EP2469650A1 - Radiofrequency transmission device - Google Patents

Radiofrequency transmission device Download PDF

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Publication number
EP2469650A1
EP2469650A1 EP11306777A EP11306777A EP2469650A1 EP 2469650 A1 EP2469650 A1 EP 2469650A1 EP 11306777 A EP11306777 A EP 11306777A EP 11306777 A EP11306777 A EP 11306777A EP 2469650 A1 EP2469650 A1 EP 2469650A1
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EP
European Patent Office
Prior art keywords
antenna
axis
source
waveguide
electromagnetic radiation
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EP11306777A
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German (de)
French (fr)
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EP2469650B1 (en
Inventor
Jean-Pierre Brasile
Friedman Tchoffo Talom
Patrick Sirot
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Thales SA
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Thales SA
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    • 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
    • H01Q3/02—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 movement of antenna or antenna system as a whole
    • H01Q3/08—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 movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation
    • H01Q3/10—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 movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation to produce a conical or spiral scan

Definitions

  • Radiofrequency transmission devices of very high power comprising an antenna fed by a source of electromagnetic radiation, consisting for example of a magnetron of high power.
  • the antenna is generally rigidly connected to the source of electromagnetic radiation, itself rigidly connected to its high voltage power supply. It is therefore not possible to change the direction of transmission of the antenna without rotating the entire device.
  • the object of the invention is to propose a radiofrequency transmission device that can be used in an arrangement where the direction of the field radiated by the antenna is angularly mobile, reducing the risk of breakdown.
  • the subject of the invention is a radiofrequency transmission device of the aforementioned type, characterized in that the antenna is rotatable relative to the radiation source around an axis, which axis is angularly offset from the transmission axis, and in that the guide duct comprises a first waveguide extending along the axis of rotation of the antenna and rigidly connected to the antenna.
  • the transmission device 10 illustrated in the figure constitutes a microwave weapon capable of emitting, in a determined direction TT, an electromagnetic field intended to disturb or destroy any device comprising electronics.
  • This device 10 comprises a source of electromagnetic radiation 12 in the radiofrequency domain consisting of a high power tube and an emitter antenna 14 connected to the source 12 by a waveguide 16.
  • the source of radiation is high power, several hundred megawatts, for example a magnetron, a MILO for "Magnetically Insulated Line Oscillator" in English, a carcinotron or a relativistic klystron.
  • the transmitting antenna 14 comprises a plane emission surface 21, on which is distributed a set of antenna elements suitable for creating a coherent field along the direction TT by adding the elementary fields, in phase in the direction considered, different antenna elements.
  • the transmitting antenna 14 is of revolution and has an axis of revolution XX constituting a normal to the emission surface 21.
  • the antenna is a radial-type transmission network type antenna, slotted or 'reflect array' type.
  • the transmitting antenna 14 is adapted to emit in the TT direction angularly offset by a fixed angle ⁇ relative to the axis of revolution XX of the antenna 14.
  • the angle ⁇ between the axis of revolution XX and the transmission axis TT of the antenna 14 is substantially equal to 45 °.
  • Each antenna element is formed of a fixed radiating source with respect to the emission surface 21.
  • these sources are propellers or slots.
  • the position and geometry of the radiating sources are calculated in a known manner to obtain the desired illumination law and the desired misalignment angle.
  • the misalignment of the antenna is realized according to the document US 6,259,415 .
  • the guide duct 16 comprises a first 22 and a second 24 waveguides connected by a fixed angular aperture elbow 26.
  • the first and second waveguides 22, 24 are each rectilinear and are adapted to propagate the electromagnetic radiation from the source 12 to the antenna 14.
  • the first waveguide 22 is along the axis of revolution XX of the antenna to which it is rigidly connected.
  • the first waveguide is able to rotate generally around the axis of revolution XX by being driven by a first motor not shown.
  • the mode of propagation in the guide is transverse magnetic TM 01 type.
  • TM 01 type is the natural mode produced by power tubes such as MILO or carcinotron.
  • the antenna 14 comprises, facing the second waveguide 22, a metal cone adapted to modify the propagation mode of the electromagnetic flux, in order to obtain a transverse magnetic mode of type TM 01 .
  • the TM 01 mode has the advantage of an electric field and a zero axial magnetic field on the walls, which allows the establishment of rotating joint without risk of breakdown even at high power.
  • the second waveguide 24 is connected to the source of electromagnetic radiation.
  • the second waveguide 24 extends along another axis Z-Z and is adapted to rotate generally around this axis Z-Z being driven by a second motor not shown.
  • the axis of the X-X antenna and the other Z-Z axis are concurrent. In the example considered, the Z-Z axis is vertical.
  • the transmitting device comprises two rotating rotary joints placed on the first and second waveguides.
  • a first rotary joint 22A is disposed along the X-X axis, between two consecutive coaxial sections 22B, 22C of the first waveguide.
  • the second rotary joint 24A is disposed along the Z-Z axis, between two consecutive sections 24B, 24C of the second waveguide.
  • Each rotary joint is formed by two consecutive coaxial sections connected by a ball bearing.
  • the antenna 14 is able to rotate globally both around its axis of revolution X-X and around the other axis Z-Z.
  • the radiofrequency transmission device according to the invention is furthermore devoid of other articulations forming degrees of angular freedom between the source 12 and the antenna 14 thus reducing the risk of breakdown.
  • the electromagnetic flux is generated by the source of electromagnetic radiation. It propagates to the antenna 14 through the guide duct 16 firstly along the axis ZZ in the second waveguide 24 and then along the axis of revolution of the antenna XX in the first waveguide. wave 22. The electromagnetic wave is then emitted in the transmission direction TT of the antenna angularly offset by an angle ⁇ of the axis of revolution XX of the antenna.
  • the mode converter modifies the mode of propagation of the electromagnetic flux emitted by the antenna feed in order to obtain the TM 01 mode.
  • the first waveguide 22 rotates generally around the axis of revolution XX by the actuation of the first motor.
  • the emission direction T-T of the electromagnetic wave describes a cone whose generator forms an angle ⁇ with the axis of revolution X-X of the antenna by the rotation of the first waveguide.
  • the second waveguide 24 rotates substantially around the other axis Z-Z by the actuation of the second motor thereby causing the assembly formed by the first waveguide and the antenna to rotate.
  • the volume of the travel of the antenna which is generally large in order to have a large gain, is thus greatly limited which is a great advantage for airborne systems equipped with such a transmission device.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Waveguide Connection Structure (AREA)

