EP2406855B1 - Reflector system for a polarisation sensitive antenna with dual linear polarisation - Google Patents

Reflector system for a polarisation sensitive antenna with dual linear polarisation Download PDF

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Publication number
EP2406855B1
EP2406855B1 EP10711326.8A EP10711326A EP2406855B1 EP 2406855 B1 EP2406855 B1 EP 2406855B1 EP 10711326 A EP10711326 A EP 10711326A EP 2406855 B1 EP2406855 B1 EP 2406855B1
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EP
European Patent Office
Prior art keywords
reflector
grid
reflector system
electrical conductors
conductors
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EP10711326.8A
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German (de)
French (fr)
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EP2406855A1 (en
Inventor
Thomas Ernst
Alexander Ihle
Norbert Nathrath
Dietmar Fasold
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HPS High Performance Space Structure Systems GmbH
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HPS High Performance Space Structure Systems GmbH
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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
    • H01Q15/22—Reflecting surfaces; Equivalent structures functioning also as polarisation filter
    • 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
    • H01Q19/18—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 having two or more spaced reflecting surfaces
    • H01Q19/19—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/195—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 having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface wherein a reflecting surface acts also as a polarisation filter or a polarising device

Definitions

  • the invention relates to a reflector system for a polarization-selective antenna with double linear polarization according to the type specified in the preamble of claim 1.
  • Reflector systems for polarization-selective antennas are well known and usually comprise two successively arranged reflective shells, of which the viewed in the direction of arrival of the electromagnetic waves front shell reflects only signals of one polarization and transmits the signals of the other polarization. This is achieved in that on the front Shell is applied a linear grid.
  • Such reflector systems for polarization-selective antennas are often used for satellites.
  • a generic reflector system of a polarization-selective antenna for a satellite is in the DE 35 36 581 A1 disclosed.
  • the reflector system comprises a viewed in the direction of incidence of the electromagnetic waves first parabolic reflector bowl, which is arranged offset over a second parabolic reflector bowl
  • the two reflector bowls are in the form of a sandwich construction of an RF-transparent, ie for high-frequency radiation permeable, formed material
  • the two reflector bowls have in each case a grating covering parallel, spaced electrical conductors, wherein the conductors of a reflector bowl are arranged perpendicular to the conductors of the other reflector bowls - each projected into the aperture plane of the antenna.
  • the conductors or the gratings formed from the conductors are embedded in the RF-transparent material of the reflector bowls.
  • the invention is therefore an object of the invention to provide a reflector system for a polarization-selective antenna with double linear polarization according to the type specified in the preamble of claim 1 on to an optimized in terms of mechanical and hydrothermal load and in terms of weight design available to deliver.
  • the reflector system for a polarization-selective antenna with double linear polarization comprises a first and second reflectors each reflecting electromagnetic waves and arranged between the two reflectors spacers over which the first reflector is spaced from the second reflector held below the first reflector
  • the front reflector viewed in the direction of incidence of the electromagnetic waves is understood.
  • the first reflector is designed as a carrierless first grid in the aperture plane of parallel, spaced-apart electrical conductors oriented in a first polarization direction.
  • Bearing materialless means that, in contrast to the prior art, the electrical conductors are not embedded in a, the reflector forming dielectric material, but that the first reflector consists exclusively of the grid formed by the conductors is advantageously by dispensing with a carrier material now a , lightweight construction allows. Another advantage is that due to the elimination of the carrier material, the problem of different heat and moisture expansion coefficients not occurs, ie that also in terms of dimensional stability an optimized design is provided. Due to the lower mass already mentioned is the reflector system according to the invention In addition, less prone to the vibrations occurring during the starting phase or vibrations.
  • the reflectors are in the form of a paraboloid. Also in the basic form parabolic reflectors with local deformations can occur.
  • the spacer between the first and second reflector is formed as a comprehensive the two reflectors on its circumference peripheral ring.
  • the formation of the spacer exclusively in the form of a peripheral ring proves to be advantageous, as this unnecessary stray bodies are avoided in the beam path of the antenna.
  • the electrical conductors of the first grid are each fastened with their ends to the spacer formed as a peripheral ring, in particular glued by the attachment of the ends of the conductors on the peripheral ring is in a simple manner, a shape of the grid, for example in the form of a paraboloid, allows.
  • the attachment by means of a bond has the effect that a simple, cost-effective production is guaranteed.
  • the second reflector is formed over its entire surface, in particular in the form of a sandwich construction, and has a surface which reflects the electromagnetic waves irrespective of polarity.
  • the second reflector is again full surface, z. B. again in the form of a sandwich construction, formed
