EP0063063A1 - Microwave antenna comprising a mirror and a support, and linking device between mirror and support - Google Patents

Microwave antenna comprising a mirror and a support, and linking device between mirror and support Download PDF

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Publication number
EP0063063A1
EP0063063A1 EP82400508A EP82400508A EP0063063A1 EP 0063063 A1 EP0063063 A1 EP 0063063A1 EP 82400508 A EP82400508 A EP 82400508A EP 82400508 A EP82400508 A EP 82400508A EP 0063063 A1 EP0063063 A1 EP 0063063A1
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EP
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Prior art keywords
mirror
rigid
reference point
plane
support
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EP82400508A
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German (de)
French (fr)
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EP0063063B1 (en
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Jean Georgel
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Thales SA
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Thomson CSF SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal

Definitions

  • Aerials made up of a shell of which a face called a mirror serves as a radiating or reflecting surface and of a rigid structure reproducing the general shape of the mirror are commonly used in many techniques using the transmission by hertzian waves such as for example in telecommunications, radar systems, etc.
  • the plastic shell possibly loaded, generally cellular, the mirror surface being metallized.
  • the mirror is fixed to the rigid support by screwed or glued anchors so as to guarantee a rigid connection between the mirror and its support, in order to ensure the rigidity of the support.
  • the performance of the aerial is mainly determined by the surface of the mirror. It must reproduce, with the smallest tolerances, the theoretical surface defined by the desired characteristics of the aerial. It is customary, for this purpose, to ensure a rigid fixing of the shell on its support.
  • the front structure, forming the reflecting mirror to be constituted by a sandwich panel with resin glass skins
  • the rear support to be constituted by a different structure, in the form of lattice of metal tubes or profiles or in a box of aluminum or steel sheets.
  • the expansions of the front and rear structures are never exactly the same, either because, under the effect of sunlight, the temperature of the opaque and insulating front face is different from the rear structure, or because, even at equal temperatures, the expansion coefficients of aluminum, steel and resin glass laminates are not the same.
  • the connecting elements are acted on so that the stresses brought about by thermal expansions are zero or negligible, thereby eliminating the deformations of the mirror.
  • an aerial comprising a mirror and a support having a different coefficient of expansion made integral by connecting elements, is characterized in that one of the connecting elements, located at the reference point of the mirror is rigid according to all direction and that the other connecting elements are rigid in a first direction merged with the normal to the mirror at the point of fixation considered and flexible in at least a second direction, to the first, in the direction of the relative expansion at this point relative to to support.
  • the aim of the present invention is to remedy in an aerial the deformations of the mirror rigidly fixed to a support, deformations generally due to a difference in expansion of the mirror and of the support, under the effect of a warm-up. It has been indicated that at least one of the connecting elements between the mirror and its support is completely rigid, that situated at the so-called reference point of the surface of the mirror. To give a definition to the reference point, one can consider two classes of aerial structures subject to the invention: structures of revolution and structures having a plane of symmetry.
  • the reference point coincides with the vertex of the mirror
  • the reference point is that, located in the plane of symmetry, at the top of the section cut in the mirror by this plane of symmetry. This point then is not necessarily the middle of the surface of the mirror.
  • Figure 1 shows an aerial structure of revolution, seen in the front and in lb, lc profile in two variants.
  • the connecting element connecting the reference point 3 to the support is rigid in all directions, it can be an axis, or a flange as shown in Figure lc, when an opening 6 is arranged at the top of the mirror , for example to allow passage to a feeding guide from a microwave source in the case of a radar.
  • the connection at point 3 being completely rigid, it is necessary to avoid that, under the effect of constraints, the mirror turns on itself relative to this fixed point and that it undergoes at the other connection points to be provided between the mirror and the support of the constraints which would cause deformations of the mirror.
  • the mirror must be able to expand along the rays of the surface of revolution; it will be noted that these expansions are increasing from the reference point.
  • the connecting elements, to be provided, other than that fixed at the reference point are therefore flexible in the direction of the rays and rigid in the tangential direction and along the normal to the profile of the mirror.
  • Figure 2 gives a semi-rigid connecting element, capable of meeting the conditions set out above.
  • This element is in the form of a flexible blade s of thickness e small compared to its length, in a ratio which can be between 1/5 and 1/15 and rigid along its axis and in the direction perpendicular to l 'axis and thickness.
  • This blade has at its ends two ends 7 and 8 for fixing it to the mirror and to the support at the point considered. This fixing can be done by anchoring or gluing. The number of fixing points depends on the dimensions of the structure and the forces it has to bear.
  • Figure 3 gives another example of a semi-rigid blade usable.
  • the blade 6 is thicker than that of Figure 2, so will have less flexibility depending on its thickness. However, so that sufficient flexibility can be obtained, a groove 9 and 10 is provided towards each of its ends.
  • Figure 4 shows a third example of a semi-rigid blade that can be used.
  • the body of the blade which is thicker than in the example in FIG. 2, has recesses 11 and 12 towards the ends, leaving only a tongue 13, 14 leaving the blade remaining, ensuring the degree of flexibility sufficient not to thwart the expansion of the mirror at the point considered.
  • Figure 5 shows, front view, an aerial structure having a plane of symmetry, here vertical OY. Points 15 and 16 arbitrarily grouped in two rows, one of which is located in the plane OX perpendicular to the plane of symmetry OY passing through the reference point, are assumed to be associated with rigid connecting elements. The expansion of the mirror in this case is counteracted and the mirror 1 deforms, as shown in FIG. 6 showing in plan the structure of FIG. 5.
  • FIG. 7 represents a front view of an aerial structure with a plane of symmetry, the connecting elements of which are in accordance with the invention.
  • the point bearing the reference 3 which is also the origin of the OX trace is the reference point and the connecting element which fixes it to the support is rigid in any direction, as was the connecting element at this point of a structure of revolution.
  • the other connections are flexible, according to the invention, in at least one direction. In the plane OX perpendicular to the plane of symmetry at the reference point, it can be seen that the expansions are exerted from the reference point in the direction X or X ', as shown by the arrows dl, d2, of 1, d '2.
  • the connecting elements (h) will therefore be flexible in these directions OX, OX 'and the blades used will then be arranged perpendicular to rement to trace XX 'and will be rigid in the direction OY and normal to the profile of the mirror. It will be noted that at the other points considered in row 16 for example, the expansions will be exerted in a direction connecting the reference point to the point considered, as shown by the oriented segments fl, f2 ... f'l, f ' 2.
  • the connecting elements g are at these flexible points in at least one direction, that is to say in the plane tangent to the mirror at the point considered and rigid along the perpendicular to this point to avoid rotation of the mirror.
  • the orientation of the semi-rigid elements g used must be determined appropriately, it is substantially perpendicular to the direction of expansion at the point considered.
  • FIG. 8 shows another example of a connecting element which can be used more particularly at points 16 of a structure with a plane of symmetry.
  • This element consists of a rod 17 having a groove 18, 19 at each of its ends leaving two end pieces 20-21 for fixing.
  • This rod is such that it has sufficient flexibility in bending, at its ends, while being rigid along its axis.
  • An aerial mounting has thus been described, more particularly the mounting and fixing of a mirror on its rigid, aerial support which can be used with a radar, or a telecommunications installation, including space telecommunications.

