EP1796209B1 - Antenne de radiocommunication munie d'un radôme et procédé d'assemblage d'une telle antenne de radiocommunication munie d'un radôme - Google Patents

Antenne de radiocommunication munie d'un radôme et procédé d'assemblage d'une telle antenne de radiocommunication munie d'un radôme Download PDF

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Publication number
EP1796209B1
EP1796209B1 EP06124765A EP06124765A EP1796209B1 EP 1796209 B1 EP1796209 B1 EP 1796209B1 EP 06124765 A EP06124765 A EP 06124765A EP 06124765 A EP06124765 A EP 06124765A EP 1796209 B1 EP1796209 B1 EP 1796209B1
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EP
European Patent Office
Prior art keywords
antenna
protective surface
radome
reflector
rod
Prior art date
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Application number
EP06124765A
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German (de)
English (en)
French (fr)
Other versions
EP1796209A1 (fr
Inventor
Michel Devicque
François Golias
Yves Gourhand
Pascal Pichon
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.)
Alcatel Lucent SAS
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Alcatel Lucent SAS
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Publication of EP1796209A1 publication Critical patent/EP1796209A1/fr
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    • 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
    • H01Q1/427—Flexible radomes
    • 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
    • H01Q1/421—Means for correcting aberrations introduced by a radome

