EP2451007B1 - Vorrichtung zum Aussenden von Funkwellen, Antenne und Raumschiff - Google Patents

Vorrichtung zum Aussenden von Funkwellen, Antenne und Raumschiff Download PDF

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Publication number
EP2451007B1
EP2451007B1 EP11186580.4A EP11186580A EP2451007B1 EP 2451007 B1 EP2451007 B1 EP 2451007B1 EP 11186580 A EP11186580 A EP 11186580A EP 2451007 B1 EP2451007 B1 EP 2451007B1
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EP
European Patent Office
Prior art keywords
membrane
face
reflector
tensioners
equipment
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Active
Application number
EP11186580.4A
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English (en)
French (fr)
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EP2451007A1 (de
Inventor
M. Jean-Luc Bouguereau
M. Fabien Calmettes-Carensac
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Thales SA
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Thales SA
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Publication date
Application filed by Thales SA filed Critical Thales SA
Publication of EP2451007A1 publication Critical patent/EP2451007A1/de
Application granted granted Critical
Publication of EP2451007B1 publication Critical patent/EP2451007B1/de
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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
    • H01Q1/427—Flexible radomes
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49016—Antenna or wave energy "plumbing" making

Definitions

  • the field of the invention is that of telecommunication antennas intended to emit radio waves. These antennas are used on the ground or well in the space where they are embraded aboard telecommunication satellites.
  • the radio radiation is conventionally emitted by a source coupled to one or more reflectors or only by a radiating panel emitting the radio radiation directly towards the space.
  • thermoelastic deformations of the reflector or the radiating panel come from the cyclic thermal variations caused by the alternation of passages of shadow zones and zones of exposure to solar rays.
  • emitting equipment means reflector or radiating panel.
  • a thermal protection membrane is generally disposed between an active face of the transmitter equipment and the space to thermally isolate the transmitter equipment and limit the thermoelastic deformations. It is more particularly multi-layer protection membranes comprising a stack of polyimide layers.
  • the polyimide used is well known to those skilled in the art, it is, for example, a Kapton layer R on which is deposited Germanium. This insulation is extremely light. Moreover, this insulation has the advantage of being generally transparent to radio waves.
  • the membrane When mounting the membrane on a reflector, it is sought to prevent the membrane from sticking to the concave reflective face of the reflector to prevent deterioration of the reflector due to aerodynamic flows that heat its surface.
  • the Germanium focuses the sun's rays, which has the effect of damaging the elements in the path of a ray reflected by the concave reflecting surface of the reflector as, for example, a radiofrequency source or a secondary reflector.
  • the membrane is extended between the concave face of the reflector or the radiating panel and the space and is fixed the periphery of the membrane on the edge of the reflector separating the active surface of the inactive surface of the reflector or panel.
  • the membrane and the emitting equipment undergo, due to their design in different materials, different dilations / retractions when the temperature varies.
  • Kapton is not totally transparent to radiofrequency waves.
  • the membrane thus induces phase shifts on the radiation reflected by a reflector or radiated by the radiating panel.
  • the value of the phase shift depends on the positioning of the membrane relative to the active surface emitting, that is to say, reflecting or radiating, the radio waves.
  • the tensioners are folded in a U between the membrane and the slice 5 of the reflector 2 so that they apply a force E on the membrane towards the outside of the reflector which permanently tends the membrane like a drum skin between the active face and the space.
  • this solution can be implemented only on the bi-grid reflectors, it is not implantable on single reflectors or on the radiating panels because the edge of these equipment separating the active surface from the inactive surface, offers no smooth surface for bonding.
  • An object of the present invention is to overcome the aforementioned drawbacks.
  • Another object of the invention is to overcome this disadvantage.
  • the subject of the invention is a device for transmitting radio waves comprising a transmitter equipment for a telecommunication antenna, a thermal protection membrane for the reflector and means for fixing the thermal protection membrane on the equipment, said thermal protection membrane being provided with a plurality of elastic tensioners provided to maintain the thermal protection membrane stretched between a first active face of the emitting equipment and the space, independently of the thermal expansions of the membrane and the equipment emitter occurring in a predetermined temperature range, when the fastening means ensure the attachment of the membrane to said transmitting equipment.
