EP2685560B1 - Funkantennenreflektor für hochfrequenzanwendung in einer geostationären raumumgebung - Google Patents

Funkantennenreflektor für hochfrequenzanwendung in einer geostationären raumumgebung Download PDF

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Publication number
EP2685560B1
EP2685560B1 EP13176211.4A EP13176211A EP2685560B1 EP 2685560 B1 EP2685560 B1 EP 2685560B1 EP 13176211 A EP13176211 A EP 13176211A EP 2685560 B1 EP2685560 B1 EP 2685560B1
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Prior art keywords
reflector
angle
angular
layer
sectors
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EP13176211.4A
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English (en)
French (fr)
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EP2685560A1 (de
Inventor
Florent Lebrun
Patrick Martineau
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Thales SA
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Thales SA
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    • 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
    • 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
    • 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
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • 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 [2D], e.g. paraboloidal
    • H01Q15/165—Reflecting surfaces; Equivalent structures curved in two dimensions [2D], e.g. paraboloidal composed of a plurality of rigid panels
    • 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 [2D], e.g. paraboloidal
    • H01Q15/168—Mesh reflectors mounted on a non-collapsible frame

Definitions

  • the invention is in the field of telecommunications satellites comprising passive antennas equipped with reflectors.
  • the invention is particularly intended for applications in very high frequency bands Ka and Q / V but also meets the lower technical requirements of the Ku frequency band.
  • the frequency band designated Ku corresponds to the frequencies between 12 and 18 GHz, ie a wavelength of between 2.5 and 1.6 cm.
  • the frequency band designated Ka corresponds to the frequencies between 26.5 and 40 GHz, ie a wavelength of between 11.3 and 7.5 mm.
  • the frequency band designated Q / V corresponds to frequencies between 33 and 75 GHz, ie a wavelength of between 9.1 and 3.3 mm.
  • the gains requested are less important (of the order of 40 to 50 dB), but the main constraint is on the level of space and the mass to be sent into space. Indeed, it is not possible to oversize the reflectors to improve the gain.
  • One solution is to use the concept of a Gregorian type antenna with two reflectors positioned vis-à-vis and to obtain in a small volume a larger equivalent focal length antenna.
  • a first conventional technology called “thick shell” technology is widespread. This technology is based on a structure called “sandwich”.
  • a reflector developed according to this technology comprises two membranes or skins and a spacer corresponding to a structure maintaining a relative position of the membranes and ensuring the rigidity of the "sandwich” structure thus formed.
  • the membranes are generally made of carbon reinforcement and the spacer is generally of the “honeycomb” or CFRP (Carbon Fiber Renforced Polymer) type.
  • This concept is particularly competitive for reflectors whose diameter is between 1 and 2 m, the assembly of this type of structure is however too complex and therefore too expensive for small diameter reflectors.
  • a 500 mm diameter reflector developed according to the so-called "thick shell” technology weighs 550 g. This technology does not achieve the weight goals set for applications in a space environment.
  • a second technology called "metallic" is used for the development of small diameter reflectors.
  • the reflectors are conventionally made by machining. This technology is economically interesting.
  • the mass of a 500 mm diameter main reflector comprising a Ta 6 V type alloy is about 900 g, more than twice the desired weight objectives for space applications.
  • This product is a reflector comprising a membrane on which is fixed a stiffening network.
  • the stiffening network is a reinforcing grid forming a triangular pattern called "Isogrid" disposed adjacent to the first structure, the stiffening network being fixed to the membrane by gluing.
  • a fourth technology called “monolithic technology with peripheral stiffener” overcomes the problems related to weight.
  • This technology comprises a monolithic membrane on which a peripheral stiffening ring is glued.
  • the stiffening ring is a rib comprising carbon to stiffen the reflector and thus achieve resonance frequency objectives.
  • the cold bonding of the peripheral stiffening ring on the active face of the reflector limits the range of operating temperatures.
  • the document US2007 / 0069970 discloses a parabolic antenna reflector comprising four dials, each dial consisting of a metal mesh.
  • the document FR2944154 discloses the use of a composite material for an antenna reflector, the composite material consisting of carbon fibers embedded in a cured epoxy resin.
