EP0144672A2 - Collapsible antenna net reflector - Google Patents

Collapsible antenna net reflector Download PDF

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Publication number
EP0144672A2
EP0144672A2 EP84112745A EP84112745A EP0144672A2 EP 0144672 A2 EP0144672 A2 EP 0144672A2 EP 84112745 A EP84112745 A EP 84112745A EP 84112745 A EP84112745 A EP 84112745A EP 0144672 A2 EP0144672 A2 EP 0144672A2
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EP
European Patent Office
Prior art keywords
reflector
network
ribs
auxiliary
antenna network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84112745A
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German (de)
French (fr)
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EP0144672A3 (en
EP0144672B1 (en
Inventor
Henning Dipl.-Ing. Herbig
Horst Heinze
Franz Drachenberg
Knud Pontoppidan
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Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm AG
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Publication date
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Publication of EP0144672A2 publication Critical patent/EP0144672A2/en
Publication of EP0144672A3 publication Critical patent/EP0144672A3/en
Application granted granted Critical
Publication of EP0144672B1 publication Critical patent/EP0144672B1/en
Expired legal-status Critical Current

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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
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
    • H01Q15/161—Collapsible reflectors

Definitions

  • the invention relates to a deployable antenna network reflector, with a number of rigid support ribs, which are mounted so that they can be swung out radially on a support body and carry a metallic reflector network.
  • Such an antenna network reflector as it is mainly used in satellite technology, is known, for example, from Microwaves, March 1974, page 14.
  • the network reflector described there has, in addition to the reflector network attached to the top of the pivoting support ribs, a further adjustment network attached to the back of the support ribs.
  • the latter is connected to the reflector network in the sectors located between the radially swung out support ribs via a plurality of adjustable tensioning wires.
  • the aim of the adjustable tensioning wires is to ensure that the reflector network in the unfolded state between the supporting ribs assumes the desired parabolic shape that is already predetermined by this.
  • the invention has for its object to provide a deployable antenna network reflector of the type mentioned, in which the adjustment effort to set the desired parabolic shape of the reflector network is as low as possible.
  • auxiliary ribs are attached to the reflector network and are anchored with the aid of tensioning wires to the adjacent supporting ribs in such a way that the tensioning wires in the deployed state of the network reflector are a transverse component with respect to the have area spanned by the reflector network.
  • g ribs between the Tra attached to the reflector mesh auxiliary ribs is achieved in that the reflector network at least assumes a steady curvature in the region of these auxiliary ribs in the deployed state of the mesh reflector from the outset, as the individual with the point-wise adjustment by means of tension wires connected acute lowering in the reflector network do not occur here.
  • the number of tension wires provided between the auxiliary ribs and the support ribs, which due to their transverse component are able to exert a rearward pull on the auxiliary ribs, whereby a good approximation to the desired parabolic shape can be achieved, can obviously be chosen much less than in the case of the double network concept described above.
  • auxiliary ribs No further adjustment points are provided between the auxiliary ribs and the support ribs or between the auxiliary ribs themselves.
  • the total adjustment effort can thus be significantly reduced.
  • the number of relatively heavy support ribs can be reduced, which has a favorable effect on the total weight of the satellite.
  • the total number of ribs used can be increased by using the auxiliary ribs, which in turn brings about an improvement in the radiation properties.
  • the position and number of the side lobes of the radiation diagram that appear next to the main lobe depend on how many ribs are used in total. The more parabolic ribs there are, the further the side lobes move outwards.
  • the antenna network reflector according to the invention thus represents a simple and inexpensive concept which will be applicable to advantage in many cases.
  • a further advantage of the concept according to the invention is that temperature changes have a lesser extent in that the tension wires are now attached directly to the thermally relatively stable support ribs, and no longer to the adjustment network, which is more exposed to thermal contractions or expansions. whereby the adjustment accuracy is impaired.
  • a deployed antenna network reflector is shown in plan view in FIG. 1a.
  • the network reflector has a total of 12 support ribs 3, as well as 12 auxiliary ribs 4 arranged in the sectors between the support ribs 3. that should take the form of a paraboloid of revolution as precisely as possible.
  • the network consists of metal wire or metallized threads, for example of plastic.
  • the permissible mesh size is selected depending on the requirements with regard to the operating wavelength.
  • the support ribs 3 are pivotally mounted on a support body 1 (see. Fig. 1b), in such a way that they from the in the Fi g . 1a and 1b shown unfolded state can be pivoted vertically upwards.
  • the material of the support ribs 3 should be chosen so that the ribs have a high inherent rigidity and are at the same time as light as possible. Fiber-reinforced plastics are particularly suitable for this.
  • the length of the spacers 16 is adapted to the desired parabolic shape.