  • the predetermined temperature range is from - 250 ° C to + 400 ° C.
  • the membrane fixing means comprise first fastening means integral with the membrane. providing separation between the tensioners and the edge of the membrane to ensure contact between the transmitting equipment and the tensioners when the fastening means ensure the attachment of the membrane on said transmitting equipment.
  • the fixing means comprise second fixing means fixed on a second inactive face of the transmitting equipment and are intended to cooperate with the first fixing means to ensure the attachment of the membrane to the transmitter equipment.
  • the elastic tensioners comprise flexible blades having a stiffness greater than the stiffness of the membrane.
  • the flexible blades having a stiffness of between 5 N / m and 500 N / m.
  • the flexible blades are made of poly-para-phenylene terephthalamide PPD-T or polyimide.
  • the flexible blades have a thickness of between 0.1 mm and 2 mm.
  • the flexible blades are Kapton R blades having a thickness 10 to 20 times greater than the thickness of the membrane
  • the flexible blades are arranged so that they straddle the joint between a second inactive face of the panel and a slice of the transmitting equipment, connecting the first active face and the second inactive face, when the fastening means provide the attachment of the membrane to said transmitting equipment, the blades being further dimensioned so that they are flexed over the entire predetermined temperature range.
  • the flexible blades are pressed against the membrane.
  • the elastic tensioners are arranged so as to exert an additional force on the membrane in the direction perpendicular to the force and in the direction of the space so as to keep the membrane spaced apart from the first active face of the transmitting equipment. any point of the said first active face.
  • the transmitter equipment is a reflector.
  • the reflector is parabolic.
  • the transmitter equipment is a radiating panel.
  • the first active face is concave.
  • the first active face is flat.
  • the invention also relates to an antenna comprising a device according to the invention.
  • the invention further relates to a spacecraft comprising an antenna according to the invention.
  • the proposed solution makes it possible, because the tensioners are attached to the membrane, to limit as much as possible the downtime of the transmitting equipment which must be available to undergo numerous tests before being sent into space. It also ensures a permanent tension of the membrane.
  • the antenna is subjected to various tests that lead to install and remove the membrane several times on the transmitter equipment.
  • the proposed solution makes it possible to obtain a reproducibility of the mounting of the membrane on the transmitting equipment. In other words, it makes it possible to guarantee the same positioning of the membrane on the transmitter equipment at each new assembly.
  • the membrane-induced disturbances to the radiation emitted by the membrane are always the same over the lifetime of the antenna on the ground.
  • FIG. 2a and 2b there is shown a section of a telecommunication antenna 10 according to the invention, comprising a source 11 positioned at the focus of a device 12 for emitting radio waves according to the invention.
  • This device 12 comprises a reflector 13 on which radio waves are intended to be reflected from the source.
  • the source may be replaced by a receiver.
  • the waves are then reflected back to the receiver.
  • the telecommunication antenna may be for space or terrestrial applications.
  • the reflector 13 comprises a first active face 15 and a second inactive face 16. These faces are, on the realization of the figure 2a , substantially parallel.
  • the first face 15 and the second face 16 are joined via a wafer 17 extending continuously to the periphery of the two faces 15, 16.
  • a membrane separates the first face 15 of the space.
  • the reflector is parabolic.
  • the first active face 15 is concave.
  • the second face 16 is convex.
  • the reflector is simple, it consists of a single individual reflector.
  • the invention also applies to bigrille reflectors comprising two individual reflectors arranged one behind the other as previously described. In this case, the first face belongs to a first individual reflector and the second face belongs to a second individual reflector.
  • the device for reflecting radio waves further comprises a membrane 18 for thermal protection of the reflector 13, and fixing means 19, 20 of the thermal protection membrane 18 to the reflector 13.
  • the membrane 18 is a multilayer protective membrane comprising a stack of polyimide layers.
  • the polyimide used is well known to those skilled in the art, it is for example a Kapton R Germanized film (Kapton R with germanium deposition) developed by the company DuPont de Neumours.
  • Transparent thermal protection membranes for electromagnetic waves are chosen over the entire range of frequencies used in space telecommunications.
