EP3001504A1 - Verbindungsvorrichtung zum Befestigen eines Elements mit einem flachen Rand auf einer Unterlage - Google Patents

Verbindungsvorrichtung zum Befestigen eines Elements mit einem flachen Rand auf einer Unterlage Download PDF

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Publication number
EP3001504A1
EP3001504A1 EP14306468.1A EP14306468A EP3001504A1 EP 3001504 A1 EP3001504 A1 EP 3001504A1 EP 14306468 A EP14306468 A EP 14306468A EP 3001504 A1 EP3001504 A1 EP 3001504A1
Authority
EP
European Patent Office
Prior art keywords
flange
face
flat
lower half
upper half
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
EP14306468.1A
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English (en)
French (fr)
Other versions
EP3001504B1 (de
Inventor
Armel Lebayon
Loic Isambard
Samuel Siret
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.)
Nokia Shanghai Bell Co Ltd
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
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 Alcatel Lucent Shanghai Bell Co Ltd filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to EP14306468.1A priority Critical patent/EP3001504B1/de
Publication of EP3001504A1 publication Critical patent/EP3001504A1/de
Application granted granted Critical
Publication of EP3001504B1 publication Critical patent/EP3001504B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/12—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces wherein the surfaces are concave

Definitions

  • the present invention relates to an assembly device for fixing a radome on a reflector, intended for use in concave reflector antennas having for example the shape of at least one parabola portion, the reflector being possibly equipped with a skirt.
  • Parabolic reflector antennas are usually used for mobile communication networks.
  • Such an antenna comprises a main reflector having a concavity having for example the shape of a paraboloid of revolution about the axis of symmetry of the antenna, and a feeding device located along the axis of symmetry of the antenna.
  • antenna for transmitting electromagnetic waves transmitted or received by the antenna.
  • the periphery of the parabola is most often provided with a cylindrical wall, also called skirt or screen, which limits the lateral radiation of the antenna and thus improves its performance.
  • a radome is associated with an impervious protective surface which partitions the space defined by the reflector vis-à-vis the outside.
  • This radome can be flexible or relatively rigid.
  • a radome composed of a flexible material such as a fabric has a limited production cost and a small footprint prior to installation on the antenna.
  • such a flexible radome has disadvantages related to a relative fragility and a complex system of attachment to the skirt of the antenna, requiring self-tensing elements for its setting and its maintenance under tension, such as springs.
  • a rigid but flexible radome made of a non-flexible material, the most used today, has the advantage of good resistance to the external climatic environment such as rain, wind or snow. It is therefore essential to ensure a solid attachment capable of withstanding the wind force, particularly for reflectors of large diameter.
  • the fastening system must also allow rapid disassembly / reassembly and without degradation of the radome on the reflector.
  • the rigid radome is most often fixed on the reflector by means of different devices having in common to require a plurality of screws or bolts placed on the periphery of the radome.
  • the number of bolts is high.
  • the presence of such a quantity of metal bolts and the asperities they form on the radome can cause degradation of the radio performance of the antenna.
  • a thermoforming method is usually used in the case of materials capable of withstanding a high temperature and whose thermal expansion coefficient is adapted, to give the rigid radome a lid shape having a folded flange facilitating attachment to the skirt of the reflector .
  • the technical problem which then arises is to find an assembly solution adapted to the fixation of a radome consisting of a rigid material such as a non-thermoformable material, for example a low density material of multilayer type or "nest bee "and having a flat rim on a reflector.
  • a rigid material such as a non-thermoformable material, for example a low density material of multilayer type or "nest bee "and having a flat rim on a reflector.
  • the device assembly must be inexpensive and easy to implement, whether assembly or disassembly.
  • the half-flanges are plastic.
  • the half-flanges are made of a rigid dielectric material which nevertheless has a certain flexibility, such as for example a polymer.
  • Suitable polymers include polycarbonate PC, polypropylene PP, polystyrene PS, PVC polyvinyl chloride, acrylonitrile-butadiene-styrene ABS, etc.
  • the rim is metallic.
  • the rim may be made by folding a sheet of metal, for example aluminum or stainless steel.
  • the rim is circular and its ends are connected by a clamping means.
  • the upper half-flange and the lower half-flange bear protuberances capable of cooperating with a housing formed in the flat flange. During assembly, these protuberances facilitate and improve the positioning accuracy of the half-flanges relative to the flanged element.
  • the second section of the lower half-flange comprises orifices intended to receive means for fixing the lower half-flange on the support.
  • these orifices exist, they are arranged so as to be in vis-à-vis perforations previously made in the support.
  • the invention also relates to an antenna which comprises an assembly device as previously described for fixing a rigid flat radome on a concave reflector.
  • the present solution has the advantage of providing a device for assembling a radome on a light reflector and at low cost with high mechanical and radioelectric performance. It should be noted that the cost of the radome and its installation on the reflector is an important part of the total cost of the antenna. In addition, it can allow assemblies that could not be made using currently known devices.