  • the auxiliary Ribs 4 are not attached to the carrier body 1, but only to the reflector net 2, preferably on the upper side thereof, for example glued or sewn. They are here only schematically g estell- te tension wires 5, which are secured to the support ribs 3 from the bottom of the reflector network 2 ago under tension.
  • adjusting pieces (6) see also FIGS. 2 and 3
  • the auxiliary ribs 4 obviously having to have a certain flexibility.
  • one or more auxiliary ribs 4 can be fastened to the reflector network 2 between two supporting ribs 3.
  • cuts are shown transversely to the supporting ribs 3, which in this case are designed as hollow profiles.
  • the reflector mesh 2 is attached to the top of the support ribs 3 by means of spacers 16.
  • the auxiliary ribs 4 are expediently on the top of the reflector network 2.
  • the adjusting pieces 6 serve to hold the tensioning wires 5, which are each anchored on the underside of the support ribs 3.
  • the direction of action of the tensioning wires 5 must have a component directed transversely to the reflector net 2, so that the train required for adjusting the auxiliary ribs, directed downwards or towards the rear of the reflector net 2, results. Quartz threads, for example, can be used as tension wires 5.
  • FIG. 3 A possible embodiment of the adjustment pieces 6, which are only indicated schematically in FIGS. 2a to 2c, is shown in FIG Fig. 3. Shown in cross section is part of the reflector network 2, an auxiliary rib 4 extending transversely to the plane of the drawing, which rests on the top of the reflector network 2, and the actual adjusting piece 6.
  • the latter consists of a plate 10 firmly connected to a hollow tube 9 , which rests on the underside of the reflector network 2 and is connected to the auxiliary rib 4, for example via rivet connections 17.
  • an axially displaceable, designed as a sliding sleeve 7 mounting piece is provided in the hollow tube 9.
  • This sliding sleeve 7 has on its outer surface two mutually opposite, axially parallel grooves 18 into which two corresponding cams 19 attached to the inside of the hollow tube 9 engage.
  • the sliding sleeve 7 has a threaded bore 20, expediently with a rotation lock, which corresponds to a threaded bolt 8, the head 21 of which is in turn mounted in a corresponding depression in the plate 10. Except for a small amount of play, the threaded bolt 8 cannot be moved in the axial direction, for example due to a locking pin 22 inserted below the head 21. Rotation of the threaded bolt 8 clearly leads to the sliding sleeve 7 being moved up or down in the axial direction .
  • the tensioning wires 5, which are anchored at the lower end of the sliding sleeve 7, and the reflector network 2 with the auxiliary rib 4 mounted thereon are put under more or less tension.
  • the auxiliary ribs 4 can thus be drawn more or less downward at the points where the adjusting pieces 6 engage, ie towards the rear of the reflector mesh.
  • a cross section through three supporting ribs 3 in the folded state is shown in a highly schematic manner.
  • the ref Lektornetz 2 carries between each two support ribs 3, each an auxiliary rib 4 with the associated adjusting pieces 6.
  • the latter and thus the auxiliary ribs 4 are releasable and with the help of releasable and when the antenna is re-inserted or; Lockable bracket 11 anchored to the spacers 16 of the support ribs 3.
  • This anchorage should be maintained during the start and transport phase.
  • This has the advantage that the auxiliary ribs 4 and adjusting pieces 6 assume a defined spatial position during this phase, which is associated with strong vibrations and loads, and the adjusting pieces cannot get tangled in the reflector network.
  • the reflector network is only free in the relatively narrow areas between the ribs and is only under the loads of its own mass during the start phase, in contrast to the double network concept discussed above, where the reflector network still depends on the mass of the adjustment network and the tensioning wires and their adjustment elements during the start accelerations is charged.
  • auxiliary ribs not shown, which are adjacent to the supporting ribs 13 and attached to the reflector network 2 above or below the plane of the drawing, care must of course be taken to ensure that these have the required flexibility at the folding points 23 of the reflector network 2.
  • joint regions 12 can be provided at the corresponding locations of the auxiliary ribs 14, which are designed to be correspondingly flexible. This can happen with out Auxiliary ribs 14 made of fiber-reinforced plastic occur in that the joint regions 12 are formed only from the fibers without the addition of synthetic resin.

Abstract

Dieser entfaltbare Antennen-Netzreflektor weist eine Anzahl von an einem Trägerkörper radial ausschwenkbar gelagerten, ein metallisches Reflektornetz (2) tragenden, starren Tragrippen (3) auf. Um den Justieraufwand zum Einstellen der gewünschten parabolischen Form des Reflektornetzes (2) möglichst gering zu halten, sind zwischen den Tragrippen (3) in radialer Anordnung jeweils eine oder mehrere Hilfsrippen (4) am Reflektornetz (2) angebracht. Die Hilfsrippen (4) sind mit Hilfe von Spanndrähten (5) justierbar an den benachbarten Tragrippen (3) verankert. Dabei weisen die Spanndrähte (5) im entfalteten Zustand des Netzreflektors eine Querkomponente bezüglich der durch das Reflektornetz (2) aufgespannten Fläche auf.This deployable antenna network reflector has a number of rigid support ribs (3) which are mounted on a carrier body and can be swung out radially and which carry a metallic reflector network (2). In order to keep the adjustment effort for setting the desired parabolic shape of the reflector network (2) as low as possible, one or more auxiliary ribs (4) are attached to the reflector network (2) between the support ribs (3) in a radial arrangement. The auxiliary ribs (4) are anchored to the adjacent supporting ribs (3) in an adjustable manner with the aid of tensioning wires (5). In the unfolded state of the network reflector, the tensioning wires (5) have a transverse component with respect to the area spanned by the reflector network (2).