  • the thermal protection membranes conventionally have a thickness of between 0.025 mm and 0.2 mm (Kapton sheet assembly and separators) and a modulus of elasticity of between 2 GPa and 2.5GPa.
  • the modulus of elasticity depends on the temperature.
  • the membrane 18 separates the first face 15 of the reflector 13 and the space so as to provide thermal protection of the reflector 13. In other words, any point of the first face 15 is separated from the space by the membrane 18.
  • the dimensions of the membrane are chosen according to this condition. Moreover, the dimensions of the membrane 18 are chosen to allow the membrane 18 to be secured to the second face 16 of the latter by means of the fastening means 19, 20.
  • the membrane fixing means comprise first fixing means 19 secured to the membrane 18.
  • the first fixing means 19 are fixed on the periphery of the inner face 21 of the membrane 18.
  • the inner face 21 is the face of the membrane 18 which is intended to face the reflector 13, and the outer face 22 of the membrane 18 is the face of the membrane which is intended to be oriented towards the space.
  • the first fixing means are intended to cooperate with the reflector 13 to secure the membrane to the reflector.
  • first fastening means 19 are intended to cooperate with the second face of the reflector 16.
  • the fixing means are able to fix the membrane removably to the reflector but one could also use permanent fixing means.
  • the fixing means further comprise second fastening means 20 secured to the reflector. They are fixed on the periphery of the inner face of the diaphragm 25.
  • the second fastening means are fixed on the second face 16 ( figure 2b ).
  • the first fastening means 19 are intended to cooperate with the second fastening means 20 for fixing the diaphragm 18 to the reflector 13.
  • fastening means hooks and loops are, for example, marketed under the name of Velcro R.
  • the membrane 18 is provided with a plurality of elastic tensioners 23, shown in bold on the figure 2a , provided to maintain the membrane 18 tautly between the first face 15 of the reflector and the space, independently of the thermal expansions of the membrane 18 and the reflector 13 occurring in a predetermined temperature range, when the means of fixing 19, 20 ensure the attachment of the membrane on the reflector.
  • the membrane then forms a substantially flat surface between the first face of the reflector and the space.
  • the thermal protection membrane 18 is provided with a plurality of elastic tensioners 23 designed to create a force F which pulls the membrane 18 towards the outside of the reflector 13, that is to say towards space, when the membrane is attached to the reflector, so that the membrane forms a substantially planar surface between the first face 15 of the reflector 13 and the gap, independently of the thermal expansions of the membrane 18 and the reflector 13 occurring within a predetermined temperature range.
  • the elastic tensioners are dimensioned and arranged so as to tension the membrane like a drum skin between the first face of the reflector 15 and the space.
  • the tensioners catch up, due to their elasticity, the games due to the differential thermal expansion and contraction between the reflector and the membrane, when the temperature varies, to tension the membrane permanently.
  • This solution has the advantage of guaranteeing the voltage of the membrane in a temperature range chosen according to the conditions of use of the membrane and the reflector which makes it possible to overcome the problems of solar focusing described above. Moreover, because of the permanent tension of the membrane, the influence of the membrane on the performance of the reflection device is the same whatever the temperature. In addition, by coupling the tensioners to the membrane, it avoids unnecessarily immobilize the reflector to individually fix the tensioners on the reflector before coming to attach the membrane. The reflector is immobilized only during the operation of fixing the membrane.
  • the chosen temperature range depends on the applications. For space applications, a temperature range ranging from - 250 ° C to +350 ° C is chosen. This temperature range corresponds to the temperature range at which the protective membrane of a telecommunication antenna sent into space can be subjected to.
  • the elastic tensioners 23 are arranged at the periphery of the membrane and are fixed on the inner face 21 of the membrane.
  • the elastic tensioners 23 are attached to the membrane 18, for example, by means of an adhesive, such as, for example, glue or adhesive tape or by any other means of fixing the tensioner to the membrane.
  • Kapton R adhesive tape is advantageously used.
  • Kapton R is already used for space applications. It checks the criteria imposed for space applications. The use of this material makes it possible to get rid of all the homologation tests to which a new material is subjected in order to be able to be used for these applications.
  • the tensioners 23 are flexible blades. This is, for example Kapton blades R. PPD-T poly-para-phenylene terephthalamide slides can also be used.
  • Kevlar R The company Dupont de Nemours markets the latter material under the name of Kevlar R. This material has the advantage of maintaining its mechanical properties at extreme temperatures.
