EP2377198A1 - Radome for a broadband parabolic antenna - Google Patents
Radome for a broadband parabolic antennaInfo
- Publication number
- EP2377198A1 EP2377198A1 EP09803836A EP09803836A EP2377198A1 EP 2377198 A1 EP2377198 A1 EP 2377198A1 EP 09803836 A EP09803836 A EP 09803836A EP 09803836 A EP09803836 A EP 09803836A EP 2377198 A1 EP2377198 A1 EP 2377198A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radome
- antenna
- outer layers
- cells
- core layer
- 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.)
- Withdrawn
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
- 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 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.
- 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.
- 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.
- 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;
- 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.
Landscapes
- Details Of Aerials (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0858499A FR2939970A1 (en) | 2008-12-11 | 2008-12-11 | RADOME FOR BROADBAND PARABOLIC ANTENNA. |
PCT/FR2009/052486 WO2010067032A1 (en) | 2008-12-11 | 2009-12-10 | Radome for a broadband parabolic antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2377198A1 true EP2377198A1 (en) | 2011-10-19 |
Family
ID=40436283
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09803836A Withdrawn EP2377198A1 (en) | 2008-12-11 | 2009-12-10 | Radome for a broadband parabolic antenna |
Country Status (7)
Country | Link |
---|---|
US (1) | US20110285604A1 (en) |
EP (1) | EP2377198A1 (en) |
JP (1) | JP5330538B2 (en) |
CN (1) | CN102246350A (en) |
BR (1) | BRPI0922202A2 (en) |
FR (1) | FR2939970A1 (en) |
WO (1) | WO2010067032A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106972253A (en) * | 2010-05-17 | 2017-07-21 | 码科泰克公司 | Antenna house |
CN102280709A (en) * | 2011-05-27 | 2011-12-14 | 京信通信系统(中国)有限公司 | Outer cover of broadband shaped antenna and microwave antenna |
US8860626B2 (en) * | 2011-09-29 | 2014-10-14 | Andrew Llc | Folded tab retention twin wall radome and method of manufacture |
EP2843761B1 (en) * | 2013-08-30 | 2018-07-04 | Alcatel- Lucent Shanghai Bell Co., Ltd | Compact antenna system |
US9985347B2 (en) | 2013-10-30 | 2018-05-29 | Commscope Technologies Llc | Broad band radome for microwave antenna |
RU184248U1 (en) * | 2018-03-29 | 2018-10-19 | Владимир Евгеньевич Гершензон | FULL-ROTARY ANTENNA WITH RADIO-TRANSPARENT CIRCLE |
JP6602503B1 (en) * | 2018-09-25 | 2019-11-06 | 三菱電機株式会社 | Radar equipment |
WO2020076918A1 (en) * | 2018-10-12 | 2020-04-16 | Commscope Technologies Llc | Flexible radome structures |
US11226397B2 (en) * | 2019-08-06 | 2022-01-18 | Waymo Llc | Slanted radomes |
WO2023059024A1 (en) * | 2021-10-07 | 2023-04-13 | 엘지이노텍 주식회사 | Radar device and driving method therefor |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3432859A (en) * | 1963-01-29 | 1969-03-11 | Gen Electric | Radome and method for making same |
JPH03128504A (en) * | 1989-07-26 | 1991-05-31 | Mitsui Toatsu Chem Inc | Cover for satellite broadcast reception antenna |
JP3871255B2 (en) * | 2001-11-01 | 2007-01-24 | アンテン株式会社 | Radome |
US7042407B2 (en) | 2003-08-14 | 2006-05-09 | Andrew Corporation | Dual radius twist lock radome and reflector antenna for radome |
US7161553B2 (en) * | 2004-11-04 | 2007-01-09 | Courtney Michael J | Satellite antenna cover |
GB2431293A (en) * | 2005-10-14 | 2007-04-18 | Marconi Comm Gmbh | Cladding for a perpendicular polarised antenna |
FR2894391B1 (en) * | 2005-12-06 | 2008-01-04 | Alcatel Sa | RADIO COMMUNICATION ANTENNA WITH RADOME AND METHOD FOR ASSEMBLING SUCH A RADIO RADIO ANTENNA WITH RADOME |
JP2007201868A (en) * | 2006-01-27 | 2007-08-09 | Mitsubishi Electric Corp | Transmission/reception antenna for radar equipment |
JP2007228065A (en) * | 2006-02-21 | 2007-09-06 | Mitsubishi Electric Corp | Method of forming radome, and radome structure by this method |
-
2008
- 2008-12-11 FR FR0858499A patent/FR2939970A1/en not_active Withdrawn
-
2009
- 2009-12-10 BR BRPI0922202A patent/BRPI0922202A2/en not_active IP Right Cessation
- 2009-12-10 US US13/132,473 patent/US20110285604A1/en not_active Abandoned
- 2009-12-10 EP EP09803836A patent/EP2377198A1/en not_active Withdrawn
- 2009-12-10 CN CN200980149964XA patent/CN102246350A/en active Pending
- 2009-12-10 WO PCT/FR2009/052486 patent/WO2010067032A1/en active Application Filing
- 2009-12-10 JP JP2011540178A patent/JP5330538B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2010067032A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2939970A1 (en) | 2010-06-18 |
JP2012511856A (en) | 2012-05-24 |
BRPI0922202A2 (en) | 2018-10-16 |
CN102246350A (en) | 2011-11-16 |
WO2010067032A1 (en) | 2010-06-17 |
JP5330538B2 (en) | 2013-10-30 |
US20110285604A1 (en) | 2011-11-24 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20110711 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR |
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DAX | Request for extension of the european patent (deleted) | ||
111Z | Information provided on other rights and legal means of execution |
Free format text: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR Effective date: 20130410 |
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17Q | First examination report despatched |
Effective date: 20140213 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ALCATEL LUCENT |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20140624 |