  • An object of the invention is to develop a telecommunication antenna reflector compatible with high frequency applications and adapted for a space environment and whose development process requires little manpower.
  • an antenna reflector compatible with high frequency applications between 12 and 75 GHz and adapted for a paraboloidal or ellipsoidal geostationary space environment comprising a reflecting surface for focusing a radiation electromagnetic.
  • the reflector comprises a superposition of at least one layer comprising a fiber composite material, characterized in that at least one layer of fiber composite material comprises angular sectors arranged around a center, each of the angular sectors is defined by a first angle at the center, and is oriented in a median radial direction of the angle at the center, each of the angular sectors comprises the fiber composite material comprising first fibers oriented in a first direction and second fibers oriented in a second direction different from the first direction, the first direction of the first fibers of an angular sector forming a second angle with the radial direction of the angular segment.
  • the angular sectors comprise three concentric zones: a central zone, a peripheral zone and an intermediate zone located between the central zone and the peripheral zone, the intermediate zone forming a rim.
  • the second angle is between 0 and 60 °.
  • the rim formed at the periphery of the active surface acts as a stiffening ring directly integrated in the reflector thus avoiding the disadvantages encountered in the so-called technology "monolithic technology with peripheral stiffener” related to the production of molds and the cold bonding of the crown on the active surface.
  • the reflector thus produced makes it possible to limit the number of hours of labor required.
  • the reflector comprises at least one layer having a central portion centered on the center which facilitates the assembly of the angular sectors and prevents the overlap of the angular segments in the center of the reflector
  • a reflector as described above wherein the angular difference between the second angle of a first angular sector of a first layer and the second angle of a first sector angle of a second successive layer is constant so as to ensure mechanical continuity between consecutive sectors.
  • the angular difference is between 0 ° and 60 °.
  • the stack comprises between 2 and 10 layers, and preferably 6 layers. This value is a compromise between the weight of the reflector and the geometric quality of the reflector.
  • First sectors have an angle at the center ( ⁇ i + X) and second angular sectors have an angle at the center ( ⁇ i -X), the value of X being fixed beforehand.
  • a layer alternately comprises a first angular sector and then a second angular sector.
  • the value of X is between 2 ° and 5 °.
  • the first angular sectors of a layer cover the second angular sectors of the successive layer, so as to ensure a continuity of the mechanical strength between consecutive sectors.
  • the layers have a diameter of between 250 and 700 mm, and preferably 500 mm.
  • the woven composite material comprises a fiber material impregnated with a thermosetting resin allowing the reflector to reach operating temperatures of 165 ° C.
  • the fiber composite material comprises a fiber material impregnated with a thermoplastic resin making it possible to achieve operating temperatures greater than 200 ° C.
  • the fiber material is a fabric.
  • the fiber material is of the NCF (or non-crimp Fabric) type.
  • the figure 1a illustrates a reflector R, comprising a fiber material M of paraboloid form comprising a rim, the diameter of the reflector R being between 250 and 700 mm, and preferably 500 mm.
  • the reflector may be ellipsoid.
  • the concave surface of the layer constitutes the reflective surface of the reflector R and is oriented towards the terrestrial globe.
  • the flange acts as a stiffening ring to stiffen the structure and reach resonance frequencies of 60 Hz at a temperature of 20 ° C.
  • the figure 1b highlights the constituent elements of the reflector R.
  • the reflector R comprises a stack of at least one layer C n .
  • the stack comprises between 2 and 10 layers, the number of layer C n depends on the type of material used.
  • the required mechanical performances can be obtained by considering a superposition of six layers C1-C6.
  • the figure 2 illustrates the different constituent parts of a layer C n .
  • a layer C n comprises a central portion P C and angular sectors (S i ) n , the truncated angular sectors S i being arranged around the central portion P C.
  • the layer may comprise a center (c).
  • the layer C n comprises three concentric zones: a first central zone Zc corresponding to the active surface of the reflector, a second zone Zp peripheral and a third zone Zi intermediate, the second zone Zi intermediate forming a rim.
  • the intermediate zone Zi is of concave shape with a small radius of curvature, typically 5 mm so as to limit the effects of parasitic reflections of the electromagnetic waves towards the source of the antenna. This radius can not be reduced further because of the low capacity of carbon fabrics to follow without breaking small radii.