Description

Die Erfindung betrifft einen entfaltbaren Antennen-Netzreflektor, mit einer Anzahl von an einem Trägerkörper radial ausschwenkbar gelagerten, ein metallisches Reflektornetz tragenden, starren Tragrippen.The invention relates to a deployable antenna network reflector, with a number of rigid support ribs, which are mounted so that they can be swung out radially on a support body and carry a metallic reflector network.

Ein derartiger Antennen-Netzreflektor, wie er vorwiegend in der Satellitentechnik verwendet wird, ist beispielsweise aus Microwaves, März 1974, Seite 14, bekannt. Der dort geschilderte Netzreflektor weist außer dem an der Oberseite der ausschwenkbaren Tragrippen befestigten Reflektornetz ein weiteres, an den'Rückseiten der Tragrippen angebrachtes Justiernetz auf. Letzteres ist in den zwischen den radial ausgeschwenkten Tragrippen befindlichen Sektoren über eine Vielzahl von justierbaren Spanndrähten mit dem Reflektornetz verbunden. Durch die justierbaren Spanndrähte soll erreicht werden, daß das Reflektornetz im entfalteten Zustand auch zwischen den Tragrippen die durch diese bereits vorgegebene, gewünschte parabolische Form möglichst genau annimmt. Die Justierung über diese Vielzahl von Spanndrähten bedeutet jedoch einen erheblichen Arbeitsaufwand, vor allem auch deshalb, weil die Verstellung jedes einzelnen Spanndrahtes sich sofort auf die benachbarten Justierpunkte auswirkt. Diese Schwierigkeiten verringern sich in dem Maße, wie die Anzahl der insgesamt verwendeten Tragrippen zunimmt, die in sich starr ausgebildet sind und eine definierte Parabelform vorgeben.Such an antenna network reflector, as it is mainly used in satellite technology, is known, for example, from Microwaves, March 1974, page 14. The network reflector described there has, in addition to the reflector network attached to the top of the pivoting support ribs, a further adjustment network attached to the back of the support ribs. The latter is connected to the reflector network in the sectors located between the radially swung out support ribs via a plurality of adjustable tensioning wires. The aim of the adjustable tensioning wires is to ensure that the reflector network in the unfolded state between the supporting ribs assumes the desired parabolic shape that is already predetermined by this. However, the adjustment using this large number of tensioning wires means a considerable amount of work, above all because the adjustment of each individual tensioning wire has an immediate effect on the adjacent adjustment points. These difficulties are reduced to the extent that the number of supporting ribs used in total increases, which are rigid in themselves and provide a defined parabolic shape.

Der Erfindung liegt die Aufgabe zugrunde, einen entfaltbaren Antennen-Netzreflektor der eingangs genannten Art bereitzustellen, bei dem der Justieraufwand zum Einstellen der gewünschten parabolischen Form des Reflektornetzes möglichst gering ist.The invention has for its object to provide a deployable antenna network reflector of the type mentioned, in which the adjustment effort to set the desired parabolic shape of the reflector network is as low as possible.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß zwischen den Tragrippen in radialer Anordnung jeweils eine oder mehrere Hilfsrippen am Reflektornetz angebracht und mit Hilfe von Spanndrähten justierbar an den benachbarten Tragrippen derart verankert sind, daß die Spanndrähte im entfalteten Zustand des Netzreflektors eine Querkomponente bezüglich der durch das Reflektornetz aufgespannten Fläche aufweisen.This object is achieved according to the invention in that between the supporting ribs in a radial arrangement in each case one or more auxiliary ribs are attached to the reflector network and are anchored with the aid of tensioning wires to the adjacent supporting ribs in such a way that the tensioning wires in the deployed state of the network reflector are a transverse component with respect to the have area spanned by the reflector network.

