WO2010067032A1 - Radome pour antenne parabolique large bande - Google Patents
Radome pour antenne parabolique large bande Download PDFInfo
- Publication number
- WO2010067032A1 WO2010067032A1 PCT/FR2009/052486 FR2009052486W WO2010067032A1 WO 2010067032 A1 WO2010067032 A1 WO 2010067032A1 FR 2009052486 W FR2009052486 W FR 2009052486W WO 2010067032 A1 WO2010067032 A1 WO 2010067032A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radome
- antenna
- outer layers
- cells
- core layer
- Prior art date
Links
- 239000000463 material Substances 0.000 claims abstract description 34
- 230000001413 cellular effect Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 21
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 229920001155 polypropylene Polymers 0.000 claims description 8
- 239000012792 core layer Substances 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- H01Q1/42—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
- 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
- H01Q19/13—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 the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
- H01Q19/134—Rear-feeds; Splash plate feeds
Definitions
- the present invention relates to a radome for a satellite dish for use over a wide frequency band (5 to 25 GHz). It also extends to an antenna provided with this radome.
- Satellite dishes are usually used as radiocommunication antennas.
- Such an antenna comprises a main reflector having a concavity in the form of a paraboloid of revolution about the axis of symmetry of this 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.
- the presence of the screen increases the wind angle of the antenna and the risk of accumulation of pollutants.
- the screen is associated with a radome which has an impervious protective surface partitioning the space defined by the reflector and the screen vis-à-vis the outside. This radome can be flexible or 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. It also has the advantage of being sufficiently transparent vis-à-vis the waves transmitted by the antenna over a bandwidth covering different radio applications.
- the surface of the radome while reflecting waves disrupts the operation of the antenna and may reduce its performance. To limit these disturbances, it is known to tilt the surface of the radome relative to the axis of the antenna to introduce a phase difference between the reflected waves so that the disturbances generated by these reflected waves can not be added between they.
- such a flexible radome has disadvantages related to a relative fragility and a complex system of attachment to the skirt of the antenna requiring auto-tensing elements for its setting and its maintenance under tension, such as springs.
- a rigid radome has the advantage of good resistance vis-à-vis the external climate environment such as rain, wind or snow.
- a rigid radome has a symmetrical surface with respect to the axis of the antenna.
- the most commonly used rigid radomes are tapered, as for example that described in US Pat. No. 7,042,407.
- the radome is made of a dielectric material, such as a polymer (polycarbonate, ASA, ABS, PS, PVC, PP, ...), fiberglass, etc.
- a conical radome can be injection molded or thermoformed. When the material does not allow it or when the diameter is too large, the radome can only be flat.
- Document EP-1 796 209 discloses rigid radomes having a concavity of circular symmetry with respect to the axis of the antenna, which makes it possible to arrange it on a screen without considering the orientation of the radome relative to the axis of the antenna.
- 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 wavelength of the order of 40 GHz is practically half the thickness of the thickness of a rigid radome of the same nature.
- implemented in an antenna transmitting with a wavelength of the order of 20 GHz It is understood that to use the antenna over a wide frequency band, ranging from 5 to 25 GHz, it is necessary to use five radomes of different thickness. These radomes must be dismantled and replaced at each frequency domain change.
- a radome must have the following qualities:
- UV ultraviolet
- the present invention aims to eliminate the disadvantages of the prior art, by providing a rigid radome for the operation of a parabolic antenna in a wider frequency range than the prior art, without the need to change it.
- the present invention relates to a circular rigid radome for a broadband parabolic antenna, characterized in that it is folded in a diameter towards the inside of the antenna, thus forming two half-disks.
- the two half-disks are at an angle less than or equal to 12 ° with the plane perpendicular to the axis of the antenna. This angle is preferably between 4 ° and 12 °.
- This particular form of radome allows the reflected waves to be absorbed by the screen. Thus the reflected waves no longer cause disturbances.
- the fold can be obtained by mechanical or thermal action on the material of the radome.
- a radome material must have as main property to be as transparent as possible with respect to the waves. It must also have sufficient mechanical rigidity and good resistance to environmental conditions for several years. Of course, one will preferably choose a cheap and easy to work material.
