EP0045254A1 - Compact dual-frequency microwave feed - Google Patents

Compact dual-frequency microwave feed Download PDF

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Publication number
EP0045254A1
EP0045254A1 EP81401185A EP81401185A EP0045254A1 EP 0045254 A1 EP0045254 A1 EP 0045254A1 EP 81401185 A EP81401185 A EP 81401185A EP 81401185 A EP81401185 A EP 81401185A EP 0045254 A1 EP0045254 A1 EP 0045254A1
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Prior art keywords
dual
dipole
band
radiating
source according
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Granted
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EP81401185A
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German (de)
French (fr)
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EP0045254B1 (en
Inventor
Albert Dupressoir
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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
    • H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
    • H01Q25/001—Crossed polarisation dual antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device

Definitions

  • the present invention relates to a compact dual-band radiating source operating in the microwave domain. It can be used as a primary source illuminating a focusing optical system or as a radiating element directly, alone or as part of an array antenna with electronic scanning.
  • a radiating source operating in two distinct frequency bands was constituted by two distinct elementary sources each operating in a band but all associated. both the same reflector made in the form of a dihedral, as shown in FIG. 1.
  • a dipole 1 whose direction of the strands is parallel to the edge 2 of the common dihedral reflector 3, and two other dipoles 4 and 5, located on either side of dipole 1 for reasons of symmetry and whose direction of the strands is perpendicular to that of the strands of dipole 1.
  • Dipole 1 on the one hand and the two dipoles 4 and 5 d on the other hand have crossed polarizations one with respect.
  • the object of the invention is to remedy such drawbacks and to produce a compact radiating source, operating in two distinct frequency bands.
  • this compact dual-band radiating source operating in the microwave domain comprises two radiating source-reflector assemblies, the first assembly being constituted by a system of dipoles tuned to the frequency band whose center frequency is the higher of the two and radiating a determined polarization wave, associated with a semi-transparent reflecting device, the second set being constituted by a system of dipoles radiating a polarization wave crossed by compared to the previous one associated with a fully reflective device, the relative position of these two sets with respect to each other being such that their phase centers are combined.
  • FIGS. 2, 3, 4 and 5 which, in addition to FIG. 1 already described, represent nonlimiting exemplary embodiments of a radiating source bi -strip according to the invention.
  • FIG. 2 represents a dual-band radiating source which comprises two distinct radiating assemblies; the first is a dipole. 6, tuned to the band with the highest central frequency, associated with a semi-transparent reflector device 7 and the second set consists of two dipoles 8 and 9 associated with a second reflector device -10.
  • the dipole 6 radiates a wave of determined polarization. for which the reflector device 7 is transparent but which is reflected by the reflector 10.
  • the dipoles 8 and 9 radiate a wave whose polarization is crossed with respect to the previous one, so that the reflector 7 completely reflects it.
  • the semi-transparent reflector 7 consists of a network of parallel metallic wires 11, the direction of which is perpendicular to that of the strands 12 of the dipole 6, therefore to the polarization of the wave it emits.
  • the reflector 10 is constituted by a network of parallel metallic wires 13 whose direction is parallel to that of the strands 12 of the dipole 6 in order to totally reflect the wave emitted by the latter.
  • this reflector 10 can also be produced by a network of crossed metal wires or by a surface with continuous metallization.
  • the reflector 10 is very structured and the network of wires 13 is produced on a wafer of dielectric material.
  • the latter carries metal inserts 14 used for fixing the source, serves as a plane for laying the dipoles and supports the power divider device integrated in its rear volume.
  • the semi-transparent reflector 7 lets pass the wave radiated by the dipole 6 with which it is associated. ; but in another exemplary embodiment, it will on the contrary be completely reflective for this wave and will allow the wave emitted by the other dipoles to pass and whose polarization is crossed with respect to the first.
  • the semi-transparent reflector must be associated with the system of radiating dipoles tuned on the frequency band whose central frequency is the highest.
  • the semi-transparent reflector device is produced in the form of a dihedral 15, constituted by two planes 16 and 17 having a common edge 18.
  • the dipole associated with this reflector in the form of a dihedral is such that the direction of its strands is parallel to the edge of the dihedral.
  • the wires 21 of the reflector 15 being orthogonal to the direction of the strands 20 of dipole 19, the wave emitted by it passes through the dihedral without reflection, before being reflected on the device reflector 22, which is constituted by a network of parallel wires 23 of direction parallel to that of the strands 20.
  • the relative position of the two radiating source-reflector assemblies makes it possible to make their two phase centers coincide in order to obtain the best conditions of radiation from the source.
  • the volume encompassing the two source-reflector assemblies that is to say comprised between the reflector 22, the plane passing through the outer edges 24 and 25 of the dihedral 15 and parallel to the plane 22 and the four planes perpendicular to each other and to plane 22 can be filled with low density polyurethane foam. It is also possible to add a dielectric radome around this source to further ensure the sealing thereof.
  • the network of parallel metallic wires 21, constituting the semi-transparent reflector 15 in the form of a dihedral, is obtained by the photoengraving process used in the technology for manufacturing printed circuits.
  • the distance between the edge18 of the dihedral and the strands 20 of the dipole 19 is equal to 0.6 ⁇ , ⁇ being the wavelength at the central frequency 1250 MHz and the angle of the dihedral is equal to 90 °.
  • the other two dipoles 30 and 31 are supplied in phase or in phase opposition via an energy distributor of the "6 ⁇ / 4 hybrid ring" type.
  • the flat reflector 22 is constituted by a metallized dielectric plate and the distance which separates it from the strands of the dipoles 30 and 31 is equal to 0.25 ⁇ ', ⁇ ' being the wavelength at the central frequency 1000 MHz.
  • FIG. 4 is shown another exemplary embodiment of the invention, in which the two radiating dipole systems consist only of a single dipole 26 and 27 of each of the two polarizations. To respect the symmetry of the source, necessary to make the two phase centers coincide, these two dipoles must be centered. For this, they are mounted on a single foot 28 common to both but are supplied by two coaxial lines 37 and 38 separate, each connected to one of the strands 39 and 40 of the two dipoles.
  • the shape of the reflectors is arbitrary, in other words the semi-transparent reflector 29 can be in the form of a dihedral or a plane just like the reflector 300, the remarks concerning their relative position being the same as above.
  • FIG. 6 represents another exemplary embodiment of the invention, in which the reflector 41 in the form of a dihedral is placed so that its edge 42 is located behind the plane reflector 43.
  • a dipole 44 whose strands are parallel to the edge 42 and to the plane reflector 43 are associated two dipoles 45 and 46 of cross polarization with respect to that of the dipole 44.
  • the part of the plane reflector 43 located in front of the edge 42 must necessarily be semi- transparent to let pass the wave emitted by one of the two systems of radiating dipoles, that is to say by the dipole 44 in the precise case of this figure.
  • the other part of this reflector like the dihedral reflector 41 itself, can be constituted by solid metal plates or by polarizing networks depending on the desired objective.
  • the polarizing systems constituted by arrays of metal wires can be photo-etched on plates of dielectric material. These networks of wires can also be replaced by more rigid parallel metal blades.
  • the remarks concerning the relative position of the two radiant source-reflector assemblies, their practical realization and the addition of polyurethane foam like that of a radome are also valid in all these cases.
  • a compact dual-band radiating source has thus been described, which can be used as a radiating element directly alone or as part of an antenna with electronic scanning.
  • this source can also illuminate a focusing optical system, the position of which with respect to the two radiating source-reflector assemblies which constitute it is such that the focus of this optical system coincides with their two phase centers.

