EP1098393A2 - Reflector antenna and method of fabricating a subreflector - Google Patents

Reflector antenna and method of fabricating a subreflector Download PDF

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Publication number
EP1098393A2
EP1098393A2 EP00250367A EP00250367A EP1098393A2 EP 1098393 A2 EP1098393 A2 EP 1098393A2 EP 00250367 A EP00250367 A EP 00250367A EP 00250367 A EP00250367 A EP 00250367A EP 1098393 A2 EP1098393 A2 EP 1098393A2
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EP
European Patent Office
Prior art keywords
reflector
reflective
reflector antenna
antenna according
subreflector
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.)
Withdrawn
Application number
EP00250367A
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German (de)
French (fr)
Other versions
EP1098393A3 (en
Inventor
Bernd Rümmeli
Brian Scott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rr Elektronische Gerate & Co KG GmbH
RR Elektronische Geraete GmbH and Co KG
Original Assignee
Rr Elektronische Gerate & Co KG GmbH
RR Elektronische Geraete GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rr Elektronische Gerate & Co KG GmbH, RR Elektronische Geraete GmbH and Co KG filed Critical Rr Elektronische Gerate & Co KG GmbH
Publication of EP1098393A2 publication Critical patent/EP1098393A2/en
Publication of EP1098393A3 publication Critical patent/EP1098393A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/12—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems
    • H01Q3/16—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device
    • H01Q3/20—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical relative movement between primary active elements and secondary devices of antennas or antenna systems for varying relative position of primary active element and a reflecting device wherein the primary active element is fixed and the reflecting device is movable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/005—Damping of vibrations; Means for reducing wind-induced forces
    • 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

