EP0364335A1 - Travelling-wave tube with a gas-tight coupling arrangement between its slow-wave circuit and an external microwave circuit - Google Patents

Travelling-wave tube with a gas-tight coupling arrangement between its slow-wave circuit and an external microwave circuit Download PDF

Info

Publication number
EP0364335A1
EP0364335A1 EP89402725A EP89402725A EP0364335A1 EP 0364335 A1 EP0364335 A1 EP 0364335A1 EP 89402725 A EP89402725 A EP 89402725A EP 89402725 A EP89402725 A EP 89402725A EP 0364335 A1 EP0364335 A1 EP 0364335A1
Authority
EP
European Patent Office
Prior art keywords
coupling
wave tube
delay line
traveling wave
microwave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89402725A
Other languages
German (de)
French (fr)
Inventor
Jacques Tikes
Joel Le Fur
Pierre Nugues
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0364335A1 publication Critical patent/EP0364335A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/48—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type
    • H01J23/50—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type the interaction circuit being a helix or derived from a helix
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/42—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit the interaction circuit being a helix or a helix-derived slow-wave structure

Definitions

  • the present invention relates to a traveling wave tube fitted with a sealed coupling device between its delay line and an external microwave circuit.
  • the invention is particularly applicable to broadband power traveling wave tubes, the delay line of which has the shape of a helix or a shape derived from a helix.
  • a traveling wave tube of this type essentially comprises: - an electron gun intended to emit an electron beam in a substantially rectilinear direction; - a delay line arranged downstream of the electron gun and enclosed in a cylindrical sheath which is concentric with it.
  • the electron beam is emitted in the extension of the longitudinal axis of the delay line, which it crosses from end to end. It is therefore in the sheath of the delay line that the interaction takes place between the electron beam and a microwave wave guided by the delay line.
  • the delay line is provided with an injection device and a device for extracting microwave energy; - a focal point with permanent magnets, concentric with the sheath of the delay line and extending over the entire length of the delay line. This focus creates in the sheath of the delay line a magnetic field having the effect of keeping the trajectories of electrons in the electron beam rectilinear; - a collector intended to collect the electron beam downstream of the delay line.
  • the traveling wave tube is generally connected to the external microwave circuits, on the input side of the delay line as well as on the output side thereof, by means of a connecting member forming one end of a transmission line. of these circuits.
  • this connecting member On the entry side of the delay line, this connecting member, by which the microwave energy is injected, generally has the structure of a coaxial line, the level of energy to be injected being low.
  • this connecting member On the delay line output side, this connecting member, by which the amplified microwave energy is extracted, has either the structure of a coaxial line or the structure of a molded waveguide, according to the level of energy to be extracted.
  • the electromagnetic coupling between a connecting member and one end of the delay line is done by means of a coupling finger having one end brazed to the corresponding end of the helix forming the delay line, and having a coupling surface situated opposite an end surface of the central conductor or of the molding of the connection member, no mechanical contact being established between the coupling finger and the connection member.
  • the various elements of the traveling wave tube and the connecting members form an assembly whose cavities communicate.
  • the parts of this assembly are tightly assembled and the assembly is itself hermetically closed so that the high vacuum (10 ⁇ 6 to 10 ⁇ 9 Torr) necessary for the operation of the electron gun can be created in its cavities.
  • the end of the connecting members opposite to the traveling wave tube is thus closed by a window, called microwave, which is permeable to microwave energy and impermeable to gases.
  • the volume of gas to be pumped in all of the cavities of the traveling wave tube and of the connecting elements is generally much greater than the volume of the cavities where it is functionally necessary to create a vacuum, that is to say -to say the cavities crossed by electrons.
  • the interior volume of a connecting member it is not uncommon for the interior volume of a connecting member to be of the same order of magnitude as the interior volume of the traveling wave tube itself.
  • pumping is most often carried out by the sheath of the delay line, the internal dimensions of which, as it delimits the interactive zone of the tube, are inversely proportional to the operating frequency of the tube, the pumping time for the high frequency tubes reach values incompatible with the requirements of industrial production.
  • the vacuum obtained is not always as high as it would be desirable.
  • a traveling wave tube comprising a sealed coupling device between its delay line and the transmission line of an external microwave circuit.
  • the invention applies to a traveling wave tube comprising a delay line contained in a sheath and a coupling finger for coupling the delay line to a transmission line of an external microwave circuit, the transmission line comprising a internal conductive core having an end surface, the coupling finger having a coupling surface located opposite the end surface of the conductive core of the transmission line.
  • this traveling wave tube comprises a microwave window comprising a wall permeable to microwave energy extending between the coupling surface of the coupling finger and the end surface of the conductive core of the line of transmission, the microwave window being impermeable to gases and being fixed to the traveling wave tube in a gas-tight manner.
  • the pumping of the gases contained in the cavities of the traveling wave tube creates a vacuum only in the traveling wave tube itself and the time required for this operation is considerably reduced compared to that taken in pumping the traveling wave tubes included in the prior art.
  • Figure 1 there is shown the part of a traveling wave tube located at the junction between the delay line 1 of the tube and an external circuit for extracting microwave energy from the tube.
  • the delay line 1 comprises a propeller 3 of axis XX ′, of copper for example, which is held in the center of a cylindrical metallic sheath 4 by three insulating support rods 5 offset by 120 ° one relative to the 'other.
  • the rods 5, which can be, for example, quartz, alumina, glucin or boron nitride, are brazed or clamped on the propeller 3.