Abstract

1. Compact double band radiating source operating within the microwave range, formed of a first set comprising a semi-transparent reflector (290) and a source radiating according to a first direction of polarization, this first set operating within the highest frequency band, and a second set comprising a totally reflecting device (301) and a source radiating according to a direction of polarization perpendicular to the direction of polarization of the first set, characterized in that the two reflectors (290 and 301) are of dihedral shape having an angle inferior to 180 degrees, the respective edges (310 and 32) being perpendicular, in that the semi-transparent reflecting device (290) transmits the wave radiated by the source with which it is associated and totally reflecting the wave radiated by the source associated with the totally reflecting device (301), and in that the two sources are formed of dipoles the arms of which are parallel to the edge of the associated dihedron, and the number and positions of which with respect to each other are determined in such a manner that the phase centers of the two sources are coincident (Figure 5).

Description

La présente invention concerne une source rayonnante bi-bande compacte fonctionnant dans le domaine des hyperfréquences. Elle est utilisable comme source primaire éclairant un système optique focalisant ou comme élément rayonnant directement, seul ou en tant qu'élément d'une antenne réseau à balayage électronique.The present invention relates to a compact dual-band radiating source operating in the microwave domain. It can be used as a primary source illuminating a focusing optical system or as a radiating element directly, alone or as part of an array antenna with electronic scanning.

Auparavant, une source rayonnante fonctionnant dans deux bandes de fréquences distinctes était constituée par deux sources élémentaires distinctes fonctionnant chacune dans une bande mais associées toutes. les deux un même réflecteur réalisé en forme de dièdre, comme cela est représenté sur la figure 1. On y voit en effet un dipôle 1 dont la direction des brins est parallèle à l'arête 2 du réflecteur dièdre 3 commun, et deux autres dipôles 4 et 5, situés de part et d'autre du dipôle 1 pour des raisons de symétrie et dont la direction des brins est perpendiculaire à celle des brins du dipôle 1. Le dipôle 1 d'une part et les deux dipôles 4 et 5 d'autre part ont des polarisations croisées l'une par rapport. à l'autre et l'on conçoit aisément que lorsqu'une telle source rayonnante bi-bande doit éclairer un système optique focalisant, un réflecteur parabolique par exemple, les centres de phase des deux ensembles, constitués l'un. par le dipôle 1 et le réflecteur 3 et l'autre par les dipôles 4 et 5 et le réflecteur 3, ne peuvent être confondus tous les deux avec le foyer de ce système optique. Dans ce cas, les phénomènes d'aberration ne permettent pas d'obtenir, d'une telle source bi-bande, le meilleur rayonnement possible.Previously, a radiating source operating in two distinct frequency bands was constituted by two distinct elementary sources each operating in a band but all associated. both the same reflector made in the form of a dihedral, as shown in FIG. 1. There is indeed seen a dipole 1 whose direction of the strands is parallel to the edge 2 of the common dihedral reflector 3, and two other dipoles 4 and 5, located on either side of dipole 1 for reasons of symmetry and whose direction of the strands is perpendicular to that of the strands of dipole 1. Dipole 1 on the one hand and the two dipoles 4 and 5 d on the other hand have crossed polarizations one with respect. to the other and it is easily understood that when such a dual-band radiating source must illuminate a focusing optical system, a parabolic reflector for example, the phase centers of the two sets, formed one. by the dipole 1 and the reflector 3 and the other by the dipoles 4 and 5 and the reflector 3, cannot both be confused with the focus of this optical system. In this case, the aberration phenomena do not make it possible to obtain the best possible radiation from such a dual-band source.

