EP3529858A1 - Revêtement pour la dissimulation d'objets au rayonnement électromagnétique d'antennes - Google Patents
Revêtement pour la dissimulation d'objets au rayonnement électromagnétique d'antennesInfo
- Publication number
- EP3529858A1 EP3529858A1 EP17804605.8A EP17804605A EP3529858A1 EP 3529858 A1 EP3529858 A1 EP 3529858A1 EP 17804605 A EP17804605 A EP 17804605A EP 3529858 A1 EP3529858 A1 EP 3529858A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- obstacle
- coating
- dielectric
- dielectric coating
- sleeve
- 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
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 84
- 239000011248 coating agent Substances 0.000 title claims abstract description 83
- 230000005670 electromagnetic radiation Effects 0.000 title description 2
- 239000004020 conductor Substances 0.000 claims abstract description 18
- 239000012799 electrically-conductive coating Substances 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 20
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000003989 dielectric material Substances 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 8
- 230000005855 radiation Effects 0.000 description 30
- 230000005684 electric field Effects 0.000 description 21
- 230000005672 electromagnetic field Effects 0.000 description 21
- 239000013598 vector Substances 0.000 description 9
- 230000014509 gene expression Effects 0.000 description 6
- 230000002452 interceptive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009424 underpinning 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
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
- H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- 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
- H01Q19/02—Details
- H01Q19/021—Means for reducing undesirable effects
Definitions
- the invention relates to a device for mitigating the effects of an obstacle on the radiation characteristics of a radio antenna.
- the device presented in the international patent application WO 2014/182398 describes a second technique using a metasurface for reducing or canceling the wave diffracted by the obstacle.
- a first coating configuration consists of a set of metal cones arranged on the periphery of a circular cylindrical metal object, and periodically along a longitudinal axis of said object. Two metal cones are separated from each other by a dielectric.
- a meta-surface for the reduction of the Radar Equivalent Area (SER) of a cylindrical metal object with a circular section, consisting of a quasi-periodic arrangement printed on a dielectric, and enveloping said metal object, is described in the publication "Anisotropic cloaking of a metallic cylinder ", Ladislau Matekovits et al.
- the device according to the invention provides an effective and economical solution to the concealment of objects to an antenna.
- a coating arranged on the obstacle makes it possible to drastically reduce or even cancel the radar equivalent surface of the object by generating an electromagnetic wave interfering with the wave diffracted by the object.
- the device is placed on all or part of a surface of the obstacle to reduce a Radar Equivalent Surface of said obstacle and comprises: a sleeve of a dielectric coating, with a relative dielectric permittivity equivalent to ⁇ q , of height h p , along a longitudinal axis of said ⁇
- the dielectric coating is formed of a single dielectric material.
- the dielectric coating includes a plurality of dielectric materials, wherein a relative dielectric permittivity and a thickness of each of the dielectric materials composing the coating determine the relative dielectric relative permittivity ⁇ q .
- a thickness of the dielectric coating is optimized by direct electromagnetic simulation to adjust said thickness to search for a Minimum Radar Equivalent Surface of the obstacle.
- the obstacle is an elliptical cylinder and the dielectric coating and the electrically conductive coating have substantially the shape of elliptical cylindrical sleeves.
- the dielectric coating is fitted to the obstacle and the conductive coating is fitted to the sleeve of said dielectric coating.
- the obstacle generating ellipse is a circle and the dielectric coating and the electrically conductive coating have substantially the shape of circular cylindrical sleeves.
- the obstacle, the dielectric coating and the conductive coating are slightly curved.
- FIG. 2a shows the radiation pattern, in a horizontal plane, of a vertically polarized monopole omnidirectional antenna.
- Figure 2b already cited represents the radiation pattern, in a horizontal plane, of the antenna of Figure 2a, in the presence of an obstacle.
- Figure 3 is a perspective view of a first embodiment of the invention wherein the obstacle is substantially cylindrical circular section, and the dielectric coating and the metal coating are substantially cylindrical section circular rings.
- Figure 4 shows a perspective view of a cylindrical object of circular section, of infinite height and radius r, exposed to an incident electromagnetic field.
- Figure 7b is a perspective view of a third embodiment of the invention overlying an obstruction in the form of a hexagonal section cylinder.