  • the axis of orientation of the peripheral zone Zp forms an angle y with a vertical axis passing through the centers of the central portions P C layers forming a stiffener directly integrated into the reflector structure to achieve the stiffness objectives set for high frequency telecommunications applications.
  • the figure 3 describes the arrangement and orientation of the fiber material M constituting the angular sectors (S i ) n of a layer C n .
  • the geometric stability of the reflector in hot or cold temperature is obtained in part by the use of a single composite material M for all the constituent elements of the reflector R.
  • the proposed reflector concept is compatible with a use of a material M comprising carbon fibers and a thermoplastic resin making it possible to achieve a use temperature greater than 200 ° C.
  • the angular sectors (S i ) n of a layer C n are oriented in a radial direction d R of the angular sector (S i ) n considered.
  • An angular sector (S i ) n comprises a thermoplastic fiber material M comprising first fibers f1 and second fibers f2.
  • the first fibers f1 are oriented in a first direction (d i1 ) n , i being an index corresponding to the sector considered and n being an index corresponding to the layer considered, the second fibers f2 being oriented in a direction (d i2 ) n , different from the first direction (d i1 ) n .
  • a second angle ( ⁇ i ) n is defined as the angular difference between the first direction (d i1 ) n and the radial direction d R of the angular sector.
  • the second angle ( ⁇ i ) n is between 0 ° and 180 °, in this case the second angle ( ⁇ i ) n is equal to 60 ° for all the angular sectors of the first layer C1.
  • the first fibers f1 of the woven material M are oriented in the direction d radial R of the angular sector (S i ) n considered.
  • the figure 4 represents a stack of six layers C1-C6 and the arrangement of the material M constituting the angular sectors (S i ) n of one layer (C) n to another.
  • a first layer C1 comprises angular sectors (S i ) 1 comprising a woven material M comprising first fibers f1 and second oriented fibers f2 as defined above.
  • the first fibers f1 of a first angular segment (S 1 ) 1 of the first layer (C) 1 are oriented in a first direction (d 11 ) 1 , the first direction (d 11 ) 1 forming an angle ( ⁇ 1 ) 1 with the radial direction d R of the first angular sector.
  • the angle ( ⁇ 1 ) 1 is zero, in other words, the first fibers are oriented in the radial direction d R of the first angular sector (S 1 ) 1 .
  • the first fibers f1 of a first angular sector (S 1 ) 2 of the second layer C 2 are oriented in a first direction (d 11 ) 2 , the first direction (d 11 ) 2 forming a second angle ( ⁇ 1 ) 2 with the first direction (d 11 ) 1 of the first sector (S 1 ) 1 of the first layer C 1 .
  • the second angle ⁇ is equal to 60 °.
  • the angular difference ⁇ is constant from one layer to another.
  • the first fibers f1 of the first layer C 1 are oriented in the direction d radial R of the angular sector considered
  • the first fibers f1 of the second layer C 2 are oriented in a direction forming a An angle of 60 ° with the radial direction d R
  • the first fibers of the third layer are oriented in a direction forming an angle of 120 ° with the radial direction d R.
  • the angular distance ⁇ is variable from one layer to another.
  • the figure 5a represents the arrangement of the angular sectors (S i ) n as a function of the first angles in the center ( ⁇ i ) n .
  • First sectors S A have an angle at the center ( ⁇ i + X) and second angular sectors S B have an angle at the center ( ⁇ i -X), the value of X being fixed beforehand.
  • a layer C n alternately comprises a first angular sector S A and a second angular sector S B.
  • the value of X is between 2 ° and 5 °.
  • the figure 5b represents the arrangement of the angular sectors S A and S B on a first layer C n and a second layer C n + 1 successive.
  • a first layer C n comprises first angular sectors S A with an angle in the center ( ⁇ + X) alternating with second angular sectors S B of central angle ( ⁇ -X).
  • a second successive layer C n + 1 comprises an alternation of first sectors S A and second sectors S B.
  • the angular sectors are arranged in such a way that a first angular sector S A of the layer C n covers a second angular sector S B of the successive layer C n + 1.
  • the angular sectors (S i ) n may have random angles ⁇ i at the center, the angular sectors of a first layer (C) n covering at least partially the angular sectors of a second successive layer (C) n + 1 .
  • the antenna reflector developed according to one aspect of the invention has a mass less than 20% compared to a reflector developed using a "thick shell" technology, for example. This advantage is particularly interesting for applications on antennas positioned on the earth face of satellites. In this type of configuration, the reflectors are positioned on the upper part of the satellite, they are therefore subject to significant accelerations at launch.
  • the reflector developed according to the proposed technology does not have cold bonding.