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

Abstract

Aérien hyperfréquence comportant un miroir (1) constitué par une coquille dont une face est métallisée et un support (2) constitué par un treillis métallique avec des éléments de liaison (4, g, h) fixant le miroir à son support. Les coefficients de dilatation du miroir (1) et du support (2) étant différents, pour éviter une déformation du miroir un élément de liaison (5) situé au point de référence (3), qui, pour une structure de révolution est confondu avec le sommet, est rigide suivant toute direction, tandis que les autres éléments de liaison (4, g, h), sont semi-rigides, assurant une certaine souplesse dans le sens de la dilatation (d-f) aux points de fixation considérés. Application aux aériens de systèmes radar de télécommunication et télécommunications spatiales.Microwave aerial comprising a mirror (1) constituted by a shell of which one face is metallized and a support (2) constituted by a metal mesh with connecting elements (4, g, h) fixing the mirror to its support. The expansion coefficients of the mirror (1) and of the support (2) being different, to avoid deformation of the mirror, a connecting element (5) located at the reference point (3), which, for a structure of revolution, is confused with the top is rigid in any direction, while the other connecting elements (4, g, h) are semi-rigid, ensuring a certain flexibility in the direction of expansion (df) at the fixing points considered. Application to aerial of telecommunication and space telecommunications radar systems.

Description

Des aériens constitués d'une coquille dont une face appelée miroir sert de surface rayonnante ou réfléchissante et d'une structure rigide reproduisant la forme générale du miroir sont couramment utilisés dans de nombreuses techniques utilisant la transmission par ondes hertziennes comme par exemple dans les télécommunications, les systèmes radar, etc.Aerials made up of a shell of which a face called a mirror serves as a radiating or reflecting surface and of a rigid structure reproducing the general shape of the mirror are commonly used in many techniques using the transmission by hertzian waves such as for example in telecommunications, radar systems, etc.