Abstract

The device (10) has a guide duct (16) for guiding electromagnetic radiation from an electromagnetic radiation source (12) e.g. magnetron, to a transmitting antenna (14), where the antenna has a transmission axis (T-T). The antenna rotates relative to the source around a rotation axis (X-X) angularly offset from the transmission axis. The guide duct has a wave guide (22) extending along a rotation axis (X-X) of the antenna and rigidly connected to the antenna. The duct has another wave guide (24) extending along a vertical axis (Z-Z) and connected to the source and the former wave guide.

Description

La présente invention concerne un dispositif d'émission radiofréquence, du type d'émission comportant :

  • une source de rayonnement électromagnétique ;
  • une antenne de type réseau ayant un axe d'émission ; et
  • un conduit de guidage du rayonnement électromagnétique de la source à l'antenne.
The present invention relates to a radiofrequency transmission device, of the type of emission comprising:
  • a source of electromagnetic radiation;
  • a network type antenna having a transmission axis; and
  • a conduit for guiding the electromagnetic radiation from the source to the antenna.

On connait des dispositifs d'émission radiofréquence de très forte puissance comportant une antenne alimentée par une source de rayonnement électromagnétique, constituée par exemple d'un magnétron de forte puissance.Radiofrequency transmission devices of very high power are known comprising an antenna fed by a source of electromagnetic radiation, consisting for example of a magnetron of high power.

