EP2811574B1 - Starres Radom für eine Antenne mit Konkavreflektor - Google Patents

Starres Radom für eine Antenne mit Konkavreflektor Download PDF

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Publication number
EP2811574B1
EP2811574B1 EP13305736.4A EP13305736A EP2811574B1 EP 2811574 B1 EP2811574 B1 EP 2811574B1 EP 13305736 A EP13305736 A EP 13305736A EP 2811574 B1 EP2811574 B1 EP 2811574B1
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EP
European Patent Office
Prior art keywords
layer
radome
antenna
surface area
layers
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.)
Active
Application number
EP13305736.4A
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English (en)
French (fr)
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EP2811574A1 (de
Inventor
Armel Le Bayon
Denis Tuau
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 EP13305736.4A priority Critical patent/EP2811574B1/de
Priority to CN201480031960.2A priority patent/CN105264713B/zh
Priority to PCT/IB2014/061920 priority patent/WO2014195869A2/fr
Publication of EP2811574A1 publication Critical patent/EP2811574A1/de
Application granted granted Critical
Publication of EP2811574B1 publication Critical patent/EP2811574B1/de
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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
    • 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
    • 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
    • H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • 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
    • H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • H01Q1/424—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material comprising a layer of expanded material

Definitions

  • the present invention relates to a telecommunication antenna with concave reflector having for example the shape of at least one parabola portion.
  • These antennas in particular of the microwave type, are usually used in mobile communication networks. These antennas operate indifferently in transmitter mode or in receiver mode, corresponding to two opposite directions of RF wave propagation.
  • the reflector is associated with a radome having an impervious protective surface which partitions the space defined by the reflector, with or without a skirt, vis-à-vis the outside.
  • This radome can be flexible or rigid.
  • a rigid radome, the most currently used, has the advantage of good resistance to the external climate environment such as rain, wind or snow.
  • the thickness of the material used in a rigid radome is problematic since this thickness is determined as a function of the frequency band used by the antenna.
  • the thickness of a rigid radome implemented in an antenna transmitting with a frequency of 40 GHz is practically half of the thickness of a rigid radome of the same kind used in an antenna transmitting with a frequency of 20 GHz. It is understood that to use the antenna over a wide frequency band, ranging from 5 to 25 GHz, for example, it is necessary to use five radomes of different thickness. These radomes must be dismantled and replaced at each frequency domain change.
  • radomes having a sandwich structure consisting of a cellular core structure with a thickness of about 3 mm and two external plates having a thickness of order of 0.35 mm each.
  • Such a structure has excellent radio performance for frequencies around 25 GHz, but has more modest performance for frequencies far from this target.
  • This phenomenon is due to the difference between the actual thickness of the radome and the reference thickness which is adapted to the value of a half-wavelength at the center frequency of the bandwidth.
  • a radome having a thickness equal to the reference thickness is called a "half-wave radome".
  • the reflection coefficients of the radome can exceed -20 dB, which affects the performance of the antenna .
  • the prior art US2010103072 describes a shielded radome with honeycomb.
  • the present invention aims to eliminate the disadvantages of the prior art, by providing a rigid radome for operation with satisfactory performance of a parabolic antenna in a wider frequency range than the prior art, without which it is necessary to change it.
  • the present invention therefore aims to improve the performance of the antennas for frequencies below the target frequencies of the radome and the antenna, without the need to change it.
  • the object of the present invention is a radome intended to be mounted on an antenna, said radome comprising a first layer and at least a second layer attached to said first layer so as to increase the effective thickness of said radome on at least a portion of its surface, the area of said second layer being strictly less than 100% of the area of said first layer.
  • the first layer may be made of a rigid or flexible material, and adopt a flat, curved or conical shape.
  • a half-wave radome is usually preferred, which is very thick and therefore expensive material.
  • the present invention makes it possible to adapt a radome with a sandwich-type structure to use at low frequencies while avoiding the use of a radome with a very thick "sandwich” type structure or a radome with a conical shape. or spherical, which is very difficult to achieve with multilayer materials.