Mit Hilfe der zwischen den Tragrippen am Reflektornetz angebrachten Hilfsrippen wird erreicht, daß das Reflektornetz zumindest im Bereich dieser Hilfsrippen im entfalteten Zustand des Netzreflektors von vornherein eine stetige Krümmung annimmt, denn die mit der punktweisen Justierung mit Hilfe einzelner Spanndrähte verbundenen spitzen Senken im Reflektornetz treten hier nicht auf. Die Anzahl der zwischen den Hilfsrippen und den Tragrippen vorgesehenen Spanndrähte, die aufgrund ihrer Querkomponente in der Lage sind, einen nach hinten gerichteten Zug auf die Hilfsrippen auszuüben, wodurch eine gute Annäherung an die gewünschte parabolische Form erzielbar ist, kann ersichtlich weit geringer gewählt werden als im Falle des oben beschriebenen Doppelnetzkonzeptes. Zwischen den Hilfsrippen und den Tragrippen bzw. zwischen den Hilfsrippen selbst sind keine weiteren Justierpunkte vorgesehen. Der gesamte Justieraufwand kann damit erheblich verringert werden. Außerdem kann die Anzahl der relativ schweren Tragrippen herabgesetzt werden, was sich günstig auf das Gesamtgewicht des Satelliten auswirkt. Andererseits kann die Gesamtzahl der verwendeten Rippen durch den Einsatz der Hilfsrippen vergrößert werden, wodurch wiederum eine Verbesserung der Abstrahlungseigenschaften bewirkt wird. So ist z.B. die Lage und Anzahl der neben der Hauptkeule auftretenden Nebenzipfel des Strahlungsdiagramms davon abhängig, wieviel Rippen insgesamt verwendet werden. Je mehr parabolische Rippen nämlich vorhanden sind, desto weiter schieben sich die Nebenzipfel nach außen. Der erfindungsgemäße Antennen-Netzreflektor stellt somit ein einfaches und kostengünstiges Konzept dar, das in vielen Fällen mit Vorteil anwendbar sein wird.With the help of g ribs between the Tra attached to the reflector mesh auxiliary ribs is achieved in that the reflector network at least assumes a steady curvature in the region of these auxiliary ribs in the deployed state of the mesh reflector from the outset, as the individual with the point-wise adjustment by means of tension wires connected acute lowering in the reflector network do not occur here. The number of tension wires provided between the auxiliary ribs and the support ribs, which due to their transverse component are able to exert a rearward pull on the auxiliary ribs, whereby a good approximation to the desired parabolic shape can be achieved, can obviously be chosen much less than in the case of the double network concept described above. No further adjustment points are provided between the auxiliary ribs and the support ribs or between the auxiliary ribs themselves. The total adjustment effort can thus be significantly reduced. In addition, the number of relatively heavy support ribs can be reduced, which has a favorable effect on the total weight of the satellite. On the other hand, the total number of ribs used can be increased by using the auxiliary ribs, which in turn brings about an improvement in the radiation properties. For example, the position and number of the side lobes of the radiation diagram that appear next to the main lobe depend on how many ribs are used in total. The more parabolic ribs there are, the further the side lobes move outwards. The antenna network reflector according to the invention thus represents a simple and inexpensive concept which will be applicable to advantage in many cases.

Ein weiterer Vorteil des erfindungsgemäßen Konzeptes liegt darin, daß Temperaturänderungen sich insofern in geringerem Maße auswirken, als die Spanndrähte nunmehr direkt an den thermisch relativ stabilen Tragrippen befestigt sind, und nicht mehr an dem Justiernetz, welches thermisch bedingten Kontraktionen bzw. Dehnungen stärker ausgesetzt ist, wodurch die Justiergenauigkeit beeinträchtigt wird. Bei der Justierung erweist es sich zudem als günstig, daß sich die Verstellung eines Justierpunktes in weit geringerem Maße auf die benachbarten Justierpunkte auswirkt, als dies beim oben geschilderten Doppelnetzkonzept der Fall ist.A further advantage of the concept according to the invention is that temperature changes have a lesser extent in that the tension wires are now attached directly to the thermally relatively stable support ribs, and no longer to the adjustment network, which is more exposed to thermal contractions or expansions. whereby the adjustment accuracy is impaired. When adjusting, it also proves to be favorable that the adjustment of an adjustment point has a far smaller effect on the adjacent adjustment points than is the case with the double network concept described above.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous developments of the invention result from the subclaims.

Im folgenden soll die Erfindung an Hand von Abbildungen näher erläutert werden. Es zeigen in schematischer Weise:

  • Fig. 1a einen entfalteten Antennen-Netzreflektor in Draufsicht,
  • Fig. 1b den Netzreflektor der Fig. 1a im Querschnitt,
  • Fig. 2 die Anordnung einer sowie mehrerer Hilfsrippen zwischen zwei Tragrippen,
  • Fig. 3 den Querschnitt eines an einer Hilfsrippe befestigten Justierstückes,
  • Fig. 4 ausschnittweise einen gefalteten Netzreflektor, bei dem die Hilfsrippen durch Halterungsbügel an den Tragrippen verankert sind,
  • Fig. 5 in sich einklappbare Tragrippen,
  • Fig. 6 ausschnittweise eine Hilfsrippe mit biegsamem Gelenkbereich.
In the following, the invention will be explained in more detail with the aid of figures. They show in a schematic way:
  • 1a an unfolded antenna network reflector in plan view,
  • 1b in cross section, the network reflector of FIG. 1a,
  • 2 shows the arrangement of one and several auxiliary ribs between two supporting ribs,
  • 3 shows the cross section of an adjusting piece fastened to an auxiliary rib,
  • 4 a section of a folded net reflector, in which the auxiliary ribs are anchored to the supporting ribs by means of mounting brackets,
  • 5 collapsible support ribs,
  • Fig. 6 detail of an auxiliary rib with a flexible joint area.