  • any material having stiffness and dimensional stability equivalent to Kapton R and verifying predetermined criteria imposed for a spatial application can be used.
  • Blades having a stiffness higher than that of the membrane are chosen.
  • blades having a stiffness of between 5 N / m and 500 N / m are chosen.
  • flexible blades have a thickness of between 0.1 mm and 2 mm.
  • Kapton blades R are advantageously chosen to have a thickness greater than that of the membrane.
  • blades having a thickness of between 10 and 20 times greater than the thickness of the membrane are chosen.
  • blades having a thickness of 0.38 mm are chosen.
  • the tensioners are arranged in relation to the first fastening means 19 of the diaphragm 18 so that the tensioners 23 rest on the reflector 13 when the diaphragm 18 is fastened to the reflector 13 by means of the fixing means 19, 20.
  • the first fastening means ensure the separation between the tensioners 23 and the edge of the membrane 18. With this arrangement, the tensioners can exert efforts F which pull the membrane outwardly of the reflector, that is to say towards the 'space.
  • tensioners 23 are flexible blades plated on the membrane, as shown in FIG. figure 2b , we organize more particularly the blades 23 so that they straddle the seam 24 between the second face 16 of the reflector 13 and the wafer 17 when the membrane 18 is fixed to the reflector and the blades 23 are dimensioned so that they are in flexion over the entire predetermined temperature range.
  • each blade 23 produces, due to its size and its arrangement, a force F which pulls the diaphragm 18 towards the outside of the reflector 13 so as to tension the membrane.
  • This force is exerted whatever the temperature to which the reflection device is subjected provided that it is in the predetermined temperature range.
  • the tensioners 23 are distributed over the periphery of the membrane 18 so that the membrane 18 forms a substantially flat surface between the space and the first face 15 when the membrane 18 is fixed to the reflector 13.
  • Obtaining a membrane 18 forming a substantially flat surface requires precise positioning of the tensioners 23 relative to the reflector.
  • the positioning accuracy is achieved in particular by judiciously arranging the tensioners 23 relative to the first fixing means 19, 20. This operation is delicate. It is made directly on the membrane before fixing it to the reflector.
  • the operation of making the first 19 and the second fastening means 20 cooperate is easy. It does not need to take special precautions to ensure accurate positioning of the membrane. Precision operations have already been performed on the membrane.
  • the blades are pressed against the membrane. Plating the blades 23 against the membrane ensures the positioning of the blades in the desired position when fixing the membrane on the reflector.
  • the tensioners are set back relative to the first face 15.
  • the membrane bears on the periphery of the active face 15.
  • the tensioners are arranged to maintain the membrane spaced apart from the first face of the reflector at any point on this face.
  • the tensioners 23 are arranged so as to exert an additional force on the membrane in the direction perpendicular to the force F towards the space so as to maintain the membrane 18 spaced from the first face 15 of the reflector 13 at any point of said first face 15.
  • the blades are arranged so that they have a border extending closer to the space than the first face 15.
  • This characteristic makes it possible to tension the membrane in a plane which is not attached to any point on the first face of the reflector, even at its periphery.
  • the arrangement of the blades so as to maintain the diaphragm 18 spaced from the first active face at any point of said active face is particularly advantageous when the transmitting equipment is a plane emitter panel, for example a planar radiating panel is plane. It ensures the spacing between the membrane and the first face of the reflector.
  • the membrane 18 comprises, on its periphery, tongues 26, one of which is referenced numerically for clarity. These tabs 26 are distributed in petals of flowers at the periphery of the membrane. In other words, the periphery of the membrane 21 has a cut into flower petals.
  • the first fastening means 19 are arranged on these tongues 26 so that when the membrane 18 is adhered to the reflector 13, they cooperate with the second fastening means 20.
  • This process is more interesting industrially than the manufacturing method of the prior art because it does not require a step of fixing the elastic tensioners to the membrane which limits the duration of the immobilization of the transmitter equipment. Moreover, the tensioners being arranged on the membrane to obtain the desired effect, the membrane fixing step is easy.
  • the invention also relates to a spacecraft, for example a satellite, comprising a telecommunication antenna, comprising a device according to the invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Remote Sensing (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Aerials With Secondary Devices (AREA)
  • Details Of Aerials (AREA)