  • the second reflector on a second grid of parallel, spaced electrical conductors, which are aligned orthogonally with respect to the first grid.
  • the conductors or the second grid are or is embedded in a known manner in the material of the second reflector
  • the second reflector corresponding to the first reflector is also formed in the form of a carrier-material second grating with parallel spaced electrical conductors, wherein the conductors of the second grating are aligned orthogonally with respect to the first grid.
  • This embodiment proves to be particularly advantageous because a particularly weight-optimized construction is made possible due to the now carrier material-less training of both reflectors.
  • the ends of the electrical conductors of the second, carrier-less grid are attached to the peripheral ring.
  • the attachment is preferably in turn formed in the form of a bond
  • the conductors of the first grid or the conductors of the first and second grid have at least one perpendicular to the conductors of the grid aligned transverse rib ,
  • the electrical conductors of the grid or the grid are formed as carbon fiber reinforced plastics.
  • the electrical conductors of the grid or the grid and the at least one transverse rib are formed as carbon fiber reinforced plastics.
  • the use of the same material for conductor and transverse rib has the advantage that the transverse rib and conductor have the same coefficient of thermal expansion, i. that no thermal stresses occur.
  • the electrical conductors of the grid are formed as carbon fiber reinforced plastics, while the at least one transverse rib of the grid is formed of a UV resistant, moisture insensitive dielectric material.
  • the electrical conductors are arranged at a distance of 1.7 to 2 mm from each other and have a diameter of 0.5 to 0.6 mm.
  • the wire-shaped transverse ribs have a diameter of 0.5 to 1.00 mm. Only for the sake of completeness, it is pointed out that the above dimensions are not to be understood as limitations and only describe an embodiment intended for a specific frequency range (Ka band). It would also be conceivable, for example, a use for Ku-band. For the Head or cross rib would then give the following dimensions: distance of the conductor 2.5 to 3 mm, diameter of the conductor about 1 mm, diameter of the transverse rib 1 to 2mm.
  • Fig. 1 shows in a sectional view, more or less schematically, a generally designated by the reference numeral 10 reflector system for a polarization-selective antenna with double linear polarization.
  • the reflector system 10 essentially comprises a first reflector 12, a second reflector 14 and a spacer 16 arranged between the first reflector 12 and the second reflector 14 in the form of a peripheral ring.
  • a representation of the horns for irradiating the reflectors 12, 14 with electromagnetic Waves or to receive the reflected electromagnetic waves from the reflectors 12, 14 has been omitted here for reasons of clarity.
  • the second reflector 14 arranged behind the first reflector 12 and viewed in the direction of incidence of the electromagnetic waves also has a fastening element 18, via which the reflector system 10 can be connected to the structure of a satellite, also not illustrated here for reasons of clarity.
  • the two reflectors 12, 14 are in the form of a paraboloid. While the second reflector 14 is formed in a known manner in the form of a sandwich construction is, as in particular from Fig. 2 it can be seen, the first reflector 12 as a support materialless grid 20 of parallel, spaced in a first polarization direction oriented electrical conductor 22 (see. Fig. 4 ) educated.
  • the grid 20 has five wire-shaped transverse ribs 24 arranged perpendicular to the conductors 22.
  • the mutually parallel electrical conductors 22 at a distance of 1.7 to 2 mm from each other.
  • the diameter of the electrical conductors is between 0.5 and 0.6 mm.
  • the wire-shaped transverse ribs have a diameter of 0.5 to 1.0 mm.
  • the electrical conductors 22 and the wire-shaped transverse ribs are made of the same material, namely formed as a carbon fiber reinforced plastic (CFRP)
  • the spacer 16 is only in contact with the outer edge of the two reflectors 12,14
  • the conductors 22 of the grid 20 are held in corresponding grooves in the spacer 16 spaced, in particular by means of an adhesive connection, see. Fig. 4 ,
  • the inventive design of the reflector system 10 namely in particular the formation of the first reflector 12 in the form of a carrier materialless grid 20 parallel, spaced oriented in a first polarization direction electrical conductor 22, a weight-optimized construction is possible. Further advantages are due to the lower system mass caused improved properties in terms of the vibration behavior at the launch of the launcher.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)

Description

Die Erfindung betrifft ein Reflektorsystem für eine polarisationsselektive Antenne mit doppelt linearer Polarisation gemäß der im Oberbegriff des Anspruches 1 angegebenen Art.The invention relates to a reflector system for a polarization-selective antenna with double linear polarization according to the type specified in the preamble of claim 1.

Reflektorsysteme für polarisationsselektive Antennen sind hinreichend bekannt und umfassen in der Regel zwei hintereinander angeordnete reflektierende Schalen, von denen die in Einfallsrichtung der elektromagnetischen Wellen gesehene vordere Schale nur Signale einer Polarisation reflektiert und die Signale der anderen Polarisation transmittiert Dies wird dadurch erreicht, dass auf der vorderen Schale ein lineares Gitter aufgebracht ist. Derartige Reflektorsysteme für polarisationsselektive Antennen werden häufig für Satelliten verwendet.Reflector systems for polarization-selective antennas are well known and usually comprise two successively arranged reflective shells, of which the viewed in the direction of arrival of the electromagnetic waves front shell reflects only signals of one polarization and transmits the signals of the other polarization. This is achieved in that on the front Shell is applied a linear grid. Such reflector systems for polarization-selective antennas are often used for satellites.