In Fig. 1a ist in Draufsicht ein entfalteter Antennen-Netzreflektor dargestellt. Der Netzreflektor weist insgesamt 12 Tragrippen 3 auf, sowie ebenfalls 12 in den Sektoren zwischen den Tragrippen 3 angeordnete Hilfsrippen 4. An den Tragrippen 3, genauer über diesen, ist mit Hilfe von Abstandshaltern 16 (sh. Fig. 1b) ein Reflektornetz 2 aufgespannt, das möglichst genau die Form eines Rotationsparaboloids annehmen soll. Das Netz besteht aus Metalldraht oder metallisierten Fäden, beispielsweise aus Kunststoff. Je nach den Anforderungen hinsichtlich der Betriebswellenlänge wird die zulässige Maschenweite gewählt. Die Tragrippen 3 sind an einem Trägerkörper 1 (sh. Fig. 1b) schwenkbar gelagert, und zwar derart, daß sie aus dem in den Fig. 1a und 1b dargestellten entfalteten Zustand senkrecht nach oben geschwenkt werden können. Der Werkstoff der Tragrippen 3 sollte so gewählt werden, daß die Rippen eine hohe Eigensteifigkeit besitzen und gleichzeitig möglichst leicht sind. Hierfür kommen insbesondere faserverstärkte Kunststoffe in Frage. Die Länge der Abstandshalter 16 ist an die gewünschte parabolische Form angepaßt. Die Hilfsrippen 4 sind nicht an dem Trägerkörper 1, sondern lediglich am Reflektornetz 2, vorzugsweise auf dessen Oberseite, befestigt, beispielsweise verklebt oder vernäht. Sie werden durch hier nur schematisch dargestell- te Spanndrähte 5, die an den Tragrippen 3 befestigt sind, von der Unterseite des Reflektornetzes 2 her unter Spannung gesetzt. Um die Hilfsrippen 4 in die gewünschte parabolische Form zu bringen, können Justierstücke (6)(sh. auch die Fig. 2 und 3) vorgesehen sein, wobei die Hilfsrippen 4 ersichtlich eine gewisse Flexibilität besitzen müssen. Es ist aber auch möglich, die Hilfsrippen 4 eigensteif auszubilden, wobei dann die Justierstücke entfallen bzw. wesentlich einfacher ausgebildet sein können.A deployed antenna network reflector is shown in plan view in FIG. 1a. The network reflector has a total of 12 support ribs 3, as well as 12 auxiliary ribs 4 arranged in the sectors between the support ribs 3. that should take the form of a paraboloid of revolution as precisely as possible. The network consists of metal wire or metallized threads, for example of plastic. The permissible mesh size is selected depending on the requirements with regard to the operating wavelength. The support ribs 3 are pivotally mounted on a support body 1 (see. Fig. 1b), in such a way that they from the in the Fi g . 1a and 1b shown unfolded state can be pivoted vertically upwards. The material of the support ribs 3 should be chosen so that the ribs have a high inherent rigidity and are at the same time as light as possible. Fiber-reinforced plastics are particularly suitable for this. The length of the spacers 16 is adapted to the desired parabolic shape. The auxiliary Ribs 4 are not attached to the carrier body 1, but only to the reflector net 2, preferably on the upper side thereof, for example glued or sewn. They are here only schematically g estell- te tension wires 5, which are secured to the support ribs 3 from the bottom of the reflector network 2 ago under tension. In order to bring the auxiliary ribs 4 into the desired parabolic shape, adjusting pieces (6) (see also FIGS. 2 and 3) can be provided, the auxiliary ribs 4 obviously having to have a certain flexibility. However, it is also possible to design the auxiliary ribs 4 to be inherently stiff, in which case the adjusting pieces are omitted or can be made considerably simpler.