L'antenne est en général rigidement connectée à la source de rayonnement électromagnétique, elle-même rigidement connectée à son alimentation haute tension. Il n'est donc pas possible de modifier la direction d'émission de l'antenne sans faire tourner l'ensemble du dispositif.The antenna is generally rigidly connected to the source of electromagnetic radiation, itself rigidly connected to its high voltage power supply. It is therefore not possible to change the direction of transmission of the antenna without rotating the entire device.

Afin de changer la direction d'émission d'une antenne d'un dispositif d'émission, il est connu également par ailleurs de rendre déplaçable l'antenne par rapport à la source de rayonnement au moyen d'un support mobile et motorisé rendant ainsi nécessaire l'existence d'un conduit de guidage ou guide d'onde déformable angulairement pour l'acheminement du flux électromagnétique de la source à l'antenne. La déformation du guide d'onde nécessite l'usage de mécanismes complexes d'autant que le flux doit être guidé sous vide. Les articulations assurant la déformation du guide d'onde sont souvent à l'origine de phénomènes de claquage et ne sont donc pas adaptés aux très fortes puissances ni aux très grands débattements.In order to change the direction of emission of an antenna of a transmitting device, it is also known moreover also to make the antenna movable with respect to the radiation source by means of a mobile and motorized support thus rendering necessary the existence of a guide duct or angularly deformable waveguide for the routing of the electromagnetic flux from the source to the antenna. Deformation of the waveguide requires the use of complex mechanisms especially as the flow must be guided under vacuum. The joints ensuring the deformation of the waveguide are often at the origin of breakdown phenomena and are therefore not suitable for very high power or very large deflections.

Le document US 4 862 185 décrit un système de pointage pour lequel le faisceau principal rayonné est susceptible de décrire un cône de révolution autour d'un axe de rotation. Cependant, le système proposé comprenant une antenne émettrice intégrant un réflecteur, reste peu compacte et mal adapté aux fortes puissances.The document US 4,862,185 describes a pointing system for which the radiated main beam is capable of describing a cone of revolution about an axis of rotation. However, the proposed system comprising a transmitting antenna incorporating a reflector, remains uncomplicated and poorly adapted to high power.

Ce problème a été partiellement résolu dans le document US 6 259 415 dans le cas d'une antenne réseau à l'aide d'un dépointage fixe du faisceau rayonné par rapport à l'axe de l'antenne et un joint tournant vertical permettant au faisceau de décrire un cône de révolution autour de l'axe vertical. Toutefois, le système proposé comporte un dispositif mécanique permettant un débattement mécanique de l'antenne de ± 25° nécessitant une liaison coaxiale souple pour alimenter l'antenne réseau. Un tel système n'est pas adapté aux fortes puissances en raison des limitations en claquage d'une telle liaison.This problem has been partially resolved in the document US 6,259,415 in the case of a network antenna using a fixed misalignment of the beam radiated from the axis of the antenna and a vertical rotating joint allowing the beam to describe a cone of revolution about the vertical axis . However, the proposed system includes a mechanical device allowing a mechanical movement of the antenna of ± 25 ° requiring a flexible coaxial connection to power the network antenna. Such a system is not suitable for high power because of the limitations in breakdown of such a link.

L'invention a pour but de proposer un dispositif d'émission radiofréquence permettant d'être utilisé dans un agencement où la direction du champ rayonné par l'antenne est mobile angulairement, en réduisant les risques de claquage.The object of the invention is to propose a radiofrequency transmission device that can be used in an arrangement where the direction of the field radiated by the antenna is angularly mobile, reducing the risk of breakdown.