Ein gattungsgemäßes Reflektorsystem einer polarisationsselektiven Antenne für einen Satelliten ist in der DE 35 36 581 A1 offenbart. Das Reflektorsystem umfasst eine in Einfallsrichtung der elektromagnetischen Wellen gesehene erste parabolische Reflektorschüssel, die versetzt über einer zweiten parabolischen Reflektorschüssel angeordnet ist Die beiden Reflektorschüsseln sind in Form einer Sandwich-Konstruktion aus einem HF-transparenten, d.h. für Hochfrequenzstrahlung durchlässigen, Material ausgebildet Die beiden Reflektorschüsseln weisen jeweils ein Gitterbelag paralleler, beabstandeter elektrischer Leiter auf, wobei die Leiter der einen Reflektorschüssel senkrecht zu den Leitern der anderen Reflektorschüsseln angeordnet sind - jeweils projiziert in die Aperturebene der Antenne. Die Leiter bzw. die aus den Leitern gebildeten Gitter sind dabei in das HF-transparente Material der Reflektorschüsseln eingebettet.A generic reflector system of a polarization-selective antenna for a satellite is in the DE 35 36 581 A1 disclosed. The reflector system comprises a viewed in the direction of incidence of the electromagnetic waves first parabolic reflector bowl, which is arranged offset over a second parabolic reflector bowl The two reflector bowls are in the form of a sandwich construction of an RF-transparent, ie for high-frequency radiation permeable, formed material The two reflector bowls have in each case a grating covering parallel, spaced electrical conductors, wherein the conductors of a reflector bowl are arranged perpendicular to the conductors of the other reflector bowls - each projected into the aperture plane of the antenna. The conductors or the gratings formed from the conductors are embedded in the RF-transparent material of the reflector bowls.

Aufgrund des Einsatzes der Reflektorsysteme für Satellitenantennen sind diese in mehrerer Hinsicht extremen Beanspruchungen ausgesetzt: Beim Start der Trägerrakete insbesondere den durch die vom Raketentriebwerk erzeugten Vibrationen sowie nach Aussetzen des Satelliten in seiner Umlaufbahn Wärmespannungen aufgrund der Temperaturdifferenz und verschiedener Wärmedehnungskoeffizienten verschiedener Werkstoffe. Analog führt die Dehydrierung im Vakuum, speziell bei den üblicherweise zum Einsatz kommenden HF-transparenten Werkstoffen wie z.B. Kevlar/Aramid, zu unerwünschten Schrumpfungen bzw. Formänderungen im Orbit. Im Gegensatz zu Kohlenstofffasern gehören Aramidfasern zu den UV-empfindlichen Werkstoffen und erfordern daher ein zusätzliches Sonnenschutzschild, was zum einen zur Degradation der HF-Leistung und zum anderen zur Erhöhung der Gesamtmasse des Systems führt. Eine gewichtsoptimierte Ausbildung des Systems ist jedoch aufgrund der hohen Transportkosten von herausragender Bedeutung.Due to the use of reflector systems for satellite antennas, they are exposed to extreme stresses in several respects: at the start of the launcher, in particular the vibrations generated by the rocket engine and after exposure of the satellite in its orbit thermal stresses due to the temperature difference and different thermal expansion coefficients different materials. Analogously, the dehydrogenation in vacuum, especially in the commonly used HF-transparent materials such as Kevlar / aramid, leads to undesirable shrinkage or shape changes in orbit. Unlike carbon fibers, aramid fibers are UV-sensitive materials and therefore require an additional sunshield, which in turn leads to degradation in RF performance and increases the overall mass of the system. However, a weight-optimized design of the system is of paramount importance due to the high transport costs.

Ein gattungsgemäßes, sämtliche Merkmale des Oberbegriffs des Patentanspruches 1 aufweisendes Reflektorsystem für eine polaristionsselektive Antenne ist in der WO 2002/061882 A1 offenbartA generic, all features of the preamble of claim 1 exhibiting reflector system for a polaristionsselektive antenna is in the WO 2002/061882 A1 disclosed

Der Erfindung liegt daher die Aufgabe zugrunde, ein Reflektorsystem für eine polarisationsselektive Antenne mit doppelt linearer Polarisation gemäß der im Oberbegriff des Anspruches 1 angegebenen Art weiter zu bilden, um eine in Bezug auf mechanische und hydrothermische Belastung sowie in Hinblick auf das Gewicht optimierte Gestaltung zur Verfügung zu stellen.The invention is therefore an object of the invention to provide a reflector system for a polarization-selective antenna with double linear polarization according to the type specified in the preamble of claim 1 on to an optimized in terms of mechanical and hydrothermal load and in terms of weight design available to deliver.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruches 1 in Verbindung mit seinen Oberbegriffsmerkmalen gelöstThis object is solved by the characterizing features of claim 1 in conjunction with its preamble features

Die Unteransprüche bilden vorteilhafte Weiterbildungen der Erfindung.The dependent claims form advantageous developments of the invention.