  • the end of the sheath 4 located on the outlet side of the delay line 1 (end shown in the figure) abuts one end of a cylindrical conduit 6 which extends to the collector (not shown) of the traveling wave tube.
  • a focusing device is arranged concentrically with the sheath 5 and the conduit 6.
  • This focusing device is constituted by the succession along the axis X-X ′ of permanent annular magnets 7, two neighboring magnets having their polarities reversed.
  • the magnets 7 are separated from each other by annular polar masses 8.
  • a transmission line of an external circuit for extracting microwave energy from the traveling wave tube is coupled to the delay line 1.
  • the transmission line comprises a connecting member 2 having the form d '' a rectangular waveguide with molding.
  • This connecting member is used to establish the junction between the delay line 1 and a waveguide (not shown) of the external circuit.
  • the connecting member 2 comprises a bottom 9 and a cover 10, the bottom having an E-shaped section and comprising a base, two wings 21 perpendicular to the base and a molding 11 equidistant from the wings 21.
  • the molding 11 forms a conductive soul.
  • the connecting member 2 the end of which is defined by a cross section, extends between two polar masses 8 of the focusing device and its longitudinal axis is perpendicular to the axis X-X ′ of the delay line.
  • the microwave coupling between the delay line 1 and the connecting member 2 is carried out by means of a metallic coupling finger 12 having two perpendicular plane wings.
  • a wing 13, of trapezoidal shape is brazed at its free end to the end of the propeller 3.
  • the other wing 14, of rectangular shape is fixed to the sleeve 4, in the extension of the sleeve, at a notch 15 formed at the end of the sheath.
  • the notch 15 releases around the coupling finger an empty space 16 used for impedance matching.
  • the wing 14 of the coupling finger 12 is fixed to the sleeve so as to be parallel to the straight end section of the connecting member 2 and to be located opposite the molding 11.
  • the sleeve 4 has a slot 17 formed in its thickness and extending parallel to the axis of the sleeve. This slot has substantially the same thickness as the rectangular wing 14 of the coupling finger. The end of this wing is plugged into the slot 17 and the attachment of the coupling finger 12 to the sleeve 4 is completed by soldering.
  • the coupling finger 12 does not establish mechanical contact between the propeller 3 and the molding 11 of the connecting member 2.
  • the electromagnetic coupling is provided by capacitive effect between the outer surface of the rectangular wing 14 of the finger of coupling 12 and the end surface of the molding 11, through a microwave window 18 which will now be discussed.
  • the microwave window 18, which is rectangular in shape and fits into the cross section of the connecting member 2, comprises a metal frame 19, for example of ferronickel, and a flat plate 20 made of a low loss dielectric material , very high purity alumina or sapphire, for example.
  • the plate 20 is fixed to the frame 19 by brazing on edge. The window thus produced is permeable to microwave energy and impermeable to gases.
  • the window 18 is fixed in a sealed manner by its frame to the traveling wave tube, between the two pole masses 8 where part of the body extends. connection 2.
  • the window 18 is fixed opposite the coupling finger 12 so that its plate 20 is parallel to the rectangular wing 14, that is to say also to the cross section of the end of the connection 2.
  • the gap between the inner surface of the plate 20 and the surface, located opposite the rectangular wing 14 of the coupling finger is chosen to be as narrow as possible. The same applies to the gap separating the outer surface of the plate 20 and the straight end section of the molding 11.
  • the end of the connecting member 2 can be configured so that the molding 11 protrudes from the cross section of the end of the connecting member.
  • the end of the tubular conduit 6 is bevelled opposite the window 18 so that the interior surface of the plate 20 is completely free from the end of the delay line 1 .
  • the mounting of a traveling wave tube comprising a coupling device is carried out as follows: - Positioning and fixing of the part of the focusing device 8 adjacent to the cover 10 of the connecting member 2; - Positioning and fixing of the part of the focusing device 8 adjacent to the base 9 of the connecting member 2; - fixing of the microwave window 18 between the two polar masses of the focusing device where the connecting element 2 must be engaged; - assembly of the focusing device 8 and the connecting element 2; - assembly and soldering of the delay line assembly 1 - sheath 4 - coupling finger 12, previously assembled, to the focusing assembly 8 - element of connection 2.
  • the assembly is carried out as follows: the coupling finger 12 is brazed to the sheath 4 and the propeller 3 is brazed to the rods 5; then the propeller 3 - rods 5 assembly is introduced into the sheath 4 and is brazed there; finally the end of the propeller 3 is brazed to the coupling finger 12.
  • the measurements in order to verify the proper functioning of the various sets of elements are advantageously carried out before brazing, at the stage of general assembly. In this way the defective assemblies or elements can be discarded before the final assembly.
  • the step of assembling the two sets of elements mentioned above is completed by brazing. After which, the electron gun and the collector are mounted on either side of the delay line, respectively. Finally, the cavities of the traveling wave tube are emptied of the gases they contain.
  • FIGS. 3 and 4 show another embodiment of the invention suitable for the case where the connecting member of the external circuit comprises a coaxial line element.
  • the parts of the traveling wave tube identical to those of the traveling wave tube shown in Figures 1 and 2 have been designated by the same reference numerals. It is noted that these two embodiments do not differ either in the number or in the respective arrangement of their elements but in the conformation of two of them, the connecting member 30 and the microwave window 40.
  • the connecting member 30 consists of a central conductor 31 and an external conductor 32 in the form of a hollow cylinder, separated by a dielectric 33.
  • the central conductor 31 forms a conductive core.
  • the window 40 which has a metal frame 41 and a dielectric plate 42, has a circular shape.
  • the coupling finger 12 can be fixed to the sheath 4 by means of a ring brazed at the end of the sheath 4, the coupling finger extending radially inwards from the periphery of the ring.
  • the transmission line of the external microwave circuit could be connected directly to the traveling wave tube without the intermediary of a connecting member.
  • the surfaces located opposite the coupling finger, the link member and the microwave window could be parallel to an oblique plane to a cross section of the link member. These same surfaces could also not be flat and present a slight curvature.