Wie in den Fig. 2a bis 2c in stark schematisierter Weise dargestellt, können zwischen je zwei Tragrippen 3 eine oder mehrere Hilfsrippen 4 an dem Reflektornetz 2 befestigt sein. Dargestellt sind jeweils Schnitte quer zu den Tragrippen 3, die in diesem Falle als Hohlprofile ausgebildet sind. Das Reflektornetz 2 ist auf der Oberseite der Tragrippen 3 mittels Abstandshaltern 16 befestigt. Die Hilfsrippen 4 liegen zweckmäßig auf der Oberseite des Reflektornetzes 2. Die Justierstücke 6 dienen zur Halterung der Spanndrähte 5, die jeweils an der Unterseite der Tragrippen 3 verankert sind. Die Wirkungsrichtung der Spanndrähte 5 muß eine quer zum Reflektornetz 2 gerichtete Komponente aufweisen, damit der zur Justierung der Hilfsrippen erforderliche, nach unten bzw. zur Rückseite des Reflektornetzes 2 hin gerichtete Zug resultiert. Als Spanndrähte 5 können beispielsweise Quarzfäden verwendet werden.As shown in FIGS. 2a to 2c in a highly schematic manner, one or more auxiliary ribs 4 can be fastened to the reflector network 2 between two supporting ribs 3. In each case, cuts are shown transversely to the supporting ribs 3, which in this case are designed as hollow profiles. The reflector mesh 2 is attached to the top of the support ribs 3 by means of spacers 16. The auxiliary ribs 4 are expediently on the top of the reflector network 2. The adjusting pieces 6 serve to hold the tensioning wires 5, which are each anchored on the underside of the support ribs 3. The direction of action of the tensioning wires 5 must have a component directed transversely to the reflector net 2, so that the train required for adjusting the auxiliary ribs, directed downwards or towards the rear of the reflector net 2, results. Quartz threads, for example, can be used as tension wires 5.

Eine mögliche Ausführungsform der in den Fig. 2a bis 2c nur schematisch angedeuten Justierstücke 6 zeigt die Fig. 3. Dargestellt ist im Querschnitt ein Teil des Reflektornetzes 2, eine sich quer zur Zeichenebene erstreckende Hilfsrippe 4, die auf der Oberseite des Reflektornetzes 2 aufliegt, sowie das eigentliche Justierstück 6. Letzteres besteht aus einem fest mit einem Hohlrohr 9 verbundenen Teller 10, der an der Unterseite des Reflektornetzes 2 anliegt und beispielsweise über Nietverbindungen 17 mit der Hilfsrippe 4 verbunden ist. In dem Hohlrohr 9 ist ein axial verschiebbares, als Gleithülse 7 ausgebildetes Halterungsstück vorgesehen. Diese Gleithülse 7 weist an ihrer Außenfläche zwei einander gegenüberliegende, achsparallele Rillen 18 auf, in die zwei entsprechende, an der Innenseite des Hohlrohres 9 angebrachte Nocken 19 eingreifen. Im unteren Teil weist die Gleithülse 7 eine Gewindebohrung 20, zweckmäßig mit Drehsicherung, auf, die mit einem Gewindebolzen 8 korrespondiert, dessen Kopf 21 wiederum in einer entsprechenden Einsenkung des Tellers 10 gelagert ist. Bis auf ein geringes Spiel kann der Gewindebolzen 8 nicht in axialer Richtung bewegt werden, und zwar beispielsweise aufgrund eines unterhalb des Kopfes 21 eingelassenen Sperrstiftes 22. Eine Drehung des Gewindebolzens 8 führt ersichtlich dazu, daß die Gleithülse 7 in axialer Richtung auf- oder abbewegt wird. Dadurch werden die Spanndrähte 5, die am unteren Ende der Gleithülse 7 verankert sind, sowie das Reflektornetz 2 mit der darauf angebrachten Hilfsrippe 4 mehr oder weniger unter Spannung gesetzt. Die Hilfsrippen 4 können also an den Stellen, wo die Justierstücke 6 angreifen, mehr oder weniger nach unten, d.h. zur Reflektornetz-Rückseite hingezogen werden.A possible embodiment of the adjustment pieces 6, which are only indicated schematically in FIGS. 2a to 2c, is shown in FIG Fig. 3. Shown in cross section is part of the reflector network 2, an auxiliary rib 4 extending transversely to the plane of the drawing, which rests on the top of the reflector network 2, and the actual adjusting piece 6. The latter consists of a plate 10 firmly connected to a hollow tube 9 , which rests on the underside of the reflector network 2 and is connected to the auxiliary rib 4, for example via rivet connections 17. In the hollow tube 9, an axially displaceable, designed as a sliding sleeve 7 mounting piece is provided. This sliding sleeve 7 has on its outer surface two mutually opposite, axially parallel grooves 18 into which two corresponding cams 19 attached to the inside of the hollow tube 9 engage. In the lower part, the sliding sleeve 7 has a threaded bore 20, expediently with a rotation lock, which corresponds to a threaded bolt 8, the head 21 of which is in turn mounted in a corresponding depression in the plate 10. Except for a small amount of play, the threaded bolt 8 cannot be moved in the axial direction, for example due to a locking pin 22 inserted below the head 21. Rotation of the threaded bolt 8 clearly leads to the sliding sleeve 7 being moved up or down in the axial direction . As a result, the tensioning wires 5, which are anchored at the lower end of the sliding sleeve 7, and the reflector network 2 with the auxiliary rib 4 mounted thereon are put under more or less tension. The auxiliary ribs 4 can thus be drawn more or less downward at the points where the adjusting pieces 6 engage, ie towards the rear of the reflector mesh.

