EP3269009A1 - Réflecteur d'antenne, en particulier pour engin spatial - Google Patents
Réflecteur d'antenne, en particulier pour engin spatialInfo
- Publication number
- EP3269009A1 EP3269009A1 EP16713510.2A EP16713510A EP3269009A1 EP 3269009 A1 EP3269009 A1 EP 3269009A1 EP 16713510 A EP16713510 A EP 16713510A EP 3269009 A1 EP3269009 A1 EP 3269009A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shell
- rear structure
- antenna reflector
- reflector according
- reflector
- 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
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000002131 composite material Substances 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
-
- 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
- H01Q1/288—Satellite antennas
-
- 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
- H01Q19/102—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 of convex toroïdal shape
Definitions
- Antenna reflector in particular for spacecraft
- the present invention relates to an antenna reflector, in particular for an antenna of a spacecraft and in particular of a satellite.
- the present invention applies more particularly to a telecommunication satellite antenna reflector, in particular a large antenna.
- a satellite antenna reflector for example, is a part of an antenna, which makes it possible to reflect and form the electromagnetic wave exchanged between the satellite and the Earth.
- an antenna reflector comprises a rigid structure (shell) provided with a reflective surface, reflecting the electromagnetic waves (radiofrequency), and a reinforcement system provided with a so-called rear structure, which maintains the shell and ensures the connection of the hull to the satellite.
- the shell is secured to the rear structure by a set of flexible fasteners.
- the rear structure of a reflector generally comprises an assembly of rectilinear tubes, linked together at angles.
- This rear structure has a general shape representing a polygon, for example a rectangle, or an assembly of polygons.
- the shells generally have a circular contour, or derived from a circle (such as a truncated circle), to optimize the radio frequency performance of the antenna.
- the polygonal structure is placed in a plane above the shell, and does not allow to marry the overall parabolic shape of the reflector.
- the reflector is geometrically not very compact.
- the length of the fasteners between the shell and the rear structure varies according to their position along the rear structure.
- the lengths of the shell edge (or free edge) there is an optimum length for the fasteners.
- a fastener too long is more sensitive to buckling and decreases the mechanical strength of the fastener (and reflector), and a fastener too short does not allow to leave a sufficiently large flexibility between the structure back and the hull.
- a too short fastening element induces mechanical performance losses in the holding of the junction at the foot of the fastener.
- the use of a polygonal structure induces variations in the lengths of the fasteners, and therefore at least a portion of the fasteners has a non-optimal length.
- the preferred positioning for a fastener is to arrange it radially relative to the shell.
- the fixing elements are not arranged radially everywhere, or it is necessary to add wedges between the fastening elements and the rear structure to ensure a radial position, which increases the mass of the reflector.
- a conventional antenna reflector structure comprising a shell and a rear structure (of a reinforcement system) of polygonal type, as mentioned above, is therefore not optimal.
- the present invention aims to remedy at least some of the aforementioned drawbacks. It relates to an antenna reflector, in particular for a spacecraft and in particular for a satellite, said antenna reflector comprising a shell provided with a first surface which is reflective, and a reinforcement system which is arranged on a second surface of the hull, opposite said first surface, and which comprises a so-called rear structure.
- said rear structure comprises at least one structural part having a generally at least partially circular shape.
- the rear structure is not of the usual completely polygonal type, and comprises at least one part of structure which is circular.
- the use of such a circular structure portion has many advantages to overcome at least some of the aforementioned drawbacks, as specified below.
- said at least one structural portion of said rear structure has a generally circular overall shape.
- said rear structure comprises a plurality of structural parts of generally (completely) circular shapes and of different diameters.
- said shell has a paraboloidal structure with or without local "shaping", and said at least one structural part of said rear structure is arranged on the second surface of the shell so as to to be maintained at a set of fasteners (at all fasteners of this assembly) at a substantially constant distance from said second surface, preferably corresponding to an optimum distance.
- said at least one structural portion of said rear structure has a general mixed shape comprising at least one polygonal portion and at least one circular portion. lar.
- said mixed general form is a truncated circular shape.
- said antenna reflector has at least some of the following characteristics, taken individually or in combination:
- said fixing elements are arranged radially on said second surface of the shell;
- said at least one structural part of the rear structure comprises at least one torus.
- said at least one torus is made in one piece or in a plurality of elements (or pieces) assembled together;
- said rear structure is made of composite material.