Definitions

  • the invention relates to a reflector antenna with a main reflector, in front of the incident rays a reflecting surface provided subreflector rotatable is arranged.
  • the invention relates to a method for manufacturing of a sub-reflector for a reflector antenna.
  • a reflector antenna from a radiation source originating rays for example rays from a satellite, received and forwarded for reinforcement.
  • a main reflector is provided for this purpose, on which the rays hit and are reflected.
  • the reflected rays then hit a subreflector, about the focus of the main antenna designed as a bowl is trained.
  • the subreflector in turn has a reflective layer facing the main reflector, the the rays reflected by the main reflector in turn Direction towards one located in the center of the main reflector Deflects transducer.
  • the subreflector is rotatable in the focal point of the main reflector.
  • speeds come in the range between 200 and 400 rpm.
  • the subreflector is eccentric to one through a center point of the main reflector extending axis mounted on an axis of rotation. On this way he scans the main reflector in an area which is conical from the subreflector towards the main reflector opens.
  • This eccentrically mounted subreflector produces unwanted ones Vibrations that are in the mount of the subreflector Make vibrations noticeable. Because of these vibrations the received signals falsified. From the state of the Technology is known to be a solution that focuses on its focus rotating sub-reflector arranged on an axis of rotation is, which is essentially in the direction of the axis of the Main reflector extends. However, the axis of the sub-reflector runs not in the direction of the axis of the main reflector, so that also by the deviation a vibration effect in the bracket of the sub-reflector is generated. This vibration effect however, it should be within the speed range maintained by the subreflector affect the strength of the received signals little.
  • the object of the present invention is therefore the reflector antenna of the type mentioned so that the improvement A vibration effect is prevented.
  • This object is achieved in that the Subreflector one in the direction of a main axis of the main reflector extending axis on which the subreflector rotatable at a high speed of around 1500 to 3500 rpm is stored.
  • This measure makes the main reflector from the subreflector scanned in quick succession, so that in this way a Variety of beams received by the sub-reflector and towards be reflected on the transducer. This will make a strong signal in a following the main reflector Circuit generated. Although the axis of rotation in the direction of Axis of the main reflector is aligned, becomes a large one Number of rays on the hyperbolic reflector surface of the Reflected in the direction of the transducer.
  • the sub-reflector is free of vibrations on its axis. To do this, the subreflector must be mounted very precisely be taken care of on the axis and on the other hand the subreflector be given training that is even at high No vibrations are generated in the bearings.
  • the subreflector is designed as a rotating body that is free of unbalance.
  • Such training requires a lot careful constructive solution since the reflective surfaces the rays that occur must meet the requirement to reflect as completely as possible towards the transducer. Because this requirement primarily the design of the reflector influenced, to fulfill the further requirement, the sub-reflector vibration-free even at high speeds storage, made considerable constructive efforts become.
  • the rotating body consists of a non-reflecting rays Mass in which a reflective surface is embedded.
  • the rotating body is given the non-reflecting mass a compact design that even at high speeds enables vibration-free rotation.
  • the mass is shaped in the form of a cylinder made up of two interconnected There are parts, one of them to the other facing end has the reflective surface, in which fits the end of the other part in a form. On this ensures that the reflective surface even at high speeds, no own movements, for example generated by flutter. On the one hand, it is firm with the non-reflective mass, and on the other hand it also from the other part in terms of training one fixed rotating body.
  • a reflective to form the reflective surface Layer applied to the non-reflective mass is a reflective to form the reflective surface Layer applied to the non-reflective mass.
  • This layer adheres firmly to the non-reflective mass, so that even at high speeds they have no mass independent movements, such as fluttering movements can perform.
  • the reflective layer consists of an aluminum layer, which is firmly connected to the mass. This connection can achieved according to a further preferred embodiment be that the aluminum layer on the non-reflective Mass is evaporated.
  • a reflector antenna consists essentially of one Main reflector (1), a subreflector (2), the subreflector (2) driving motor (3), a transducer (4) and a recorded signal (5, 6) converting detector 5. Off These can be converted via a Derivation (6) can be derived for further processing.
  • the main reflector (1) is essentially one with one parabolic inner surface (7) provided non-rotating Bowl formed, possibly on a not shown Frame is mounted on which it is a radiation transmitter, for example a satellite (8) with regard to it respective position relative to the main reflector (1) is arranged.
  • Rays (10, 11) is a reflective surface (13) of the sub-reflector (2) arranged.
  • This reflective Surface (13) is with a first part (12) of the subreflector firmly connected.
  • This first part (12) is part of a cylinder (14) formed on its reflective Surface (13) facing away from a circular surface (15) is limited.
  • This first part (12) of the cylinder (14) corresponds to a second part (16) of the sub-reflector (2), which is also in shape of a cylinder with one facing away from the first part (12) circular surface (17) is formed.
  • this second Part (16) is a recess shown with dashed lines (18), which is suitable for the reflective Fit surface (13) of the first part (12) appropriately.
  • the merged Parts 12, 16 result in a circular shape on both sides Areas (15, 17) limited cylinder (14).
  • the material the two parts (12, 16) do not reflect short waves. Only the reflecting surface (13) reflects that of the Main reflector (1) reflected rays (11) in the direction of the receiver (4).
  • This can, for example, from a Paint or consist of a film, each arranged on one of the circular surface (15) opposite Carrier surface (20) is applied.
  • This support surface (20) has an education that a reflection of the rays (10, 11) favored towards the receiver (4).
  • the support surface (20) can be a hyperbolic Training.
  • This support surface (20) fits the coating (19) applied to them, through whose Application of the support surface (20) to the reflective surface (13) will.
  • the recess corresponds to the reflecting surface (13) (18) formed as a paraboloid. This is so careful made that the reflective surface (13) positively is received in the recess (18) so that the two parts (12, 16) by inserting the reflective surface (13) in the recess (18) so firmly connected can be, for example by gluing that the a part (12) even when subjected to considerable forces does not make movements relative to the other part (16). So the entire cylinder (14) can rotate at high speeds can be moved without the two parts (12, 16) would make independent movements.
  • the cylinder (14) including the engine (3) is with the help a construction, not shown, towards the Radiation source (8) stored in front of the main reflector (1) so that the motor (3) via a drive shaft () 21) the cylinder (14) can turn in revolutions.
  • the arrangement of the Cylinder (14) hit so that its center axis to the the cylinder (14) rotates in the direction of one through the Main reflector (1) extending main axis (22) extends.
  • a cylinder axis also extends in the direction of this main axis (22) (23) of the cylinder (14), so that in the direction the main axis (22) both the drive shaft (21) and the Cylinder axis (23) extends. This ensures that no deviations of the cylinder axis (23) from the Main axis (22) are present, so that with a very calm Running of the driven cylinder (14) is to be expected.
  • the cylinder (14) does not cause any imbalances generates, which leads to a troubled barrel of the cylinder (14) could lead.
  • the cylinder (14) consists of a evenly distributed material with one over the entire area of the cylinder (14) constant specific weight. This the coating (19) also has a specific weight, which is arranged on the support surface (20). In this way care is taken to ensure that none of the cylinders (14) Imbalances carried into the entire rotating structure become. That consisting of the motor (3) and the subreflector (2) rotating structures therefore run even at high numbers of turns vibration free. That of the subreflector (2) towards the sensor (4) reflected rays (10, 11) therefore provide in the detector (5) for signals of optimal strength.
  • the subreflector (2) is produced in such a way that that first the two parts (12, 16) are molded, for example by machining or by a corresponding Casting process. This ensures that the support surface (20) well and positively into the recess (18) is fitted.
  • the carrier surface (20) with the coating (19) Mistake.
  • the coating can for example applied as a colorant i.e. either sprayed onto the support surface (20) or can be applied with a brush.
  • the reflective surface (13) which is then in the recess (18) of the second part (16) fitted and with this is connected.
  • This connection can be made using a very thin adhesive layer can be made. Furthermore, made sure that the adhesive has the specific weight the non-reflective material on the one hand and the coating (19) on the other hand.
  • Axis (23) is provided on the first part (12), with which the drive shaft (21) of the motor (3) is connected.
  • Corresponding coupling pieces can be used with the second Part (12) of the cylinder (14) are connected.