Landscapes

  • Microwave Tubes (AREA)

Abstract

Dans un tube à onde progressive dont la ligne à retard (1) est couplée à une ligne de transmission (2) d'un circuit hyperfréquence externe par un doigt de couplage (12) ayant une surface de couplage située en vis-à-vis d'une surface d'extrémité de la ligne de transmission (2), une fenêtre hyperfréquence (18) s'étend entre la surface de couplage du doigt de couplage (12) et la surface d'extrémité de la ligne de transmission (2). Cette fenêtre (18) est perméable à l'énergie hyperfréquence et imperméable aux gaz. Elle est fixée de façon étanche au tube à onde progressive.In a traveling wave tube whose delay line (1) is coupled to a transmission line (2) of an external microwave circuit by a coupling finger (12) having a coupling surface located opposite an end surface of the transmission line (2), a microwave window (18) extends between the coupling surface of the coupling finger (12) and the end surface of the transmission line (2 ). This window (18) is permeable to microwave energy and impermeable to gases. It is tightly attached to the traveling wave tube.

Description

La présente invention concerne un tube à onde progressive muni d'un dispositif de couplage étanche entre sa ligne à retard et un circuit hyperfréquence externe.The present invention relates to a traveling wave tube fitted with a sealed coupling device between its delay line and an external microwave circuit.

L'invention s'applique particulièrement aux tubes à onde progressive de puissance, à large bande, dont la ligne à retard a la forme d'une hélice ou une forme dérivée d'une hélice.The invention is particularly applicable to broadband power traveling wave tubes, the delay line of which has the shape of a helix or a shape derived from a helix.

Un tube à onde progressive de ce type comporte essentiellement :
- un canon à électrons destiné à émettre un faisceau d'électrons selon une direction sensiblement recti­ligne ;
- une ligne à retard disposée en aval du canon à électrons et enclose dans un fourreau cylindrique qui lui est concentrique. Le faisceau d'électrons est émis dans le prolongement de l'axe longitudinal de la ligne à retard, qu'il traverse de bout en bout. C'est donc dans le fourreau de la ligne à retard que s'effectue l'interaction entre le faisceau d'électrons et une onde hyperfréquence guidée par la ligne à retard. La ligne à retard est munie d'un dispositif d'injection et d'un dispositif d'extraction de l'énergie hyperfréquence ;
- un focalisateur à aimants permanents, concen­trique au fourreau de la ligne à retard et s'étendant sur toute la longueur de la ligne à retard. Ce focalisateur crée dans le fourreau de la ligne à retard un champ magnéti­que ayant pour effet de maintenir rectilignes les trajec­toires de électrons du faisceau d'électrons ;
- un collecteur destiné à recueillir le fais­ceau d'électrons en aval de la ligne à retard.A traveling wave tube of this type essentially comprises:
- an electron gun intended to emit an electron beam in a substantially rectilinear direction;
- a delay line arranged downstream of the electron gun and enclosed in a cylindrical sheath which is concentric with it. The electron beam is emitted in the extension of the longitudinal axis of the delay line, which it crosses from end to end. It is therefore in the sheath of the delay line that the interaction takes place between the electron beam and a microwave wave guided by the delay line. The delay line is provided with an injection device and a device for extracting microwave energy;
- a focal point with permanent magnets, concentric with the sheath of the delay line and extending over the entire length of the delay line. This focus creates in the sheath of the delay line a magnetic field having the effect of keeping the trajectories of electrons in the electron beam rectilinear;
- a collector intended to collect the electron beam downstream of the delay line.

Le tube à onde progressive est généralement relié aux circuits hyperfréquences externes, du côté de l'entrée de la ligne à retard comme du côté de sa sortie, par l'intermédiaire d'un organe de liaison formant une extrémité d'une ligne de transmission de ces circuits. Du côté de l'entrée de la ligne à retard, cet organe de liaison, par lequel se fait l'injection de l'énergie hyper­fréquence, a généralement la structure d'une ligne coaxiale, le niveau d'énergie à injecter étant faible. Du côté de la sortie de ligne à retard, cet organe de liaison, par lequel se fait l'extraction de l'énergie hyperfréquence amplifiée a soit la structure d'une ligne coaxiale soit la structure d'un guide d'onde mouluré, selon le niveau de l'énergie à extraire.The traveling wave tube is generally connected to the external microwave circuits, on the input side of the delay line as well as on the output side thereof, by means of a connecting member forming one end of a transmission line. of these circuits. On the entry side of the delay line, this connecting member, by which the microwave energy is injected, generally has the structure of a coaxial line, the level of energy to be injected being low. On the delay line output side, this connecting member, by which the amplified microwave energy is extracted, has either the structure of a coaxial line or the structure of a molded waveguide, according to the level of energy to be extracted.