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

Claims (14)

  1. Antennenreflektor mit Paraboloid- oder Ellipsoidform (R), welcher mit Hochfrequenzanwendungen kompatibel ist, die zwischen 12 und 75 GHz liegen und für eine geostationäre Raumumgebung geeignet ist, beinhaltend eine reflektierende Seite, welche es ermöglicht, eine elektromagnetische Strahlung zu fokussieren, wobei der Reflektor (R) eine Beschichtung aus mindestens einer Schicht (Cn) beinhaltet, welche ein faseriges Verbundmaterial (M) beinhaltet,
    dadurch gekennzeichnet, dass mindestens eine Schicht (Cn) des faserigen Verbundmaterials (M) Winkelsektoren [(Si)n] beinhaltet, welche um einen Mittelpunkt (c) angeordnet sind,
    jeder der Winkelsektoren [(Si)n] durch einen ersten Winkel im Mittelpunkt [(αi)n] definiert ist, und entlang einer radialen medialen Richtung (dR) des Winkels im Mittelpunkt [(αi)n] ausgerichtet ist, erste Winkelsektoren einen Winkel im Mittelpunkt mit einem Wert von (αi+X) besitzen und zweite Winkelsektoren einen Winkel im Mittelpunkt mit einem Wert von (αi-X) besitzen, wobei ein erster Winkelsektor mit einem zweiten Winkelsektor in einer Schicht (Cn) alterniert,
    jeder der Winkelsektoren [(Si)n] das faserige Verbundmaterial (M) beinhaltet, welches erste Fasern (f1) beinhaltet, welche in eine erste Richtung [(di1)n] ausgerichtet sind und zweite Fasern (f2), welche in eine zweite Richtung [(di2)n] ausgerichtet sind, welche sich von der ersten Richtung [(di1)n] unterscheidet, wobei die erste Richtung [(di1)n] der ersten Fasern (f1) eines Winkelsektors [(Si)n] einen zweiten Winkel [(βi)n] mit der radialen Richtung (dR) des Winkelsegments [(Si)n] bilden,
    und dadurch, dass die Winkelsektoren [(Si)n] drei konzentrische Bereiche beinhalten: einen mittleren Bereich (Zc), einen umlaufenden Bereich (Zp) und einen Zwischenbereich (Zi), welcher zwischen dem mittleren Bereich (Zc) und dem umlaufenden Bereich (Zp) befindlich ist, wobei der Zwischenbereich (Zi) einen Rand bildet.
  2. Reflektor nach Anspruch 1, bei welchen der zweite Winkel [(βi)n] zwischen 0° und 60° liegt.
  3. Reflektor nach Anspruch 1 oder 2, bei welchem mindestens eine Schicht einen mittleren Teil (PC) beinhaltet, welcher auf den Mittelpunkt (C) zentriert ist.
  4. Reflektor nach einem der vorhergehenden Ansprüche, bei welchem die Winkelabweichung (θ) zwischen dem zweiten Winkel (βi)n eines ersten Winkelsegments [(Si)n] einer Schicht [(Cn] und dem zweiten Winkel [(βi)n+1] eines ersten Winkelssektors [(Si)n+1] einer darauffolgenden Schicht [(C)n+1] konstant ist.
  5. Reflektor nach einem der vorhergehenden Ansprüche, bei welchem die Schichtung zwischen 2 und 10 Schichten [(Cn)] beinhaltet.
  6. Reflektor nach Anspruch 4, bei welchem die Winkelabweichung (θ) zwischen 0° und 60° liegt.
  7. Reflektor nach Anspruch 1, bei welchem der Winkel X zwischen 2° und 5° liegt.
  8. Reflektor nach Anspruch 1, bei welchem die ersten Winkelsektoren [(SA)n] einer Schicht [(C)n] die zweiten Winkelsektoren [(SB)n] der darauffolgenden Schicht [(C)n+1] in einer Art bedecken, dass eine Kontinuität der mechanischen Festigkeit zwischen aufeinanderfolgenden Sektoren gewährleistet ist.
  9. Reflektor nach einem der vorherigen Ansprüche, bei welchem der Zwischenbereich (Zi) einen Rand mit konkaver Form bildet.
  10. Reflektor nach einem der vorherigen Ansprüche, bei welchem die Richtung des umlaufenden Bereichs (Zp) einen dritten Winkel (γ) mit einer vertikalen Achse bildet, welche durch die Mittelpunkte (c) der mittleren Bereiche (Pc) der Schichten [(C)n] passiert, wobei der dritte Winkel (γ) zwischen 0° und 30° liegt.
  11. Reflektor (R) nach einem der vorherigen Ansprüche, bei welchem der Reflektor (R) einen Durchmesser besitzt, welcher zwischen 250 und 700 mm liegt.
  12. Reflektor (R) nach einem der vorherigen Ansprüche, bei welchem das faserige Verbundmaterial (M) ein faseriges Material beinhaltet, welches mit einem wärmehärtbaren Harz imprägniert ist.
  13. Reflektor (R) nach einem der Ansprüche 1 bis 11, bei welchem das faserige Verbundmaterial (M) ein faseriges Material ist, welches mit einem thermoplastischen Harz imprägniert ist.
  14. Reflektor nach einem der Ansprüche 12 oder 3, bei welchem das faserige Material ein Gewebe ist.
EP13176211.4A 2012-07-13 2013-07-11 Funkantennenreflektor für hochfrequenzanwendung in einer geostationären raumumgebung Active EP2685560B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1201995A FR2993414B1 (fr) 2012-07-13 2012-07-13 Reflecteur d'antenne de telecommunication pour application a hautes frequences dans un environnement spatial geostationnaire