Dans le but de faciliter l'installation de tels aériens et d'en réduire le coût, il est courant de réaliser la coquille en matière plastique, éventuellement chargée, généralement alvéolaire, la surface miroir étant métallisée. Le miroir est fixé sur le support rigide par des ancrages vissés ou collés de façon à garantir une liaison rigide entre le miroir et son support, afin d'assurer à l'ensemble la rigidité du support. Il est en effet connu que les performances de l'aérien sont principalement déterminées par la surface du miroir. Elle doit reproduire, avec les tolérances les plus faibles, la surface théorique définie par les caractéristiques recherchées de l'aérien. Il est d'usage, dans ce but, d'assurer une fixation rigide de la coquille sur son support.In order to facilitate the installation of such aerials and reduce the cost, it is common to make the plastic shell, possibly loaded, generally cellular, the mirror surface being metallized. The mirror is fixed to the rigid support by screwed or glued anchors so as to guarantee a rigid connection between the mirror and its support, in order to ensure the rigidity of the support. It is in fact known that the performance of the aerial is mainly determined by the surface of the mirror. It must reproduce, with the smallest tolerances, the theoretical surface defined by the desired characteristics of the aerial. It is customary, for this purpose, to ensure a rigid fixing of the shell on its support.

Dans la conception des réflecteurs d'antennes radars, il est courant que la structure avant, formant le miroir réfléchissant, soit constituée par un panneau sandwich avec peaux en verre résine, et que le support arrière soit constitué d'une structure différente, en forme de treillis de tubes ou profilés métalliques ou en caisson de tôles d'aluminium ou d'acier.In the design of radar antenna reflectors, it is common for the front structure, forming the reflecting mirror, to be constituted by a sandwich panel with resin glass skins, and for the rear support to be constituted by a different structure, in the form of lattice of metal tubes or profiles or in a box of aluminum or steel sheets.

La liaison habituelle entre ces deux structures est obtenue par des ancrages rigides vissés ou collés.The usual connection between these two structures is obtained by rigid screwed or glued anchors.

Les dilatations des structures avant et arrière ne sont jamais rigoureusement les mêmes, soit parce que, sous l'effet de l'ensoleillement, la température de la face avant, opaque et isolante, est différente de la structure arrière, soit parce que, même à températures égales, les coefficients de dilatation de l'aluminium, de l'acier et des stratifiés en verre résine ne sont pas les mêmes.The expansions of the front and rear structures are never exactly the same, either because, under the effect of sunlight, the temperature of the opaque and insulating front face is different from the rear structure, or because, even at equal temperatures, the expansion coefficients of aluminum, steel and resin glass laminates are not the same.

Sous l'influence de ces dilatations, des contraintes apparaissent au niveau des éléments de liaison entre les structures avant et arrière, ayant pour effet d'amener des déformations du miroir préjudiciables à un bon fonctionnement du radar, surtout quand les performances radioélectriques recherchées exigent une qualité de forme du miroir très rigoureuse.Under the influence of these expansions, constraints appear at the level of the elements of connection between the front and rear structures, having the effect of causing deformations of the mirror detrimental to a good functioning of the radar, especially when the desired radioelectric performances require a very rigorous quality of shape of the mirror.

Suivant l'invention on agit sur les éléments de liaison de sorte que les contraintes amenées par les dilatations thermiques sont nulles ou négligeables, supprimant, de ce fait, les déformations du miroir.According to the invention, the connecting elements are acted on so that the stresses brought about by thermal expansions are zero or negligible, thereby eliminating the deformations of the mirror.

Suivant l'invention, un aérien comportant un miroir et un support présentant un coefficient de dilatation différent rendus solidaires par des éléments de liaison, est caractérisé en ce qu'un des éléments de liaison, situé au point de référence du miroir est rigide suivant toute direction et que les autres éléments de liaison sont rigides dans une première direction confondue avec la normale au miroir au point de fixation considéré et souples dans au moins une deuxième direction, à la première, dans le sens de la dilatation relative en ce point par rapport au support.According to the invention, an aerial comprising a mirror and a support having a different coefficient of expansion made integral by connecting elements, is characterized in that one of the connecting elements, located at the reference point of the mirror is rigid according to all direction and that the other connecting elements are rigid in a first direction merged with the normal to the mirror at the point of fixation considered and flexible in at least a second direction, to the first, in the direction of the relative expansion at this point relative to to support.

