) * 1992-10-28 1994-05-04 Di. W.S. PLASTIC S.r.l. Reflecting parabolic antenna for e.m. wave reception and related manufacturing method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 010, no. 005 (E - 372) 10 January 1986 (1986-01-10) *
See also references of EP1279204A1 *

Also Published As

Publication number Publication date
PT1279204E (en) 2004-11-30
EP1279204B1 (en) 2004-07-14
FR2808382B1 (en) 2003-07-25
EP1279204A1 (en) 2003-01-29
ES2223835T3 (en) 2005-03-01
AU5643001A (en) 2001-11-12
FR2808382A1 (en) 2001-11-02
DE60104302T2 (en) 2005-06-09
AT271264T (en) 2004-07-15
DE60104302D1 (en) 2004-08-19

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