In bekannter Art und Weise umfasst das Reflektorsystem für eine polarisationsselektive Antenne mit doppelt linearer Polarisation einen ersten und zweiten, jeweils elektromagnetische Wellen reflektierenden Reflektor sowie einen zwischen den beiden Reflektoren angeordneten Abstandhalter, über den der erste Reflektor beabstandet zum zweiten Reflektor gehalten ist Unter dem ersten Reflektor wird vorliegend der in Einfallsrichtung der elektromagnetischen Wellen betrachtet vordere Reflektor verstanden. Erfindungsgemäß ist der erste Reflektor als ein trägermaterialloses erstes Gitter in der Aperturebene paralleler, beabstandeter in einer ersten Polarisationsrichtung orientierter elektrischer Leiter ausgebildet. Trägermateriallos bedeutet dass im Gegensatz zum Stand der Technik die elektrischen Leiter nicht in einem, den Reflektor bildenden dielektrischem Material eingebettet sind, sondern dass der erste Reflektor ausschließlich aus dem durch die Leiter gebildeten Gitter besteht In vorteilhafter Weise ist durch den Verzicht auf ein Trägermaterial nunmehr eine, ein geringes Gewicht aufweisende Konstruktion ermöglicht. Ein weiterer Vorteil ist, dass aufgrund des Wegfalls des Trägermaterials das Problem unterschiedlicher Wärme- und Feuchteausdehnungskoeffizienten nicht auftritt, d.h. dass auch im Hinblick auf Formhaltigkeit eine optimierte Konstruktion zur Verfügung gestellt ist. Aufgrund der bereits erwähnten geringeren Masse ist das erfindungsgemäße Reflektorsystem zudem weniger anfällig gegenüber der während der Startphase auftretenden Schwingungen bzw. Vibrationen.In a known manner, the reflector system for a polarization-selective antenna with double linear polarization comprises a first and second reflectors each reflecting electromagnetic waves and arranged between the two reflectors spacers over which the first reflector is spaced from the second reflector held below the first reflector In the present case, the front reflector viewed in the direction of incidence of the electromagnetic waves is understood. According to the invention, the first reflector is designed as a carrierless first grid in the aperture plane of parallel, spaced-apart electrical conductors oriented in a first polarization direction. Bearing materialless means that, in contrast to the prior art, the electrical conductors are not embedded in a, the reflector forming dielectric material, but that the first reflector consists exclusively of the grid formed by the conductors is advantageously by dispensing with a carrier material now a , lightweight construction allows. Another advantage is that due to the elimination of the carrier material, the problem of different heat and moisture expansion coefficients not occurs, ie that also in terms of dimensional stability an optimized design is provided. Due to the lower mass already mentioned is the reflector system according to the invention In addition, less prone to the vibrations occurring during the starting phase or vibrations.

Vorzugsweise - aber nicht ausschließlich - sind die Reflektoren in Form eines Paraboloids ausgebildet. Auch in der Grundform parabolische Reflektoren mit lokalen Verformungen können vorkommen.Preferably, but not exclusively, the reflectors are in the form of a paraboloid. Also in the basic form parabolic reflectors with local deformations can occur.

Gemäß einer vorteilhaften Weiterbildung der Erfindung ist der Abstandhalter zwischen dem ersten und zweiten Reflektor als ein die beiden Reflektoren an ihrem Umfang umfassenden Umfangsring ausgebildet. Die Ausbildung des Abstandshalter ausschließlich in Form eines Umfangsring erweist sich als vorteilhaft, da hierdurch unnötige Streukörper im Strahlengang der Antenne vermieden werden.According to an advantageous embodiment of the invention, the spacer between the first and second reflector is formed as a comprehensive the two reflectors on its circumference peripheral ring. The formation of the spacer exclusively in the form of a peripheral ring proves to be advantageous, as this unnecessary stray bodies are avoided in the beam path of the antenna.

Vorzugsweise sind die elektrischen Leiter des ersten Gitters mit ihren Enden jeweils an dem als Umfangsring ausgebildeten Abstandshalter befestigt, insbesondere verklebt Durch die Befestigung der Enden der Leiter an dem Umfangsring ist auf eine einfache Art und Weise eine Formgebung des Gitters, beispielsweise in Form eines Paraboloids, ermöglicht. Die Befestigung mittels einer Verklebung hat den Effekt, dass eine einfache, kostengünstige Fertigung gewährleistet ist.Preferably, the electrical conductors of the first grid are each fastened with their ends to the spacer formed as a peripheral ring, in particular glued by the attachment of the ends of the conductors on the peripheral ring is in a simple manner, a shape of the grid, for example in the form of a paraboloid, allows. The attachment by means of a bond has the effect that a simple, cost-effective production is guaranteed.