L'avantage essentiel résultant de l'utilisation d'éléments de liaison appelés semi-rigides et qui répondent aux conditions qui viennent d'être énoncées se résume en ce qu'ils assurent une liaison "d'ensemble rigide et bien définie entre la coquille et son support tout en permettant une libre dilatation du miroir par rapport au support. On supprime ainsi toute déformation du miroir résultant de contraintes dues à une variation de température en cours de fonctionnement. En effet, la rigidité suivant la normale à la surface et l'ancrage rigide en un point de référence garantissent le maintien de la forme géométrique de la surface. La souplesse suivant au moins une direction tangente à la surface permet une dilatation de la surface au sens mathématique du terme sans provoquer de déformation de la surface et éviter de ce fait toute perturbation radioélectrique.The essential advantage resulting from the use of connecting elements called semi-rigid and which meet the conditions which have just been stated is summed up in that they ensure a connection "rigid and well defined assembly between the shell and its support while allowing a free expansion of the mirror with respect to the support. This eliminates any deformation of the mirror resulting from stresses due to a temperature variation during operation. Indeed, the rigidity according to normal to the surface and the rigid anchoring at a reference point guarantees the geometry of the surface is maintained. The flexibility in at least one direction tangent to the surface allows the surface to expand in the mathematical sense of the term without causing deformation of the surface and avoiding therefore any radio interference.

L'invention sera bien comprise en se reportant à la description suivante et aux figures qui l'accompagnent dans lesquelles :

  • - la figure 1 est une structure d'aérien de révolution suivant l'invention, vue de face (a) et de profil en deux variantes (b) et (c) ;
  • - la figure 2 est un élément de liaison semi-rigide utilisé selon l'invention ;
  • - les figures 3 et 4 sont deux autres variantes d'un élément de liaison semi-rigide utilisé selon l'invention ;
  • - la figure 5 est une vue de face d'une structure d'aérien présentant un plan de symétrie ;
  • - la figure 6 est une vue de profil de la structure de la figure 5 montrant la déformation du miroir ;
  • - la figure 7 est une vue de face d'une structure d'aérien à plan de symétrie, équipé d'éléments de liaison selon l'invention ;
  • - la figure 8 est une quatrième variante d'un élément de liaison selon l'invention.
The invention will be better understood by referring to the following description and to the accompanying figures in which:
  • - Figure 1 is an aerial structure of revolution according to the invention, front view (a) and in profile in two variants (b) and (c);
  • - Figure 2 is a semi-rigid connecting element used according to the invention;
  • - Figures 3 and 4 are two other variants of a semi-rigid connecting element used according to the invention;
  • - Figure 5 is a front view of an aerial structure having a plane of symmetry;
  • - Figure 6 is a side view of the structure of Figure 5 showing the deformation of the mirror;
  • - Figure 7 is a front view of an aerial structure with a plane of symmetry, equipped with connecting elements according to the invention;
  • - Figure 8 is a fourth variant of a connecting element according to the invention.

Dans la partie introduction de la demande, on a exposé le but de la présente invention qui est de remédier dans un aérien aux déformations du miroir fixé rigidement à un support, déformations généralement dues à une différence de dilatation du miroir et du support, sous l'effet d'un échauffement. On a indiqué qu'un au moins des éléments de liaison entre le miroir et son support était totalement rigide, celui situé au point dit de référence de la surface du miroir. Pour donner une définition au point de référence, on peut envisager deux classes de structures d'aériens justiciables de l'invention : les structures de révolution et les structures présentant un plan de symétrie. Dans le cas d'une structure de révolution le point de référence coïncide avec le sommet du miroir, dans le cas d'une strucure à plan de symétrie le point de référence est celui, situé dans le plan de symétrie, au sommet de la section découpée dans le miroir par ce plan de symétrie. Ce point alors n'est pas forcément le milieu de la surface du miroir.In the introduction part of the application, the aim of the present invention has been explained, which is to remedy in an aerial the deformations of the mirror rigidly fixed to a support, deformations generally due to a difference in expansion of the mirror and of the support, under the effect of a warm-up. It has been indicated that at least one of the connecting elements between the mirror and its support is completely rigid, that situated at the so-called reference point of the surface of the mirror. To give a definition to the reference point, one can consider two classes of aerial structures subject to the invention: structures of revolution and structures having a plane of symmetry. In the case of a structure of revolution the reference point coincides with the vertex of the mirror, in the case of a structure with a plane of symmetry the reference point is that, located in the plane of symmetry, at the top of the section cut in the mirror by this plane of symmetry. This point then is not necessarily the middle of the surface of the mirror.

La figure 1 représente une structure d'aérien de révolution, vue en la de face et en lb, lc de profil en deux variantes.Figure 1 shows an aerial structure of revolution, seen in the front and in lb, lc profile in two variants.

On reconnaît en 1 la coquille dont une des faces, celle tournée vers la gauche sur les figures lb et lc, est métallisée et constitue le miroir. Cette coquille est montée sur une structure rigide en treillis 2, par l'intermédiaire d'éléments de liaison 5. En 3 est figuré le point de référence, qui dans le cas de la figure 1 se rapportant à une structure de révolution est le sommet du miroir 1.We recognize in 1 the shell of which one of the faces, that turned to the left in Figures 1b and 1c, is metallized and constitutes the mirror. This shell is mounted on a rigid lattice structure 2, by means of connecting elements 5. In 3 is shown the reference point, which in the case of FIG. 1 relating to a structure of revolution is the top of the mirror 1.