Le but de l'invention est de remédier à de tels inconvénients et de réaliser une source rayonnante compacte, fonctionnant dans deux bandes de fréquences distinctes.The object of the invention is to remedy such drawbacks and to produce a compact radiating source, operating in two distinct frequency bands.

Selon une caractéristique de l'invention, cette source rayonnante bi-bande compacte fonctionnant dans le domaine des hyperfréquences, comporte deux ensembles rayonnants source-réflecteur, le premier ensemble étant constitué par un système de dipôles accordés sur la bande de fréquence dont la fréquence centrale est la plus élevée des deux et rayonnant une onde de polarisation déterminée, associé à un dispositif réflecteur semi-transparent, le second ensemble étant constitué par un système de dipôles rayonnant une onde de polarisation croisée par rapport à la précédente associé à un dispositif totalement réflecteur, la position relative de ces deux ensembles l'un par rapport à l'autre étant telle que leurs centres de phase sont confondus.According to a characteristic of the invention, this compact dual-band radiating source operating in the microwave domain, comprises two radiating source-reflector assemblies, the first assembly being constituted by a system of dipoles tuned to the frequency band whose center frequency is the higher of the two and radiating a determined polarization wave, associated with a semi-transparent reflecting device, the second set being constituted by a system of dipoles radiating a polarization wave crossed by compared to the previous one associated with a fully reflective device, the relative position of these two sets with respect to each other being such that their phase centers are combined.

Le fait que les deux centres de phase des deux ensembles rayonnants source-réflecteur soient confondus apporte une meilleure focalisation de la source et par conséquent de meilleurs caractéristiques de rayonnement.The fact that the two phase centers of the two radiating source-reflector assemblies are combined provides better focusing of the source and consequently better radiation characteristics.

D'autres caractéristiques et avantages de l'invention apparaîtront dans la description qui suit, illustrée par les figures 2, 3, 4 et 5 qui, outre la figure 1 déjà décrite, représentent des exemples de réalisation non limitatifs d'une source rayonnante bi-bande selon l'invention.Other characteristics and advantages of the invention will appear in the description which follows, illustrated by FIGS. 2, 3, 4 and 5 which, in addition to FIG. 1 already described, represent nonlimiting exemplary embodiments of a radiating source bi -strip according to the invention.

La figure 2 représente une source rayonnante bi-bande qui comporte deux ensembles rayonnants distincts ; le premier est constitué par un dipôle. 6, accordé sur la bande dont la fréquence centrale est la plus élevée, associé à un dispositif réflecteur 7 semi-transparent et le second ensemble est constitué par deux dipôles 8 et 9 associés à un second dispositif réflecteur -10. Le dipôle 6 rayonne une onde de polarisation déterminée,. pour laquelle le dispositif réflecteur 7 est transparent mais qui est réfléchie par le réflecteur 10. Par contre les dipôles 8 et 9 rayonnent une onde dont la polarisation est croisée par rapport à la précédente, de sorte que le réflecteur 7 la réfléchit totalement. En réglant la position relative de ces deux ensembles c'est-à-dire en réglant aussi bien la distance D entre les deux réflecteurs 7 et 10 que. la distance d entre les brins des dipôles 6 d'une part et 8 et 9 d'autre part, on peut faire coincider leurs centres de phase de façon à obtenir les caractéristiques de rayonnement optimales.FIG. 2 represents a dual-band radiating source which comprises two distinct radiating assemblies; the first is a dipole. 6, tuned to the band with the highest central frequency, associated with a semi-transparent reflector device 7 and the second set consists of two dipoles 8 and 9 associated with a second reflector device -10. The dipole 6 radiates a wave of determined polarization. for which the reflector device 7 is transparent but which is reflected by the reflector 10. On the other hand the dipoles 8 and 9 radiate a wave whose polarization is crossed with respect to the previous one, so that the reflector 7 completely reflects it. By adjusting the relative position of these two sets, that is to say by adjusting both the distance D between the two reflectors 7 and 10. the distance d between the strands of the dipoles 6 on the one hand and 8 and 9 on the other hand, their phase centers can be made to coincide so as to obtain the optimal radiation characteristics.

