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)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8849763

Family Applications (1)

Country Status (8)

Citations (5)

Family Cites Families (1)

• 2000
  • 2000-04-28 FR FR0005537A patent/FR2808382B1/fr not_active Expired - Fee Related
• 2001
  • 2001-04-27 ES ES01929735T patent/ES2223835T3/es not_active Expired - Lifetime
  • 2001-04-27 DE DE60104302T patent/DE60104302T2/de not_active Expired - Fee Related
  • 2001-04-27 AU AU2001256430A patent/AU2001256430A1/en not_active Abandoned
  • 2001-04-27 EP EP01929735A patent/EP1279204B1/de not_active Expired - Lifetime
  • 2001-04-27 PT PT01929735T patent/PT1279204E/pt unknown
  • 2001-04-27 AT AT01929735T patent/ATE271264T1/de not_active IP Right Cessation
  • 2001-04-27 WO PCT/FR2001/001302 patent/WO2001084671A1/fr active IP Right Grant

Patent Citations (5)

Non-Patent Citations (1)

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