Suivant l'invention, l'élément de liaison reliant le point de référence 3 au support est rigide dans toutes les directions, ce peut être un axe, ou une bride comme représenté figure lc, lorsqu'une ouverture 6 est disposée au sommet du miroir, par exemple pour laisser le passage à un guide d'alimentation d'une source hyperfréquence dans le cas d'un radar. La liaison au point 3 étant totalement rigide, il faut éviter que, sous l'effet de contraintes, le miroir tourne sur lui-même par rapport à ce point fixe et qu'il subisse aux autres points de liaison à prévoir entre le miroir et le support des contraintes qui provoqueraient des déformations du miroir. II faut cependant, suivant l'invention que le miroir puisse se dilater suivant les rayons de la surface de révolution ; on notera que ces dilatations sont croissantes en partant du point de référence. Les éléments de liaison, à prévoir, autre que celui fixé au point de référence sont donc souples suivant la direction des rayons et rigides suivant la direction tangentielle et suivant la normale au profil du miroir.According to the invention, the connecting element connecting the reference point 3 to the support is rigid in all directions, it can be an axis, or a flange as shown in Figure lc, when an opening 6 is arranged at the top of the mirror , for example to allow passage to a feeding guide from a microwave source in the case of a radar. The connection at point 3 being completely rigid, it is necessary to avoid that, under the effect of constraints, the mirror turns on itself relative to this fixed point and that it undergoes at the other connection points to be provided between the mirror and the support of the constraints which would cause deformations of the mirror. However, according to the invention, the mirror must be able to expand along the rays of the surface of revolution; it will be noted that these expansions are increasing from the reference point. The connecting elements, to be provided, other than that fixed at the reference point are therefore flexible in the direction of the rays and rigid in the tangential direction and along the normal to the profile of the mirror.

La figure 2 donne un élément de liaison semi-rigide, capable de répondre aux conditions exposées ci-dessus. Cet élément se présente sous la forme d'une lame souple s d'épaisseur e faible par rapport à sa longueur, dans un rapport pouvant être compris entre 1/5 et 1/15 et rigide suivant son axe et suivant la direction perpendiculaire à l'axe et à l'épaisseur. Cette lame comporte à ses extrémités deux embouts 7 et 8 permettant de la fixer au miroir et au support au point considéré. Cette fixation peut se faire par ancrage ou collage. Le nombre des points de fixation dépend des dimensions de la structure et des efforts qu'elle doit supporter.Figure 2 gives a semi-rigid connecting element, capable of meeting the conditions set out above. This element is in the form of a flexible blade s of thickness e small compared to its length, in a ratio which can be between 1/5 and 1/15 and rigid along its axis and in the direction perpendicular to l 'axis and thickness. This blade has at its ends two ends 7 and 8 for fixing it to the mirror and to the support at the point considered. This fixing can be done by anchoring or gluing. The number of fixing points depends on the dimensions of the structure and the forces it has to bear.

La figure 3 donne un autre exemple de lame semi-rigide utilisable. La lame 6 est plus épaisse que celle de la figure 2, donc présentera une souplesse moins grande suivant son épaisseur. Toutefois, pour qu'une souplesse suffisante puisse être obtenue, on ménage vers chacune de ses extrémités une gorge 9 et 10.Figure 3 gives another example of a semi-rigid blade usable. The blade 6 is thicker than that of Figure 2, so will have less flexibility depending on its thickness. However, so that sufficient flexibility can be obtained, a groove 9 and 10 is provided towards each of its ends.

La figure 4 montre un troisième exemple de lame semi-rigide utilisable. Le corps de la lame, plus épais que dans l'exemple de la figure 2 présente des évidements 11 et 12 vers les extrémités, ne laissant subsister de la lame qu'une languette 13, 14 assurant le degré de souplesse suffisant pour ne pas contrarier la dilatation du miroir au point considéré.Figure 4 shows a third example of a semi-rigid blade that can be used. The body of the blade, which is thicker than in the example in FIG. 2, has recesses 11 and 12 towards the ends, leaving only a tongue 13, 14 leaving the blade remaining, ensuring the degree of flexibility sufficient not to thwart the expansion of the mirror at the point considered.

La figure 5 montre, vue de face, une structure d'aérien présentant un plan de symétrie, ici vertical OY. Les points 15 et 16 groupés de façon arbitraire suivant deux rangées, dont l'une est située dans le plan OX perpendiculaire au plan de symétrie OY passant par le point de référence, sont supposés associés à des éléments de liaison rigides. La dilatation du miroir dans ce cas est contrariée et le miroir 1 se déforme, comme le montre la figure 6 représentant en plan la structure de la figure 5.Figure 5 shows, front view, an aerial structure having a plane of symmetry, here vertical OY. Points 15 and 16 arbitrarily grouped in two rows, one of which is located in the plane OX perpendicular to the plane of symmetry OY passing through the reference point, are assumed to be associated with rigid connecting elements. The expansion of the mirror in this case is counteracted and the mirror 1 deforms, as shown in FIG. 6 showing in plan the structure of FIG. 5.