- the present invention therefore also relates to a radome for a broadband parabolic antenna as described above, consisting of a sandwich-type multilayer material comprising two outer layers surrounding at least one cellular core layer whose cells have a substantially conical shape.
- This shape substantially improves the passage of electromagnetic waves.
- the outer layers which are continuous flat plates of polymeric material. More preferably, the three-dimensional central layer is made of the same material.
- a multilayer material has the advantage of having good mechanical strength and improved radio performance compared to a monolayer material. However, it is thicker, heavier and more expensive. In addition radio performance can be degraded by the dielectric material of the core layers.
- a sandwich-type material whose central layer contains little material, such as for example a foam or a honeycomb, no longer has this disadvantage but it remains expensive and its mechanical strength is lower.
- the radome material according to the present invention has very thin outer layers which are favorable to the operation of the antenna over a wide frequency band.
- the inner layer contains a high proportion of air which makes it light.
- the polymeric material used contributes to reducing the cost of the radome.
- the cells have the shape of a truncated cone comprising a recess at half height. This particular shape of the cells makes the material very mechanically strong and improves the passage of electromagnetic waves.
- the invention also relates to a parabolic antenna capable of operating in the 7-25 GHz frequency range provided with a radome having a substantially circular shape, bent along a diameter towards the inside of the antenna.
- FIG. 1 is a sectional view of an antenna carrying a radome according to one embodiment of the invention
- FIG. 2 is a perspective view of the antenna of FIG. 1;
- FIG. 3 is a sectional view of the material of the radome according to one embodiment of the invention;
- FIG. 4 is a perspective view of the material of the radome of FIG. 3;
- FIG. 5 shows a comparison of the radio performance of the radome according to one embodiment of the invention with those of the radomes of the prior art.
- the reflection coefficient R in dB is given on the ordinate, and in abscissa the frequency F in GHz.
- an antenna 10 provided with its fastening means 11, for example on a mast.
- the antenna 10 comprises a parabolic reflector 12 at the center of which is placed a waveguide 13.
- a screen or skirt 14, covered internally with an absorbent coating 15, is fixed to the periphery of the parabolic reflector 12.
- a fixed radome 16 at its periphery on the skirt 14 covers the parabola 12.
- the radome 16 has a fold 17 according to one of its diameters defining two half-disks 16a and 16b. The two half-disks 16a and 16b make an angle ⁇ between 4 ° and 12 ° with the plane 18 perpendicular to the axis of the antenna.
- This conformation of the radome 16 allows a wave 19 emitted by the waveguide 13 to reflect on the parabolic reflector 12, then to move (arrow 20) to the radome 16 on which it is reflected again.
- the wave is directed (arrow 21) to the absorbent coating 15 of the skirt 14 in which it is absorbed without disturbing the waves 19, 19 ', 19 "emitted by the waveguide 13 .
- FIG 2 shows a perspective view of the antenna 10 of Figure 1, provided with its radome 16, fixed on a mast 22 by the fastening means 11 it carries.
- the radome 16 is fixed on the periphery of the skirt 14 by means of a ring 23 of injected plastic whose shape is adapted.
- FIGS 3 and 4 are respectively a section and a partial perspective view of the material constituting the radome.
- This material comprises an upper layer 30 consisting of a flat plate of polymeric material, such as polypropylene, and a lower layer 31 consisting of a plate of polymeric material which may be similar to or different from that of the layer 30.
- the outer layers 30, 31 must be thin and have a very low dielectric constant.
- the layers 30 and 31 here have a thickness of the order of 0.55 mm.
- the layers 30 and 31 surround an intermediate layer 32 formed of cells 33 filled with air.
- the intermediate layer 32 has a thickness of between 3.8 mm and 4.7 mm, and a low dielectric constant ⁇ r of the order of 1.
- the cells 33 are of substantially conical shape, the truncated cones being arranged alternately in a sense and in the other.
- the walls of the cones are of polymeric material, such as for example polypropylene, and have a constant thickness to facilitate the welding or gluing of the layer 32 on the layers 30 and 31.
- the cells 33 are filled with air for a greater lightness of the radome.
- the cells comprise a recess 34 located about halfway up the cones.