Comme le montre la figure 2, le réflecteur semi-transparent 7 est constitué par un réseau de fils métalliques parallèles 11, dont la direction est perpendiculaire à celle des brins 12 du dipôle 6 donc à la polarisation de l'onde qu'il émet. Le réflecteur 10 est constitué par un réseau de fils 13 métalliques parallèles dont la direction est parallèle à celle des brins 12 du dipôle 6 pour réfléchir totalement l'onde émise par ce dernier. Mais ce réflecteur 10 peut aussi être réalisé par un réseau de fils métalliques croisés ou par une surface à métallisation continue.As shown in Figure 2, the semi-transparent reflector 7 consists of a network of parallel metallic wires 11, the direction of which is perpendicular to that of the strands 12 of the dipole 6, therefore to the polarization of the wave it emits. The reflector 10 is constituted by a network of parallel metallic wires 13 whose direction is parallel to that of the strands 12 of the dipole 6 in order to totally reflect the wave emitted by the latter. However, this reflector 10 can also be produced by a network of crossed metal wires or by a surface with continuous metallization.

Pour fixer cette source bi-bande ainsi constituée, sur un support métallique par exemple dans le but de réaliser une antenne à balayage électronique, le réflecteur 10 est très structuré et le réseau de fils 13 est réalisé sur une plaquette de matériau diélectrique. Cette dernière porte des inserts 14 métalliques servant à la fixation de la source, sert de plan de pose aux dipôles et supporte le dispositif diviseur de puissance intégré dans son volume arrière.To fix this dual-band source thus formed, on a metal support for example in order to produce an antenna with electronic scanning, the reflector 10 is very structured and the network of wires 13 is produced on a wafer of dielectric material. The latter carries metal inserts 14 used for fixing the source, serves as a plane for laying the dipoles and supports the power divider device integrated in its rear volume.

Dans le cas de la figure 2, le réflecteur semi-transparent 7 laisse passer l'onde rayonnée par le dipôle 6 auquel il est associé. ; mais dans un autre exemple de réalisation, il sera au contraire totalement réflecteur pour cette onde et laissera passer l'onde émise par les autres dipôles et dont la polarisation est croisée par rapport à la première. Par contre, dans tous les cas, le réflecteur semi-transparent doit être associé au système de dipôles rayonnants accordés sur la bande de fréquences dont la fréquence centrale est la plus élevée.In the case of FIG. 2, the semi-transparent reflector 7 lets pass the wave radiated by the dipole 6 with which it is associated. ; but in another exemplary embodiment, it will on the contrary be completely reflective for this wave and will allow the wave emitted by the other dipoles to pass and whose polarization is crossed with respect to the first. On the other hand, in all cases, the semi-transparent reflector must be associated with the system of radiating dipoles tuned on the frequency band whose central frequency is the highest.

Sur la figure 3, le dispositif réflecteur semi-transparent est réalisé en forme de dièdre 15, constitué par deux plans 16 et 17 possédant une arête commune 18. Pour des raisons de rayonnement optimal, le dipôle associé à ce réflecteur en forme de dièdre est tel que la direction de ses brins est parallèle à l'arête du dièdre. Ainsi, sur la figure 3, c'est le dipôle 19 qui est associé au réflecteur semi-transparent 15, ses brins 20 étant parallèles à l'arête 18 du dièdre 15. Les fils 21 du réflecteur 15 étant orthogonaux à la direction des brins 20 du dipôle 19, l'onde émise par celui-ci passe à travers le dièdre sans réflection, avant de se réfléchir sur le dispositif réflecteur 22, qui est constitué par un réseau de fils parallèles 23 de direction parallèle à celle des brins 20. Comme précédemment, la position relative des deux ensembles rayonnants source-réflecteur permet de faire coïncider leurs deux centres de phase pour obtenir les meilleurs conditions de rayonnement de la source.In FIG. 3, the semi-transparent reflector device is produced in the form of a dihedral 15, constituted by two planes 16 and 17 having a common edge 18. For reasons of optimal radiation, the dipole associated with this reflector in the form of a dihedral is such that the direction of its strands is parallel to the edge of the dihedral. Thus, in FIG. 3, it is the dipole 19 which is associated with the semi-transparent reflector 15, its strands 20 being parallel to the edge 18 of the dihedron 15. The wires 21 of the reflector 15 being orthogonal to the direction of the strands 20 of dipole 19, the wave emitted by it passes through the dihedral without reflection, before being reflected on the device reflector 22, which is constituted by a network of parallel wires 23 of direction parallel to that of the strands 20. As previously, the relative position of the two radiating source-reflector assemblies makes it possible to make their two phase centers coincide in order to obtain the best conditions of radiation from the source.