- the present invention also relates to a spacecraft, in particular a satellite, which comprises at least one antenna reflector as mentioned above.
- Figures 1 and 2 are schematic views, respectively in section and in plan, of an antenna reflector illustrating the invention.
- Figure 3 is a schematic plan view of a particular embodiment of an antenna reflector provided with a rear structure comprising a plurality of concentric structural parts.
- FIG. 4 is a diagrammatic plan view of a particular embodiment of an antenna reflector having a truncated circular shape.
- the antenna reflector 1 (hereinafter “reflector 1") illustrating the invention and shown schematically in FIG. 1 is a reflector of an antenna, in particular for an antenna of a spacecraft and in particular of a satellite .
- this reflector 1 may be a reflector of an antenna of a telecommunication satellite, in particular of a large antenna, for example with a diameter of the order of two to five meters.
- Such an antenna reflector must meet very strict specifications and present, in particular, a good mechanical strength to existing environments during the launch of the satellite, a surface accuracy, a surface stability during extreme temperature variations such as they exist in orbit, good mechanical strength over an extended temperature range, great lightness, and high stiffness.
- the reflector 1 comprises, as shown very schematically in FIG.
- a shell 2 provided with a first surface, said front surface 3, which is able to reflect electromagnetic waves;
- a reinforcing system 4 which is arranged on a second surface of the shell 2, said rear surface 5, which is opposite to said front surface 3.
- This reinforcement system 4 comprises a main structure called rear structure 6, as well as other elements and usual means (not shown) allowing in particular to fix the reflector 1 on the satellite in question.
- the purpose of the reinforcement system 4 is to maintain the shell 2 and to ensure the connection of the shell 2 to the satellite.
- the shell 2 of the reflector 1 comprises a composite sandwich structure comprising a honeycomb core, which is transparent to the electromagnetic (radio) waves, and on which are affixed a front skin and a back skin.
- Each of the skins comprises one or more plies of posite with, for example, carbon fibers.
- Each fold can be a unidirectional fold or a woven fold.
- the material constituting the front skin (that is to say the reflective front surface 3) of the shell 2 must make it possible to guarantee reflection of the electromagnetic waves.
- a stack of folds of composite material ensures good mechanical performance and light weight.
- the shell may have a specific shape for each reflector considered.
- the rear structure 6 of the reflector 1 comprises at least one structural part 7A, 7B, 7C, 7D having a generally at least partially circular shape.
- the rear structure 6 of the reflector 1, comprising at least one portion of structure 7A, 7B, 7C, 7D which is circular, is not of the usual completely polygonal type.
- the use of such a circular structural portion 7A, 7B, 7C, 7D has many of the advantages set forth below.
- the rear structure 6 of the reflector 1 comprises a single structural portion 7A, this structural portion 7A having a generally circular shape.
- This structural part 7A is arranged concentrically with respect to the shell 2, which is of parabolic type and therefore circular in plan view, as shown in FIG. 2.
- the shell 2 thus has a paraboloidal structure, which has been shown the center O (located on an axis XX) in particular in Figure 2.
- the structural portion 7A of said rear structure 6 is arranged on the rear surface 5 of the shell 2 so as to be located in all points at a substantially constant distance from said rear surface 5.
- the reflector 1 also comprises a plurality of fastening elements 8, specified below, which are arranged between the rear surface 5 of the shell 2 and a surface opposite said structural structure. 6. These fastening elements 8 are intended to secure the reinforcement system 4 and the shell 2.
- the fastening elements 8 are distributed, preferably uniformly, around the periphery of the rear structure 6.
- the rear structure 6 is thus placed in a plane above the shell 2, on the side of its rear surface 5, and allows to marry the (generally parabolic) shape of the reflector 1.
- the reflector 1 is geometrically very compact .
- the fastening elements 8 may correspond to any mechanical element, in particular an angle, for example in the form of a T or an L, making it possible to remotely fix the rear structure 6 to the rear surface 5 of the shell 2 and having a flexibility .
- the preferred positioning for a fastening element 8 is to arrange it radially with respect to the rear surface 5 (rounded) of the shell 2. This makes it possible to create maximum flexibility between the shell 2 and the rear structure 6. Thanks to the circular shape of the rear structure 6, the latter can conform to the shape of the shell 2, and thus over the entire circular portion, the fastening elements 8 can be arranged radially without requiring for example wedges angles, which is particularly advantageous for reasons of ease of assembly and mass reduction.