  • the value of this solution is to avoid drilling many holes in the radome, as well as the corresponding manufacturing process steps and the time required. It also does not require perforations in the metal rim.
  • the solution takes advantage of the density of the material chosen for the radome to achieve a pressure assembly so as to incorporate protruding reliefs, for example in the form of teeth, in this lightweight material, solid and soft. The number of parts to make the assembly is also reduced. The step of shaping the rim replaces the steps of drilling holes, reduces the time and complexity of assembly, and therefore the associated costs.
  • the intensity of the radiation I in dB is given on the ordinate, and on the abscissa the emission / reception angle ⁇ in degrees.
  • a rigid radome is made of a light and solid but non-flexible material, such as a sandwich-type material.
  • the radome is usually made of a flexible dielectric material such as a polymer, fiberglass, etc.
  • Suitable polymers are in particular PC polycarbonate, polypropylene PP, polystyrene PS, PVC polyvinyl chloride acrylonitrile-butadiene-styrene ABS, etc.
  • the figure 1 illustrates a partial perspective view of an example of material 1 used for the realization of the rigid radome of a concave reflector antenna.
  • This material sandwich type, comprises an upper layer 2 consisting of a flat plate of polymeric material, such as polypropylene, and a lower layer 3 consisting of a plate of polymeric material which may be similar or different from that of the upper layer 2.
  • the outer layers 2, 3 must be thin (eg 0.55 mm) and have a very low dielectric constant.
  • the layers 2 and 3 surround an intermediate layer 4, formed of cells 5 of low dielectric constant (eg ⁇ r ⁇ 1).
  • the cells 5 are of substantially conical shape and filled with air.
  • Their walls are made of polymer material, such as polypropylene. Thanks to this material, the radome 1 obtained is light and strong, while maintaining a certain flexibility that prevents it from breaking under a moderate stress.
  • the means used must ensure a solid attachment capable of withstanding the force of the wind, especially for antennas of large diameter.
  • Some materials are not thermoformable, which is particularly the case of the sandwich type material illustrated by the figure 1 . It is therefore not possible to give them a shape that would easily fix the flat radome on the edge of the reflector or skirt.
  • the figure 2 illustrates, in exploded view, an embodiment of an assembly device for allowing the attachment of an element 20 having a flat flange 21 on a support.
  • the assembly device comprises an upper half-flange 22 and a lower half-flange 23.
  • the upper half-flange 22 has a first face 24 facing outwards, and a second face 25 which is intended to be brought into contact with a face 26 of the flat flange 21.
  • the second face 25 comprises reliefs 27, which can have for example the shape of teeth, having a suitable profile and sufficient hardness to be able to penetrate into the material constituting the flat rim 21 without damaging it when sufficient pressure is imposed.
  • the upper half-flange 22 also comprises protuberances 28 of shape adapted to the form of housings 29 formed in the flat flange 21. The protuberances 28 cooperating with the corresponding housing 29 serve as guides to allow precise positioning of the upper half-flange 22 with respect to the element 20.
  • the lower half-flange 23 comprises a first flange 30 comprising a first face 31 facing outwards, and a second face 32 which is intended to be brought into contact with the opposite face 33 of the flat flange 21.
  • the second face 32 comprises reliefs 27 able to penetrate into the material constituting the flat rim 21, similar to those described above.
  • the lower half-flange 23 comprises protuberances 28 of shape adapted to the housing form 29 formed in the flat flange 21, similar to those described above.
  • the lower half-flange 23 also comprises a second flange 33.
  • the second flange 33 forms an angle ⁇ that is non-zero with the first flange 30, which may be for example approximately 90 °, thereby forming L.
  • the second pan 33 must allow the docking of the lower half-flange 23 on the chosen support.
  • Orifices 34 are adapted to receive means, such as screws, bolts or rivets, for fixing the lower half-flange 23 to the support.
  • the upper half-flange 22 and the lower half-flange 23 are brought together so as to sandwich the flat flange 21 of the element 20.
  • the reliefs 27 carried by the upper half-flange 22 and the lower half-flange 23 penetrate into the flexible material constituting the element 20 on either side of the flat flange 21.
  • the material constituting the element 20 must be sufficiently flexible and soft or be composed of thin layers , as in the case of a sandwich type material, to be perforated without the need to exert too much pressure.
  • the protuberances 28 carried by the upper half-flange 22 and the lower half-flange 23 fit into the housings 29 formed in the flat flange 21 in order to ensure the connection between the upper half-flange 22 and the lower half-flange. 23, and to facilitate their positioning relative to the flat flange 21.
  • a protuberance 28 carried by the upper half-flange 22 and another protrusion 28 carried by the lower half-flange 23 respectively insert by the top and bottom in the same housing 29, thus making integral the upper half-flange 22 and the lower half-flange 23 between them and with the flat flange 21.
  • the flat flange 21 is sandwiched between the upper half-flange 22 and the lower half-flange 23, themselves held tight by a rim 40.
  • the rim 40 in the shape of a U comprises a first branch 41 contiguous to the first 24 facing outwardly of the upper half-flange 22, and a second branch 42 contiguous to the first face 31 facing outwardly of the first section 30 of the lower half-flange 23.