- FIG. 8b represents the radiation pattern in a horizontal plane of a wired antenna polarized along a vertical axis respectively in the absence of an obstacle, in the presence of a substantially cylindrical electrical conductor obstacle of hexagonal section and of vertical axis, and presence of said electrical conductor obstacle partially covered by a device according to the embodiment of Figure 7b.
- Figure 8c shows the radiation pattern in a horizontal plane of a wired antenna polarized along a vertical axis respectively in absence of obstacle, in the presence of a substantially tubular and curved electrical conductor obstacle, and in the presence of said electrically conductive obstacle partly covered by a device according to the embodiment of FIG. 7c.
- a vector E is defined in Cartesian coordinates by its components (E x , E y , E z ) and in cylindrical coordinates by its components (E p , ⁇ ⁇ , E z ).
- the acronym "SER” will be used throughout the description to refer to an Equivalent Radar Surface of an object.
- the obstacle 10 is for example a support for a device, not shown in the Figure, for example a wired RF reception antenna.
- Figure 2a schematically represents a radiation pattern, the plot 301 illustrating the radiation of an omnidirectional antenna in a horizontal plane, when said antenna is in free field, that is to say that no obstacle disturbs the radiated field by the antenna.
- Figure 2b shows a radiation pattern, the trace 302 illustrating the radiation of the antenna of Figure 2a in the presence of an obstacle 10.
- 3 schematically represents an electrical conductor obstacle comprising a device 20 and exposed to an incident electromagnetic field (E inc ; H inc ) of wavelength ⁇ emitted by an antenna 50, according to one embodiment of the invention.
- E inc represents an incident electric field vector
- H inc represents an incident magnetic field vector.
- the obstacle 10 is substantially cylindrical in shape, of circular section and vertical longitudinal axis, height h and radius r.
- a diameter of the obstacle 10 determines a transverse dimension d maximum of said obstacle.
- the ratio of the diameter of the cylindrical obstacle to the wavelength ⁇ is less than or equal to 1.
- the device 20 is implemented on at least a part of the surface of the obstacle 10 and comprises:
- the dielectric coating 21 is affixed to the surface of the obstacle 10 so as to match the shape of said obstacle.
- the dielectric coating 21 has a thickness t, a relative permittivity z r constituting said substrate, and a height h p tributary to the wavelength ⁇ of the incident OEM.
- the thickness of the metal coating must be sufficient to conduct currents induced by the radiation of the antenna.
- normal unit vector surfaces ⁇ e z of the dielectric coating 21 are not covered by the metal coating 22 so as to allow, during the implementation of the device 20, the radiation of an OEM present in said coating. dielectric.
- the obstacle 10 and the device 20 thus determines an electromagnetic cavity filled by the dielectric material of the dielectric coating 21.
- the principles and operation of the device 20 will be better understood with regard to the development of the theoretical underpinnings underlying the invention which are presented below in a simple case and under simplifying assumptions allowed by the case.
- An orthonormal coordinate system (O; e x ; e y ; e z ) is defined so that a longitudinal axis of revolution of the cylindrical obstacle 10 is of direction substantially parallel to that of the axis (Oz).
- a point M of space can thus be identified by its Cartesian coordinates (x, y, z) or its cylindrical coordinates (p, ⁇ , z).
- An orthogonal trihedron (k inc , E inc , H inc ) formed of a wave vector k inc of ⁇ , the incident electric field E inc and the incident magnetic field H in c, is represented.
- ⁇ is polarized along the axis (Oz), the incident electric field E inc is therefore in the same direction as the axis of revolution of the obstacle 10.
- the wave vector k inc and the incident magnetic field H inc thus belong to the plane (Oxy).
- a diameter of the obstacle 10 determines a transverse dimension d maximum of said obstacle.
- the ratio of the diameter of the cylindrical obstacle to the wavelength ⁇ is less than or equal to 1.
- E ind is sought in the form: ⁇ ⁇ ' ⁇ , ⁇ )
- the radius r of the cylinder is small in front of the wavelength ⁇ ;
- - H2 obstacle 10 is a perfect electrical conductor
- Figure 5 illustrates an obstacle 10 as depicted in Figure 4 and dressed with the device 20 according to the embodiment of Figure 3 of the invention.