- This recess makes it possible to stiffen the walls of the cells and to reinforce the mechanical strength of the intermediate layer 32 and of the entire material.
- the fold of the radome according to one of its diameter can be obtained by mechanical or thermal action on the material.
- the mechanical action may for example be a simple cold bending, and the thermal action may be for example the passage of a hot wheel on the material.
- FIG. 5 compares the radioelectric performances of the radome according to the embodiment of the invention (curve 50) represented in the preceding figures with those of the known radomes (curves 51 to 53).
- the reflection coefficient R has been represented as a function of the frequency F of the wave incident on the radome.
- Curve 54 materializes the limit of acceptable performance for a radome which corresponds to a reflection coefficient of -20 dB. Above this value, the antenna radiation pattern or the "return loss" may be disturbed.
- the performance of the radome represented by the curve 50 is always below the acceptable performance limit represented by the curve 54. It is understood that a radome according to an embodiment of FIG. the invention is effective on a frequency band considerably wider than the radomes of the prior art and therefore allows to work on the entire band without the need to change the radome.
Landscapes
- Details Of Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09803836A EP2377198A1 (fr) | 2008-12-11 | 2009-12-10 | Radome pour antenne parabolique large bande |
CN200980149964XA CN102246350A (zh) | 2008-12-11 | 2009-12-10 | 用于宽带抛物线天线的天线屏蔽器 |
BRPI0922202A BRPI0922202A2 (pt) | 2008-12-11 | 2009-12-10 | "cúpula de radar para antena parabólica banda larga". |
US13/132,473 US20110285604A1 (en) | 2008-12-11 | 2009-12-10 | Radome for broadband parabolic antenna |
JP2011540178A JP5330538B2 (ja) | 2008-12-11 | 2009-12-10 | 広帯域パラボラアンテナのレーダド−ム |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0858499A FR2939970A1 (fr) | 2008-12-11 | 2008-12-11 | Radome pour antenne parabolique large bande. |
FR0858499 | 2008-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010067032A1 true WO2010067032A1 (fr) | 2010-06-17 |
Family
ID=40436283
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2009/052486 WO2010067032A1 (fr) | 2008-12-11 | 2009-12-10 | Radome pour antenne parabolique large bande |
Country Status (7)
Country | Link |
---|---|
US (1) | US20110285604A1 (fr) |
EP (1) | EP2377198A1 (fr) |
JP (1) | JP5330538B2 (fr) |
CN (1) | CN102246350A (fr) |
BR (1) | BRPI0922202A2 (fr) |
FR (1) | FR2939970A1 (fr) |
WO (1) | WO2010067032A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102280709A (zh) * | 2011-05-27 | 2011-12-14 | 京信通信系统(中国)有限公司 | 宽频带赋形天线外罩及微波天线 |
WO2013046065A1 (fr) * | 2011-09-29 | 2013-04-04 | Andrew Llc | Radôme à double paroi à fixation par pattes repliées, ainsi que procédé de fabrication |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2571756B1 (fr) * | 2010-05-17 | 2018-05-16 | Pepperl+Fuchs Gmbh | Radôme |
EP2843761B1 (fr) * | 2013-08-30 | 2018-07-04 | Alcatel- Lucent Shanghai Bell Co., Ltd | Système d'antenne compact |
US9985347B2 (en) | 2013-10-30 | 2018-05-29 | Commscope Technologies Llc | Broad band radome for microwave antenna |
RU184248U1 (ru) * | 2018-03-29 | 2018-10-19 | Владимир Евгеньевич Гершензон | Полноповоротная антенна с радиопрозрачным обтекателем |
JP6602503B1 (ja) * | 2018-09-25 | 2019-11-06 | 三菱電機株式会社 | レーダ装置 |
