FR2808382A1 - Parabolic antenna and manufacturing method thereof - Google Patents

Parabolic antenna and manufacturing method thereof Download PDF

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Publication number
FR2808382A1
FR2808382A1 FR0005537A FR0005537A FR2808382A1 FR 2808382 A1 FR2808382 A1 FR 2808382A1 FR 0005537 A FR0005537 A FR 0005537A FR 0005537 A FR0005537 A FR 0005537A FR 2808382 A1 FR2808382 A1 FR 2808382A1
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FR
France
Prior art keywords
antenna
sheet
openings
plastic
electrically conductive
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
FR0005537A
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French (fr)
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FR2808382B1 (en
Inventor
Jean Francois Mazzocchi
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VECTOR IND FRANCE
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VECTOR IND FRANCE
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Filing date
Publication date
Application filed by VECTOR IND FRANCE filed Critical VECTOR IND FRANCE
Priority to FR0005537A priority Critical patent/FR2808382B1/en
Publication of FR2808382A1 publication Critical patent/FR2808382A1/en
Application granted granted Critical
Publication of FR2808382B1 publication Critical patent/FR2808382B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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 present invention relates to an antenna (10) comprising a reflector made of an electrically conductive material embedded in a plastic body. According to the present invention, said reflector is made of a sheet of expanded material defining quadrilateral openings. whose diagonals are perpendicular to each other.

Description

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 antenna for decimetric wavelengths up to millimetric 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 the shape of a cap of a sphere or 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 disadvantages, whether in terms of manufacturing process 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 entraining, for the final product. , poor technical reception characteristics due to 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 produced in a sheet of expanded material defining quadrilateral openings whose diagonals are perpendicular to each other. indeed notes 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 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 the metals, their oxides and their alloys - this electrically conductive material being, preferably, 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 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 the 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 the 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 , - small diagonal of the openings has a length between 3 and 4 mm, and - between the openings remains between 0.25 and 0 5 mm of material constituting strips of the mesh intended to form the reflector. The best reception results for the antenna according to the present invention have been obtained, 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 material remaining between the openings (width of the aforementioned strips).

As the plastic material constituting the antenna body, any thermoplastic plastic material capable of being injected may be used, in particular a plastic material belonging to the group comprising polyethylene, polypropylene, polyolefins, (terpolymers of acrylonitrile, of 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 an almost invisible structure as soon as an observer is located at a certain distance from the antenna.

In order to take advantage of this advantage, the plastic material forming the body of the antenna is advantageously provided to be 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 an expanded metal sheet, c) a press stamping of said expanded metal sheet is read in order to cut it and give it the desired volume so as to obtain a deflector, d) said deflector is positioned in the mold 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 appended 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 11-1I of FIG. 1, - Figure 3 is a sectional view of the antenna, object of the present invention, in the direction 111-11l 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.

In FIG. 1, visible an antenna 10 according to the present invention 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 1 forming a rim turned towards the rear of the antenna as can be seen more clearly in FIGS. 2 and 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 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, 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 intended to receive the support arm of the powered element which is able to be 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 arm length, 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, 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 reference numeral 16 ′, the shape of this sleeve 16 'being that of a pyramid trunk with a rectangular base.

As can be seen in Figures 1 to 3, 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 with respect to 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 (12)

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 deployed 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 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 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 between 3 and 4 millimeters.
8. Antenna (10) according to any preceding claim, characterized in that between said openings remains between 0 0.5 millimeter of material.
9. Antenna (10) according to claim 5, characterized in that said openings comprise a large diagonal having a length of 6 millimeters and a small diagonal having a length (d) of 3.4 millimeters, and in that between said openings remain 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. Antenna (10) according to claim 12, characterized in that said plastic material is poly (methyl methacrylate), in particular Plexiglass (registered trademark). Antenna (10) according to any one of the preceding claims, characterized in that said body (12) is formed in one piece provided with a sleeve (16; 16 ') intended to receive the element's support arms powered, which is connected directly to the transmitter or receiver associated with the Antenna (10). Antenna (10) according to claim 14, characterized in that said sleeve (16; 16 ') is arranged on the edge (11) of the body. 16. Antenna (10) according to claim 14, characterized in that said sleeve (16 ') has the shape of a trunk of a pyramid. 17. A method of manufacturing an antenna (10), characterized in that it comprises the following steps; a) a sheet of metal is provided, b) staggered slots are made in said sheet of metal and the sheet is stretched to create a sheet of expanded metal, c) a stamping of said sheet of expanded metal is carried out in press cutting it and giving it the desired volume so as to obtain a deflector (12), d) positioning said deflector in the injection mold, e) injecting thermoplastic material into said mold so as to coat said deflector in a body (14), and f) demolding said antenna (10).
FR0005537A 2000-04-28 2000-04-28 Parabolic antenna and manufacturing method thereof Expired - Fee Related FR2808382B1 (en)

Priority Applications (1)

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

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
FR0005537A FR2808382B1 (en) 2000-04-28 2000-04-28 Parabolic antenna and manufacturing method thereof
PCT/FR2001/001302 WO2001084671A1 (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same
PT01929735T PT1279204E (en) 2000-04-28 2001-04-27 Parabolic antenna and its manufacturing procedure
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
EP20010929735 EP1279204B1 (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same
AU5643001A AU5643001A (en) 2000-04-28 2001-04-27 Parabolic antenna and method for making same
ES01929735T ES2223835T3 (en) 2000-04-28 2001-04-27 Parabolic antenna and its manufacturing procedure.

Publications (2)

Publication Number Publication Date
FR2808382A1 true FR2808382A1 (en) 2001-11-02
FR2808382B1 FR2808382B1 (en) 2003-07-25

Family

ID=8849763

Family Applications (1)

Application Number Title Priority Date Filing Date
FR0005537A Expired - Fee Related FR2808382B1 (en) 2000-04-28 2000-04-28 Parabolic antenna and manufacturing method thereof

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 (1)

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

Also Published As

Publication number Publication date
WO2001084671A1 (en) 2001-11-08
FR2808382B1 (en) 2003-07-25
AU5643001A (en) 2001-11-12
EP1279204B1 (en) 2004-07-14
DE60104302D1 (en) 2004-08-19
ES2223835T3 (en) 2005-03-01
AT271264T (en) 2004-07-15
EP1279204A1 (en) 2003-01-29
DE60104302T2 (en) 2005-06-09
PT1279204E (en) 2004-11-30

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Effective date: 20081231