Claims (13)

  1. Vorrichtung zum Emittieren von Funkwellen, die ein Emittergerät (13) für eine Telekommunikationsantenne (10), eine Membran (18) zum thermischen Schützen des Reflektors sowie Mittel (19, 20) zum Befestigen der Wärmeschutzmembran (18) an dem Gerät (13) umfasst, dadurch gekennzeichnet, dass die Wärmeschutzmembran (18) mit mehreren elastischen Spannern (23) versehen ist, die die Wärmeschutzmembran (18) zwischen einer ersten aktiven Fläche des Emittergerätes (13) und dem Raum gespannt halten sollen, unabhängig von den Wärmeausdehnungen der Membran (18) und des Emittergerätes (13), die in einem vorbestimmten Temperaturbereich auftreten, wenn die Befestigungsmittel (19, 20) die Membran (18) an dem Emittergerät (13) befestigen, wobei die elastischen Spanner (23) flexible Blätter mit einer Steifigkeit umfassen, die höher ist als die Steifigkeit der Membran, und die gegen die Membran plattiert und an der Membran (18) befestigt sind.
  2. Vorrichtung nach dem vorherigen Anspruch, wobei die Befestigungsmittel (19, 20) der Membran erste Befestigungsmittel (19) umfassen, die fest mit der Membran (18) verbunden sind und die Trennung zwischen den Spannern (23) und dem Rand der Membran (18) erzeugen, um einen Kontakt zwischen dem Emittergerät (13) und den Spannern (23) zu garantieren, wenn die Befestigungsmittel (19, 20) die Membran (18) an dem Emittergerät (13) befestigen.
  3. Vorrichtung nach einem der vorherigen Ansprüche, wobei die Befestigungsmittel zweite Befestigungsmittel (20) umfassen, die an einer zweiten inaktiven Fläche (16) des Emittergerätes (13) befestigt und zum Zusammenwirken mit den ersten Befestigungsmitteln (19) ausgelegt sind, um die Membran (18) an dem Emittergerät (13) zu befestigen.
  4. Vorrichtung nach einem der vorherigen Ansprüche, wobei die flexiblen Blätter eine Steifigkeit zwischen 5 N/m und 500 N/m haben.
  5. Vorrichtung nach einem der vorherigen Ansprüche, wobei die flexiblen Blätter aus Polyparaphenylenterephtalamid PPD-T oder aus Polyimid bestehen.
  6. Vorrichtung nach einem der vorherigen Ansprüche, wobei die flexiblen Blätter eine Dicke zwischen 0,1 mm und 2 mm haben.
  7. Vorrichtung nach einem der vorherigen Ansprüche, wobei die flexiblen Blätter KaptonR-Blätter mit einer Dicke sind, die 10 bis 20 Mal größer ist als die Dicke der Membran.
  8. Vorrichtung nach einem der Ansprüche 5 bis 7, wobei der vorbestimmte Temperaturbereich von -250°C bis + 400°C geht.
  9. Vorrichtung nach einem der vorherigen Ansprüche, wobei die flexiblen Blätter so ausgelegt sind, dass sie rittlings auf der Verbindung (24, 25) zwischen einer zweiten inaktiven Fläche (16) der Platte und einer Scheibe (17) sitzen, die die erste aktive Fläche (15) und die zweite inaktive Fläche (16) des Emittergerätes (13) verbindet, wenn die Befestigungsmittel (19, 20) die Membran (18) an dem Emittergerät (13) befestigen, wobei die Blätter ferner so bemessen sind, dass sie über den gesamten vorbestimmten Temperaturbereich gebogen sind.
  10. Vorrichtung nach einem der vorherigen Ansprüche, wobei die elastischen Spanner (23) so ausgelegt sind, dass sie eine zusätzliche Kraft auf die Membran in der Richtung senkrecht zu der Kraft ( F ) und in Richtung auf den Raum ausüben, um die Membran (18) von der ersten aktiven Fläche (15) des Emittergerätes (13) an jedem Punkt der ersten aktiven Fläche (15) beabstandet zu halten.
  11. Antenne, die eine Vorrichtung nach einem der vorherigen Ansprüche umfasst.
  12. Raumschiff, das eine Antenne nach dem vorherigen Anspruch umfasst.
  13. Verfahren zur Herstellung einer Vorrichtung zum Reflektieren von Funkwellen nach einem der Ansprüche 1 bis 10, das Folgendes beinhaltet:
    - einen Schritt bestehend aus dem Ausstatten der Membran (18) mit elastischen Spannern (23), die zum Halten der Membran (18) zwischen der ersten Fläche (15) des Emittergerätes und dem Raum vorgesehen sind, unabhängig von den Wärmeausdehnungen der Membran (18) und des Emittergerätes (13), die in einem vorbestimmten Temperaturbereich auftreten, wenn die Befestigungsmittel die Membran (18) an dem Emittergerät (13) befestigen, wobei die elastischen Spanner (23) flexible Blätter mit einer Steifigkeit umfassen, die größer ist als die Steifigkeit der Membran, wobei die flexiblen Blätter gegen die Membran plattiert und an der Membran (18) befestigt werden,
    - einen Schritt des Befestigens der mit elastischen Spannern (23) versehenen Membran (18) an dem Emittergerät (13).
EP11186580.4A 2010-10-29 2011-10-25 Vorrichtung zum Aussenden von Funkwellen, Antenne und Raumschiff Active EP2451007B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1004272A FR2966984B1 (fr) 2010-10-29 2010-10-29 Dispositif d'emission d'ondes radioelectriques, antenne et engin spatial.