De façon connue, le couplage électromagnétique entre un organe de liaison et une extrémité de la ligne à retard se fait au moyen d'un doigt de couplage ayant une extrémité brasée à l'extrémité correspondante de l'hélice formant la ligne à retard, et présentant une surface de couplage située en regard d'une surface d'extrémité du conducteur central ou de la moulure de l'organe de liaison, aucun contact mécanique n'étant établi entre le doigt de couplage et l'organe de liaison.In known manner, the electromagnetic coupling between a connecting member and one end of the delay line is done by means of a coupling finger having one end brazed to the corresponding end of the helix forming the delay line, and having a coupling surface situated opposite an end surface of the central conductor or of the molding of the connection member, no mechanical contact being established between the coupling finger and the connection member.

Les divers éléments du tube à onde progressive et les organes de liaison forment un ensemble dont les cavités communiquent. Les parties de cet ensemble sont assemblées de façon étanche et l'ensemble est lui-même fermé hermétiquement de façon que le vide poussé (10⁻⁶ à 10⁻⁹ Torr) nécessaire au fonctionnement du canon à électrons puisse être créé dans ses cavités. L'extrémité des organes de liaison opposée au tube à onde progressive est ainsi obturée par une fenêtre, dite hyperfréquence, qui est permé­able à l'énergie hyperfréquence et imperméable aux gaz.The various elements of the traveling wave tube and the connecting members form an assembly whose cavities communicate. The parts of this assembly are tightly assembled and the assembly is itself hermetically closed so that the high vacuum (10⁻⁶ to 10⁻⁹ Torr) necessary for the operation of the electron gun can be created in its cavities. The end of the connecting members opposite to the traveling wave tube is thus closed by a window, called microwave, which is permeable to microwave energy and impermeable to gases.

Cet agencement d'un tube à onde progressive et des organes de liaison aux circuits externes, qui fait partie de l'état de la technique, présente un inconvénient majeur.This arrangement of a traveling wave tube and connecting members to external circuits, which is part of the state of the art, has a major drawback.

En effet, le volume de gaz à pomper dans l'ensemble des cavités du tube à onde progressive et des éléments de liaison est généralement beaucoup plus important que le volume des cavités où il est fonctionnellement néces­saire de créer le vide, c'est-à-dire les cavités traversées par les électrons. De fait, il n'est pas rare que le volume intérieur d'un organe de liaison soit du même ordre de grandeur que le volume intérieur du tube à onde progressive lui-même. Comme le pompage est réalisé le plus souvent par le fourreau de la ligne à retard, dont les dimensions intérieures, en tant qu'il délimite la zone interactive du tube, sont inversement proportionnelles à la fréquence de fonctionnement du tube, le temps de pompage pour les tubes à fréquence élevée atteint des valeurs incompatibles avec les exigences d'une production industrielle. En outre, le vide obtenu n'est pas toujours aussi poussé qu'il serait souhaitable.Indeed, the volume of gas to be pumped in all of the cavities of the traveling wave tube and of the connecting elements is generally much greater than the volume of the cavities where it is functionally necessary to create a vacuum, that is to say -to say the cavities crossed by electrons. In fact, it is not uncommon for the interior volume of a connecting member to be of the same order of magnitude as the interior volume of the traveling wave tube itself. As pumping is most often carried out by the sheath of the delay line, the internal dimensions of which, as it delimits the interactive zone of the tube, are inversely proportional to the operating frequency of the tube, the pumping time for the high frequency tubes reach values incompatible with the requirements of industrial production. In addition, the vacuum obtained is not always as high as it would be desirable.

C'est pour remédier à ces inconvénients que l'on prévoit, conformément à l'invention, un tube à onde progressive comportant un dispositif de couplage étanche entre sa ligne à retard et la ligne de transmission d'un circuit hyperfréquence externe.It is to remedy these drawbacks that provision is made, in accordance with the invention, for a traveling wave tube comprising a sealed coupling device between its delay line and the transmission line of an external microwave circuit.

L'invention s'applique à un tube à onde pro­gressive comportant une ligne à retard contenue dans un fourreau et un doigt de couplage pour coupler la ligne à retard à une ligne de transmission d'un circuit hyperfré­quence externe, la ligne de transmission comprenant une âme conductrice interne présentant une surface d'extrémité, le doigt de couplage présentant une surface de couplage située en regard de la surface d'extrémité de l'âme conduc­trice de la ligne de transmission.The invention applies to a traveling wave tube comprising a delay line contained in a sheath and a coupling finger for coupling the delay line to a transmission line of an external microwave circuit, the transmission line comprising a internal conductive core having an end surface, the coupling finger having a coupling surface located opposite the end surface of the conductive core of the transmission line.

Selon l'invention, ce tube à onde progressive comporte une fenêtre hyperfréquence comprenant une paroi perméable à l'énergie hyperfréquence s'étendant entre la surface de couplage du doigt de couplage et la surface d'extrémité de l'âme conductrice de la ligne de transmission, la fenêtre hyperfréquence étant imperméable aux gaz et étant fixée au tube à onde progressive de façon étanche aux gaz.According to the invention, this traveling wave tube comprises a microwave window comprising a wall permeable to microwave energy extending between the coupling surface of the coupling finger and the end surface of the conductive core of the line of transmission, the microwave window being impermeable to gases and being fixed to the traveling wave tube in a gas-tight manner.

Grâce à cette disposition, le pompage des gaz contenus dans les cavités du tube à onde progressive ne crée le vide que dans le tube à onde progressive lui-­même et le temps nécessaire à cette opération est considéra­blement réduit par rapport à celui que prenait le pompage des tubes à onde progressive compris dans l'état de la technique.Thanks to this arrangement, the pumping of the gases contained in the cavities of the traveling wave tube creates a vacuum only in the traveling wave tube itself and the time required for this operation is considerably reduced compared to that taken in pumping the traveling wave tubes included in the prior art.