A cet effet, l'invention a pour objet un dispositif d'émission radiofréquence du type précité, caractérisé en ce que l'antenne est rotative par rapport à la source de rayonnement autour d'un axe, lequel axe est décalé angulairement de l'axe d'émission, et en ce que le conduit de guidage comporte un premier guide d'onde s'étendant suivant l'axe de rotation de l'antenne et lié rigidement à l'antenne.For this purpose, the subject of the invention is a radiofrequency transmission device of the aforementioned type, characterized in that the antenna is rotatable relative to the radiation source around an axis, which axis is angularly offset from the transmission axis, and in that the guide duct comprises a first waveguide extending along the axis of rotation of the antenna and rigidly connected to the antenna.

Suivant des modes particuliers de réalisation, le dispositif d'émission radiofréquence comporte l'une ou plusieurs des caractéristiques suivantes prises seules ou en combinaison :

  • l'antenne est rotative autour d'un axe auxiliaire décalé angulairement de l'axe de rotation de l'antenne ;
  • le conduit de guidage comporte un second guide d'onde s'étendant suivant l'axe auxiliaire connecté à la source de rayonnement électromagnétique et au premier guide d'onde ;
  • le conduit de guidage comporte un coude d'ouverture angulaire fixe reliant le premier guide d'onde et le second guide d'onde ;
  • l'axe de rotation de l'antenne forme un axe de révolution de l'antenne ;
  • l'axe de rotation de l'antenne et l'axe auxiliaire sont concourants ;
  • le dispositif comporte un joint tournant reliant suivant l'axe de rotation de l'antenne deux tronçons consécutifs coaxiaux du premier guide d'onde ;
  • le conduit de guidage est adapté afin que le rayonnement électromagnétique se propage de la source à l'antenne selon un mode transverse magnétique TM01 ; et
  • le dispositif comporte un convertisseur de mode en sortie de la source ou en entrée de l'antenne de sorte que le rayonnement électromagnétique se propage selon le mode transverse magnétique TM01 de la source à l'antenne.
According to particular embodiments, the radiofrequency transmission device comprises one or more of the following characteristics taken alone or in combination:
  • the antenna is rotatable about an auxiliary axis angularly offset from the axis of rotation of the antenna;
  • the guide duct comprises a second waveguide extending along the auxiliary axis connected to the source of electromagnetic radiation and the first waveguide;
  • the guide duct has a fixed angular opening bend connecting the first waveguide and the second waveguide;
  • the axis of rotation of the antenna forms an axis of revolution of the antenna;
  • the axis of rotation of the antenna and the auxiliary axis are concurrent;
  • the device comprises a rotary joint connecting, along the axis of rotation of the antenna, two consecutive coaxial sections of the first waveguide;
  • the guide duct is adapted so that the electromagnetic radiation propagates from the source to the antenna in a transverse magnetic mode TM 01 ; and
  • the device comprises a mode converter at the output of the source or at the input of the antenna so that the electromagnetic radiation propagates according to the transverse magnetic mode TM 01 from the source to the antenna.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant à la figure unique annexée, qui est une vue en perspective d'un dispositif d'émission d'ondes radiofréquence selon l'invention.The invention will be better understood on reading the description which will follow, given solely by way of example and with reference to the single appended figure, which is a perspective view of a device for transmitting waves. radio frequency according to the invention.

Le dispositif d'émission 10 illustré sur la figure constitue une arme microonde propre à émettre, dans une direction déterminée T-T, un champ électromagnétique destiné à perturber ou détruire tout dispositif comportant de l'électronique.The transmission device 10 illustrated in the figure constitutes a microwave weapon capable of emitting, in a determined direction TT, an electromagnetic field intended to disturb or destroy any device comprising electronics.

Ce dispositif 10 comporte une source de rayonnement électromagnétique 12 dans le domaine radiofréquence constituée d'un tube de forte puissance et d'une antenne émettrice 14 reliée à la source 12 par un guide d'onde 16.This device 10 comprises a source of electromagnetic radiation 12 in the radiofrequency domain consisting of a high power tube and an emitter antenna 14 connected to the source 12 by a waveguide 16.