Publications (2)

Publication Number Publication Date
EP2685560A1 EP2685560A1 (de) 2014-01-15
EP2685560B1 true EP2685560B1 (de) 2019-08-21

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EP13176211.4A Active EP2685560B1 (de) 2012-07-13 2013-07-11 Funkantennenreflektor für hochfrequenzanwendung in einer geostationären raumumgebung

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US (1) US9673535B2 (de)
EP (1) EP2685560B1 (de)
ES (1) ES2753969T3 (de)
FR (1) FR2993414B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114095050B (zh) * 2020-07-29 2022-12-27 华为技术有限公司 一种无线终端
US11088461B1 (en) * 2020-10-12 2021-08-10 Custom Microwave Inc. Quad band petal reflector antenna

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2944154A1 (fr) * 2009-04-02 2010-10-08 Astrium Sas Antenne radioelectrique comportant des moyens de rigidification ameliores

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DE2460807C3 (de) * 1974-12-21 1981-04-02 Messerschmitt-Bölkow-Blohm GmbH, 8000 München Flächenhaftes Leichtbauteil aus faserverstärktem Kunststoff
US4242686A (en) * 1978-04-24 1980-12-30 General Dynamics Corporation, Pomona Division Three-dimensionally curved, knit wire electromagnetic wave reflector
US5488383A (en) * 1994-01-21 1996-01-30 Lockheed Missiles & Space Co., Inc. Method for accurizing mesh fabric reflector panels of a deployable reflector
US5686930A (en) * 1994-01-31 1997-11-11 Brydon; Louis B. Ultra lightweight thin membrane antenna reflector
US6064352A (en) 1998-04-01 2000-05-16 Trw Inc. Composite isogrid structures for parabolic surfaces
US7324057B2 (en) * 2005-09-26 2008-01-29 Gideon Argaman Low wind load parabolic dish antenna fed by crosspolarized printed dipoles
US9350083B2 (en) * 2012-03-10 2016-05-24 Harris Corporation Portable satellite communication system

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
FR2944154A1 (fr) * 2009-04-02 2010-10-08 Astrium Sas Antenne radioelectrique comportant des moyens de rigidification ameliores

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ES2753969T3 (es) 2020-04-15
FR2993414A1 (fr) 2014-01-17
EP2685560A1 (de) 2014-01-15
US20140015735A1 (en) 2014-01-16
US9673535B2 (en) 2017-06-06
FR2993414B1 (fr) 2014-08-22

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