L'invention va être expliquée en détail dans ce qui suit, au moyen de la description d'un mode de réalisa­tion préféré de l'invention. Cette description sera faite en référence aux dessins annexés parmi lesquels :

  • - la figure 1 est une vue partielle schématique en coupe longitudinale d'un tube à onde progressive compor­tant un dispositif de couplage étanche entre une ligne à retard en hélice et un guide d'onde mouluré ;
  • - la figure 2 est une vue en coupe transversale partielle du tube à onde progressive représenté sur la figure 1 ;
  • - la figure 3 est une vue partielle schématique en coupe longitudinale d'un tube à onde progressive compor­tant un dispositif de couplage selon l'invention entre une ligne à retard en hélice et une ligne coaxiale ; et
  • - la figure 4 est une vue en coupe transversale partielle du tube à onde progressive représenté sur la figure 3.
The invention will be explained in detail in the following, by means of the description of a preferred embodiment of the invention. This description will be made with reference to the accompanying drawings, in which:
  • - Figure 1 is a schematic partial view in longitudinal section of a traveling wave tube comprising a sealed coupling device between a helical delay line and a molded waveguide;
  • - Figure 2 is a partial cross-sectional view of the traveling wave tube shown in Figure 1;
  • - Figure 3 is a schematic partial view in longitudinal section of a traveling wave tube comprising a coupling device according to the invention between a helical delay line and a coaxial line; and
  • FIG. 4 is a partial cross-sectional view of the traveling wave tube shown in FIG. 3.

Sur la figure 1, on a représenté la partie d'un tube à onde progressive située au niveau de la jonction entre la ligne à retard 1 du tube et un circuit externe d'extraction de l'énergie hyperfréquence du tube.In Figure 1, there is shown the part of a traveling wave tube located at the junction between the delay line 1 of the tube and an external circuit for extracting microwave energy from the tube.

Le ligne à retard 1 comporte une hélice 3 d'axe X-X′, de cuivre par exemple, qui est maintenue au centre d'un fourreau métallique cylindrique 4 par trois tiges de support 5 isolantes décalées de 120° l'une par rapport à l'autre. Les tiges 5, qui peuvent être, par exem­ple, en quartz, en alumine, en glucine ou en nitrure de bore, sont brasées ou serrées sur l'hélice 3. L'extrémité du fourreau 4 située du côté de la sortie de la ligne à retard 1 (extrémité représentée sur la figure) aboute une ex­trémité d'un conduit 6 cylindrique qui s'étend jusqu'au collecteur (non représenté) du tube à onde progressive.The delay line 1 comprises a propeller 3 of axis XX ′, of copper for example, which is held in the center of a cylindrical metallic sheath 4 by three insulating support rods 5 offset by 120 ° one relative to the 'other. The rods 5, which can be, for example, quartz, alumina, glucin or boron nitride, are brazed or clamped on the propeller 3. The end of the sheath 4 located on the outlet side of the delay line 1 (end shown in the figure) abuts one end of a cylindrical conduit 6 which extends to the collector (not shown) of the traveling wave tube.

Un focaliseur est disposé concentriquement au fourreau 5 et au conduit 6. Ce focalisateur est constitué par la succession selon l'axe X-X′ d'aimants permanents 7 annulaires, deux aimants voisins ayant leurs polarités inversées. Les aimants 7 sont séparés les uns des autres par des masses polaires annulaires 8.A focusing device is arranged concentrically with the sheath 5 and the conduit 6. This focusing device is constituted by the succession along the axis X-X ′ of permanent annular magnets 7, two neighboring magnets having their polarities reversed. The magnets 7 are separated from each other by annular polar masses 8.

Une ligne de transmission d'un circuit externe d'extraction de l'énergie hyperfréquence du tube à onde progressive est couplée à la ligne à retard 1. Au niveau du tube, la ligne de transmission comporte un organe de liaison 2 ayant la forme d'un guide d'onde rectangulaire à moulure. Cet organe de liaison sert à établir la jonction entre la ligne à retard 1 et un guide d'onde (non représenté) du circuit externe. L'organe de liaison 2 comporte un fond 9 et un couvercle 10, le fond ayant une section en forme de E et comprenant une base, deux ailes 21 perpendiculaires à la base et une moulure 11 équidistante des ailes 21. La moulure 11 forme une âme conductrice. L'organe de liaison 2, dont l'extrémité est définie par une section droite, s'étend entre deux masses polaires 8 du focalisateur et son axe longitudinal est perpendiculaire à l'axe X-X′ de la ligne à retard.A transmission line of an external circuit for extracting microwave energy from the traveling wave tube is coupled to the delay line 1. At the level of the tube, the transmission line comprises a connecting member 2 having the form d '' a rectangular waveguide with molding. This connecting member is used to establish the junction between the delay line 1 and a waveguide (not shown) of the external circuit. The connecting member 2 comprises a bottom 9 and a cover 10, the bottom having an E-shaped section and comprising a base, two wings 21 perpendicular to the base and a molding 11 equidistant from the wings 21. The molding 11 forms a conductive soul. The connecting member 2, the end of which is defined by a cross section, extends between two polar masses 8 of the focusing device and its longitudinal axis is perpendicular to the axis X-X ′ of the delay line.