In Fig. 4 ist in stark schematisierter Weise ein Querschnitt durch drei im gefalteten Zustand befindliche Tragrippen 3 dargestellt. Das ebenfalls gefaltete Reflektornetz 2 trägt zwischen je -zwei Tragrippen 3 jeweils eine Hilfsrippe 4 mit den zugehörigen Justierstücken 6. Letztere und damit die Hilfsrippen 4 sind mit Hilfe lösbarer und beim Wiedereinfalten der Antenne wiedereinsteck- bzw; -rastbarer Halterungsbügel 11 an den Abstandshaltern 16 der Tragrippen 3 verankert. Diese Verankerung soll während der Start- und Transportphase aufrechterhalten werden. Dies hat den Vorteil, daß die Hilfsrippen 4 und Justierstücke 6 während dieser mit starken Erschütterungen und Belastungen verbundenen Phase eine definierte räumliche Lage einnehmen und die Justierstücke sich nicht im Reflektornetz verheddern können. Das Reflektornetz ist nur in den relativ schmalen Bereichen zwischen den Rippen frei und steht während der Startphase nur unter den Belastungen seiner Eigenmasse, im Gegensatz zum eingangs diskutierten Doppelnetzkonzept, wo das Reflektornetz während der Startbeschleunigungen noch von der Masse des Justiernetzes sowie der Spanndrähte und ihrer Justierelemente belastet wird.In Fig. 4, a cross section through three supporting ribs 3 in the folded state is shown in a highly schematic manner. The ref Lektornetz 2 carries between each two support ribs 3, each an auxiliary rib 4 with the associated adjusting pieces 6. The latter and thus the auxiliary ribs 4 are releasable and with the help of releasable and when the antenna is re-inserted or; Lockable bracket 11 anchored to the spacers 16 of the support ribs 3. This anchorage should be maintained during the start and transport phase. This has the advantage that the auxiliary ribs 4 and adjusting pieces 6 assume a defined spatial position during this phase, which is associated with strong vibrations and loads, and the adjusting pieces cannot get tangled in the reflector network. The reflector network is only free in the relatively narrow areas between the ribs and is only under the loads of its own mass during the start phase, in contrast to the double network concept discussed above, where the reflector network still depends on the mass of the adjustment network and the tensioning wires and their adjustment elements during the start accelerations is charged.

In Fig. 5 sind zwei in sich einklappbare Tragrippen 13 im hochgeschwenkten bzw. gefalteten Zustand dargestellt, wobei die ebenfalls schematisch gezeigten justierbaren Abstandshalter 16 im entfalteten bzw. aufgeklappten Zustand eine parabolische Kontur nachbilden sollen. Hinsichtlich der nicht dargestellten, den Tragrippen 13 benachbarten und oberhalb bzw. unterhalb der Zeichenebene an dem Reflektornetz 2 befestigten Hilfsrippen muß natürlich dafür Sorge getragen werden, daß diese an den Faltungsstellen 23 des Reflektornetzes 2 die erforderliche Biegsamkeit aufweisen. Dazu können beispielsweise, wie in Fig. 6 dargestellt, an den entsprechenden Stellen der Hilfsrippen 14 Gelenkbereiche 12 vorgesehen sein, die entsprechend biegsam gestaltet sind. Dies kann bei aus faserverstärktem Kunststoff hergestellten Hilfsrippen 14 dadurch geschehen, daß die Gelenkbereiche 12 lediglich aus den Fasern ohne Zusatz von Kunstharz gebildet werden.5 two collapsible support ribs 13 are shown in the swung-up or folded state, the adjustable spacers 16 likewise shown schematically being intended to emulate a parabolic contour in the unfolded or unfolded state. With regard to the auxiliary ribs, not shown, which are adjacent to the supporting ribs 13 and attached to the reflector network 2 above or below the plane of the drawing, care must of course be taken to ensure that these have the required flexibility at the folding points 23 of the reflector network 2. For this purpose, for example, as shown in FIG. 6, joint regions 12 can be provided at the corresponding locations of the auxiliary ribs 14, which are designed to be correspondingly flexible. This can happen with out Auxiliary ribs 14 made of fiber-reinforced plastic occur in that the joint regions 12 are formed only from the fibers without the addition of synthetic resin.