- the obstacle 10 is exposed to an OEM as described in Figure 4.
- r is the radius of the obstacle 10
- t is the thickness of the dielectric coating 21
- - ⁇ ⁇ is the relative dielectric permittivity of said dielectric coating; - h p is the height of the device 20;
- the frequency of the transverse magnetic mode TM 0 i of the electromagnetic cavity field (E cav ; H cav ) has for expression:
- the device 20 of FIG. 5 is sized to radiate the transverse magnetic cavity magnetic field (E cav ; H cav ) according to the mode TM 0 i at the wavelength ⁇ of the incident wave.
- An electric field cavity E cav of such an electromagnetic cavity field indeed has a non-zero component along the axis e z ; it is able to interfere with the induced electromagnetic field (Ejn d ; H ind ) radiated by the obstacle 10, in order to cancel the SER ⁇ of said obstacle.
- the height h p of the device 20 must therefore be substantially equal to: In practice, once theoretically established, the value of the height h p can be optimized by electromagnetic simulation
- the incident (E inc ; H inc ) and induced (E in d; H in d) electromagnetic fields are polarized along the z axis.
- the electric field cavity E cav must therefore also be polarized substantially along the same axis without which the total electric field E during the implementation of the device on the obstacle 10 will be substantially different from the total electric field E in the absence of obstacles.
- the device 20 is sized so that the transverse magnetic mode TM 0 i is the fundamental mode of the electromagnetic cavity field (E cav ; H cav ) -
- equation (1) gives the height of the device 20.
- the thickness of the dielectric coating 21 is not constrained to a value.
- the dielectric coating 21 can thus be sized to optimize the efficiency of the device 20. This optimization can for example be performed by electromagnetic simulation, in order to minimize as much as possible the SER ⁇ of the obstacle 10.
- the device 20 makes it possible to act on the value of the modulus of the Fourier coefficient A 0 , in order to reduce it strongly, thus making it possible to reduce the SER ⁇ of the obstacle 10.
- the SER ⁇ of the obstacle 10 is reduced on a frequency band centered on f, substantially corresponding to the bandwidth of the cavity.
- the most important attenuation is at frequency f.
- the device 20 sized as previously described for the frequency f associated with the wavelength ⁇ , said device remains usable for any frequency located in the bandwidth of the electromagnetic cavity formed by the obstacle 10 and the device 20.
- Equations (1), (2) and (3) remain valid in the case of a cylinder of finite height and the above reasoning is similar mutatis mutandis.
- the invention is not limited to the concealment of a substantially cylindrical object with a circular section such as that which served as a support for the reasoning and allowing simplifications of the equations.
- the device 20 is used for concealing objects of varying shapes:
- the dielectric coating 21 and the metal coating 22 of the device 20 are substantially cylindrical sleeves sectional elliptical crown and are implemented on an electrical conductor obstacle 10 having substantially the shape of an elliptical cylinder;
- the dielectric coating 21 and the metallic coating 22 of the device 20 are substantially cylindrical sleeves with a substantially circular ring section and are implemented on a substantially cylindrical electrical conductor obstacle with a hexagonal cross-section in the form of which the dielectric coating is suitable;
- the dielectric coating 21 and the metallic coating 22 of the device 20 form substantially cylindrical sleeves with an annular ring section, in which said dielectric coating and said metal coating are curved and are implemented on a conductive obstacle 10 tubular electric and slightly curved.
- the dielectric coating 21 is composed of a plurality of dielectric materials, solid or otherwise.
- the relative dielectric permittivity z r to be taken into consideration is then an equivalent dielectric relative permittivity ⁇ q , which must be understood as being a dielectric permittivity that would have a homogeneous material substituting for the plurality of dielectric materials of the coating 21, while keeping with the same dimensions, identical physical properties in terms of responses to an electric field.
- the incident electromagnetic field (E inc , H inc ) is radiated by an antenna located near the obstacle 10.
- FIGS. 8a, 8b and 8c each represent the radiation patterns in a horizontal plane of an isotropic monopole-type polarized antenna, polarized along a vertical axis, in the following three cases:
- the dotted line 301 illustrates the radiation of the antenna in the absence of an obstacle
- the trace 302 illustrates the radiation of the antenna in the presence of the electrical conducting obstacle
- the trace 303 illustrates the radiation of the antenna in the presence of said electrical conductor obstacle on which the device 20 is implemented.