La source de rayonnement est de forte puissance, de plusieurs centaines de mégawatts, par exemple un magnétron, un MILO pour « Magnetically Insulated Line Oscillator » en anglais, un carcinotron ou un klystron relativiste.The source of radiation is high power, several hundred megawatts, for example a magnetron, a MILO for "Magnetically Insulated Line Oscillator" in English, a carcinotron or a relativistic klystron.

L'antenne émettrice 14 est comporte une surface d'émission plane 21, sur laquelle est réparti un ensemble d'éléments d'antenne propres à créer un champ cohérent suivant la direction T-T par addition des champs élémentaires, en phase dans la direction considérée, des différents éléments d'antenne.The transmitting antenna 14 comprises a plane emission surface 21, on which is distributed a set of antenna elements suitable for creating a coherent field along the direction TT by adding the elementary fields, in phase in the direction considered, different antenna elements.

Dans l'exemple considéré, l'antenne émettrice 14 est de révolution et présente un axe de révolution X-X constituant une normale à la surface d'émission 21. Par exemple, l'antenne est une antenne de type réseau à lignes de transmission radiale, à fentes ou de type 'reflect array'.In the example considered, the transmitting antenna 14 is of revolution and has an axis of revolution XX constituting a normal to the emission surface 21. For example, the antenna is a radial-type transmission network type antenna, slotted or 'reflect array' type.

En outre, l'antenne émettrice 14 est propre à émettre suivant la direction T-T décalée angulairement d'un angle θ fixe par rapport à l'axe de révolution X-X de l'antenne 14. De préférence, l'angle θ entre l'axe de révolution X-X et l'axe d'émission T-T de l'antenne 14 est sensiblement égal à 45°.In addition, the transmitting antenna 14 is adapted to emit in the TT direction angularly offset by a fixed angle θ relative to the axis of revolution XX of the antenna 14. Preferably, the angle θ between the axis of revolution XX and the transmission axis TT of the antenna 14 is substantially equal to 45 °.

Chaque élément d'antenne est formé d'une source rayonnante fixe par rapport à la surface d'émission 21. Suivant le type d'antenne réseau retenu, ces sources sont des hélices ou des fentes. La position et la géométrie des sources rayonnantes sont calculées de façon connue pour obtenir la loi d'illumination et l'angle de dépointage souhaités.Each antenna element is formed of a fixed radiating source with respect to the emission surface 21. Depending on the type of network antenna used, these sources are propellers or slots. The position and geometry of the radiating sources are calculated in a known manner to obtain the desired illumination law and the desired misalignment angle.

A titre d'exemple, le dépointage de l'antenne est réalisé selon le document US 6 259 415 .For example, the misalignment of the antenna is realized according to the document US 6,259,415 .

On conçoit qu'avec un tel agencement, une onde cohérente est produite par l'addition des ondes électromagnétiques élémentaires produites par chaque élément d'antenne. L'onde cohérente se propage suivant la direction T-T formant un angle θ prédéfini par rapport à la normale de la surface d'émission 21. Selon l'invention, le conduit de guidage 16 comporte un premier 22 et un second 24 guides d'onde reliés par un coude d'ouverture angulaire fixe 26. Les premier et second guides d'onde 22, 24 sont chacun rectilignes et sont adaptés pour propager le rayonnement électromagnétique de la source 12 à l'antenne 14.It is conceivable that with such an arrangement, a coherent wave is produced by the addition of the elementary electromagnetic waves produced by each antenna element. The coherent wave propagates along the direction TT forming an angle θ predefined with respect to the normal of the emission surface 21. According to the invention, the guide duct 16 comprises a first 22 and a second 24 waveguides connected by a fixed angular aperture elbow 26. The first and second waveguides 22, 24 are each rectilinear and are adapted to propagate the electromagnetic radiation from the source 12 to the antenna 14.