Suivant l'invention, ces déformations sont supprimées quand les liaisons, autre que celle associée au point de référence, sont semi-rigides.According to the invention, these deformations are eliminated when the links, other than that associated with the reference point, are semi-rigid.

La figure 7 représente, vue de face, une structure d'aérien à plan de symétrie dont les éléments de liaison sont conformes à l'invention. Le point portant la référence 3 qui est également l'origine de la trace OX est le point de référence et l'élément de liaison qui la fixe au support est rigide suivant toute direction, comme l'était l'élément de liaison en ce point d'une structure de révolution. Les autres liaisons sont souples, suivant l'invention, suivant au moins une direction. Dans le plan OX perpendiculaire au plan de symétrie au point de référence, on constate que les dilatations s'exercent à partir du point de référence dans la direction X ou X', comme le montrent les flèches dl, d2, d'1, d'2. Les éléments de liaison (h) seront donc souples suivant ces directions OX, OX' et les lames utilisées seront alors disposées perpendiculairement à la trace XX' et seront rigides suivant la direction OY et la normale au profil du miroir. On remarquera qu'aux autres points considérés de la rangée 16 par exemple, les dilatations s'exerceront suivant une direction reliant le point de référence au point considéré, comme le montrent les segments orientés fl, f2 ... f'l, f'2. Les éléments de liaison g sont en ces points souples dans au moins une direction, c'est-à-dire dans le plan tangent au miroir au point considéré et rigides suivant la perpendiculaire à ce point pour éviter la rotation du miroir. L'orientation des éléments semi-rigides g utilisés doit être déterminée de façon appropriée, elle est sensiblement perpendiculaire à la direction de la dilatation au point considéré.FIG. 7 represents a front view of an aerial structure with a plane of symmetry, the connecting elements of which are in accordance with the invention. The point bearing the reference 3 which is also the origin of the OX trace is the reference point and the connecting element which fixes it to the support is rigid in any direction, as was the connecting element at this point of a structure of revolution. The other connections are flexible, according to the invention, in at least one direction. In the plane OX perpendicular to the plane of symmetry at the reference point, it can be seen that the expansions are exerted from the reference point in the direction X or X ', as shown by the arrows dl, d2, of 1, d '2. The connecting elements (h) will therefore be flexible in these directions OX, OX 'and the blades used will then be arranged perpendicular to rement to trace XX 'and will be rigid in the direction OY and normal to the profile of the mirror. It will be noted that at the other points considered in row 16 for example, the expansions will be exerted in a direction connecting the reference point to the point considered, as shown by the oriented segments fl, f2 ... f'l, f ' 2. The connecting elements g are at these flexible points in at least one direction, that is to say in the plane tangent to the mirror at the point considered and rigid along the perpendicular to this point to avoid rotation of the mirror. The orientation of the semi-rigid elements g used must be determined appropriately, it is substantially perpendicular to the direction of expansion at the point considered.

La figure 8 représente un autre exemple d'élément de liaison utilisable plus particulièrement aux points 16 d'une structure à plan de symétrie. Cet élément est constitué par une tige 17 présentant une gorge 18, 19 à chacune de ses extrémités laissant deux embouts 20-21 de fixation. Cette tige est telle qu'elle présente une souplesse suffisante en flexion, à ses extrémités, tout en étant rigide suivant son axe.FIG. 8 shows another example of a connecting element which can be used more particularly at points 16 of a structure with a plane of symmetry. This element consists of a rod 17 having a groove 18, 19 at each of its ends leaving two end pieces 20-21 for fixing. This rod is such that it has sufficient flexibility in bending, at its ends, while being rigid along its axis.

On a ainsi décrit un montage d'aérien, plus particulièrement le montage et la fixation d'un miroir sur son support rigide, aérien pouvant être utilisé avec un radar, ou une installation de télécommunication, y compris télécommunication spatiale.An aerial mounting has thus been described, more particularly the mounting and fixing of a mirror on its rigid, aerial support which can be used with a radar, or a telecommunications installation, including space telecommunications.