Gemäß einer ersten Ausführungsform ist der zweite Reflektor vollflächig, insbesondere in Form einer Sandwich-Konstruktion, ausgebildet und weist eine die elektromagnetische Wellen polaristionsunabhängig reflektierende Oberfläche auf.According to a first embodiment, the second reflector is formed over its entire surface, in particular in the form of a sandwich construction, and has a surface which reflects the electromagnetic waves irrespective of polarity.

Gemäß einer zweiten Ausführungsform der Erfindung ist der zweite Reflektor wiederum vollflächig, z. B. wieder in Form einer Sandwich-Konstruktion, ausgebildet Im Gegensatz zu ersten Ausführungsform weist bei dieser Ausführungsform der zweite Reflektor ein zweites Gitter paralleler, beabstandeter elektrischer Leiter auf, die im Bezug zum ersten Gitter orthogonal ausgerichtet sind. Die Leiter bzw. das zweite Gitter sind bzw. ist in bekannter Art und Weise in das Material des zweiten Reflektors eingebettetAccording to a second embodiment of the invention, the second reflector is again full surface, z. B. again in the form of a sandwich construction, formed In contrast to the first embodiment, in this embodiment, the second reflector on a second grid of parallel, spaced electrical conductors, which are aligned orthogonally with respect to the first grid. The conductors or the second grid are or is embedded in a known manner in the material of the second reflector

Gemäß einer dritten Ausführungsform ist der zweite Reflektor entsprechend zu dem ersten Reflektor ebenfalls in Form eines trägermaterialosen zweiten Gitters mit parallel beabstandeten elektrischen Leitern ausgebildet, wobei die Leiter des zweiten Gitters im Bezug zum ersten Gitter orthogonal ausgerichtet sind. Diese Ausführungsform erweist sich als besonders vorteilhaft, da aufgrund der nunmehr trägermateriallosen Ausbildung beider Reflektoren eine besonders gewichtsoptimierte Konstruktion ermöglicht ist.According to a third embodiment, the second reflector corresponding to the first reflector is also formed in the form of a carrier-material second grating with parallel spaced electrical conductors, wherein the conductors of the second grating are aligned orthogonally with respect to the first grid. This embodiment proves to be particularly advantageous because a particularly weight-optimized construction is made possible due to the now carrier material-less training of both reflectors.

Um eine einfache Formgebung des zweiten Gitters bzw. des zweiten Reflektor zu gewährleisten, sind wiederum die Enden der elektrischen Leiter des zweiten, trägermateriallosen Gitters an dem Umfangsring befestigt. Die Befestigung ist vorzugsweise wiederum in Form einer Verklebung ausgebildetIn order to ensure a simple shaping of the second grid or of the second reflector, in turn, the ends of the electrical conductors of the second, carrier-less grid are attached to the peripheral ring. The attachment is preferably in turn formed in the form of a bond

Zur Sicherstellung einer ausreichenden Stabilisierung des ersten Gitters bzw. des ersten und des zweiten Gitters, insbesondere in der Startphase der Trägerrakete, weisen die Leiter des ersten Gitters bzw. die Leiter des ersten und zweiten Gitters mindestens eine senkrecht zu den Leitern des Gitters ausgerichtete Querrippe auf.To ensure sufficient stabilization of the first grid or of the first and of the second grid, in particular in the starting phase of the carrier rocket, the conductors of the first grid or the conductors of the first and second grid have at least one perpendicular to the conductors of the grid aligned transverse rib ,

Um eine ausreichende Verbindung zwischen Querrippe und den Leitern sicher zu stellen, sind diese in vorteilhafter Weise miteinander verklebt.In order to ensure a sufficient connection between the transverse rib and the conductors, they are glued together in an advantageous manner.

Vorzugsweise sind die elektrischen Leiter des Gitters bzw. der Gitter als kohlenstofffaserverstärkte Kunststoffe ausgebildet.Preferably, the electrical conductors of the grid or the grid are formed as carbon fiber reinforced plastics.

Gemäß einer Ausführungsform sind dabei die elektrischen Leiter des Gitters bzw. der Gitter und die mindestens eine Querrippe als kohlenstofffaserverstärkter Kunststoffe ausgebildet. Die Verwendung des gleichen Materials für Leiter und Querrippe hat den Vorteil, dass Querrippe und Leiter den gleichen Wärmeausdehnungskoeffizienten aufweisen, d.h. dass keine Wärmespannungen auftreten.According to one embodiment, the electrical conductors of the grid or the grid and the at least one transverse rib are formed as carbon fiber reinforced plastics. The use of the same material for conductor and transverse rib has the advantage that the transverse rib and conductor have the same coefficient of thermal expansion, i. that no thermal stresses occur.

Gemäß einer anderen Ausführungsform sind die elektrischen Leiter des Gitters bzw. der Gitter als kohlenstofffaserverstärkter Kunststoffe ausgebildet, während die mindestens eine Querrippe des Gitters bzw. der Gitter aus einem UV-beständigen, feuchteunempfindlichen dielektrischen Material ausgebildet ist.According to another embodiment, the electrical conductors of the grid are formed as carbon fiber reinforced plastics, while the at least one transverse rib of the grid is formed of a UV resistant, moisture insensitive dielectric material.