Le couplage hyperfréquence entre la ligne à retard 1 et l'organe de liaison 2 est réalisé au moyen d'un doigt de couplage 12 métallique ayant deux ailes planes perpendiculaires. Une aile 13, de forme trapézoïdale, est brasée à son extrémité libre à l'extrémité de l'hélice 3. L'autre aile 14, de forme rectangulaire, est fixée au fourreau 4, dans le prolongement du fourreau, au niveau d'une encoche 15 pratiquée à l'extrémité du fourreau. L'encoche 15 dégage autour du doigt de couplage un espace vide 16 servant à l'adaptation d'impédance.The microwave coupling between the delay line 1 and the connecting member 2 is carried out by means of a metallic coupling finger 12 having two perpendicular plane wings. A wing 13, of trapezoidal shape, is brazed at its free end to the end of the propeller 3. The other wing 14, of rectangular shape, is fixed to the sleeve 4, in the extension of the sleeve, at a notch 15 formed at the end of the sheath. The notch 15 releases around the coupling finger an empty space 16 used for impedance matching.

L'aile 14 du doigt de couplage 12 est fixée au fourreau de façon à être parallèle à la section droite d'extrémité de l'organe de liaison 2 et à être située en vis-à-vis de la moulure 11. Sur le mode de réalisation représenté, le fourreau 4 comporte une fente 17 pratiquée dans son épaisseur et s'étendant parallèlement à l'axe du fourreau. Cette fente a sensiblement la même épaisseur que l'aile rectangulaire 14 du doigt de couplage. L'extré­mité de cette aile est enfichée dans la fente 17 et la fixation du doigt de couplage 12 au fourreau 4 est achevée par un brasage.The wing 14 of the coupling finger 12 is fixed to the sleeve so as to be parallel to the straight end section of the connecting member 2 and to be located opposite the molding 11. In the mode embodiment shown, the sleeve 4 has a slot 17 formed in its thickness and extending parallel to the axis of the sleeve. This slot has substantially the same thickness as the rectangular wing 14 of the coupling finger. The end of this wing is plugged into the slot 17 and the attachment of the coupling finger 12 to the sleeve 4 is completed by soldering.

Le doigt de couplage 12 n'établit pas de contact mécanique entre l'hélice 3 et la moulure 11 de l'organe de liaison 2. Le couplage électromagnétique est assuré par effet capacitif entre la surface extérieure de l'aile rectangulaire 14 du doigt de couplage 12 et la surface d'extrémité de la moulure 11, au travers d'une fenêtre hyperfréquence 18 dont il va être question main­tenant.The coupling finger 12 does not establish mechanical contact between the propeller 3 and the molding 11 of the connecting member 2. The electromagnetic coupling is provided by capacitive effect between the outer surface of the rectangular wing 14 of the finger of coupling 12 and the end surface of the molding 11, through a microwave window 18 which will now be discussed.

La fenêtre hyperfréquence 18, qui est de forme rectangulaire et s'inscrit dans la section droite de l'organe de liaison 2, comporte un cadre 19 métallique, de ferronickel par exemple, et une plaque plane 20 réalisée dans un matériau diélectrique à faible perte, de l'alumine à très haute pureté ou du saphir, par exemple. Avantageuse­ment la plaque 20 est fixée au cadre 19 par un brasage sur chant. La fenêtre ainsi réalisée est perméable à l'éner­gie hyperfréquence et imperméable aux gaz.The microwave window 18, which is rectangular in shape and fits into the cross section of the connecting member 2, comprises a metal frame 19, for example of ferronickel, and a flat plate 20 made of a low loss dielectric material , very high purity alumina or sapphire, for example. Advantageously, the plate 20 is fixed to the frame 19 by brazing on edge. The window thus produced is permeable to microwave energy and impermeable to gases.

La fenêtre 18 est fixée de façon étanche par son cadre au tube à onde progressive, entre les deux masses polaires 8 où s'étend une partie de l'organe de liaison 2. La fenêtre 18 est fixée en regard du doigt de couplage 12 de façon que sa plaque 20 soit parallèle à l'aile rectangulaire 14, c'est-à-dire aussi à la section droite d'extrémité de l'organe de liaison 2. L'interstice entre la surface intérieure de la plaque 20 et la surface, située en vis-à-vis de l'aile rectangulaire 14 du doigt de couplage est choisi aussi étroit que possible. Il en va de même pour l'interstice séparant la surface extérieure dse la plaque 20 et la section droite d'extrémité de la moulure 11. A cet effet, lorsque le cadre 19 est plus épais que la plaque 20, comme c'est le cas dans le mode de réali­sation représenté, l'extrémité de l'organe de liaison 2 peut être configurée de façon que la moulure 11 fasse saillie sur la section droite d'extrémité de l'organe de liaison.The window 18 is fixed in a sealed manner by its frame to the traveling wave tube, between the two pole masses 8 where part of the body extends. connection 2. The window 18 is fixed opposite the coupling finger 12 so that its plate 20 is parallel to the rectangular wing 14, that is to say also to the cross section of the end of the connection 2. The gap between the inner surface of the plate 20 and the surface, located opposite the rectangular wing 14 of the coupling finger is chosen to be as narrow as possible. The same applies to the gap separating the outer surface of the plate 20 and the straight end section of the molding 11. For this purpose, when the frame 19 is thicker than the plate 20, as is the case in the embodiment shown, the end of the connecting member 2 can be configured so that the molding 11 protrudes from the cross section of the end of the connecting member.