Pour des raisons de tenue mécanique le volume englobant les deux ensembles source-réflecteur c'est-à-dire compris entre le réflecteur 22, le plan passant par les arêtes extérieures 24 et 25 du dièdre 15 et parallèle au plan 22 et les quatre plans perpendiculaires entre eux et au plan 22 peut être rempli de mousse de polyuréthane à faible densité. On peut également ajouter un radome diélectrique autour de cette source pour en assurer en plus l'étanchéité.For reasons of mechanical strength, the volume encompassing the two source-reflector assemblies, that is to say comprised between the reflector 22, the plane passing through the outer edges 24 and 25 of the dihedral 15 and parallel to the plane 22 and the four planes perpendicular to each other and to plane 22 can be filled with low density polyurethane foam. It is also possible to add a dielectric radome around this source to further ensure the sealing thereof.

Une application particulière du mode de réalisation décrit sur la figure 3 a été réalisé pour une source rayonnante devant fonctionner dans deux bandes de fréquences distinctes centrées sur 1000 MHz et 1250 MHz. Le réseau de fils métalliques parallèles 21, constituant le réflecteur semi-transparent 15 en forme de dièdre, est obtenu par le procédé de photogravure utilisé dans la technologie de fabrication des circuits imprimés. La distance entre l'arête18 du dièdre et les brins 20 du dipôle 19 est égale à 0,6λ, λ étant la longueur d'onde à la fréquence centrale 1250 MHz et l'angle du dièdre est égal à 90°. Les deux autres dipôles 30 et 31 sont alimentés en phase ou en opposition de phase par l'intermédiaire d'un répartiteur d'énergie du type "anneau hybride 6 λ/4". Le réflecteur plan 22 est constitué par une plaque de diélectrique métallisé et la distance qui le sépare des brins des dipôles 30 et 31 est égale à 0,25 λ',λ' étant la longueur d'onde à la fréquence centrale 1000MHz.A particular application of the embodiment described in FIG. 3 has been made for a radiating source which has to operate in two distinct frequency bands centered on 1000 MHz and 1250 MHz. The network of parallel metallic wires 21, constituting the semi-transparent reflector 15 in the form of a dihedral, is obtained by the photoengraving process used in the technology for manufacturing printed circuits. The distance between the edge18 of the dihedral and the strands 20 of the dipole 19 is equal to 0.6λ, λ being the wavelength at the central frequency 1250 MHz and the angle of the dihedral is equal to 90 °. The other two dipoles 30 and 31 are supplied in phase or in phase opposition via an energy distributor of the "6 λ / 4 hybrid ring" type. The flat reflector 22 is constituted by a metallized dielectric plate and the distance which separates it from the strands of the dipoles 30 and 31 is equal to 0.25 λ ', λ' being the wavelength at the central frequency 1000 MHz.

Sur la figure 4 est représenté un autre exemple de réalisation de l'invention, dans lequel les deux systèmes de dipôles rayonnants ne sont constitués que par un seul dipôle 26 et 27 de chacune des deux polarisations. Pour respecter la symétrie de la source, nécessaire pour faire coincider les deux centres de phase, ces deux dipôles doivent être centrés. Pour cela, ils sont montés sur un seul pied 28 commun aux deux mais sont.alimentés par deux lignes coaxiales 37 et 38 distinctes, reliées chacune à l'un des brins 39 et 40 des deux dipôles. Là encore, la forme des réflecteurs est quelconque, autrement dit le réflecteur semi transparent 29 peut être en forme de dièdre ou plan tout comme le réflecteur 300, les remarques concernant leur position relative étant les mêmes que précédemment.In FIG. 4 is shown another exemplary embodiment of the invention, in which the two radiating dipole systems consist only of a single dipole 26 and 27 of each of the two polarizations. To respect the symmetry of the source, necessary to make the two phase centers coincide, these two dipoles must be centered. For this, they are mounted on a single foot 28 common to both but are supplied by two coaxial lines 37 and 38 separate, each connected to one of the strands 39 and 40 of the two dipoles. Here again, the shape of the reflectors is arbitrary, in other words the semi-transparent reflector 29 can be in the form of a dihedral or a plane just like the reflector 300, the remarks concerning their relative position being the same as above.

Sur la figure 5 est envisagé le cas où les deux dispositifs réflecteurs 290 et 301 sont réalisés en forme de dièdres. Comme cela a été expliqué auparavant, les deux systèmes de dipôles ayant leurs brins perpendiculaires les uns par rapport aux autres, les dièdres sont disposés de sorte que les arêtes 310 et 32 formées respectivement par l'intersection des plans (33 et 34) et (35 et 36), sont perpendiculaires.In Figure 5 is considered the case where the two reflecting devices 290 and 301 are made in the form of dihedrons. As explained above, the two dipole systems having their strands perpendicular to each other, the dihedrons are arranged so that the edges 310 and 32 formed respectively by the intersection of the planes (33 and 34) and ( 35 and 36), are perpendicular.