  • the rim 40 secures the two half -brides 22 and 23 and makes their assembly more solid. It ensures a tight hold of the two half-flanges 22 and 23.
  • the rim 40 is metallic, which contributes to the strength of the assembly and to the improvement of the radiation pattern.
  • the rim 40 can be shaped by folding a sheet of metal.
  • the half-flanges 22, 23 and the rim 40 may cover a portion of the circumference of the flange 21, or the entire circumference thereof.
  • the two ends of the rim 40 may be connected by a clamping means 50 comprising for example a bolt or a screw 51, as illustrated in FIG. figure 5 .
  • the fixing is obtained by clamping the rim on the radome. This avoids creating multiple holes in the radome.
  • the assembly is obtained by clamping so as to cause the reliefs carried by the half-flanges, such as teeth, to penetrate into the solid but soft material of the radome.
  • the assembly device therefore comprises only three main parts: two half-flanges of plastic material and a metal rim without perforation, obtained for example by folding, to connect the two half-flanges.
  • the figure 6 illustrates the method of fixing the element provided with a flat flange on a support by means of the assembly device described above. This process comprises several steps which are as follows.
  • a face of the flat flange is contiguous to the second face provided with reliefs and protuberances of the upper half-flange.
  • the protuberances are placed opposite the corresponding housing formed in the flat flange.
  • the opposite face of the flat flange is contiguous to the second face provided with reliefs and protuberances of the first section of the lower half-flange.
  • the protuberances are placed opposite the corresponding housing formed in the flat flange.
  • a pressure is exerted simultaneously on the first outwardly facing face of the upper half-flange and on the first outwardly facing face of the first flange of the lower half-flange, so that to make penetrate the reliefs in the material constituting the flat edge.
  • protuberances of the upper half-flange and the lower half-flange penetrate into the corresponding housing formed in the flat flange.
  • a U-shaped rim is disposed around the upper half-flange and the lower half-flange so as to ensure a tight hold of the two half-flanges.
  • the rim may be composed of two distinct parts which are joined and secured around the upper half-flange and the lower half-flange.
  • the rim is made of a thin and malleable metal that allows a slight elastic deformation to fit around the upper half-flange and the lower half-flange. This has resulted in a solid assembly around the flat flange which will allow its attachment to a support. It should be noted that steps 60 to 63 can be performed in the factory.
  • fastening means are inserted into the orifices of the second panel of the lower half-flange in order to fix the element provided with a flat flange on the support. It can include screws, bolts or rivets. Thanks to the precise positioning obtained by means of the protuberances, the orifices of the second part of the lower half-flange are opposite the perforations previously drilled in the support.
  • the figure 7 is a diagram showing an antenna 70 comprising a concave primary reflector 71 , provided with a skirt 72, and a secondary reflector 73.
  • the antenna 70 is powered by a waveguide 74 which may be a hollow metal tube, for example in aluminium.
  • the antenna is covered with a flat rigid radome 75 .
  • the waveguide 74 emits incident radiation towards the secondary reflector 73 which is reflected towards the primary reflector 71. Most of the incident radiation is reflected on the primary reflector 71 and forms the radiation emitted by the antenna 70. direction of a receiver.
  • a portion 76 of the incident radiation reaches the edges of the primary reflector 71 where diffraction 77 occurs , which increases the field at the rear of the primary reflector 71 and contributes to deterioration of the forward / backward ratio of the antenna.
  • the figures 8 and 9 illustrate the radiation diagram of an antenna comprising an assembly device as described above.
  • the line 80 continues to reference represents the standard profile corresponding to the model class 3 ETSI.
  • the figure 8 relates to an antenna comprising an assembly device, all parts of which are made of plastic. It is observed that the side lobes 81 exceed the ETSI standard.
  • the side lobes 82 of an antenna comprising an assembly device whose rim is metallic are very clearly below the reference line 80 of the ETSI standard. This highlights the influence of the metal rim on the radio behavior of the antenna.
  • the radiation pattern illustrated by the figure 8 shows that the phenomenon of diffraction is less in this case. Indeed, the thickness of the parts and the discontinuities between different materials create a diffraction on the edge of the primary reflector of the antenna in the case where only the plastic is used. The presence of the metal rim masks the discontinuities between the plastic parts, and contributes to reducing the level of diffraction on the edge of the reflector.
  • the present invention is not limited to the described embodiments, but it is capable of many variants accessible to those skilled in the art without departing from the spirit of the invention.
  • the number and shape of the reliefs and protuberances can be varied. It may also be modified to adapt to the chosen support shape and position of the second panel of the lower half-flange, and the fastening means on the support (clip, rivet, glue, ).
  • the description of the assembly device has been particularly illustrated in the case of the fixation of a rigid plane radome on a concave antenna reflector, but such a device can also be used for any type of radome equipped with a flat rim and any type of reflector.