EP3834252A4 (fr) | 2018-10-12 | 2022-05-25 | CommScope Technologies LLC | Structures de radôme souple |
US11226397B2 (en) * | 2019-08-06 | 2022-01-18 | Waymo Llc | Slanted radomes |
WO2023059024A1 (fr) * | 2021-10-07 | 2023-04-13 | 엘지이노텍 주식회사 | Dispositif radar et son procédé de commande |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3432859A (en) * | 1963-01-29 | 1969-03-11 | Gen Electric | Radome and method for making same |
US7042407B2 (en) | 2003-08-14 | 2006-05-09 | Andrew Corporation | Dual radius twist lock radome and reflector antenna for radome |
GB2431293A (en) * | 2005-10-14 | 2007-04-18 | Marconi Comm Gmbh | Cladding for a perpendicular polarised antenna |
EP1796209A1 (fr) | 2005-12-06 | 2007-06-13 | Alcatel Lucent | Antenne de radiocommunication munie d'un radôme et procédé d'assemblage d'une telle antenne de radiocommunication munie d'un radôme |
JP2007201868A (ja) * | 2006-01-27 | 2007-08-09 | Mitsubishi Electric Corp | レーダ装置用送受信アンテナ |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03128504A (ja) * | 1989-07-26 | 1991-05-31 | Mitsui Toatsu Chem Inc | 衛星放送受信アンテナ用カバー |
JP3871255B2 (ja) * | 2001-11-01 | 2007-01-24 | アンテン株式会社 | レドーム |
US7161553B2 (en) * | 2004-11-04 | 2007-01-09 | Courtney Michael J | Satellite antenna cover |
JP2007228065A (ja) * | 2006-02-21 | 2007-09-06 | Mitsubishi Electric Corp | レドームの成形方法、この方法によるレドーム構造体 |
-
2008
- 2008-12-11 FR FR0858499A patent/FR2939970A1/fr not_active Withdrawn
-
2009
- 2009-12-10 BR BRPI0922202A patent/BRPI0922202A2/pt not_active IP Right Cessation
- 2009-12-10 US US13/132,473 patent/US20110285604A1/en not_active Abandoned
- 2009-12-10 CN CN200980149964XA patent/CN102246350A/zh active Pending
- 2009-12-10 EP EP09803836A patent/EP2377198A1/fr not_active Withdrawn
- 2009-12-10 JP JP2011540178A patent/JP5330538B2/ja not_active Expired - Fee Related
- 2009-12-10 WO PCT/FR2009/052486 patent/WO2010067032A1/fr active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3432859A (en) * | 1963-01-29 | 1969-03-11 | Gen Electric | Radome and method for making same |
US7042407B2 (en) | 2003-08-14 | 2006-05-09 | Andrew Corporation | Dual radius twist lock radome and reflector antenna for radome |
GB2431293A (en) * | 2005-10-14 | 2007-04-18 | Marconi Comm Gmbh | Cladding for a perpendicular polarised antenna |
EP1796209A1 (fr) | 2005-12-06 | 2007-06-13 | Alcatel Lucent | Antenne de radiocommunication munie d'un radôme et procédé d'assemblage d'une telle antenne de radiocommunication munie d'un radôme |
JP2007201868A (ja) * | 2006-01-27 | 2007-08-09 | Mitsubishi Electric Corp | レーダ装置用送受信アンテナ |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102280709A (zh) * | 2011-05-27 | 2011-12-14 | 京信通信系统(中国)有限公司 | 宽频带赋形天线外罩及微波天线 |
WO2012163237A1 (fr) * | 2011-05-27 | 2012-12-06 | 京信通信系统(中国)有限公司 | Radôme d'antenne façonné en large bande et antenne à hyperfréquences |
WO2013046065A1 (fr) * | 2011-09-29 | 2013-04-04 | Andrew Llc | Radôme à double paroi à fixation par pattes repliées, ainsi que procédé de fabrication |
EP2761694A4 (fr) * | 2011-09-29 | 2015-05-27 | Commscope Technologies Llc | Radôme à double paroi à fixation par pattes repliées, ainsi que procédé de fabrication |
Also Published As
Publication number | Publication date |
---|---|
FR2939970A1 (fr) | 2010-06-18 |
JP5330538B2 (ja) | 2013-10-30 |
JP2012511856A (ja) | 2012-05-24 |
BRPI0922202A2 (pt) | 2018-10-16 |
CN102246350A (zh) | 2011-11-16 |
US20110285604A1 (en) | 2011-11-24 |
EP2377198A1 (fr) | 2011-10-19 |
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