Pour des raisons d'adaptation d'impédance, l'extrémité du conduit tubulaire 6 est biseautée en regard de la fenêtre 18 de façon que la surface intérieure de la plaque 20 soit totalement dégagée par rapport à l'extré­mité de la ligne à retard 1.For reasons of impedance adaptation, the end of the tubular conduit 6 is bevelled opposite the window 18 so that the interior surface of the plate 20 is completely free from the end of the delay line 1 .

Le montage d'un tube à onde progressive compor­tant un dispositif de couplage conforme à l'invention s'effectue de la façon suivante :
- positionnement et fixation de la partie du focalisateur 8 adjacente au couvercle 10 de l'organe de liaison 2 ;
- positionnement et fixation de la partie du focalisateur 8 adjacente à la base 9 de l'organe de liaison 2 ;
- fixation de la fenêtre hyperfréquence 18 entre les deux masses polaires du focalisateur où l'élément de liaison 2 doit être engagé ;
- assemblage du focalisateur 8 et de l'élément de liaison 2 ;
- assemblage et brasage de l'ensemble ligne à retard 1 - fourreau 4 - doigt de couplage 12, préalable­ment assemblé, à l'ensemble focalisateur 8 - élément de liaison 2. En ce qui concerne le premier de ces ensembles, le montage s'effectue de la façon suivante : le doigt de cou­plage 12 est brasé au fourreau 4 et l'hélice 3 est brasée sur les tiges 5 ; puis l'ensemble hélice 3 - tiges 5 est introduit dans le fourreau 4 et y est brasé ; enfin l'extré­mité de l'hélice 3 est brasée au doigt de couplage 12.The mounting of a traveling wave tube comprising a coupling device according to the invention is carried out as follows:
- Positioning and fixing of the part of the focusing device 8 adjacent to the cover 10 of the connecting member 2;
- Positioning and fixing of the part of the focusing device 8 adjacent to the base 9 of the connecting member 2;
- fixing of the microwave window 18 between the two polar masses of the focusing device where the connecting element 2 must be engaged;
- assembly of the focusing device 8 and the connecting element 2;
- assembly and soldering of the delay line assembly 1 - sheath 4 - coupling finger 12, previously assembled, to the focusing assembly 8 - element of connection 2. As regards the first of these assemblies, the assembly is carried out as follows: the coupling finger 12 is brazed to the sheath 4 and the propeller 3 is brazed to the rods 5; then the propeller 3 - rods 5 assembly is introduced into the sheath 4 and is brazed there; finally the end of the propeller 3 is brazed to the coupling finger 12.

Par suite de l'absence de lien mécanique entre la ligne à retard 1 et l'organe de liaison 2, les mesures en vue de vérifier le bon fonctionnement des diffé­rents ensembles d'éléments sont avantageusement effectuées avant le brasage, au stade de l'assemblage général. De la sorte les ensembles ou les éléments défectueux peuvent être rebutés avant l'assemblage définitif. Lorsque les mesures donnent des résultats positifs, l'étape d'assemblage des deux ensembles d'éléments mentionnés ci-dessus est achevée par brasage. Après quoi, le canon à électrons et le collecteur sont montés respectivement de part et d'autre de la ligne à retard. Enfin, les cavités du tube à onde progressive sont vidées des gaz qu'elles contiennent.Due to the absence of a mechanical link between the delay line 1 and the connecting member 2, the measurements in order to verify the proper functioning of the various sets of elements are advantageously carried out before brazing, at the stage of general assembly. In this way the defective assemblies or elements can be discarded before the final assembly. When the measurements give positive results, the step of assembling the two sets of elements mentioned above is completed by brazing. After which, the electron gun and the collector are mounted on either side of the delay line, respectively. Finally, the cavities of the traveling wave tube are emptied of the gases they contain.

Sur les figures 3 et 4, on a représenté un autre mode de réalisation de l'invention adapté au cas où l'organe de liaison du circuit externe comprend un élément de ligne coaxiale. Sur ces figures, les parties du tube à onde progressive identiques à celles du tube à onde pro­gressive représenté sur les figures 1 et 2 ont été désignées par les mêmes chiffres de repère. On remarque que ces deux modes de réalisation ne diffèrent ni par le nombre, ni par la disposition respective de leurs éléments mais par la conformation de deux d'entre eux, l'organe de liaison 30 et la fenêtre hyperfréquence 40.FIGS. 3 and 4 show another embodiment of the invention suitable for the case where the connecting member of the external circuit comprises a coaxial line element. In these figures, the parts of the traveling wave tube identical to those of the traveling wave tube shown in Figures 1 and 2 have been designated by the same reference numerals. It is noted that these two embodiments do not differ either in the number or in the respective arrangement of their elements but in the conformation of two of them, the connecting member 30 and the microwave window 40.

L'organe de liaison 30 est constitué d'un conducteur central 31 et d'un conducteur extérieur 32 en forme de cylindre creux, séparés par un diélectrique 33. Le conducteur central 31 forme une âme conductrice. La fenêtre 40, qui comporte un cadre métallique 41 et une plaque de diélectrique 42, a une forme circulaire.The connecting member 30 consists of a central conductor 31 and an external conductor 32 in the form of a hollow cylinder, separated by a dielectric 33. The central conductor 31 forms a conductive core. The window 40, which has a metal frame 41 and a dielectric plate 42, has a circular shape.