Publications (2)

Publication Number Publication Date
EP2451007A1 EP2451007A1 (de) 2012-05-09
EP2451007B1 true EP2451007B1 (de) 2014-11-26

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EP11186580.4A Active EP2451007B1 (de) 2010-10-29 2011-10-25 Vorrichtung zum Aussenden von Funkwellen, Antenne und Raumschiff

Country Status (6)

Country Link
US (1) US8760358B2 (de)
EP (1) EP2451007B1 (de)
CN (1) CN102593607B (de)
CA (1) CA2757391C (de)
ES (1) ES2528407T3 (de)
FR (1) FR2966984B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014210086A1 (en) * 2013-06-27 2014-12-31 Andrew Llc Foldable radome
US10454161B1 (en) * 2016-03-04 2019-10-22 Raytheon Company Radome assembly
EP3220548B1 (de) * 2016-03-18 2018-12-12 Huawei Technologies Co., Ltd. Antennengehäuse mit spannungselement
US10516216B2 (en) 2018-01-12 2019-12-24 Eagle Technology, Llc Deployable reflector antenna system
US10707552B2 (en) 2018-08-21 2020-07-07 Eagle Technology, Llc Folded rib truss structure for reflector antenna with zero over stretch
CN113497360A (zh) * 2021-05-24 2021-10-12 西安空间无线电技术研究所 零透射太阳屏及星载天线反射器高精度型面控制热控结构

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Publication number Priority date Publication date Assignee Title
US3388401A (en) * 1965-06-30 1968-06-11 Andrew Antenna Company Ltd Parabolic antenna with low-loss flexible radome
US4126864A (en) * 1978-01-23 1978-11-21 Hopkins B Ice shield for micro-wave antenna
US4364053A (en) * 1980-09-18 1982-12-14 William Hotine Inflatable stressed skin microwave antenna
US4918459A (en) * 1989-02-27 1990-04-17 Teso John S De Apparatus for protecting antennas
GB2277200B (en) * 1993-04-16 1997-03-12 British Aerospace A cover for a spacecraft antenna
US5729238A (en) * 1995-09-19 1998-03-17 Walton, Jr.; William B. Hot air de-icing of satellite antenna with cover
US5729241A (en) * 1996-05-28 1998-03-17 Ergen; Charles W. Direct broadcast satellite antenna cover
US6137449A (en) * 1996-09-26 2000-10-24 Kildal; Per-Simon Reflector antenna with a self-supported feed

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Publication number Publication date
CA2757391C (fr) 2018-08-28
CA2757391A1 (fr) 2012-04-29
US20120274533A1 (en) 2012-11-01
FR2966984A1 (fr) 2012-05-04
CN102593607A (zh) 2012-07-18
CN102593607B (zh) 2016-03-30
ES2528407T3 (es) 2015-02-10
FR2966984B1 (fr) 2013-08-30
EP2451007A1 (de) 2012-05-09
US8760358B2 (en) 2014-06-24

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