- the shapes of the electrically conductive obstacle and the device 20 in the cases of FIGS. 8a, 8b and 8c are respectively those of the embodiments of FIGS. 7a, 7b and 7c.
- FIGS. 8a, 8b and 8c show that the radiation pattern is strongly affected by the presence of the obstacle: the path 302 in the presence of the electrically conductive obstacle is clearly distinguishable from the path 301.
- the path 303 is substantially identical to the path 301, which shows that the implementation of the device 20 on the electrical conductor obstacle 10 allows to find the radiation pattern obtained in the absence of 'obstacle.
- the electrical conducting obstacle 10 is thus made invisible to the radiation of the antenna, at least for the wavelength ⁇ considered.
- FIGS. 9a, 9b and 9c each illustrate a three-dimensional radiation pattern of a monopole-type, isotropic and polarized vertical-axis antenna, respectively, in the absence of an obstacle, in the presence of the electrically conductive obstacle, vertical axis, and in the presence of said electrical conductor obstacle on which is implemented the device 20 according to the embodiment of Figure 3.
- the comparison of FIGS. 9a and 9b show the impact of the presence of the obstacle on the radiation of the antenna.
- the height h p of the coating must be about 65cm.
- Electromagnetic simulations conducted in parallel make it possible to optimize the dimensions of the device 20 to make the obstacle invisible to the antenna.
- the device according to the invention has the following advantages vis-à-vis the prior art:
- the invention can be adapted to cubic, conical or spherical objects, or resulting from a combination of these forms.
- the device according to the invention is for example implemented on an aircraft spar, or on another structure forming a mask for a near VHF antenna.
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Computer Security & Cryptography (AREA)
- Radar, Positioning & Navigation (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Aerials With Secondary Devices (AREA)
- Details Of Aerials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1660282A FR3058001B1 (fr) | 2016-10-24 | 2016-10-24 | Revetement pour la dissimulation d'objets au rayonnement electromagnetique d'antennes |
PCT/FR2017/052938 WO2018078282A1 (fr) | 2016-10-24 | 2017-10-24 | Revêtement pour la dissimulation d'objets au rayonnement électromagnétique d'antennes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3529858A1 true EP3529858A1 (fr) | 2019-08-28 |
EP3529858B1 EP3529858B1 (fr) | 2022-02-23 |
Family
ID=58347474
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17804605.8A Active EP3529858B1 (fr) | 2016-10-24 | 2017-10-24 | Revêtement pour la dissimulation d'objets au rayonnement électromagnétique d'antennes |
Country Status (5)
Country | Link |
---|---|
US (1) | US11381002B2 (fr) |
EP (1) | EP3529858B1 (fr) |
CN (1) | CN109964366A (fr) |
FR (1) | FR3058001B1 (fr) |
WO (1) | WO2018078282A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170133754A1 (en) * | 2015-07-15 | 2017-05-11 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Near Field Scattering Antenna Casing for Arbitrary Radiation Pattern Synthesis |
US11408976B1 (en) * | 2018-04-30 | 2022-08-09 | Fractal Antenna Systems, Inc. | Method and apparatus for detection of a metasurface |
CN113721210B (zh) * | 2021-09-02 | 2023-07-25 | 中国人民解放军国防科技大学 | 基于吸波-对消的深度rcs减缩超表面设计方法及超表面 |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3428923A (en) * | 1967-02-15 | 1969-02-18 | Webb James E | Broadband choke for antenna structure |
JP2000105802A (ja) * | 1998-09-29 | 2000-04-11 | Toshiba Chem Corp | 非接触データキャリア用アンテナ磁芯及び非接触データキャリア用アンテナ並びに非接触データキャリア |
US9677856B2 (en) * | 2006-07-25 | 2017-06-13 | Imperial Innovations Limited | Electromagnetic cloaking method |