Gemäß einer Ausführungsform der Erfindung sind die elektrischen Leiter in einem Abstand von 1,7 bis 2 mm zueinander angeordnet und weisen einen Durchmesser von 0,5 bis 0,6 mm auf. Die drahtförmig ausgebildeten Querrippen weisen einen Durchmesser von 0,5 bis 1,00 mm auf. Lediglich der Vollständigkeit halber wird darauf hingewiesen, dass obige Dimensionierungen nicht als Einschränkung zu verstehen sind und lediglich eine für einen speziellen Frequenzbereich (Ka-Band) vorgesehene Ausführungsform beschreiben. Denkbar wäre beispielsweise auch ein Einsatz für Ku-Band. Für die Leiter bzw. Querrippe würden sich dann folgende Dimensionen ergeben: Abstand der Leiter 2,5 bis 3 mm, Durchmesser der Leiter ca. 1 mm, Durchmesser Querrippe 1 bis 2mm.According to one embodiment of the invention, the electrical conductors are arranged at a distance of 1.7 to 2 mm from each other and have a diameter of 0.5 to 0.6 mm. The wire-shaped transverse ribs have a diameter of 0.5 to 1.00 mm. Only for the sake of completeness, it is pointed out that the above dimensions are not to be understood as limitations and only describe an embodiment intended for a specific frequency range (Ka band). It would also be conceivable, for example, a use for Ku-band. For the Head or cross rib would then give the following dimensions: distance of the conductor 2.5 to 3 mm, diameter of the conductor about 1 mm, diameter of the transverse rib 1 to 2mm.

Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung in Verbindung mit dem in der Zeichnung dargestellten Ausführungsbeispiel.Further advantages, features and possible applications of the present invention will become apparent from the following description in conjunction with the embodiment shown in the drawing.

Die Erfindung wird im Folgenden anhand des in der Zeichnung dargestellten Ausführungsbeispiels beschrieben. In der Beschreibung, in den Ansprüchen, in der Zusammenfassung und in der Zeichnung werden die in der unten aufgeführten Liste der Bezugszeichen verwendete Begriffe und zugeordnete Bezugszeichen verwendet. In der Zeichnung bedeutet:

Fig. 1
Eine Schnittdarstellung des efindungsgemäßen Reflektorsystem für eine polarisationsselektive Antenne mit doppelt linearer Polarisation;
Fig. 2
eine Draufsicht auf den ersten Reflektor des erfindungsgemäßen Reflektorsystem aus Fig. 1;
Fig. 3
eine vergrößerte Darstellung der in Fig. 1 mit E1 bezeichneten Einzelheit, und
Fig. 4
eine vergrößerte Darstellung der in Fig. 3 mit E2 bezeichneten Einzelheit
The invention will be described below with reference to the embodiment shown in the drawing. In the description, in the claims, in the abstract and in the drawing, the terms and associated reference numerals used in the list of reference numerals below are used. In the drawing:
Fig. 1
A sectional view of the efindungsgemäßen reflector system for a polarization-selective antenna with double linear polarization;
Fig. 2
a plan view of the first reflector of the reflector system of the invention Fig. 1 ;
Fig. 3
an enlarged view of in Fig. 1 with E 1 designated detail, and
Fig. 4
an enlarged view of in Fig. 3 with E 2 designated detail

Fig. 1 zeigt in einer Schnittdarstellung mehr oder minder schematisch, ein insgesamt mit der Bezugsziffer 10 bezeichnetes Reflektorsystem für eine polarisationsselektive Antenne mit doppelt linearer Polarisation. Fig. 1 shows in a sectional view, more or less schematically, a generally designated by the reference numeral 10 reflector system for a polarization-selective antenna with double linear polarization.

Das Reflektorsystem 10 umfasst im Wesentlichen einen ersten Reflektor 12, einen zweiten Reflektor 14 sowie einen zwischen dem ersten Reflektor 12 und zweiten Reflektor 14 angeordneten, in Form eines Umfangsring ausgebildeten Abstandshalter 16. Auf eine Darstellung der Hornstrahler zum Bestrahlen der Reflektoren 12, 14 mit elektromagnetischen Wellen bzw. zum Empfang der von den Reflektoren 12, 14 reflektierten elektromagnetischen Wellen, wurde vorliegend aus Gründen der Übersichtlichkeit verzichtet.The reflector system 10 essentially comprises a first reflector 12, a second reflector 14 and a spacer 16 arranged between the first reflector 12 and the second reflector 14 in the form of a peripheral ring. On a representation of the horns for irradiating the reflectors 12, 14 with electromagnetic Waves or to receive the reflected electromagnetic waves from the reflectors 12, 14 has been omitted here for reasons of clarity.