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  • Details Of Aerials (AREA)
EP14306468.1A 2014-09-24 2014-09-24 Verbindungsvorrichtung zum Befestigen eines Elements mit einem flachen Rand auf einer Unterlage Active EP3001504B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14306468.1A EP3001504B1 (de) 2014-09-24 2014-09-24 Verbindungsvorrichtung zum Befestigen eines Elements mit einem flachen Rand auf einer Unterlage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14306468.1A EP3001504B1 (de) 2014-09-24 2014-09-24 Verbindungsvorrichtung zum Befestigen eines Elements mit einem flachen Rand auf einer Unterlage

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EP3001504A1 true EP3001504A1 (de) 2016-03-30
EP3001504B1 EP3001504B1 (de) 2019-09-11

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109755756A (zh) * 2017-11-02 2019-05-14 启碁科技股份有限公司 无线通信装置及其天线

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914448A (en) * 1987-11-30 1990-04-03 Sony Corporation Microwave antenna structure
EP1762860A1 (de) * 2005-09-09 2007-03-14 Hella KG Hueck & Co. Radareinrichtung für ein Kraftfahrzeug und Verfahren zur Herstellung einer Radareinrichtung
US20090295677A1 (en) * 2008-05-27 2009-12-03 Dish Network L.L.C. Securing ring and assemblies
US20130082896A1 (en) * 2011-09-29 2013-04-04 Andrew Llc Folded Tab Retention Twin Wall Radome and Method of Manufacture
EP2712019A1 (de) * 2012-09-24 2014-03-26 Alcatel- Lucent Shanghai Bell Co., Ltd Vorrichtung zum Befestigen einer Antennenkuppel auf einem Parabolreflektor einer Antenne
EP2772985A1 (de) * 2013-02-27 2014-09-03 Alcatel- Lucent Shanghai Bell Co., Ltd System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914448A (en) * 1987-11-30 1990-04-03 Sony Corporation Microwave antenna structure
EP1762860A1 (de) * 2005-09-09 2007-03-14 Hella KG Hueck & Co. Radareinrichtung für ein Kraftfahrzeug und Verfahren zur Herstellung einer Radareinrichtung
US20090295677A1 (en) * 2008-05-27 2009-12-03 Dish Network L.L.C. Securing ring and assemblies
US20130082896A1 (en) * 2011-09-29 2013-04-04 Andrew Llc Folded Tab Retention Twin Wall Radome and Method of Manufacture
EP2712019A1 (de) * 2012-09-24 2014-03-26 Alcatel- Lucent Shanghai Bell Co., Ltd Vorrichtung zum Befestigen einer Antennenkuppel auf einem Parabolreflektor einer Antenne
EP2772985A1 (de) * 2013-02-27 2014-09-03 Alcatel- Lucent Shanghai Bell Co., Ltd System zum Befestigen einer flachen Antennenkuppel auf einem Konkavreflektor einer Antenne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109755756A (zh) * 2017-11-02 2019-05-14 启碁科技股份有限公司 无线通信装置及其天线

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Publication number Publication date
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