- the rear structure 6 comprises a plurality of structural portions 7B and 7C.
- These structural parts 7B and 7C have circular general shapes, but with different diameters d1 and d2 respectively.
- the rear structure 6 further comprises connecting tubes 9, preferably rectilinear, which bind together the structural parts 7B and 7C, in particular to improve the mechanical strength.
- these connecting tubes 9 are arranged radially with respect to the structural parts 7B and 7C.
- Such an assembly of rectilinear (or straight) and circular tubes (structural parts) 9 can be used when the rear structure consists of several concentric circular structural parts and rectilinear (preferentially radial) connecting tubes 9 are used to bind the circular parts together.
- the rear structure 6 may therefore include in particular one or more completely circular (rear) structural parts, as shown in FIG. 2 (showing a single circular portion of structure 7A), or it may comprise a combination of circular rear structure parts. and linear connecting tubes, as shown in Figure 3.
- a rear structure 6 with part (s) of circular structure (s) makes it possible to obtain a length D of the shell edge (relative to the radially outer edge 2A of the shell 2) which is constant all around the shell 2, either for the single structural part 7A as in the example of Figure 2, or for the structural part 7B (of the rear structure 6) radially outermost as on the example of FIG. 3. It is thus possible to choose the diameter of this rear structure 7A, 7B to guarantee a length D of shell edge (or free edge) which is optimal, which notably improves the mechanical performance of the reflector 1 with respect to to a usual architecture with a polygonal rear structure.
- the optimum free edge length depends on the material and the thickness of the shell 2, as well as the overall design of the reflector 1. As an illustration, for a large antenna, the optimal length of the free edge can be located between 5 cm and 70 cm. Such a free edge makes it possible to achieve a dissipation of the mechanical energy undergone during the launch, but it is not too long not to induce large displacements of the shell edge.
- the use of a circular shape for the rear structure 6 also makes it possible to maintain a symmetry of revolution of the reflector 1, which decreases the zones of stress concentrations (which are areas of potential weakness of the reflector), and improves the overall performance of the reflector 1.
- the thermal deformation performance of the reflector 1 are increased tenfold (deformations ten times smaller) compared to a similar reflector with a polygonal rear structure.
- the structural portion 7D of said rear structure 6 has a general mixed shape 10 comprising at least one circular portion 11, 12 and at least one polygonal (or rectilinear) portion 13, 14 as shown in Figure 4.
- this general mixed shape 10 is a truncated circular shape, comprising circular portions (or sections) 11 and 12 and rectilinear portions (or sections) 13 and 14 alternating. It also comprises a rectilinear section 15 linking together the two rectilinear parts 13 and 14.
- the reflector 1 also comprises a plurality of fastening elements (not shown) which are arranged between the rear surface 5 of the shell 2 and the surface facing the rear structure 6.
- the fastening elements 8 There is an optimum length for the fastening elements 8. Indeed, a fastener too long is more sensitive to buckling and decreases the mechanical strength of this fastener (and reflector), and a fastener too short does not does not allow to leave enough flexibility between the structure and the hull. In addition, a fastener too short induces mechanical performance losses in the holding of the junction at the foot of the fastener. As an illustration, the optimum length for a fastener 8 is between 3 cm and 40 cm. This optimum length depends on characteristics of the fastening element, such as the material constituting the fastener, its width, its thickness, the type of junction between the fastener and the shell, and the type of junction between the element and the rear structure.
- the rear structure 6 preferably comprises tubes made of carbon-based composite material, which make it possible to ensure mechanical strength and stiffness, and a high inertia of this rear structure to obtain good performance of the complete reflector.
- These tubes may have cross sections of different shapes, for example an ellipse or preferably a round, or sections of polygonal shapes, including rectangular or square.
- each circular structure portion may be a complete torus or several torus portions.
- the torus parts can be assembled together or separated.
- the shape of the rear structure 6 may depend, in particular, the size of the shell 2 and the position of interfaces with the satellite so as to ensure maintenance of the shell 2 at points distributed on its surface.
- the present invention can be applied to reflectors provided with different types of shell, and in particular:
- a rear structure 6 at least partially circular and not completely polygonal.