  • the second layer of the radome is formed of a material of the same nature as the first layer.
  • the second layer of the radome is attached to the first layer via a spacer so as to space said second layer of said first layer at least over a portion thereof.
  • a radome has spacers allowing a spacing of the first and second layers between 10 mm and 3 mm.
  • the surface of the second layer of the radome may have a shape different from the surface of the first layer.
  • the surface of the second layer of the radome is curved and the surface of the first layer of the radome is flat.
  • the surface of the second layer of the radome is flat and the surface of the first layer of the radome is curved.
  • the second layer may be made of a rigid or flexible material, and adopt a flat or curved shape.
  • the second layer of the radome may have a polygonal surface, such as for example a triangle or a hexagon or a quadrilateral such as a rectangle or a square, or a shaped surface defined by a closed curve such as a circle, an oval or an oblong.
  • the area of the second layer covers at least 70% of the area of said first layer, and preferably at least 50% of the area of said first layer.
  • the second layer is removably attached to the first layer.
  • the space between the first and second layers can be filled with low density foam.
  • a second object according to the present invention is an antenna having a radome according to any one of the above aspects.
  • the second layer of the radome is arranged so as to face a reflector of said antenna.
  • the second layer is disposed on the inner face of the radome facing the waveguide.
  • a third object according to the invention is a method of manufacturing a radome, comprising the following steps: providing a first layer of a radome and fixing a second layer on the surface of said radome so as to increase the effective thickness of said radome the area of said second layer being strictly less than 100% of the area of said first layer.
  • the second layer is secured to the first layer of the radome with spacers so as to space said second layer of said first layer of said radome on at least a portion of said second layer.
  • an antenna 10 provided with its fixing means 12, for example to be fixed on Matt.
  • the antenna 10 comprises a parabolic reflector 14 at the center of which is placed a waveguide (not shown).
  • a radome 20 fixed at its periphery on the reflector 14 covers the dish 14.
  • the attachment points of the radome 20 to the dish 14 are illustrated with the reference 22.
  • the first layer may be made of a rigid or flexible material which allows, as the case may be, to obtain a flat, curved or conical shape.
  • Various materials can be used for the construction of the radome such as a polymer (ABS, PS, PVC, PP) injected or thermoformed. They have in common to attenuate to a minimum the signal sent and received.
  • the radome 20 may for example consist of a sandwich-type multilayer material comprising two dense outer plates surrounding at least one central portion containing a high proportion of air.
  • the outer plates, which are continuous flat thin plates, and the three-dimensional central portion are made of the same polymeric material, preferably polypropylene (PP).
  • the radome 20 may especially be of the "honeycomb” type whose cells have a substantially conical shape or of the "honeycomb” type.
  • first layer 24 For the purposes of the following description, whatever the structure of the first monolayer or multilayer layer 24 of the radome 20, it will be named in the singular "layer”.
  • the composition of the first layer 24 is well known to those skilled in the art and will not be further detailed.
  • a second layer 30 (visible in transparency) is fixed to said first layer 24.
  • the second layer 30 is arranged so as to be in front of the guide of FIG. wave of the antenna 10, that is to say on the inner surface of the radome 20 when it is mounted on the reflector 14.
  • the goal is to make the radome transparent to the waves.
  • a wave meets a radome, there is of course a transmitted wave but also a partially reflected wave.
  • this reflected wave can be canceled over a defined bandwidth. Indeed the waves reflected on the different layers are superimposed and can cancel if the sum of the phases is zero.
  • FIG. 2 illustrates in more detail the internal face of the radome 20 comprising the first layer 24.
  • a second layer 30 is fixed to the first layer 24.
  • the second layer 30 is preferably made of materials of the same nature as for the layer 24. However, since it does not directly undergo the external influences, that is to say the wind and the UV radiation, its mechanical characteristics can be eased.
  • the area of the second layer 30 should be strictly less than 100% of the area of the first layer 24, and preferably the area of the second layer 30 should have at least 50%, and preferably at least 70%, of the the area of the first layer 24 to have a significant radioelectric impact.
  • the second layer 30 may furthermore have any shape, and preferably polygonal shapes such as a hexagon, triangle or quadrilateral such as a parallelogram, a square, a rectangle, a rhombus, a trapezium, etc., although circular or oblong shapes are allowed.
  • a square shape is from the point of view simplicity preferable because easier and less expensive to produce.