Definitions

  • the present invention relates to a radiocommunication antenna provided with a radome and a method of assembling such a radiocommunication antenna provided with a radome.
  • An antenna 10 ( figure 1a ) may comprise a main reflector 12 having a concavity having, for example, the shape of a paraboloid of revolution about an axis 14 of symmetry of this antenna 10 and a power supply device 16 transmitting the electromagnetic waves emitted or received by the antenna 10.
  • Such an antenna 10 To improve the performance of such an antenna 10, it is known to provide the latter with a cylindrical wall 17, hereinafter referred to as screen 17. Such a screen 17 limits the lateral radiation of the antenna 10 and improves its performance.
  • the presence of the screen 17 increases the wind gain of the antenna 10 and the risk of accumulation of elements such as water, dust or snow in this antenna 10. Also, it is known to arrange on the screen 17 a radome 18 which has a flat protective surface 19 partitioning the space defined by the reflector 12 and the screen 17 vis-à-vis elements external to the antenna.
  • the radome 18 is composed of a flexible material, for example canvas, which has the advantage of requiring a limited production cost, to have a small footprint during its conditioning prior to installation on the antenna - the radome can be totally or partially folded prior to use - and be sufficiently transparent to the waves transmitted by the antenna over a bandwidth covering different radio applications so that the same fabric can be used to make different radomes for different antennas.
  • the presence of the protective surface 19 of the radome 18 facing the reflector 12 can reduce the performance of the antenna 10. For example, considering that the antenna 10 is emitting, it appears that the waves reflected by the protective surface 19 disturb the operation of the antenna 10, these reflected waves, being represented by arrows on the Figures 1a, 1b and 1c
  • a phase shift is introduced between the reflected waves so that the disturbances generated by these reflected waves can not be added to each other and the average noise caused by these reflected waves is lowered relative to an untwisted antenna.
  • an inclined flexible radome 18 s has an asymmetry vis-à-vis the axis 14 of the antenna. It is then necessary to take into account a specific orientation of the radome 18, flexible during its assembly on the screen 17 as well as during the assembly of this screen 17, provided with the radome 18, on the antenna, this specific orientation may cause assembly errors.
  • rigid radomes such as the rigid radome 18, the figure 1c have been developed, this rigid radome 18, having a protective surface 19 symmetrical with respect to the axis 14 of the antenna.
  • such a rigid radome 18 can be arranged on a screen without considering the problem of an orientation of the radome with respect to the axis of the antenna.
  • these rigid radomes have a high resistance vis-à-vis external elements such as rain, wind or snow.
  • a rigid radome is high compared to a flexible radome generally consisting of a light material that can be folded or stacked.
  • manufacture, packaging and storage of rigid radomes, prior to assembly on an antenna are complex and expensive.
  • the determination of the thickness of the material used in a rigid radome is also problematic since this thickness is determined according to the frequency band used by the antenna.
  • the thickness of a rigid radome implemented in an antenna transmitting with a wavelength of the order of 40Ghz is practically twice as great as the thickness of a rigid radome of the same kind set in motion. operates in a transmitting antenna with a wavelength of the order of 20 GHZ.
  • the present invention aims to remedy at least one of the disadvantages mentioned above. It relates to a radiocommunication antenna comprising a reflector arranged at a first opening of a cylindrical side screen, a radome formed by a flexible material covering a second opening of this lateral screen so as to have a protective surface opposite the reflector, characterized in that the protective surface is curved by the mechanical action of a deforming element of the antenna coming into contact with this protective surface.
  • Such an antenna provided with a flexible radome, can combine advantages specific to the use of a flexible radome or a rigid radome without presenting various disadvantages.
  • an antenna according to the invention has advantages specific to the use of a flexible radome, namely a limited space requirement of the radome prior to its use - the flexible radome can be folded - and the compatibility of the same radome with antennas operating in different wavelength bands, which reduces the number of radomes to be referenced in a production line assembling such antennas.
  • An antenna according to the invention has a reduced cost, given the generally lower cost of a flexible material relative to a rigid material.
  • an antenna according to the invention can implement a flexible radome in the absence of means for maintaining its protective surface under tension, which limits the number of parts used in the antenna and, consequently, the cost of this, antenna.
  • an antenna according to the invention has a curved protective surface, that is to say non-planar, which decreases the wind angle of the antenna, in accordance with one of the advantages of rigid radomes.
  • the protective surface is curved symmetrically with respect to an axis of symmetry of the reflector.
  • the flexible radome has an advantage of a rigid radome thanks to its axis of symmetry which facilitates the assembly of the antenna by eliminating the need to take into account the asymmetry specific to the flexible radome of a tilted antenna .
  • the mechanical action is exerted by at least one of the following elements: a rod, a stay or a spring.
  • the deforming element comprises a deformable rod fixed by its two ends inside the cylindrical side screen, the length of the rod being greater than the diameter of the cylinder so as to maintain this curved rod.
  • the deforming element curves the protective surface by a traction force on at least one anchoring point of the protective surface. This embodiment makes it possible to obtain a radome curved towards the reflector.
  • the deforming element curves the protective surface by an action of pressure on at least one point of support of the protective surface, thereby obtaining a radome curved outwardly of the antenna.
  • the deforming element comprises an attachment to a device for feeding the antenna, this deposition reducing the arrangements necessary for the implementation of the deforming element.
  • the deforming element comprises at least one arm, one end of which is fixed to a waveguide and the other end comes into contact with the protective surface, the arm extending collinearly with an axis of symmetry. reflector so as to limit the disturbance caused by the deformer element.
  • the protective surface comprises rigid parts, which gives the radome a greater resistance while allowing its deformation with its (or its) part (s) flexible (s).