- the rear structure 6 makes it possible to produce a compact reflector 1, with a rear structure 6 arranged everywhere close to the shell 2. Moreover, it is possible to provide, on the circular part, a constant distance between the rear structure 6 and the shell 2. This distance can be chosen to be equal to the optimum length of the fastening elements 8, which improves the mechanical performance of the reflector 1 with respect to the use of a polygonal structure; - The fastening elements 8 mounted on the rear structure 6 may be arranged radially, which is their optimal position and does not require wedges additional angles; and
- the rear structure 6 is arranged on the circular part at the same distance from the edge 2A of the shell 2.
- the use of a completely circular structure makes it possible to obtain a constant shell edge length D all around the circumference of the shell 2, which can be chosen equal to an optimum length.
- the method of manufacturing the reflector 1, as described above, is as follows.
- the rear structure 6 (at least partially circular) is made of carbon-based composite material. By way of illustration, it can be manufactured by draping pre-impregnated plies, by depositing dry plies, then by low pressure injection molding of liquid resin of the RTM type (for "Resin Transfer Molding") or infusion, then by polymerization of the resin.
- the manufacture of a tubular rear tubular structure 6 is achieved by the use of a toric mold and the composite ply draping on the mold.
- the manufacture of the shell 2 of the reflector 1 is, in turn, performed in the usual manner.
- the assembly of the rear structure 6 is implemented according to methods identical to those used for conventional reflectors, as well as the fixing of the rear structure 6 on the shell 2.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Aviation & Aerospace Engineering (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1500456A FR3033670B1 (fr) | 2015-03-10 | 2015-03-10 | Reflecteur d'antenne, en particulier pour engin spatial |
PCT/FR2016/000039 WO2016142591A1 (fr) | 2015-03-10 | 2016-03-08 | Réflecteur d'antenne, en particulier pour engin spatial |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3269009A1 true EP3269009A1 (fr) | 2018-01-17 |
EP3269009B1 EP3269009B1 (fr) | 2021-08-11 |
Family
ID=53673988
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16713510.2A Active EP3269009B1 (fr) | 2015-03-10 | 2016-03-08 | Réflecteur d'antenne, en particulier pour engin spatial |
Country Status (6)
Country | Link |
---|---|
US (1) | US20180048072A1 (fr) |
EP (1) | EP3269009B1 (fr) |
CA (1) | CA2977890C (fr) |
ES (1) | ES2895500T3 (fr) |
FR (1) | FR3033670B1 (fr) |
WO (1) | WO2016142591A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113036443B (zh) * | 2021-03-04 | 2022-01-28 | 西安电子科技大学 | 一种用于宽带和宽角rcs减缩的光学透明电磁超表面 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5686930A (en) * | 1994-01-31 | 1997-11-11 | Brydon; Louis B. | Ultra lightweight thin membrane antenna reflector |
EP1835565A1 (fr) * | 2006-03-16 | 2007-09-19 | Saab AB | Reflecteur |
JP4702747B2 (ja) * | 2006-03-31 | 2011-06-15 | 日本無線株式会社 | 反射鏡アンテナ支持構造体 |
FR2944155B1 (fr) * | 2009-04-02 | 2016-05-13 | Astrium Sas | Antenne radioelectronique a cornieres de decouplage ameliorees |
US9337544B2 (en) * | 2013-01-07 | 2016-05-10 | Lockheed Martin Corporation | Configurable backing structure for a reflector antenna and corrective synthesis for mechanical adjustment thereof |
WO2015153717A1 (fr) * | 2014-04-01 | 2015-10-08 | Ubiquiti Networks, Inc. | Ensemble d'antennes |
-
2015
- 2015-03-10 FR FR1500456A patent/FR3033670B1/fr active Active
-
2016
- 2016-03-08 CA CA2977890A patent/CA2977890C/fr active Active
- 2016-03-08 WO PCT/FR2016/000039 patent/WO2016142591A1/fr active Application Filing
- 2016-03-08 ES ES16713510T patent/ES2895500T3/es active Active
- 2016-03-08 EP EP16713510.2A patent/EP3269009B1/fr active Active
- 2016-03-08 US US15/554,413 patent/US20180048072A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
FR3033670B1 (fr) | 2018-10-12 |
WO2016142591A1 (fr) | 2016-09-15 |
FR3033670A1 (fr) | 2016-09-16 |
CA2977890A1 (fr) | 2016-09-15 |
EP3269009B1 (fr) | 2021-08-11 |
ES2895500T3 (es) | 2022-02-21 |
CA2977890C (fr) | 2023-02-21 |
US20180048072A1 (en) | 2018-02-15 |
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