Enfin la figure 6 représente un autre exemple de réalisation de l'invention, dans lequel le réflecteur 41 en forme de dièdre est placé de sorte que son arête 42 est située derrière le réflecteur plan 43. Au réflecteur 41 est associé un dipôle 44 dont les brins sont parallèles à l'arête 42 et au réflecteur plan 43 sont associés deux dipôles 45 et 46 de polarisation croisée par rapport à celle du dipôle 44. La partie du réflecteur plan 43 située en avant de l'arête 42 doit obligatoirement être semi-transparente pour laisser passer l'onde émise par un des deux systèmes de dipôles rayonnants, c'est-à-dire par le dipôle 44 dans le cas précis de cette figure. L'autre partie de ce réflecteur, comme le réflecteur dièdre 41 lui-même peuvent être constitués par des plaques métalliques pleines ou par des réseaux polariseurs selon le but recherché.Finally, FIG. 6 represents another exemplary embodiment of the invention, in which the reflector 41 in the form of a dihedral is placed so that its edge 42 is located behind the plane reflector 43. To the reflector 41 is associated a dipole 44 whose strands are parallel to the edge 42 and to the plane reflector 43 are associated two dipoles 45 and 46 of cross polarization with respect to that of the dipole 44. The part of the plane reflector 43 located in front of the edge 42 must necessarily be semi- transparent to let pass the wave emitted by one of the two systems of radiating dipoles, that is to say by the dipole 44 in the precise case of this figure. The other part of this reflector, like the dihedral reflector 41 itself, can be constituted by solid metal plates or by polarizing networks depending on the desired objective.

Dans tous ces cas de réalisation décrits, les systèmes polariseurs constitués par des réseaux de fils métalliques peuvent être photogravés sur des plaquettes de matériau diélectrique. On peut également remplacer ces réseaux de fils par des lames métalliques parallèles plus rigides. Les remarques concernant la position relative des deux ensembles rayonnants source-réflecteur, leur réalisation pratique et l'ajout de mousse de polyuriéthane comme celui d'un radome sont valables également par tous ces cas.In all these described embodiments, the polarizing systems constituted by arrays of metal wires can be photo-etched on plates of dielectric material. These networks of wires can also be replaced by more rigid parallel metal blades. The remarks concerning the relative position of the two radiant source-reflector assemblies, their practical realization and the addition of polyurethane foam like that of a radome are also valid in all these cases.

On a ainsi décrit une source rayonnante bi-bande compacte, qui peut être utilisée comme élément rayonnant directement seul ou bien en tant qu'élément d'une antenne à balayage électronique. Mais cette source peut aussi éclairer un système optique focalisant, dont la position par rapport aux deux ensembles rayonnants source-réflecteur qui la constituent est telle que le foyer de ce système optique est confondu avec leurs deux centres de phase.A compact dual-band radiating source has thus been described, which can be used as a radiating element directly alone or as part of an antenna with electronic scanning. However, this source can also illuminate a focusing optical system, the position of which with respect to the two radiating source-reflector assemblies which constitute it is such that the focus of this optical system coincides with their two phase centers.

Claims (12)