  • any other form is possible if the minimum ratio of areas is greater than about 50%.
  • the second layer 30 may be fixed to the first layer 24 in any manner and using all the means available for this purpose according to the constraints known to those skilled in the art.
  • the second layer 30 may in particular be attached to attachment points 32 as illustrated, or plated continuously over the entire surface of the first layer.
  • the attachment points 32 can fix the second layer 30 in contact with the first layer 24, just as these attachment points 32 can also keep the second layer 30 spaced from said first layer 24.
  • the spacing between the first and second layers may vary and not remain constant.
  • the attachment points 32 are preferably made of UV-resistant plastic materials, and of a structure sufficiently strong to hold the two layers in place.
  • the fixing points have a small diameter so that the set of attachment points 32 represents an area less than 0.05% of the surface of the radome.
  • these attachment points 32 between the second layer 30 and the first layer 24 of the radome 20 may in particular be fastening clips, allowing easy attachment of the second layer 32 to the radome 20. These clips 32 can thus allow easy and quick disassembly of the second layer 32.
  • FIGS. 4 to 6 illustrate possible alternative arrangements of the first and second layers 24, 30, i.e., a radome according to various embodiments.
  • the figure 4 illustrates a variant in which the second layer 30 is fixed to the main layer 24 of the radome by attachment points 32 on the periphery of said second layer 30, as well as by one or more central attachment point (s) 32.
  • spacers 44 of equal thickness are mounted co-axially with the attachment points 32 to maintain a constant spacing between said first and second layers.
  • the spacers 44 preferably have a height of between 10 mm and 3 mm.
  • the figure 5 illustrates a variant in which the second layer 30 is fixed to the first layer 24 of the radome by attachment points 32 on the periphery of said second layer 30, as well as by one or more central attachment point (s) 32.
  • one or more struts 54 are mounted co-axially with the attachment points 32 only on the central portion of the first and second layers 24, 30 to have a curved shape, and more particularly to give a convex surface to the second layer 30 with respect to the flat surface of the first layer 24.
  • the struts 54 of the central portion preferably have a height of between 10 mm and 3 mm.
  • the figure 6 illustrates a variant in which the second layer 30 is fixed to the first layer 24 of the radome by attachment points 32 on the periphery of said second layer 30, as well as by one or more central attachment point (s) 32.
  • one or more struts 64 are mounted co-axially with the attachment points 32 only on the peripheral portion of the first and second layers 24, 30 to give the second layer 30 a curved shape, and more particularly so that it has a concave surface with respect to the flat surface of the first layer 24.
  • the struts 64 preferably have a length of between 10 mm and 3 mm. It should be noted that the material of the second layer 30 must have some resilience to bending to allow a curved shape.
  • Figures 7 and 8 illustrate the value of the reflection coefficient R in dB, or standing wave ratio, as a function of the frequency F in GHz of the wave incident on the radome over a frequency range from 6 to 40 GHz, for this radome ( figure 8 ) and a known radome ( figure 7 ).
  • the known radome adapted for operation in the frequency range 20-30 GHz, corresponding to the performances of the figure 7 (curve 107) has a single layer of thickness 3.7 mm.
  • the frequency performance is very good around 25 GHz, but only acceptable in the rest of the field.
  • the radome corresponding to the curve 108 of the value of the reflection coefficient illustrated in FIG. figure 8 comprises a first layer 24 with a thickness of 3.7 mm, and a second layer 30 with a thickness of 3.7 mm, with a spacing between the first and second layers 24 and 30 of 5 mm. It can be seen that an antenna tuned for an optimum response around 25 GHz, including the radome described above, has acceptable performance for frequencies between 6 and 12 GHz.
  • the figure 9 illustrates a curve 110 of the loss P of reflection radiation ("return loss" in English), in dB, as a function of the frequency F in GHZ of the wave incident on the radome over a frequency range from 7.1 GHz at 8.5 GHz, for a parabolic antenna 1 meter in diameter with a radome having a single layer structure "sandwich" 3.7 mm thick already detailed above.
  • the effectiveness of the known radome is limited. Indeed, the radome is not very transparent since the curve 110 has exceedances of the reference line 111, corresponding to the limit value of 18 dB, which occur at different points of the curve 110.
  • this radome comprising a first layer 24 and a second layer 30 with a thickness of 3.7 mm, with a spacing between the first and second layers 24, 30 of 5 mm (similar to the radome of the figure 2 ), the performance over the frequency range 7.1 to 8.5 GHz is quite satisfactory, as illustrated in figure 10 (curve 112). A reflection loss of less than 18 dB is observed over the entire frequency band explored by curve 112.