Claims (11)

1. Aérien hyperfréquence comportant un miroir (1) et un support (2) présentant un coefficient de dilatation différent, rendus solidaires par des éléments de liaison (5), caractérisé en ce qu'un des éléments de liaison, situé au point de référence (3) du miroir est rigide suivant toute direction et que les autres éléments de liaison (4-g) sont rigides dans une première direction confondue avec la normale au miroir au point de fixation considéré et souples dans au moins une deuxième direction normale à la première et dans le sens de la dilatation relative (d-f) en ce point du miroir par rapport au support.1. Microwave aerial comprising a mirror (1) and a support (2) having a different coefficient of expansion, made integral by connection elements (5), characterized in that one of the connection elements, located at the reference point (3) of the mirror is rigid in any direction and that the other connecting elements (4-g) are rigid in a first direction coincident with the normal to the mirror at the point of attachment considered and flexible in at least a second direction normal to the first and in the direction of the relative expansion (df) at this point of the mirror with respect to the support. 2. Aérien hyperfréquence selon la revendication 1, caractérisé en ce que pour une structure de révolution, le point de référence (3) étant le sommet du miroir les éléments de liaison (4) autre que celui situé au sommet du miroir sont souples suivant la direction des rayons de la structure de révolution et rigides suivant la normale au profil du miroir (1) et tangentiellement, aux points de fixation considérés.2. Microwave aerial according to claim 1, characterized in that for a structure of revolution, the reference point (3) being the top of the mirror the connecting elements (4) other than that located at the top of the mirror are flexible depending on the direction of the rays of the structure of revolution and rigid according to the normal to the profile of the mirror (1) and tangentially, to the fixing points considered. 3. Aérien hyperfréquence selon la revendication 1, caractérisé en ce que pour une structure à plan de symétrie, le point de référence (3) étant le sommet de la section découpée dans le miroir (1) par le plan de symétrie (OY).Les éléments de liaison (h), autres que celui situé au point de référence (3), mais situé dans un plan (OX) perpendiculaire au plan de symétrie (OY) et passant par le point de référence (3) sont souples suivant cette direction perpendiculaire (OX) et rigidessuivant la direction (OY) et suivant la direction normale au profil du miroir.3. Microwave aerial according to claim 1, characterized in that for a structure with a plane of symmetry, the reference point (3) being the top of the section cut out in the mirror (1) by the plane of symmetry (OY). The connecting elements (h), other than that located at the reference point (3), but located in a plane (OX) perpendicular to the plane of symmetry (OY) and passing through the reference point (3) are flexible according to this perpendicular (OX) and rigid direction following the direction (OY) and in the direction normal to the profile of the mirror. 4. Aérien hyperfréquence selon la revendication 3, caractérisé en ce que les éléments de liaison (g) autres que ceux situés dans le plan perpendiculaire (OX) au plan de symétrie (OY) sont souples dans le plan tangent au miroir (1) au point considéré et rigides suivant la normale à ce plan.4. Microwave aerial according to claim 3, characterized in that the connecting elements (g) other than those located in the plane perpendicular (OX) to the plane of symmetry (OY) are flexible in the plane tangent to the mirror (1) at point considered and rigid according to the normal to this plane. 5. Aérien suivant la revendication 1, caractérisée en ce que l'élément de liaison (5) au point de référence est un axe, ou une bride, au cas où au point de référence, le miroir est percé d'un trou(6) permettant le passage d'un guide d'alimentation d'une source primaire.5. Air according to claim 1, characterized in that the connecting element (5) at the reference point is an axis, or a flange, in case at the reference point, the mirror is pierced with a hole (6 ) allowing the passage of a feed guide from a primary source. 6. Aérien suivant l'une quelconque des revendications 1 à 4 caractérisé en ce qu'un élément de liaison semi-rigide est une lame souple (s) d'épaisseur (e) faible par rapport à sa longueur, rigide suivant son axe et suivant la direction perpendiculaire à l'axe et à l'épaisseur (e), dont les extrémités comportent deux embouts (7-8) pour le fixer au miroir (1) et à la structure (2).6. Air according to any one of claims 1 to 4 characterized in that a semi-rigid connecting element is a flexible blade (s) of thickness (e) small compared to its length, rigid along its axis and in the direction perpendicular to the axis and to the thickness (e), the ends of which have two end caps (7-8) to fix it to the mirror (1) and to the structure (2). 7. Aérien suivant l'une quelconque des revendications 1 à 4 caractérisé en ce qu'un élément de liaison semi-rigide est une lame (figure 3) d'épaisseur (e) relativement grande, présentant à ses extrémités des gorges (9, 10) assurant la souplesse nécessaire.7. Air according to any one of claims 1 to 4 characterized in that a semi-rigid connecting element is a blade (Figure 3) of thickness (e) relatively large, having at its ends grooves (9, 10) ensuring the necessary flexibility. 8. Aérien suivant l'une quelconque des revendications 1 à 4 caractérisé en ce qu'un élément de liaison semi-rigide est une lame (figure 4) aux extrémités de laquelle on a ménagé des encoches (11- 12) laissant subsister des languettes (13-14) assurant la souplesse nécessaire.8. Air according to any one of claims 1 to 4 characterized in that a semi-rigid connecting element is a blade (Figure 4) at the ends of which there have been provided notches (11-12) leaving tabs remaining (13-14) ensuring the necessary flexibility. 9. Aérien suivant l'une quelconque des revendications 1 à 4 caractérisé en ce qu'un élément de liaison semi-rigide est une tige (17 figure 8) souple en flexion, aux extrémités de laquelle sont ménagées des gorges (18-19) assurant la souplesse nécessaire.9. Air according to any one of claims 1 to 4 characterized in that a semi-rigid connecting element is a rod (17 Figure 8) flexible in bending, at the ends of which are formed grooves (18-19) ensuring the necessary flexibility. 10. Aérien selon la revendication 1, caractérisé en ce que le miroir (1) est la face métallisée d'une coquille en stratifié et le support (2) un treillis métallique, rendu solidaire de la coquille par des éléments de liaison semi-rigide (4,h,g), sauf au point de référence (3) où l'élément de liaison est rigide suivant toute direction.10. Air according to claim 1, characterized in that the mirror (1) is the metallized face of a laminate shell and the support (2) a wire mesh, made integral with the shell by semi-rigid connecting elements (4, h, g), except at reference point (3) where the connecting element is rigid in any direction. 11. Elément de liaison, semi-rigide, pour fixer l'un,à lautre deux organes ayant sensiblement une même forme géométrique mais des coefficients de dilatation différents, conformément à l'une des revendications 6,7,8 ou 9.11. connecting element, semi-rigid, for fixing one to the other two members having substantially the same geometric shape but different coefficients of expansion, according to one of claims 6,7,8 or 9.
EP82400508A 1981-04-03 1982-03-19 Microwave antenna comprising a mirror and a support, and linking device between mirror and support Expired EP0063063B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8106768 1981-04-03
FR8106768A FR2503460B1 (en) 1981-04-03 1981-04-03 AERIAL MICROWAVE COMPRISING A MIRROR AND A SUPPORT, AND CONNECTING ELEMENTS FROM A SUPPORT TO A MIRROR