  • the invention also relates to a method of assembling a radiocommunication antenna comprising a reflector arranged at a first opening of a cylindrical side screen, a radome formed by a flexible material covering a second opening of this side screen so as to to have a protective surface vis-à-vis the reflector, characterized in that it comprises the step of assembling the antenna so that the protective surface is curved by the mechanical action of a deforming element of the antenna coming into contact with this protective surface.
  • Such a method can be carried out quickly and easily considering the flexibility of the radome and its ease of storage.
  • the method further comprises the step of symmetrically bending the protective surface with respect to an axis of symmetry of the reflector, which simplifies the assembly operation which must not take into account a specific orientation of the radome.
  • the method further comprises the step of selecting the deforming element from one of the following elements: a rod, a stay or a spring, these elements being simple to implement and low costs.
  • the method further comprises the step of securing a deformable rod within the side shield, the length of the rod being greater or the diameter of the screen so as to keep the rod curved.
  • FIGS. 2a, 2b, 2c, 2d and 2e described below, elements of the same nature are identified by the same reference.
  • an antenna 20 that is to say provided with a reflector 22, a side screen 27 arranged to this reflector 22 and a radome 28 partitioning the space included between the reflector 22 and the side shield 27 by means of a protective surface 29 extending opposite the reflector 22.
  • the reflector 22 is arranged at a first opening of the cylindrical side screen 27 while the radome 28 covers the second opening of this side screen 27, the openings of the radome being formed in these embodiments by the circular bases of the cylinder formed by the screen.
  • the protective surface 29 comprises a flexible material and this surface 29 is kept curved with the aid of a deforming element exerting an action on this protective surface, this deforming element varying according to the embodiments of the invention. described below.
  • the deforming element is composed of two 21- h stays which are fixed at one end to the lateral screen 27 and, at their second end, to a hooking point, such as a ring 23, of the radome 28.
  • the stays can be stretched so as to exert a mechanical action on the ring 23 and consequently on the radome 28 whose protective surface 29 is more or less curved depending on the tension exerted by stays 21 h .
  • This embodiment can have many variants by replacing the shrouds 21 h with rods or springs, and by varying the position and the number of these deforming elements that can be rigid or semi-rigid.
  • shrouds 21 h are replaced by rigid elements of such length that they bend the protective surface 29 towards the outside of the antenna 20 by exerting pressure on the latter with the aid of dots support,
  • the protective surface 29 of the radome may be entirely composed of a flexible material, that is to say capable of deforming, or also comprise rigid parts associated with the flexible parts, the resulting radome nevertheless being flexible as shown on the figure 3 .
  • FIG 3 which represents the protective surface of a radome 28 according to the invention seen from the front, are represented rigid parts 32 of the radome associated with a flexible part 30 of this same radome, this combination of rigid parts 32 with a flexible portion 30 generating a flexible radome 28, that is to say deformable, having increased strength compared to a fully flexible radome.
  • FIG. figure 2b A second antenna embodiment according to the invention is illustrated in FIG. figure 2b .
  • the protective surface 29 of the radome 28 is deformed by means of a rod 21, housed in the cavity formed by the reflector 22, the screen 27 and the protective surface 29.
  • the rod 21 is placed perpendicularly to the axis 24 of the antenna 20 by being housed in diametrically opposite cavities of the screen 27.
  • the length of the rod 21 is greater than or greater than the diameter of the rod. screen so that this rod is kept curved in this cavity.
  • the rod is kept folded by the strong mechanical compressive stress that it undergoes.
  • the 25th ends ( figure 4 ) of the rod 21, can be housed in cavities 27c forcing the curvature of the rod 21, as shown in detail on the figure 4 .
  • the rod 21 can be curved towards the reflector ( figure 2b ) or to the protective surface 29 ( Figure 2c ) of the radome 28 while, independently of this curvature, the protective surface can be connected to the rod 21, by one ( Figure 2c ) or many ( figure 2b ) hooks such as rings 23.
  • the flexible surface 29 is curved by a deforming element arranged at the feed device 26 of the antenna.
  • the deformer element comprises two arms 21b fixed at one end to the waveguide 26 which transmits the electromagnetic waves received or transmitted by the subreflector of the antenna 20 and, at their second end, to points 23 ( figure 2d ) or support ( figure 2e ) of the protective surface 29.
  • the invention thus makes it possible to easily bend the protective surface 29 towards the reflector 22 ( figure 2d ) or out of this antenna 20 ( figure 2e ).
  • the deforming elements can be semi-rigid as springs.
  • the same embodiment can combine a plurality of deforming elements such as a rod 21, and 21 h shrouds.
  • the latter can be formed by a relatively transparent material vis-à-vis the electromagnetic waves transmitted by the antenna, such as fiber of glass.
  • a material formed by a polyester having a density close to 680 g / m 2 has the flexibility required to form radomes used in antennas according to the invention.
  • a radome of the same nature - same material and same thickness - can be implemented with antennas operating in different frequency bands, such as the following frequency bands, in GHz: (2.5 - 3.5), (3.4 - 3.6), (3.6 - 4.2), (4.4 - 5.0), (5.25 - 5.85), (5.725 - 5.85), (5.725 - 6.875), (5.925 - 6.425), (5.925) - 6.875), (6.425 - 7.125) (7.125 - 7.75), (7.125 - 8.5), (7.725- 8.275), (7.75- 8.5), (10.3-10.7), (10.5-10.7), (10.7-11.7) , (12.2-13.25), (12.7 - 13.25), (14.2 - 15.35), (17.7 - 19.7), (21.2 - 23.6), (24.25 - 26.5), (26.3 - 28.5), (27.5 - 29.5). ), (29.5 - 31.5), (31.0 - 33.4), (37.0 -
  • the flexible radome is curved symmetrically with respect to an axis of the antenna defined as the axis of symmetry of the reflector of this antenna, this arrangement being particularly simple and quick to implement.
  • the invention can be implemented using an electromagnetic wave return device for arranging the flexible radome to a cylindrical side screen whose axis is not aligned with the axis of the reflector.
  • the flexible radome can be bent symmetrically with respect to the axis of the cylinder formed by the screen so as to obtain the advantages mentioned above, and in particular to minimize the noise generated by the waves reflected by its protective surface.