Abstract

The antenna includes a main reflector, in front of which, in the direction of incident radiation, a sub-reflector with a reflecting surface is rotatably arranged. The sub-reflector (2) comprises a cylindrical axis (23) that lies in the direction of a main axis (22) of the main reflector (1), the sub-reflector being rotatably mounted on the cylindrical axis so that it can rotate at high speeds of 1500 to 3500 rpm. The sub-reflector may be mounted in an vibration-free manner, and free from unbalance. An Independent claim is included for a method of manufacturing a reflector for a reflecting antenna.

Description

Die Erfindung betrifft eine Reflektorantenne mit einem Hauptreflektor, vor dem in Richtung einfallender Strahlen ein mit einer reflektierenden Fläche versehener Subreflektor drehbar angeordnet ist.The invention relates to a reflector antenna with a main reflector, in front of the incident rays a reflecting surface provided subreflector rotatable is arranged.

Darüberhinaus betrifft die Erfindung ein Verfahren zum Herstellen eines Subreflektors für eine Reflektorantenne.Furthermore, the invention relates to a method for manufacturing of a sub-reflector for a reflector antenna.

Mit Hilfe einer Reflektorantenne werden von einer Strahlenquelle stammende Strahlen, beispielsweise Strahlen eines Satelliten, empfangen und zum Zwecke der Verstärkung weitergeleitet. Zu diesem Zwecke ist ein Hauptreflektor vorgesehen, auf den die Straheln auftreffen und reflektiert werden. Die reflektierten Strahlen treffen sodann auf einen Subreflektor, der etwa im Brennpunkt der als Schüssel ausgebildeten Hauptantenne ausgebildet ist. Der Subreflektor besitzt seinerseits eine dem Hauptreflektor zugewandte reflektierende Schicht, die die vom Hauptreflektor reflektierten Strahlen ihrerseits in Richtung auf einen im Zentrum des Hauptreflektors angeordneten Aufnehmer umlenkt. Um dem Subreflektor einen möglichst großen Querschnitt zu verschaffen, ist dieser drehbar im Brennpunkt des Hauptreflektors angeordnet. Dabei kommen Drehzahlen im Bereich zwischen 200 und 400 U/min in Betracht. Der Subreflektor ist exzentrisch zu einer durch einen Mittelpunkt des Hauptreflektors verlaufenden Achse auf einer Drehachse gelagert. Auf diese Weise tastet er den Hauptreflektor in einem Bereich ab, der sich konisch vom Subreflektor in Richtung auf den Hauptreflektor öffnet.With the help of a reflector antenna from a radiation source originating rays, for example rays from a satellite, received and forwarded for reinforcement. A main reflector is provided for this purpose, on which the rays hit and are reflected. The reflected rays then hit a subreflector, about the focus of the main antenna designed as a bowl is trained. The subreflector in turn has a reflective layer facing the main reflector, the the rays reflected by the main reflector in turn Direction towards one located in the center of the main reflector Deflects transducer. To make the subreflector as large as possible To create a cross-section, it is rotatable in the focal point of the main reflector. Here, speeds come in the range between 200 and 400 rpm. The subreflector is eccentric to one through a center point of the main reflector extending axis mounted on an axis of rotation. On this way he scans the main reflector in an area which is conical from the subreflector towards the main reflector opens.

Dieser exzentrisch gelagerte Subreflektor erzeugt unerwünschte Schwingungen, die sich in der Halterung des Subreflektors als Vibrationen bemerkbar machen. Aufgrund dieser Vibrationen werden die empfangenen Signale verfälscht. Aus dem Stand der Technik ist eine Lösung bekannt, bei der ein um seinen Schwerpunkt rotierender Subreflektor auf einer Drehachse angeordnet ist, die sich im wesentlichen in Richtung der Achse des Hauptreflektors erstreckt. Jedoch verläuft die Achse des Subreflektors nicht in Richtung der Achse des Hauptreflektors, so daß auch durch die Abweichung ein Vibrationseffekt in der Halterung des Subreflektors erzeugt wird. Dieser Vibrationseffekt soll jedoch im Rahmen der vom Subreflektor eingehaltenen Drehzahlen die Stärke der empfangenen Signale nur wenig beeinträchtigen.This eccentrically mounted subreflector produces unwanted ones Vibrations that are in the mount of the subreflector Make vibrations noticeable. Because of these vibrations the received signals falsified. From the state of the Technology is known to be a solution that focuses on its focus rotating sub-reflector arranged on an axis of rotation is, which is essentially in the direction of the axis of the Main reflector extends. However, the axis of the sub-reflector runs not in the direction of the axis of the main reflector, so that also by the deviation a vibration effect in the bracket of the sub-reflector is generated. This vibration effect however, it should be within the speed range maintained by the subreflector affect the strength of the received signals little.