US20080165442A1 (en) * | 2006-11-08 | 2008-07-10 | Wenshan Cai | System, method and apparatus for cloaking |
US7795596B2 (en) * | 2008-01-03 | 2010-09-14 | Alcatel-Lucent Usa Inc. | Cloaking device detection system |
US20090218523A1 (en) * | 2008-02-29 | 2009-09-03 | Searete Llc, A Limited Liability Corporation Of The State Of Delaware | Electromagnetic cloaking and translation apparatus, methods, and systems |
US7808722B2 (en) * | 2008-07-28 | 2010-10-05 | The United States Of America As Represented By The Secretary Of The Navy | System and method for inducing far field transparency with negative index materials |
US8253639B2 (en) * | 2008-08-25 | 2012-08-28 | Nathan Cohen | Wideband electromagnetic cloaking systems |
US8315500B2 (en) * | 2008-10-03 | 2012-11-20 | Hewlett-Packard Development Company, L.P. | Metamaterial inclusion structure and method |
US8488247B2 (en) * | 2008-10-06 | 2013-07-16 | Purdue Research Foundation | System, method and apparatus for modifying the visibility properties of an object |
US8867121B2 (en) * | 2009-10-13 | 2014-10-21 | Kent State University | Methods and apparatus for controlling dispersions of nanoparticles |
US8643530B2 (en) | 2010-01-05 | 2014-02-04 | The United States Of America, As Represented By The Secretary Of The Navy | Apparatus for radar target cloaking using polyhedral conducting mesh |
WO2011118710A1 (fr) * | 2010-03-26 | 2011-09-29 | 国立大学法人山口大学 | Enceinte invisible |
JP5375855B2 (ja) * | 2011-02-22 | 2013-12-25 | トヨタ自動車株式会社 | 装飾被膜 |
US20130293437A1 (en) * | 2012-03-22 | 2013-11-07 | Venti Group, LLC | Chokes for electrical cables |
US9095043B2 (en) * | 2013-02-27 | 2015-07-28 | The United States Of America As Represented By The Secretary Of The Navy | Electromagnetic cloak using metal lens |
EP2994957A1 (fr) | 2013-05-07 | 2016-03-16 | Board of Regents, The University of Texas System | Cape d'invisibilité de métasurface conformée chargée sur circuit |
EP3084882B1 (fr) * | 2013-12-16 | 2018-04-11 | Esa European Space Agency | Procédé de conception d'une structure d'antenne à métasurface modulée |
WO2016064478A1 (fr) * | 2014-10-21 | 2016-04-28 | Board Of Regents, The University Of Texas System | Capes de méta-surface à large bande et à double polarisation pour applications d'antenne |
US20170373385A1 (en) * | 2014-11-04 | 2017-12-28 | Board Of Regents, The University Of Texas System | Dielectric-core antennas surrounded by patterned metallic metasurfaces to realize radio-transparent antennas |
CN104538744B (zh) * | 2014-12-01 | 2017-05-10 | 电子科技大学 | 一种应用于金属圆柱体的电磁硬表面结构及其构建方法 |
WO2016204821A1 (fr) * | 2015-06-15 | 2016-12-22 | Commscope Technologies Llc | Bras de dipôle obstrué |
US20170133754A1 (en) * | 2015-07-15 | 2017-05-11 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Near Field Scattering Antenna Casing for Arbitrary Radiation Pattern Synthesis |
US9691509B1 (en) * | 2016-07-27 | 2017-06-27 | Archit Lens Technology Inc. | Terahertz-gigahertz system housing capable of minimizing interference and noise |
-
2016
- 2016-10-24 FR FR1660282A patent/FR3058001B1/fr not_active Expired - Fee Related
-
2017
- 2017-10-24 EP EP17804605.8A patent/EP3529858B1/fr active Active
- 2017-10-24 WO PCT/FR2017/052938 patent/WO2018078282A1/fr active Application Filing
- 2017-10-24 US US16/342,616 patent/US11381002B2/en active Active
- 2017-10-24 CN CN201780065964.6A patent/CN109964366A/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2018078282A1 (fr) | 2018-05-03 |
FR3058001A1 (fr) | 2018-04-27 |
US20190334248A1 (en) | 2019-10-31 |
CN109964366A (zh) | 2019-07-02 |
US11381002B2 (en) | 2022-07-05 |
EP3529858B1 (fr) | 2022-02-23 |
FR3058001B1 (fr) | 2021-09-10 |
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