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  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)
  • Support Of Aerials (AREA)
EP06124765A 2005-12-06 2006-11-24 Antenne de radiocommunication munie d'un radôme et procédé d'assemblage d'une telle antenne de radiocommunication munie d'un radôme Active EP1796209B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0553744A FR2894391B1 (fr) 2005-12-06 2005-12-06 Antenne de radiocommunication munie d'un radome et procede d'assemblage d'une telle antenne de radiocommunication munie d'un radome

Publications (2)

Publication Number Publication Date
EP1796209A1 EP1796209A1 (fr) 2007-06-13
EP1796209B1 true EP1796209B1 (fr) 2012-04-25

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EP06124765A Active EP1796209B1 (fr) 2005-12-06 2006-11-24 Antenne de radiocommunication munie d'un radôme et procédé d'assemblage d'une telle antenne de radiocommunication munie d'un radôme

Country Status (5)

Country Link
US (1) US7656363B2 (zh)
EP (1) EP1796209B1 (zh)
CN (1) CN1979954B (zh)
AT (1) ATE555517T1 (zh)
FR (1) FR2894391B1 (zh)

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US8836601B2 (en) 2013-02-04 2014-09-16 Ubiquiti Networks, Inc. Dual receiver/transmitter radio devices with choke
US9496620B2 (en) 2013-02-04 2016-11-15 Ubiquiti Networks, Inc. Radio system for long-range high-speed wireless communication
US9634373B2 (en) * 2009-06-04 2017-04-25 Ubiquiti Networks, Inc. Antenna isolation shrouds and reflectors
CN101958461B (zh) * 2010-09-07 2013-11-20 京信通信系统（中国）有限公司 微波天线及其外罩
RU2513718C2 (ru) * 2012-07-06 2014-04-20 Открытое акционерное общество "Обнинское научно-производственное предприятие "Технология" Широкополосная система "антенна-обтекатель"
US20160218406A1 (en) 2013-02-04 2016-07-28 John R. Sanford Coaxial rf dual-polarized waveguide filter and method
US9543635B2 (en) 2013-02-04 2017-01-10 Ubiquiti Networks, Inc. Operation of radio devices for long-range high-speed wireless communication
US9397820B2 (en) 2013-02-04 2016-07-19 Ubiquiti Networks, Inc. Agile duplexing wireless radio devices
ES2767051T3 (es) 2013-10-11 2020-06-16 Ubiquiti Inc Optimización de sistema de radio inalámbrica mediante análisis de espectro persistente
US9985347B2 (en) 2013-10-30 2018-05-29 Commscope Technologies Llc Broad band radome for microwave antenna
WO2015153717A1 (en) 2014-04-01 2015-10-08 Ubiquiti Networks, Inc. Antenna assembly
US10069580B2 (en) 2014-06-30 2018-09-04 Ubiquiti Networks, Inc. Wireless radio device alignment tools and methods
CN108353232B (zh) 2015-09-11 2020-09-29 优倍快公司 紧凑型播音接入点装置
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Also Published As

Publication number Publication date
FR2894391B1 (fr) 2008-01-04
EP1796209A1 (fr) 2007-06-13
ATE555517T1 (de) 2012-05-15
CN1979954B (zh) 2010-09-29
US7656363B2 (en) 2010-02-02
CN1979954A (zh) 2007-06-13
US20070182659A1 (en) 2007-08-09
FR2894391A1 (fr) 2007-06-08

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