Aufgabe der vorliegenden Erfindung ist es daher, die Reflektorantenne der eingangs genannten Art so zu verbessern, daß das Entstehen eines Vibrationseffektes verhindert wird.The object of the present invention is therefore the reflector antenna of the type mentioned so that the improvement A vibration effect is prevented.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Subreflektor eine in Richtung einer Hauptachse des Hauptreflektors verlaufende Achse aufweist, auf der der Subreflektor mit einer hohen Drehzahl von etwa 1500 bis 3500 U/min drehbar gelagert ist.This object is achieved in that the Subreflector one in the direction of a main axis of the main reflector extending axis on which the subreflector rotatable at a high speed of around 1500 to 3500 rpm is stored.

Durch diese Maßnahme wird der Hauptreflektor vom Subreflektor in schneller Folge abgetastet, so daß auf diese Weise eine Vielzahl von Strahlen vom Subreflektor empfangen und in Richtung auf den Aufnehmer reflektiert werden. Dadurch wird ein starkes Signal in einer dem Hauptreflektor nachfolgenden Schaltung erzeugt. Obgleich die Drehachse in Richtung der Achse des Hauptreflektors ausgerichtet ist, wird eine große Anzahl von Strahlen auf der hyperbolischen Reflektorfläche des Reflektors in Richtung auf den Aufnehmer reflektiert.This measure makes the main reflector from the subreflector scanned in quick succession, so that in this way a Variety of beams received by the sub-reflector and towards be reflected on the transducer. This will make a strong signal in a following the main reflector Circuit generated. Although the axis of rotation in the direction of Axis of the main reflector is aligned, becomes a large one Number of rays on the hyperbolic reflector surface of the Reflected in the direction of the transducer.

Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung ist der Subreflektor auf seiner Achse frei von Vibrationen gelagert. Dazu muß für eine sehr exakte Lagerung des Subreflektors auf der Achse gesorgt werden und andererseits dem Subreflektor eine Ausbildung gegeben werden, die auch bei hohen Drehzahlen keine Schwingungen in der Lagerung erzeugt.According to a further preferred embodiment of the invention the sub-reflector is free of vibrations on its axis. To do this, the subreflector must be mounted very precisely be taken care of on the axis and on the other hand the subreflector be given training that is even at high No vibrations are generated in the bearings.

Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung ist der Subreflektor als ein Drehkörper ausgebildet, der frei von Unwuchten ist. Eine derartige Ausbildung bedarf einer sehr sorgfältigen konstruktiven Lösung, da die reflektierenden Flächen der Forderung genügen müssen, die auftretenden Strahlen möglichst vollständig in Richtung auf den Aufnehmer zu reflektieren. Da diese Forderung primär die Gestaltung des Reflektors beeinflußt, müssen zur Erfüllung der weitergehenden Forderung, den Subreflektor auch bei hohen Drehzahlen vibrationsfrei zu lagern, erhebliche konstruktive Anstrengungen unternommen werden.According to a further preferred embodiment of the invention the subreflector is designed as a rotating body that is free of unbalance. Such training requires a lot careful constructive solution since the reflective surfaces the rays that occur must meet the requirement to reflect as completely as possible towards the transducer. Because this requirement primarily the design of the reflector influenced, to fulfill the further requirement, the sub-reflector vibration-free even at high speeds storage, made considerable constructive efforts become.

Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung besteht der Drehkörper aus einer Strahlen nicht reflektierenden Masse, in die eine reflektierende Fläche eingebettet ist. Durch die nicht reflektierende Masse erhält der Drehkörper eine kompakte Ausbildung, die auch bei hohen Drehzahlen eine vibrationsfreie Drehung ermöglicht.According to a further preferred embodiment of the invention the rotating body consists of a non-reflecting rays Mass in which a reflective surface is embedded. The rotating body is given the non-reflecting mass a compact design that even at high speeds enables vibration-free rotation.

Gemäß einer weiteren bevorzugten Ausführungsform ist die Masse in Form eines Zylinders geformt, der aus zwei miteinander verbundenen Teilen besteht, von denen das eine an seinem dem anderen zugewandten Ende die reflektierende Fläche aufweist, in die das Ende des anderen Teils formflüssig hineinpaßt. Auf diese Weise wird gewährleistet, daß die reflektierende Fläche auch bei hohen Drehzahlen keine Eigenbewegungen, beispielsweise durch Flattern erzeugt. Sie ist einerseits fest mit der nichtreflektierenden Masse verbunden, und andererseits wird sie auch von dem anderen Teil im Sinne der Ausbildung eines festen Drehkörpers beaufschlagt.According to a further preferred embodiment, the mass is shaped in the form of a cylinder made up of two interconnected There are parts, one of them to the other facing end has the reflective surface, in which fits the end of the other part in a form. On this ensures that the reflective surface even at high speeds, no own movements, for example generated by flutter. On the one hand, it is firm with the non-reflective mass, and on the other hand it also from the other part in terms of training one fixed rotating body.

Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung ist zur Ausbildung der reflektierenden Fläche eine reflektierende Schicht auf die nichtreflektierende Masse aufgebracht. Diese Schicht haftet fest auf der nichtreflektierenden Masse, so daß sie auch bei hohen Drehzahlen keine gegenüber der Masse eigenständigen Bewegungen, beispielsweise Flatterbewegungen durchführen kann.According to a further preferred embodiment of the invention is a reflective to form the reflective surface Layer applied to the non-reflective mass. This layer adheres firmly to the non-reflective mass, so that even at high speeds they have no mass independent movements, such as fluttering movements can perform.

Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung besteht die reflektierende Schicht aus einer Aluminiumschicht, die fest mit der Masse verbunden ist. Diese Verbindung kann gemäß einer weiteren bevorzugten Ausführungsform dadurch erreicht werden, daß die Aluminiumschicht auf die nicht reflektierende Masse aufgedampft ist.According to a further preferred embodiment of the invention the reflective layer consists of an aluminum layer, which is firmly connected to the mass. This connection can achieved according to a further preferred embodiment be that the aluminum layer on the non-reflective Mass is evaporated.

Weitere Einzelheiten der Erfindung ergeben sich der nachfolgenden ausführlichen Beschreibung und den beigefügten Zeichnungen, in denen eine bevorzugte Ausführungsform der Erfindung beispielsweise veranschaulicht ist.Further details of the invention follow from the following detailed description and the accompanying drawings, in which a preferred embodiment of the invention for example.

In den Zeichnungen zeigen:

Figur 1:
eine räumliche Darstellung der wesentlichen Teile einer Reflektorantenne,
Figur 2:
eine Seitenansicht eines eine reflektierende Schicht tragenden Teils einer Reflektorantenne,
Figur 3:
eine Seitenansicht eines die reflektierende Schicht aufnehmenden zweiten Teils einer Reflektorantenne,
Figur 4:
eine Grundfläche des in Figur 3 dargestellten Teils,
Figur 5:
eine Grundfläche des in Figur 2 dargestellten Teils und
Figur 6:
eine Seitenansicht eines aus den beiden Teilen der Figuren 2 und 3 zusammengesetzten Subreflektors mit einem ihn antreibenden Motor.
The drawings show:
Figure 1:
a spatial representation of the essential parts of a reflector antenna,
Figure 2:
2 shows a side view of a part of a reflector antenna which carries a reflective layer,
Figure 3:
2 shows a side view of a second part of a reflector antenna that receives the reflective layer,
Figure 4:
a base of the part shown in Figure 3,
Figure 5:
a base of the part shown in Figure 2 and
Figure 6:
a side view of a sub-reflector composed of the two parts of Figures 2 and 3 with a motor driving it.

Eine Reflektorantenne besteht im wesentlichen aus einem Hauptreflektor (1), einem Subreflektor (2), einem den Subreflektor (2) antreibenden Motor (3), einem Aufnehmer (4) sowie einem aufgenommene Signale (5, 6) umwandelnden Detektor 5. Aus diesen können die im Detektor umgewandelten Signale über eine Ableitung (6) zur weiteren Bearbeitung abgeleitet werden.A reflector antenna consists essentially of one Main reflector (1), a subreflector (2), the subreflector (2) driving motor (3), a transducer (4) and a recorded signal (5, 6) converting detector 5. Off These can be converted via a Derivation (6) can be derived for further processing.

Der Hauptreflektor (1) ist als eine im Wesentlichen mit einer parabolischen Innenfläche (7) versehene nicht rotierende Schüssel ausgebildet, die gegebenenfalls auf einem nicht dargestellten Gestell montiert ist, auf dem sie einem Strahlensender, beispielsweise einem Satelliten (8) hinsichtlich dessen jeweiliger Position gegenüber dem Hauptreflektor (1) nachführbar angeordnet ist.The main reflector (1) is essentially one with one parabolic inner surface (7) provided non-rotating Bowl formed, possibly on a not shown Frame is mounted on which it is a radiation transmitter, for example a satellite (8) with regard to it respective position relative to the main reflector (1) is arranged.

In einem Brennpunkt (9) aller von dem Hauptreflektor (1) reflektierten Strahlen (10, 11) ist eine reflektierende Fläche (13) des Subreflektors (2) angeordnet. Diese reflektierende Fläche (13) ist mit einem ersten Teil (12) des Subreflektors fest verbunden. Dieser erste Teil (12) ist als Teil eines Zylinders (14) ausgebildet, der auf seiner der reflektierenden Fläche (13) abgewandten Begrenzung von einer kreisrunden Fläche (15) begrenzt ist.In a focal point (9) of all reflected by the main reflector (1) Rays (10, 11) is a reflective surface (13) of the sub-reflector (2) arranged. This reflective Surface (13) is with a first part (12) of the subreflector firmly connected. This first part (12) is part of a cylinder (14) formed on its reflective Surface (13) facing away from a circular surface (15) is limited.