Der in Einfallsrichtung der elektromagnetische Wellen betrachtete hinter dem ersten Reflektor 12 angeordnete zweite Reflektor 14 weist zudem ein Befestigungselement 18 auf, über den das Reflektorsystem 10 mit der Struktur eines, hier ebenfalls aus Gründen der Übersichtlichkeit nicht dargestellten, Satelliten verbindbar ist.The second reflector 14 arranged behind the first reflector 12 and viewed in the direction of incidence of the electromagnetic waves also has a fastening element 18, via which the reflector system 10 can be connected to the structure of a satellite, also not illustrated here for reasons of clarity.

Die beiden Reflektoren 12,14 sind in Form eines Paraboloids ausgebildet. Während der zweite Reflektor 14 in bekannter Art und Weise in Form einer Sandwich-Konstruktion ausgebildet ist, ist wie insbesondere aus Fig. 2 ersichtlich, der erste Reflektor 12 als ein trägermaterialloses Gitter 20 paralleler, beabstandeter in einer ersten Polarisationsrichtung orientierter elektrischer Leiter 22 (vgl. Fig. 4) ausgebildet. Zur Stabilisierung weist das Gitter 20 fünf senkrecht zu den Leitern 22 angeordnete, drahtförmig ausgebildete Querrippen 24 auf. Gemäß dem dargestellten Ausführungsbeispiel weisen die parallel zueinander angeordneten elektrischen Leiter 22 einen Abstand von 1,7 bis 2 mm zueinander auf. Der Durchmesser der elektrischen Leiter beträgt zwischen 0,5 und 0,6 mm. Die drahtförmig ausgebildeten Querrippen weisen einen Durchmesser von 0,5 bis 1,0 mm auf.The two reflectors 12, 14 are in the form of a paraboloid. While the second reflector 14 is formed in a known manner in the form of a sandwich construction is, as in particular from Fig. 2 it can be seen, the first reflector 12 as a support materialless grid 20 of parallel, spaced in a first polarization direction oriented electrical conductor 22 (see. Fig. 4 ) educated. For stabilization, the grid 20 has five wire-shaped transverse ribs 24 arranged perpendicular to the conductors 22. According to the illustrated embodiment, the mutually parallel electrical conductors 22 at a distance of 1.7 to 2 mm from each other. The diameter of the electrical conductors is between 0.5 and 0.6 mm. The wire-shaped transverse ribs have a diameter of 0.5 to 1.0 mm.

Die elektrischen Leiter 22 und die drahtförmigen Querrippen sind materialgleich, nämlich als ein kohlenstofffaserverstärkter Kunststoff (CFRP) ausgebildetThe electrical conductors 22 and the wire-shaped transverse ribs are made of the same material, namely formed as a carbon fiber reinforced plastic (CFRP)

Wie insbesondere aus Fig. 3 ersichtlich ist, steht der Abstandshalter 16 lediglich mit dem äußeren Rand der beiden Reflektoren 12,14 in Kontakt Hierbei sind die Leiter 22 des Gitters 20 in entsprechende Nuten im Abstandshalter 16 beabstandet gehalten, insbesondere mittels einer Klebeverbindung, vgl. Fig. 4.As in particular from Fig. 3 it can be seen, the spacer 16 is only in contact with the outer edge of the two reflectors 12,14 Here, the conductors 22 of the grid 20 are held in corresponding grooves in the spacer 16 spaced, in particular by means of an adhesive connection, see. Fig. 4 ,

Durch die erfindungsgemäße Ausbildung des Reflektorsystems 10, nämlich insbesondere der Ausbildung des ersten Reflektors 12 in Form eines trägermateriallosen Gitters 20 paralleler, beabstandeter in einer ersten Polarisationsrichtung orientierter elektrischer Leiter 22, ist eine gewichtsoptimierte Konstruktion ermöglicht. Weitere Vorteile sind die, aufgrund der geringeren Systemmasse bedingten verbesserten Eigenschaften hinsichtlich des Schwingungsverhalten beim Start der Trägerrakete.Due to the inventive design of the reflector system 10, namely in particular the formation of the first reflector 12 in the form of a carrier materialless grid 20 parallel, spaced oriented in a first polarization direction electrical conductor 22, a weight-optimized construction is possible. Further advantages are due to the lower system mass caused improved properties in terms of the vibration behavior at the launch of the launcher.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Reflektorsystemreflector system
1212
erster Reflektorfirst reflector
1414
zweiter Reflektorsecond reflector
1616
Abstandshalterspacer
1818
Befestigungselementfastener
2020
Gittergrid
2222
elektrische Leiterelectrical conductors
2424
Querrippentransverse ribs

Claims (17)