Claims (8)

1. Entfaltbarer Antennen-Netzreflektor mit einer Anzahl von an einem Trägerkörper radial ausschwenkbar gelagerten, ein metallisches Reflektornetz tragenden, starren Tragrippen, dadurch gekennzeichnet , daß zwischen den Tragrippen (3) in radialer Anordnung jeweils eine oder mehrere Hilfsrippen (4) am Reflektornetz (2) angebracht und mit Hilfe von Spanndrähten (5) justierbar an den benachbarten Tragrippen (3) derart verankert sind, daß die Spanndrähte (5) im entfalteten Zustand des Netzreflektors eine Querkomponente bezüglich der durch das Reflektornetz (2) aufgespannten Fläche aufweisen.1. Unfoldable antenna network reflector with a number of rigid support ribs mounted radially swingably on a support body, carrying a metallic reflector network, characterized in that between the support ribs (3) in radial arrangement one or more auxiliary ribs (4) on the reflector network (2 ) are attached and anchored with the aid of tensioning wires (5) on the adjacent supporting ribs (3) in such a way that the tensioning wires (5) have a transverse component with respect to the area spanned by the reflector net (2) when the net reflector is unfolded. 2. Antennen-Netzreflektor nach Anspruch 1, dadurch gekennzeichnet , daß die Hilfsrippen (4) jeweils an mehreren, über ihre Länge verteilten Stellen mit besonderen Justierstücken (6) versehen sind, die jeweils senkrecht zum Reflektornetz (2) verschiebbare Halterungsstücke (7) für die Spanndrähte (5) aufweisen.2. Antenna network reflector according to claim 1, characterized in that the auxiliary ribs (4) are each provided at several, over their length locations with special adjustment pieces (6), each perpendicular to the reflector network (2) displaceable mounting pieces (7) for have the tension wires (5). 3. Antennen-Netzreflektor nach Anspruch 2, dadurch gekennzeichnet , daß die Halterungsstücke (7) mit Hilfe eines axialen Gewindebolzens (8) axial in einem Hohlrohr 19) verschiebbare Gleithülsen sind und das Hohlrohr (9) jeweils mit einem an der Rückseite des Reflektornetzes (2) anliegenden und an der Hilfsrippe (4) befestigten Teller (10) verbunden ist.3. Antenna network reflector according to claim 2, characterized in that the mounting pieces (7) with the aid of an axial threaded bolt (8) are axially displaceable in a hollow tube 19) sliding sleeves and the hollow tube (9) each with one on the back of the reflector network ( 2) adjoining and attached to the auxiliary rib (4) plate (10). 4. Antennen-Netzreflektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet , daß die Hilfsrippen (4) im gefalteten Zustand des Netzreflektors an den jeweils zu beiden Seiten benachbarten Tragrippen (3) mittels Halterungsbügeln (11) lösbar befestigt sind.4. Antenna network reflector according to one of the preceding claims, characterized in that the auxiliary ribs (4) in the folded state of the network reflector are releasably attached to the support ribs (3) adjacent to both sides by means of mounting brackets (11). 5. Antennen-Netzreflektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet , daß bei Verwendung ein- oder mehrfach in sich einklappbarer Tragrippen (13) die Hilfsrippen (14) biegsame Gelenkbereiche (12) aufweisen.5. Antenna network reflector according to one of the preceding claims, characterized in that when using single or multiple retractable support ribs (13), the auxiliary ribs (14) have flexible joint areas (12). 6. Antennen-Netzreflektor nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet , daß die Hilfsrippen (4,14) aus faserverstärktem Kunststoff bestehen.6. Antenna network reflector according to one of the preceding claims, characterized in that the auxiliary ribs (4, 14) consist of fiber-reinforced plastic. 7. Antennen-Netzreflektor nach Anspruch 5 und 6, dadurch gekennzeichnet , daß die Gelenkbereiche (12) der aus faserverstärktem Kunststoff bestehenden Hilfsrippen (14) aus den Fasern (15) ohne Zusatz von Kunstharz gebildet werden.7. antenna network reflector according to claim 5 and 6, characterized in that the hinge regions (12) of the fiber-reinforced plastic auxiliary ribs (14) from the fibers (15) are formed without the addition of synthetic resin. 8. Antennen-Netzreflektor nach Anspruch 7, dadurch gekennzeichnet , daß als Fasern (15) Aramid- oder Kohlefasern verwendet werden.8. Antenna network reflector according to claim 7, characterized in that aramid or carbon fibers are used as fibers (15).
EP84112745A 1983-10-27 1984-10-23 Collapsible antenna net reflector Expired EP0144672B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3338937 1983-10-27
DE19833338937 DE3338937A1 (en) 1983-10-27 1983-10-27 DEVELOPABLE AERIAL NET REFLECTOR

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EP0144672A2 true EP0144672A2 (en) 1985-06-19
EP0144672A3 EP0144672A3 (en) 1986-07-30
EP0144672B1 EP0144672B1 (en) 1989-09-06

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US (1) US4642652A (en)
EP (1) EP0144672B1 (en)
JP (1) JPS60173904A (en)
CA (1) CA1226935A (en)
DE (1) DE3338937A1 (en)

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DE3338937C2 (en) 1988-07-28
JPH0568883B2 (en) 1993-09-29
EP0144672A3 (en) 1986-07-30
JPS60173904A (en) 1985-09-07
CA1226935A (en) 1987-09-15
DE3338937A1 (en) 1985-05-09
US4642652A (en) 1987-02-10
EP0144672B1 (en) 1989-09-06

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