Diesem ersten Teil (12) des Zylinders (14) entspricht ein zweiter Teil (16) des Subreflektors (2), der ebenfalls in Form eines Zylinders mit einer dem ersten Teil (12) abgewandten kreisrunden Fläche (17) ausgebildet ist. In diesem zweiten Teil (16) ist eine mit gestrichelten Linien dargestellte Ausnehmung (18) ausgebildet, die geeignet ist, die reflektierende Fläche (13) des ersten Teils (12) passend aufzunehmen. Die zusammengefügten Teile 12, 16 ergeben einen beidseits von kreisrunden Flächen (15, 17) begrenzten Zylinder (14). Das Material der beiden Teile (12, 16) reflektiert keine Kurzwellen. Lediglich die reflektierende Fläche (13) reflektiert die von dem Hauptreflektor (1) relfektierten Strahlen (11) in Richtung auf den Aufnahmer (4).This first part (12) of the cylinder (14) corresponds to a second part (16) of the sub-reflector (2), which is also in shape of a cylinder with one facing away from the first part (12) circular surface (17) is formed. In this second Part (16) is a recess shown with dashed lines (18), which is suitable for the reflective Fit surface (13) of the first part (12) appropriately. The merged Parts 12, 16 result in a circular shape on both sides Areas (15, 17) limited cylinder (14). The material the two parts (12, 16) do not reflect short waves. Only the reflecting surface (13) reflects that of the Main reflector (1) reflected rays (11) in the direction of the receiver (4).

Zu diesem Zwecke ist die reflektierende Fläche (13) mit einer Beschichtung (19) versehen. Diese kann beispielsweise aus einem Farbanstrich oder aus einer Folie bestehen, die jeweils auf einer der kreisrunde Fläche (15) gegenüber angeordneten Trägerfläche (20) aufgetragen ist. Diese Trägerfläche (20) besitzt eine Ausbildung, die eine Reflektion der Strahlen (10, 11) in Richtung auf den Aufnahmer (4) begünstigt. Zu diesem Zwecke kann die Trägerfläche (20) beispielsweise eine hyperbolische Ausbildung besitzten. Dieser Trägerfläche (20) paßt sich die auf sie aufgebrachte Beschichtung (19) an, durch deren Aufbringung die Trägerfläche (20) zur reflektierenden Fläche (13) wird.For this purpose, the reflecting surface (13) with a Provide coating (19). This can, for example, from a Paint or consist of a film, each arranged on one of the circular surface (15) opposite Carrier surface (20) is applied. This support surface (20) has an education that a reflection of the rays (10, 11) favored towards the receiver (4). To this For example, the support surface (20) can be a hyperbolic Training. This support surface (20) fits the coating (19) applied to them, through whose Application of the support surface (20) to the reflective surface (13) will.

Entsprechend der reflektierenden Fläche (13) ist die Ausnehmung (18) als ein Paraboloid ausgebildet. Dieser ist so sorgfältigt gefertigt, daß die reflektierende Fläche (13) formschlüssig in die Ausnehmung (18) aufgenommen wird, so daß die beiden Teile (12, 16) durch Einfügen der reflektierenden Fläche (13) in die Ausnehmung (18) so fest miteinander verbunden werden können, beispielsweise durch eine Verklebung, daß das eine Teil (12) auch bei Einwirkung von erheblichen Kräften nicht gegenüber dem anderen Teil (16) Bewegungen ausführt. So kann der gesamte Zylinder (14) mit großen Drehzahlen in Umdrehungen versetzt werden, ohne daß die beiden Teile (12, 16) voneinander unabhängige Bewegungen durchführen würden.The recess corresponds to the reflecting surface (13) (18) formed as a paraboloid. This is so careful made that the reflective surface (13) positively is received in the recess (18) so that the two parts (12, 16) by inserting the reflective surface (13) in the recess (18) so firmly connected can be, for example by gluing that the a part (12) even when subjected to considerable forces does not make movements relative to the other part (16). So the entire cylinder (14) can rotate at high speeds can be moved without the two parts (12, 16) would make independent movements.

Der Zylinder (14) einschließlich des Motors (3) wird mit Hilfe einer nicht dargestellten Konstruktion in Richtung auf die Strahlenquelle (8) vor dem Hauptreflektor (1) gelagert, so daß der Motor (3) über eine Antriebswelle ()21) den Zylinder (14) in Umdrehungen versetzen kann. Dabei wird die Anordnung des Zylinders (14) so getroffen, daß seine MIttelachse, um die sich der Zylinder (14) dreht, in Richtung einer sich durch den Hauptreflektor (1) erstreckenden Hauptachse (22) verläuft. In Richtung dieser Hauptachse (22) erstreckt sich auch eine Zylinderachse (23) des Zylinders (14), so daß sich in Richtung der Hauptachse (22) sowohl die Antriebswelle (21) als auch die Zylinderachse (23) erstreckt. Auf diese Weise ist gewährleistet, daß keine Abweichungen der Zylinderachse (23) von der Hauptachse (22) vorhanden sind, so daß mit einem sehr ruhigen Lauf des angetriebenen Zylinders (14) zu rechnen ist.The cylinder (14) including the engine (3) is with the help a construction, not shown, towards the Radiation source (8) stored in front of the main reflector (1) so that the motor (3) via a drive shaft () 21) the cylinder (14) can turn in revolutions. The arrangement of the Cylinder (14) hit so that its center axis to the the cylinder (14) rotates in the direction of one through the Main reflector (1) extending main axis (22) extends. In A cylinder axis also extends in the direction of this main axis (22) (23) of the cylinder (14), so that in the direction the main axis (22) both the drive shaft (21) and the Cylinder axis (23) extends. This ensures that no deviations of the cylinder axis (23) from the Main axis (22) are present, so that with a very calm Running of the driven cylinder (14) is to be expected.