Le premier guide d'onde 22 est suivant l'axe de révolution X-X de l'antenne à laquelle il est relié rigidement. De plus, le premier guide d'onde est propre à tourner globalement autour de l'axe de révolution X-X en étant entraîné par un premier moteur non représenté.The first waveguide 22 is along the axis of revolution XX of the antenna to which it is rigidly connected. In addition, the first waveguide is able to rotate generally around the axis of revolution XX by being driven by a first motor not shown.

Le mode de propagation dans le guide est transverse magnétique de type TM01. Un tel mode est le mode naturel produit par des tubes de puissance tels que le MILO ou le carcinotron. Pour le cas où le mode de sortie du tube envisagé est d'une autre nature, l'antenne 14 comporte en regard du second guide d'onde 22 un cône métallique propre à modifier le mode de propagation du flux électromagnétique, afin d'obtenir un mode transverse magnétique de type TM01. Le mode TM01 présente en effet l'avantage d'un champ électrique et d'un champ magnétique axial nul sur les parois, ce qui permet la mise en place de joint tournant sans risque de claquage même à forte puissance.The mode of propagation in the guide is transverse magnetic TM 01 type. Such a mode is the natural mode produced by power tubes such as MILO or carcinotron. In the case where the output mode of the tube envisaged is of a different nature, the antenna 14 comprises, facing the second waveguide 22, a metal cone adapted to modify the propagation mode of the electromagnetic flux, in order to obtain a transverse magnetic mode of type TM 01 . The TM 01 mode has the advantage of an electric field and a zero axial magnetic field on the walls, which allows the establishment of rotating joint without risk of breakdown even at high power.

En outre, le second guide d'onde 24 est connecté à la source de rayonnement électromagnétique. Le second guide d'onde 24 s'étend suivant un autre axe Z-Z et est propre à tourner globalement autour de cet axe Z-Z en étant entraîné par un second moteur non représenté. L'axe de l'antenne X-X et l'autre axe Z-Z sont concourants. Dans l'exemple considéré, l'axe Z-Z est vertical.In addition, the second waveguide 24 is connected to the source of electromagnetic radiation. The second waveguide 24 extends along another axis Z-Z and is adapted to rotate generally around this axis Z-Z being driven by a second motor not shown. The axis of the X-X antenna and the other Z-Z axis are concurrent. In the example considered, the Z-Z axis is vertical.

Le dispositif d'émission comporte deux joints tournants rotatifs placés sur les premier et second guides d'onde. Un premier joint tournant 22A est disposé suivant l'axe X-X, entre deux tronçons consécutifs coaxiaux 22B, 22C du premier guide d'onde.The transmitting device comprises two rotating rotary joints placed on the first and second waveguides. A first rotary joint 22A is disposed along the X-X axis, between two consecutive coaxial sections 22B, 22C of the first waveguide.

De même, le second joint tournant 24A est disposé suivant l'axe Z-Z, entre deux tronçons consécutifs 24B, 24C du second guide d'onde.Similarly, the second rotary joint 24A is disposed along the Z-Z axis, between two consecutive sections 24B, 24C of the second waveguide.

Chaque joint tournant est formé par deux tronçons coaxiaux consécutifs connectés par un roulement à billes.Each rotary joint is formed by two consecutive coaxial sections connected by a ball bearing.

On comprend ainsi que l'antenne 14 est propre à tourner globalement à la fois autour de son axe de révolution X-X et autour de l'autre axe Z-Z.It is thus understood that the antenna 14 is able to rotate globally both around its axis of revolution X-X and around the other axis Z-Z.

Le dispositif d'émission radiofréquence selon l'invention est en outre dépourvu d'autres articulations formant des degrés de libertés angulaires entre la source 12 et l'antenne 14 réduisant ainsi les risques de claquage.The radiofrequency transmission device according to the invention is furthermore devoid of other articulations forming degrees of angular freedom between the source 12 and the antenna 14 thus reducing the risk of breakdown.