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Claims (12)

  1. Radom (20), das zur Montage auf einer Antenne (10) mit konkavem Reflektor bestimmt ist, umfassend:
    - eine erste Schicht (24),
    - mindestens eine zweite Schicht (30), die an der ersten Schicht derart befestigt ist, dass die effektive Dicke des Randoms (20) verstärkt wird,
    dadurch gekennzeichnet, dass
    - die Oberfläche der zweiten Schicht (30) um 100 % kleiner als die Oberfläche der ersten Schicht (24) ist,
    - die Fläche der zweiten Schicht (30) eine andere Form als die Fläche der ersten Schicht (24) aufweist,
    - die zweite Schicht (30) an der ersten Schicht (24) mit einer Strebe (44) derart befestigt ist, dass die zweite Schicht (30) von der ersten Schicht (24) über mindestens einen Teil derselben beabstandet ist.
  2. Radom nach Anspruch 1, wobei die zweite Schicht (30) von einem Material derselben Art wie für die erste Schicht (24) gebildet ist.
  3. Radom nach einem der Ansprüche 1 und 2, wobei die Strebe eine Beabstandung der ersten und zweiten Schicht (24, 30) zwischen 10 mm und 3 mm inklusive erlaubt.
  4. Radom nach einem der Ansprüche 1 bis 3, wobei die Fläche der zweiten Schicht (30) des Radoms gekrümmt ist und die Fläche der ersten Schicht (24) des Radoms eben ist.
  5. Radom nach einem der Ansprüche 1 bis 3, wobei die Fläche der zweiten Schicht (30) des Radoms eben ist und die Fläche der ersten Schicht (24) des Radoms gekrümmt ist.
  6. Radom nach einem der vorangehenden Ansprüche, wobei die zweite Schicht (30) eine Fläche polygonaler Form oder begrenzt durch eine geschlossene Kurve aufweist.
  7. Radom nach einem der vorangehenden Ansprüche, wobei die Oberfläche der zweiten Schicht (30) mindestens 70 % der Oberfläche der ersten Schicht (24), vorzugsweise mindestens 50 % der Oberfläche der ersten Schicht (24), bedeckt.
  8. Radom nach einem der vorangehenden Ansprüche, wobei die zweite Schicht (30) lösbar an der ersten Schicht (24) befestigt ist.
  9. Radom nach einem der vorangehenden Ansprüche, wobei der Raum zwischen der ersten und zweiten Schicht (24, 30) mit einem Schaumstoff geringer Dichte gefüllt ist.
  10. Antenne (10), aufweisend ein Radom (20) nach einem der vorangehenden Ansprüche, wobei die zweite Schicht (30) derart ausgebildet ist, dass sie gegenüber einem Reflektor der Antenne ist.
  11. Antenne (10) nach Anspruch 10, wobei die zweite Schicht (30) auf der Innenseite des Radoms gegenüber dem Wellenleiter angeordnet ist.
  12. Verfahren zur Herstellung eines Radoms (20) nach einem der Ansprüche 1 bis 9, umfassend die folgenden Schritte:
    - Bereitstellen einer ersten Schicht eines Radoms,
    - Befestigen einer zweiten Schicht auf der Fläche der ersten Schicht derart, dass die effektive Dicke des Radoms verstärkt wird,
    dadurch gekennzeichnet, dass
    - die Oberfläche der zweiten Schicht um 100 % kleiner als die Oberfläche der ersten Schicht (24) ist,
    - die Fläche der zweiten Schicht (30) eine andere Form als die Fläche der ersten Schicht (24) aufweist,
    - die zweite Schicht (30) an der ersten Schicht (24) mit einer Strebe (44) derart befestigt ist, dass die zweite Schicht (30) von der ersten Schicht (24) über mindestens einen Teil derselben beabstandet ist.
EP13305736.4A 2013-06-03 2013-06-03 Starres Radom für eine Antenne mit Konkavreflektor Active EP2811574B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13305736.4A EP2811574B1 (de) 2013-06-03 2013-06-03 Starres Radom für eine Antenne mit Konkavreflektor
CN201480031960.2A CN105264713B (zh) 2013-06-03 2014-06-03 用于带凹面反射器的天线的刚性天线罩
PCT/IB2014/061920 WO2014195869A2 (fr) 2013-06-03 2014-06-03 Radôme rigide pour une antenne a reflecteur concave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13305736.4A EP2811574B1 (de) 2013-06-03 2013-06-03 Starres Radom für eine Antenne mit Konkavreflektor

Publications (2)

Publication Number Publication Date
EP2811574A1 EP2811574A1 (de) 2014-12-10
EP2811574B1 true EP2811574B1 (de) 2018-08-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13305736.4A Active EP2811574B1 (de) 2013-06-03 2013-06-03 Starres Radom für eine Antenne mit Konkavreflektor

Country Status (3)

Country Link
EP (1) EP2811574B1 (de)
CN (1) CN105264713B (de)
WO (1) WO2014195869A2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113140908A (zh) * 2021-04-15 2021-07-20 大连海事大学 一种宽带圆极化卫星导航移动终端天线罩

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2653716Y (zh) * 2003-08-18 2004-11-03 黎萍 一种吸顶式移动通讯天线
EP2082452B1 (de) * 2006-09-29 2014-06-04 Raytheon Company Geformtes ballistisches radom
CN101364669B (zh) * 2008-09-25 2012-08-29 东华大学 超高分子量聚乙烯增强的雷达罩、其制备方法及应用
US8054239B2 (en) * 2008-10-24 2011-11-08 Raytheon Company Honeycomb-backed armored radome
US8730122B2 (en) * 2008-12-05 2014-05-20 Nec Corporation Antenna device and communication device provided therewith
JP5603636B2 (ja) * 2010-04-09 2014-10-08 古野電気株式会社 レドーム、アンテナ装置、およびレーダ装置

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
WO2014195869A3 (fr) 2015-06-25
CN105264713B (zh) 2018-07-24
CN105264713A (zh) 2016-01-20
WO2014195869A2 (fr) 2014-12-11
EP2811574A1 (de) 2014-12-10

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