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EP0063063A1 true EP0063063A1 (en) 1982-10-20
EP0063063B1 EP0063063B1 (en) 1986-05-14

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EP82400508A Expired EP0063063B1 (en) 1981-04-03 1982-03-19 Microwave antenna comprising a mirror and a support, and linking device between mirror and support

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US (1) US4484198A (en)
EP (1) EP0063063B1 (en)
DE (1) DE3271109D1 (en)
FR (1) FR2503460B1 (en)

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DE3634196A1 (en) * 1986-10-08 1988-04-21 Zeiss Carl Fa Device for connecting two bodies having different coefficients of thermal expansion
FR2613525A1 (en) * 1987-04-04 1988-10-07 Zeiss Carl Fa DEVICE FOR AS SEAMING PARTS SO AS TO REDUCE THERMAL CONSTRAINTS TO A MINIMUM, ESPECIALLY FOR ASSEMBLING SEGMENTS OF A TELESCOPE MIRROR

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DE4030572A1 (en) * 1990-09-27 1992-04-02 Ant Nachrichtentech DEVICE FOR COMPENSATING THERMAL EXPANSION
US5640950A (en) * 1995-06-13 1997-06-24 Cordy, Jr.; Clifford B. Simplified cradle and dish for a solar powered high-pressure steam generator
DE29603024U1 (en) * 1996-02-21 1996-04-18 Zeiss Carl Fa Stress-free storage
US8860627B2 (en) * 2007-09-24 2014-10-14 Agence Spatiale Europeenne Reconfigurable reflector for electromagnetic waves
US8674893B2 (en) * 2008-03-18 2014-03-18 Astrium Limited Antenna feed assembly
US9680229B2 (en) * 2013-06-28 2017-06-13 The Boeing Company Modular reflector assembly for a reflector antenna

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DE3634196A1 (en) * 1986-10-08 1988-04-21 Zeiss Carl Fa Device for connecting two bodies having different coefficients of thermal expansion
FR2613525A1 (en) * 1987-04-04 1988-10-07 Zeiss Carl Fa DEVICE FOR AS SEAMING PARTS SO AS TO REDUCE THERMAL CONSTRAINTS TO A MINIMUM, ESPECIALLY FOR ASSEMBLING SEGMENTS OF A TELESCOPE MIRROR
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Also Published As

Publication number Publication date
DE3271109D1 (en) 1986-06-19
FR2503460B1 (en) 1985-06-07
FR2503460A1 (en) 1982-10-08
US4484198A (en) 1984-11-20
EP0063063B1 (en) 1986-05-14

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