En fonctionnement, dans un tel dispositif d'émission, le flux électromagnétique est généré par la source de rayonnement électromagnétique. Il se propage jusqu'à l'antenne 14 grâce au conduit de guidage 16 tout d'abord selon l'axe Z-Z dans le second guide d'onde 24 puis selon l'axe de révolution de l'antenne X-X dans le premier guide d'onde 22. L'onde électromagnétique est ensuite émise selon la direction d'émission T-T de l'antenne décalée angulairement d'un angle θ de l'axe de révolution X-X de l'antenne. Dans le cas où l'antenne 14 est alimentée sur un autre mode que le mode TM01, le convertisseur de mode modifie le mode de propagation du flux électromagnétique émis par l'alimentation de l'antenne afin d'obtenir le mode TM01.In operation, in such a transmission device, the electromagnetic flux is generated by the source of electromagnetic radiation. It propagates to the antenna 14 through the guide duct 16 firstly along the axis ZZ in the second waveguide 24 and then along the axis of revolution of the antenna XX in the first waveguide. wave 22. The electromagnetic wave is then emitted in the transmission direction TT of the antenna angularly offset by an angle θ of the axis of revolution XX of the antenna. In the case where the antenna 14 is fed in a mode other than the TM 01 mode, the mode converter modifies the mode of propagation of the electromagnetic flux emitted by the antenna feed in order to obtain the TM 01 mode.

Le premier guide d'onde 22 tourne globalement autour de l'axe de révolution X-X par l'actionnement du premier moteur.The first waveguide 22 rotates generally around the axis of revolution XX by the actuation of the first motor.

On comprend que la direction d'émission T-T de l'onde électromagnétique décrit un cône dont la génératrice forme un angle θ avec l'axe de révolution X-X de l'antenne par la rotation du premier guide d'onde.It will be understood that the emission direction T-T of the electromagnetic wave describes a cone whose generator forms an angle θ with the axis of revolution X-X of the antenna by the rotation of the first waveguide.

De plus, le second guide d'onde 24 tourne globalement autour de l'autre axe Z-Z par l'actionnement du second moteur entrainant ainsi en rotation l'ensemble formé par le premier guide d'onde et l'antenne.In addition, the second waveguide 24 rotates substantially around the other axis Z-Z by the actuation of the second motor thereby causing the assembly formed by the first waveguide and the antenna to rotate.

On comprend qu'un tel agencement permet d'émettre une onde électromagnétique sur 360° de façon simple et performante.It is understood that such an arrangement makes it possible to emit a 360 ° electromagnetic wave simply and efficiently.

En outre, le volume du débattement de l'antenne, qui généralement est de grande dimension afin d'avoir un grand gain, est ainsi fortement limité ce qui est un grand avantage pour les systèmes aéroportés équipés d'un tel dispositif d'émission.In addition, the volume of the travel of the antenna, which is generally large in order to have a large gain, is thus greatly limited which is a great advantage for airborne systems equipped with such a transmission device.

Claims (9)