1. Source rayonnante bi-bande compacte fonctionnant dans le domaine des hyperfréquences, comportant deux ensembles rayonnants source-réflecteur, le premier ensemble étant constitué par un système de dipôles (l9) accordés sur la bande de fréquence dont la fréquence centrale est la plus élevée des deux fréquences centrales des deux bandes et rayonnant une onde de polarisation déterminée, associé à un réflecteur semi-transparent (15), le second ensemble étant consitué par un système de dipôles (30-31) rayonnant une onde de polarisation croisée par rapport à la précédente associé à un dispositif totalement réflecteur (22), caractérisée en ce que le dispositif réflecteur semi-transparent (15) est réalisé en forme de dièdre, le système de dipôles (19) qui lui est associé étant tel que la direction de leurs brins (20) est parallèle à l'arête (18) du dièdre (15) et en ce que la position relative de ces deux ensembles l'un par rapport à l'autre est telle que leurs centres de phase sont confondus.1. Compact dual-band radiating source operating in the microwave domain, comprising two radiating source-reflector assemblies, the first assembly consisting of a system of dipoles (l9) tuned to the frequency band whose central frequency is the highest of the two central frequencies of the two bands and radiating a determined polarization wave, associated with a semi-transparent reflector (15), the second set being constituted by a system of dipoles (30-31) radiating a polarization wave crossed with respect to the previous one associated with a fully reflecting device (22), characterized in that the semi-transparent reflecting device (15) is made in the form of a dihedral, the dipole system (19) associated with it being such that the direction of their strands (20) is parallel to the edge (18) of the dihedral (15) and in that the relative position of these two sets with respect to each other is such that their phase centers coincide s. 2. Source rayonnant bi-bande selon la revendication 1, caractérisée en. ce que le dispositif totalement réflecteur (22) est plan.2. A dual-band radiating source according to claim 1, characterized in. that the fully reflective device (22) is planar. 3. Source rayonnante bi-bande selon la revendication 1, caractérisée en ce que le dispositif totalement réflecteur est réalisé en forme de dièdre (30) et en ce que le ou les dipôles qui lui sont associés sont tels que la direction de leurs brins est parallèle à l'arête (32) du dièdre (301).3. A dual-band radiating source according to claim 1, characterized in that the totally reflecting device is made in the form of a dihedral (30) and in that the dipole or dipoles which are associated with it are such that the direction of their strands is parallel to the edge (32) of the dihedral (301). 4. Source rayonnante bi-bande selon les revendications 2 ou 3, caractérisée en ce que le dispositif réflecteur semi-transparent (15) en forme de dièdre laisse passer l'onde rayonnée par le système de dipôles (19) auquel il est associé et réfléchit totalement l'onde rayonnée par le second système de dipôles (30-31).4. Dual-band radiating source according to claims 2 or 3, characterized in that the semi-transparent reflector device (15) in the form of a dihedral lets the radiated wave pass through the dipole system (19) with which it is associated and totally reflects the wave radiated by the second system of dipoles (30-31). 5. Source rayonnante bi-bande selon les revendications 2 ou 3, caractérisée en ce que le dispositif réflecteur semi-transparent (29) en forme de dièdre laisse passer l'onde rayonnée par le second système de dipôle (27) et réfléchit totalement l'onde rayonnée par le système de dipôle (26) auquel il est associé.5. Bi-band radiating source according to claims 2 or 3, characterized in that the semi-transparent reflector device (29) in the form of a dihedral lets pass the wave radiated by the second dipole system (27) and completely reflects the wave radiated by the dipole system (26) with which it is associated. 6. Source rayonnante bi-bande selon les revendications 4 ou 5, caractérisée en ce que le dispositif réflecteur semi-transparent (15) est constitué par un réseau de fils métalliques parallèles (21) dont la direction est perpendiculaire à celle de la polarisation de l'onde pour laquelle il est transparent.6. Dual-band radiating source according to claims 4 or 5, characterized in that the semi-transparent reflector device (15) consists of a network of parallel metallic wires (21) whose direction is perpendicular to that of the polarization of the wave for which it is transparent. 7. Source rayonnante bi-bande selon la revendication 2 ou 3, caractérisée en ce que le dispositif totalement réflecteur est constitué par un réseau de fils métalliques parallèles (13) dont la direction est parallèle à la polarisation de l'onde qu'il réfléchit, ou par un réseau de fils métalliques croisés ou par une surface à métallisation continue.7. Bi-band radiating source according to claim 2 or 3, characterized in that the totally reflecting device is constituted by a network of parallel metallic wires (13) whose direction is parallel to the polarization of the wave it reflects , or by a network of crossed metallic wires or by a surface with continuous metallization. 8. Source rayonnante bi-bande selon l'une des revendications 1 à 7, caractérisée en ce que les deux systèmes de dipôles associés aux deux réflecteurs sont constitués chacun par un seul dipôle (26 et 27) ces deux dipôles étant croisés et montés sur un seul et même pied (28) commun mais alimentés par deux lignes coaxiales (37 et 38) distinctes.8. Dual-band radiating source according to one of claims 1 to 7, characterized in that the two dipole systems associated with the two reflectors each consist of a single dipole (26 and 27) these two dipoles being crossed and mounted on a single common foot (28) but supplied by two separate coaxial lines (37 and 38). 9. Source rayonnante bi-bande selon l'une des revendications 1. à 8, caractérisée en ce que le volume englobant les deux systèmes de dipôles rayonnants et les deux dispositifs réflecteurs est rempli de mousse de polyuréthane à faible densité.9. Dual-band radiating source according to one of claims 1 to 8, characterized in that the volume including the two radiating dipole systems and the two reflecting devices is filled with low density polyurethane foam. 10. Source rayonnante bi-bande selon l'une des revendications 1 à 9, caractérisée en ce qu'un radôme diélectrique est placé autour de la source.10. Dual-band radiating source according to one of claims 1 to 9, characterized in that a dielectric radome is placed around the source. 11. Antenne à balayage électronique comportant un réseau d'éléments rayonnants constitués chacun par une source compacte bi-bande selon l'une des revendications 1 à 8.11. Antenna with electronic scanning comprising an array of radiating elements each consisting of a compact dual-band source according to one of claims 1 to 8. 12. Source primaire éclairant un système optique focalisant, constituée par une rayonnante bi-bande selon l'une des revendications 1 à 8, caractérisée en ce que la position de la source par rapport au système optique est telle que les deux centres de phase des deux ensembles rayonnants source-réflecteur qui la constituent sont confondus avec le foyer du système optique.12. Primary source illuminating a focusing optical system, constituted by a radiating dual-band according to one of claims 1 to 8, characterized in that the position of the source relative to the optical system is such that the two phase centers of the two radiating source-reflector assemblies which constitute it are merged with the focal point of the optical system.
EP81401185A 1980-07-29 1981-07-24 Compact dual-frequency microwave feed Expired EP0045254B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8016712 1980-07-29
FR8016712A FR2488058A1 (en) 1980-07-29 1980-07-29 RADIANT SOURCE COMPACT BI-BAND OPERATING IN THE FIELD OF HYPERFREQUENCIES

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EP0045254A1 true EP0045254A1 (en) 1982-02-03
EP0045254B1 EP0045254B1 (en) 1985-10-02