  1. Reflector system for a polarization-sensitive antenna with dual linear polarization, which system comprises:
    a first reflector (12) which reflects electromagnetic waves;
    a second reflector (14) which reflects electromagnetic waves, and
    a spacer (16) which is used to keep the first reflector (12) spaced from the second reflector (14), which spacer (16) is designed as a peripheral ring which surrounds the two reflectors (12, 14) at their periphery,
    characterized in that
    the first reflector (12) is designed as a first grid (20) that does not comprise any carrier material and consists of parallel wire-shaped electrical conductors (22) that are spaced from one another and are aligned in a first polarization direction, and that
    the wire-shaped electrical conductors (22) of said first grid (20) have their respective ends kept spaced apart by the spacer (16) designed in the form of a peripheral ring.
  2. Reflector system according to claim 1, characterized in that the reflectors (12, 14) are designed in the form of a paraboloid.
  3. Reflector system according to claim 1, characterized in that the reflectors (12, 14) are designed in the form of a shaped reflector.
  4. Reflector system according to any one of the preceding claims, characterized in that the second reflector (14) is a full-surface structure and includes a surface which reflects the electromagnetic waves in a manner that is independent of polarization.
  5. Reflector system according to one of claims 1 through 3, characterized in that the second reflector (14) is a full-surface structure and includes a second grid of parallel wire-shaped electrical conductors that are spaced from one another and are aligned orthogonally relative to the first grid (20).
  6. Reflector system according to one of claims 4 and 5, characterized in that the second reflector (14) is of a sandwich structure.
  7. Reflector system according to one of claims 1 through 3, characterized in that the second reflector (14) is in the form of a second grid which does not comprise any carrier material and which- projected into the aperture plane - has parallel spaced wire-shaped electrical conductors, in which the conductors of the second grid are orthogonally aligned in the aperture plane relative to the conductors (22) of the first grid (20).
  8. Reflector system according to claim 7, characterized in that the wire-shaped electrical conductors of the second grid have their respective ends kept spaced apart by the spacer (16) designed in the form of a peripheral ring (16).
  9. Reflector system according to any one of the preceding claims, characterized in that the one or plural grid(s) include(s) at least one transverse rib (24) which is aligned perpendicular to the conductors of said grid(s).
  10. Reflector system according to claim 9, characterized in that if plural transverse ribs are provided, the ribs are not equidistantly spaced from one another.
  11. Reflector system according to one of claims 9 and 10, characterized in that the electrical conductors of the one or plural grid(s) and the at least one transverse rib (24) are connected to each other by bonding.
  12. Reflector system according to any one of the preceding claims, characterized in that the electrical conductors of the one or plural grid(s) are formed from carbon fiber reinforced plastics (CFRP).
  13. Reflector system according to any one of claims 1 through 12, characterized in that the electrical conductors of the one or plural grid(s) and the at least one transverse rib (24) of said one or plural grid(s) are formed from carbon fiber reinforced plastics (CFRP).
  14. Reflector system according to any one of claims 1 through 12, characterized in that the electrical conductors of the one or plural grid(s) are formed from carbon fiber reinforced plastics (CFRP) and the at least one transverse rib of the one or plural grid(s) is formed from a UV-resistant moisture-proof dielectric material.
  15. Reflector system according to any one of the preceding claims, characterized in that the electrical conductors (22) are between 0.5 mm and 0.6 mm in diameter.
  16. Reflector system according to any one of the preceding claims, characterized in that the transverse rib (24) is in the form of a wire and is between 0.5 mm and 1.0 mm in diameter.
  17. Reflector system according to any one of the preceding claims, characterized in that the electrical conductors (22) running parallel to one another are spaced between 1.7 mm and 2.0 mm apart from each other.
EP10711326.8A 2009-03-13 2010-03-05 Reflector system for a polarisation sensitive antenna with dual linear polarisation Active EP2406855B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200920003501 DE202009003501U1 (en) 2009-03-13 2009-03-13 Reflector system for a polarization-selective antenna with double linear polarization
PCT/EP2010/001399 WO2010102764A1 (en) 2009-03-13 2010-03-05 Reflector system for a polarization-selective antenna having double linear polarization

Publications (2)

Publication Number Publication Date
EP2406855A1 EP2406855A1 (en) 2012-01-18
EP2406855B1 true EP2406855B1 (en) 2017-08-30

Family

ID=40690610

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10711326.8A Active EP2406855B1 (en) 2009-03-13 2010-03-05 Reflector system for a polarisation sensitive antenna with dual linear polarisation

Country Status (3)

Country Link
EP (1) EP2406855B1 (en)
DE (1) DE202009003501U1 (en)
WO (1) WO2010102764A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3178713A (en) * 1961-03-08 1965-04-13 Andrew Corp Parabolic antenna formed of curved spaced rods
US4625214A (en) 1984-10-15 1986-11-25 Rca Corporation Dual gridded reflector structure
US4647938A (en) * 1984-10-29 1987-03-03 Agence Spatiale Europeenne Double grid reflector antenna
FR2664750B1 (en) * 1990-07-11 1993-01-29 Aerospatiale GRILLE BIREFLECTOR.
SE0100345D0 (en) * 2001-02-02 2001-02-02 Saab Ab Antenna system and reflector elements in antenna system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2406855A1 (en) 2012-01-18
WO2010102764A1 (en) 2010-09-16
DE202009003501U1 (en) 2009-05-20

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