Darüberhinaus werden jedoch auch vom Zylinder (14) keine Unwuchten erzeugt, die zu einem unruhigen Lauf des Zylinders (14) führen könnten. Der Zylinder (14) besteht aus einem gleichmäßig verteilten Material mit einem im gesamten Bereich des Zylinders (14) gleichbleibenden spezifischen Gewicht. Dieses spezifische Gewicht besitzt auch die Beschichtung (19), die auf der Trägerfläche (20) angeordnet ist. Auf diese Weise ist dafür Sorge getragen, daß durch den Zylinder (14) keine Unwuchten in das gesamte rotierende Gebilde hineingetragen werden. Das aus dem Motor (3) und dem Subreflektor (2) bestehende rotierende Gebilde läuft daher auch bei hohen Drhezahlen vibrationsfrei. Die von dem Subreflektor (2) in Richtung auf den Aufnehmer (4) reflektierten Strahlen (10, 11) sorgen daher im Detektor (5) für Signale optimaler Stärke.In addition, however, the cylinder (14) does not cause any imbalances generates, which leads to a troubled barrel of the cylinder (14) could lead. The cylinder (14) consists of a evenly distributed material with one over the entire area of the cylinder (14) constant specific weight. This the coating (19) also has a specific weight, which is arranged on the support surface (20). In this way care is taken to ensure that none of the cylinders (14) Imbalances carried into the entire rotating structure become. That consisting of the motor (3) and the subreflector (2) rotating structures therefore run even at high numbers of turns vibration free. That of the subreflector (2) towards the sensor (4) reflected rays (10, 11) therefore provide in the detector (5) for signals of optimal strength.

Die Herstellung des Subreflektors (2) geschieht in der Weise, daß zunächst die beiden Teile (12, 16) geformt werden, beispielsweise durch spanende Bearbeitung oder durch ein entsprechendes Gießverfahren. Dadurch ist gewährleistet, daß die Trägerfläche (20) gut und formschlüssig in die Ausnehmung (18) eingepaßt wird.The subreflector (2) is produced in such a way that that first the two parts (12, 16) are molded, for example by machining or by a corresponding Casting process. This ensures that the support surface (20) well and positively into the recess (18) is fitted.

Sodann wird die Trägerfläche (20) mit der Beschichtung (19) versehen. Dabei kann je nach dem verwendeten Material die Beschichtung beispielsweise als ein Farbmittel aufgetragen werden, d.h. entweder auf die Trägerfläche (20) gespritzt oder mit einem Pinsel aufgetragen werden. Auf diese Weise entsteht die reflektierende Fläche (13), die anschließend in die Ausnehmung (18) des zweiten Teils (16) eingepaßt und mit dieser verbunden wird. Diese Verbindung kann mit Hilfe einer sehr dünnen Kleberschicht vorgenommen werden. Darüberhinaus wird darauf geachtet, daß auch der Kleber das spezifische Gewicht des nicht reflektierenden Materials einerseits und der Beschichtung (19) andererseits besitzt.Then the carrier surface (20) with the coating (19) Mistake. Depending on the material used, the coating can for example applied as a colorant i.e. either sprayed onto the support surface (20) or can be applied with a brush. In this way it is created the reflective surface (13), which is then in the recess (18) of the second part (16) fitted and with this is connected. This connection can be made using a very thin adhesive layer can be made. Furthermore, made sure that the adhesive has the specific weight the non-reflective material on the one hand and the coating (19) on the other hand.

Sodann wird in der sich durch den Zylinder (14) erstreckenden Achse (23) eine Befestigung am ersten Teil (12) vorgesehen, mit der die Antriebswelle (21) des Motors (3) verbunden wird. Dabei können entsprechende Kupplungsstücke mit dem zweiten Teil (12) des Zylinders (14) verbunden werden.Then in the extending through the cylinder (14) Axis (23) is provided on the first part (12), with which the drive shaft (21) of the motor (3) is connected. Corresponding coupling pieces can be used with the second Part (12) of the cylinder (14) are connected.