Dispositif d'émission (10) comportant : - une source (12) de rayonnement électromagnétique ; - une antenne de type réseau (14) ayant un axe d'émission (T-T) ; et - un conduit de guidage (16) du rayonnement électromagnétique de la source (12) à l'antenne (14),
le dispositif étant caractérisé en ce que l'antenne (14) est rotative par rapport à la source de rayonnement (12) autour d'un axe (X-X), lequel axe (X-X) est décalé angulairement de l'axe d'émission (T-T) et en ce que le conduit de guidage (16) comporte un premier guide d'onde (22) s'étendant suivant l'axe (X-X) de rotation de l'antenne (14) et lié rigidement à l'antenne (14). Emitting device (10) comprising: a source (12) of electromagnetic radiation; - A network type antenna (14) having a transmission axis (TT); and a guide duct (16) for electromagnetic radiation from the source (12) to the antenna (14),
the device being characterized in that the antenna (14) is rotatable relative to the radiation source (12) about an axis (XX), which axis (XX) is angularly offset from the transmission axis ( TT) and in that the guide duct (16) comprises a first waveguide (22) extending along the axis (XX) of rotation of the antenna (14) and rigidly connected to the antenna ( 14). Dispositif d'émission selon la revendication 1, caractérisé en ce que l'antenne est rotative autour d'un axe auxiliaire (Z-Z) décalé angulairement de l'axe (X-X) de rotation de l'antenne.Transmission device according to claim 1, characterized in that the antenna is rotatable about an auxiliary axis (ZZ) angularly offset from the axis (XX) of rotation of the antenna. Dispositif d'émission selon la revendication 2, caractérisé en ce que le conduit de guidage comporte un second guide d'onde (24) s'étendant suivant l'axe auxiliaire (Z-Z) connecté à la source de rayonnement électromagnétique (12) et au premier guide d'onde (22).Transmitting device according to claim 2, characterized in that the guide duct comprises a second waveguide (24) extending along the auxiliary axis (ZZ) connected to the source of electromagnetic radiation (12) and to the first waveguide (22). Dispositif d'émission selon la revendication 3, caractérisé en ce que le conduit de guidage (16) comporte un coude (26) d'ouverture angulaire fixe reliant le premier guide d'onde (22) et le second guide d'onde (24).Transmitting device according to Claim 3, characterized in that the guide duct (16) has a fixed angular opening (26) connecting the first waveguide (22) and the second waveguide (24). ). Dispositif d'émission selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'axe (X-X) de rotation de l'antenne forme un axe de révolution de l'antenne.Transmission device according to any one of claims 1 to 4, characterized in that the axis (XX) of rotation of the antenna forms an axis of revolution of the antenna. Dispositif d'émission selon la revendication 2, caractérisé en ce que l'axe (X-X) de rotation de l'antenne et l'axe auxiliaire (Z-Z) sont concourants.Transmission device according to claim 2, characterized in that the axis (XX) of rotation of the antenna and the auxiliary axis (ZZ) are concurrent. Dispositif d'émission selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'il comporte un joint tournant reliant suivant l'axe de rotation de l'antenne deux tronçons consécutifs coaxiaux du premier guide d'onde (22).Transmission device according to any one of claims 1 to 6, characterized in that it comprises a rotary joint connecting, along the axis of rotation of the antenna, two consecutive coaxial sections of the first waveguide (22). Dispositif d'émission selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le conduit de guidage (16) est adapté afin que le rayonnement électromagnétique se propage de la source (12) à l'antenne (14) selon un mode transverse magnétique TM01.Transmitting device according to one of Claims 1 to 7, characterized in that the guide duct (16) is adapted so that the electromagnetic radiation propagates from the source (12) to the antenna (14) in accordance with a transverse magnetic mode TM 01 . Dispositif d'émission selon la revendication 8, caractérisé en ce qu'il comporte un convertisseur de mode en sortie de la source (12) ou en entrée de l'antenne (14) de sorte que le rayonnement électromagnétique se propage selon le mode transverse magnétique TM01 de la source (12) à l'antenne (14)Transmitting device according to Claim 8, characterized in that it comprises a mode converter at the output of the source (12) or at the input of the antenna (14) so that the electromagnetic radiation propagates in the transverse mode magnetic TM 01 from the source (12) to the antenna (14)
EP11306777.1A 2010-12-27 2011-12-26 Radiofrequency transmission device Active EP2469650B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1005126A FR2969831B1 (en) 2010-12-27 2010-12-27 RADIO FREQUENCY TRANSMISSION DEVICE

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EP2469650B1 EP2469650B1 (en) 2016-05-18

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US10109183B1 (en) * 2016-12-30 2018-10-23 Panosense Inc. Interface for transferring data between a non-rotating body and a rotating body
US10742088B2 (en) 2016-12-30 2020-08-11 Panosense Inc. Support assembly for rotating body

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FR2969831A1 (en) 2012-06-29
FR2969831B1 (en) 2013-05-10
EP2469650B1 (en) 2016-05-18

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