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DE (1) DE3172526D1 (en)
FR (1) FR2488058A1 (en)

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US4568491A (en) * 1981-04-29 1986-02-04 Hoffmann-La Roche Inc. Process for the preparation of cholesterol derivatives and novel intermediates therefor
EP0466579A1 (en) * 1990-07-11 1992-01-15 AEROSPATIALE Société Nationale Industrielle Double reflector with grids
GB2264006A (en) * 1992-02-01 1993-08-11 British Aerospace Space And Co A reflector antenna assembly for dual linear polarisation.
US5485167A (en) * 1989-12-08 1996-01-16 Hughes Aircraft Company Multi-frequency band phased-array antenna using multiple layered dipole arrays
US5710569A (en) * 1995-03-03 1998-01-20 Ace Antenna Corporation Antenna system having a choke reflector for minimizing sideward radiation
EP1014491A1 (en) * 1998-12-23 2000-06-28 Thomson-Csf Wideband reflector antenna
EP1174946A1 (en) * 2000-04-25 2002-01-23 Lucent Technologies Inc. Phased array antenna with active edge elements
WO2002097923A1 (en) * 2001-04-28 2002-12-05 Anyans Corner antenna
US6795021B2 (en) 2002-03-01 2004-09-21 Massachusetts Institute Of Technology Tunable multi-band antenna array
WO2011159441A1 (en) * 2010-06-14 2011-12-22 Raytheon Company Broad propagation pattern antenna
CN111788490A (en) * 2017-12-20 2020-10-16 塞勒斯公司 Interference measurement type lightning detection system

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GB758957A (en) * 1954-03-23 1956-10-10 British Thomson Houston Co Ltd Improvements relating to ultra-high frequency aerials
US2790169A (en) * 1949-04-18 1957-04-23 Itt Antenna
US2982961A (en) * 1957-03-20 1961-05-02 Calvin C Jones Dual feed antenna
US4063249A (en) * 1974-11-16 1977-12-13 Licentia Patent-Verwaltungs-G.M.B.H. Small broadband antenna having polarization sensitive reflector system

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* Cited by examiner, † Cited by third party
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US2790169A (en) * 1949-04-18 1957-04-23 Itt Antenna
GB758957A (en) * 1954-03-23 1956-10-10 British Thomson Houston Co Ltd Improvements relating to ultra-high frequency aerials
US2982961A (en) * 1957-03-20 1961-05-02 Calvin C Jones Dual feed antenna
US4063249A (en) * 1974-11-16 1977-12-13 Licentia Patent-Verwaltungs-G.M.B.H. Small broadband antenna having polarization sensitive reflector system

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568491A (en) * 1981-04-29 1986-02-04 Hoffmann-La Roche Inc. Process for the preparation of cholesterol derivatives and novel intermediates therefor
US5485167A (en) * 1989-12-08 1996-01-16 Hughes Aircraft Company Multi-frequency band phased-array antenna using multiple layered dipole arrays
EP0466579A1 (en) * 1990-07-11 1992-01-15 AEROSPATIALE Société Nationale Industrielle Double reflector with grids
FR2664750A1 (en) * 1990-07-11 1992-01-17 Aerospatiale GRILLE BIREFLECTOR.
GB2264006A (en) * 1992-02-01 1993-08-11 British Aerospace Space And Co A reflector antenna assembly for dual linear polarisation.
GB2264006B (en) * 1992-02-01 1995-09-27 British Aerospace Space And Co A reflector antenna assembly for dual linear polarisation
US5581265A (en) * 1992-02-01 1996-12-03 Matra Marconi Space Uk Limited Reflector antenna assembly for dual linear polarization
US5710569A (en) * 1995-03-03 1998-01-20 Ace Antenna Corporation Antenna system having a choke reflector for minimizing sideward radiation
EP1014491A1 (en) * 1998-12-23 2000-06-28 Thomson-Csf Wideband reflector antenna
FR2787928A1 (en) * 1998-12-23 2000-06-30 Thomson Csf BROADBAND REFLECTOR ANTENNA
EP1174946A1 (en) * 2000-04-25 2002-01-23 Lucent Technologies Inc. Phased array antenna with active edge elements
US6448937B1 (en) 2000-04-25 2002-09-10 Lucent Technologies Inc. Phased array antenna with active parasitic elements
WO2002097923A1 (en) * 2001-04-28 2002-12-05 Anyans Corner antenna
US6795021B2 (en) 2002-03-01 2004-09-21 Massachusetts Institute Of Technology Tunable multi-band antenna array
WO2011159441A1 (en) * 2010-06-14 2011-12-22 Raytheon Company Broad propagation pattern antenna
US8345639B2 (en) 2010-06-14 2013-01-01 Raytheon Company Broad propagation pattern antenna
CN111788490A (en) * 2017-12-20 2020-10-16 塞勒斯公司 Interference measurement type lightning detection system

Also Published As

Publication number Publication date
FR2488058B1 (en) 1984-07-13
DE3172526D1 (en) 1985-11-07
FR2488058A1 (en) 1982-02-05
EP0045254B1 (en) 1985-10-02

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