Claims (12)

Reflektorantenne mit einem Hauptreflektor, vor dem in Richtung einfallender Strahlen ein mit einer reflektierenden Fläche versehener Subreflektor drehbar angeordnet ist, dadurch gekennzeichnet, daß der Subreflektor (2) eine in Richtung einer Hauptachse (22) des Hauptreflektors (1) verlaufende Zylinderachse (23) aufweist, auf der der Subreflektor (2) mit einer hohen Drehzahl von etwa 1500 bis etwa 3500 U/min drehbar gelagert ist.Reflector antenna with a main reflector, in front of the Direction of incident rays with a reflecting one Surface provided subreflector is rotatably arranged, thereby characterized in that the sub-reflector (2) in the direction of a Main axis (22) of the main reflector (1) extending cylinder axis (23) on which the subreflector (2) with a high speed of about 1500 to about 3500 rpm rotatably mounted is. Reflektorantenne nach Anspruch 1, dadurch gekennzeichnet, daß der Subreflektor (2) auf der Zylinderachse (23) frei von Vibrationen gelagert ist.Reflector antenna according to claim 1, characterized in that the sub-reflector (2) on the cylinder axis (23) free of Vibrations is stored. Reflektorantenne nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Subreflektor (2) als ein Drehkörper frei von Unwuchten ist.Reflector antenna according to claim 1 or 2, characterized in that the sub-reflector (2) as a rotating body free of Is unbalance. Reflektorantenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Drehkörper aus einer Strahlen nicht reflektierenden Masse besteht, in die eine reflektierende Fläche (13) eingebettet ist.Reflector antenna according to one of claims 1 to 3, characterized characterized in that the rotating body does not blast reflective mass, in which a reflective surface (13) is embedded. Reflektorantenne nach Anspruch 4, dadurch gekennzeichnet, daß die Masse in Form eines Zylinders (14) geformt ist, der aus zwei miteinander verbundenen Teilen besteht, von denen das eine an seinem dem anderen zugewandten Ende die reflektierende Fläche (13) aufweist, in die das Ende des anderen Teils (16) formschlüssig hineinpaßt.Reflector antenna according to claim 4, characterized in that the mass is shaped in the form of a cylinder (14), the consists of two interconnected parts, of which the one at its other end, the reflective one Surface (13) into which the end of the other part (16) fits positively. Reflektorantenne nach Anspruch 5, dadurch gekennzeichnet, daß die reflektierende Fläche (13) einen hyperbolischen Querschnitt aufweist, die in eine parabolische Ausnehmung (18) des anderen Teils (16) hineinragt. Reflector antenna according to claim 5, characterized in that the reflective surface (13) has a hyperbolic cross section has in a parabolic recess (18) of the other part (16) protrudes. Reflektorantenne nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß zur Ausbildung der reflektierenden Fläche (13) eine reflektierende Beschichtung (19) auf die nicht reflektierte Masse aufgebracht ist.Reflector antenna according to one of claims 1 to 6, characterized characterized in that to form the reflective surface (13) a reflective coating (19) on the non-reflective Mass is applied. Reflektorantenne nach Anspruch 7, dadurch gekennzeichnet, daß die reflektierende Schicht (13) aus einer Farbschicht besteht.Reflector antenna according to claim 7, characterized in that the reflective layer (13) consists of a color layer. Reflektorantenne nach Anspruch 7, dadurch gekennzeichnet, daß die reflektierende Schicht (13) aus einer Aluminiumschicht besteht.Reflector antenna according to claim 7, characterized in that the reflective layer (13) from an aluminum layer consists. Reflektorantenne nach Anspruch 9, dadurch gekennzeichnet, daß die Aluminiumschicht auf die nicht reflektierende Masse aufgedampft ist.Reflector antenna according to claim 9, characterized in that the aluminum layer on the non-reflective mass has evaporated. Reflektorantenne nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, daß die reflektierende Schicht (13) dasselbe spezifische Gewicht wie die nicht reflektierende Schicht besitzt.Reflector antenna according to one of claims 7 to 10, characterized characterized in that the reflective layer (13) is the same specific gravity like the non-reflective layer owns. Verfahren zum Herstellen eines Reflektors für eine Reflektorantenne, dadurch gekennzeichnet, daß zwei im wesentlichen zylindrische Teilstücke (12, 16) aus einer nichtreflektierenden Masse hergestellt werden, von denen das eine einerseits von einer Kreisfläche (15) und andererseits von einer hyperbolischen Fläche begrenzt ist, die mit einer reflektierenden Beschichtung (19) beschichtet wird, und das andere einerseits von einer Kreisfläche (17) und andererseits von einer parabolischen Fläche begrenzt ist, in die die hyperbolische Fläche eingepaßt und mit der die hyperbolische Fläche fest verbunden wird.Method of manufacturing a reflector for a reflector antenna, characterized in that two essentially cylindrical sections (12, 16) made of a non-reflective Mass produced, one of which is one hand of a circular area (15) and on the other hand of a hyperbolic Area is limited with a reflective coating (19) is coated, and the other one hand of a circular area (17) and on the other hand of a parabolic Area is limited in which the hyperbolic area fitted and with which the hyperbolic surface is firmly connected becomes.
EP00250367A 1999-11-02 2000-11-02 Reflector antenna and method of fabricating a subreflector Withdrawn EP1098393A3 (en)

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