La présente invention n'est pas limitée au mode de réali­sation qui vient d'être décrit ; elle est susceptible de variantes et de modifi­cations qui sont à la portée de l'homme de l'art, sans sortir du cadre des revendications annexées. En particulier la fixation du doigt de couplage 12 au fourreau 4 pourrait être réalisée au moyen d'une bague brasée à l'extrémité du fourreau 4, le doigt de couplage s'étendant radialement vers l'intérieur à partir de la périphérie de la bague. La ligne de trans­mission du circuit hyperfréquence externe pourrait être connectée direc­tement au tube à onde progressive sans l'intermédiaire d'un organe de liaison. Les surfaces situées en vis-à-vis du doigt de couplage, de l'organe de liaison et de la fenêtre hyperfréquence pourraient être parallèles à un plan oblique à une section droite de l'organe de liaison. Ces mêmes surfaces pourraient aussi ne pas être planes et présenter une légère courbure.The present invention is not limited to the embodiment which has just been described; it is subject to variations and modifications which are within the reach of ordinary skill in the art, without departing from the scope of the appended claims. In particular, the coupling finger 12 can be fixed to the sheath 4 by means of a ring brazed at the end of the sheath 4, the coupling finger extending radially inwards from the periphery of the ring. . The transmission line of the external microwave circuit could be connected directly to the traveling wave tube without the intermediary of a connecting member. The surfaces located opposite the coupling finger, the link member and the microwave window could be parallel to an oblique plane to a cross section of the link member. These same surfaces could also not be flat and present a slight curvature.

Claims (2)

1. Tube à onde progressive comportant une ligne à retard (1) d'axe XX′ contenue dans un fourreau (4) et un doigt de couplage (12) pour coupler la ligne à retard (1) à une ligne de transmission (2 ; 30) d'un circuit hyperfréquence externe, non située dans le prolongement de la ligne à retard (1), la ligne de transmission (2 ; 30) comprenant une âme conductrice (11 ; 31) interne présentant une surface d'extrémité, le doigt de couplage (12) présentant une surface de couplage située en regard de la surface d'extrémité de l'âme conductrice (11 ; 31) de la ligne de transmission (2 ; 30), caractérisé en ce qu'il comporte une fenêtre hyperfréquence (18 ; 40) comprenant une paroi (20 ; 42) perméable à l'éner­gie hyperfréquence s'étendant entre la surface de couplage du doigt de couplage (12) et la surface d'extrémité de l'âme conductrice (11 ; 31) de la ligne de transmission (2 ; 30), la fenêtre hyperfréquence (18 ; 40) étant imperméable aux gaz et étant fixée au tube à onde progressive de façon étanche aux gaz.1. Traveling wave tube comprising a delay line (1) of axis XX ′ contained in a sheath (4) and a coupling finger (12) for coupling the delay line (1) to a transmission line (2 ; 30) an external microwave circuit, not located in the extension of the delay line (1), the transmission line (2; 30) comprising an internal conductive core (11; 31) having an end surface, the coupling finger (12) having a coupling surface located opposite the end surface of the conductive core (11; 31) of the transmission line (2; 30), characterized in that it comprises a microwave window (18; 40) comprising a wall (20; 42) permeable to microwave energy extending between the coupling surface of the coupling finger (12) and the end surface of the conductive core (11; 31) of the transmission line (2; 30), the microwave window (18; 40) being impermeable to gases and being fixed e the wave tube of gastight manner. 2. Tube à onde progressive selon la revendication 1, caractérisé en ce que la fenêtre (18 ; 40) est inscrite dans une section droite de l'élément de transmission (2 ; 30).2. traveling wave tube according to claim 1, characterized in that the window (18; 40) is inscribed in a cross section of the transmission element (2; 30).
EP89402725A 1988-10-11 1989-10-03 Travelling-wave tube with a gas-tight coupling arrangement between its slow-wave circuit and an external microwave circuit Withdrawn EP0364335A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8813342 1988-10-11
FR8813342A FR2637731A1 (en) 1988-10-11 1988-10-11 PROGRESSIVE WAVE TUBE PROVIDED WITH A WATERPROOF COUPLING DEVICE BETWEEN THE DELAYED LINE AND AN EXTERNAL MICROWAVE CIRCUIT

Publications (1)

Publication Number Publication Date
EP0364335A1 true EP0364335A1 (en) 1990-04-18

Family

ID=9370896

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402725A Withdrawn EP0364335A1 (en) 1988-10-11 1989-10-03 Travelling-wave tube with a gas-tight coupling arrangement between its slow-wave circuit and an external microwave circuit

Country Status (4)

Country Link
US (1) US4985659A (en)
EP (1) EP0364335A1 (en)
JP (1) JPH02165544A (en)
FR (1) FR2637731A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663463A1 (en) * 1990-06-19 1991-12-20 Thomson Tubes Electroniques PROGRESSIVE WAVE TUBE PROVIDED WITH A COUPLING DEVICE BETWEEN ITS DELAYED LINE AND AN EXTERNAL MICROWAVE CIRCUIT.

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19542525C2 (en) * 1995-11-15 1997-12-11 Krohne Messtechnik Kg Microwave window
US5986208A (en) * 1996-03-19 1999-11-16 Pacific Coast Technologies, Inc. Waveguide window assembly and microwave electronics package
FR2747228B1 (en) * 1996-04-05 1998-07-17 Thomson Csf LOW-LOSS FERRITE BETWEEN 1 MHZ AND 100 MHZ AND METHOD FOR PRODUCING THE SAME
US6483242B1 (en) * 1999-10-25 2002-11-19 Hughes Electronics Corp. Traveling wave tube system with output waveguide-coupler termination
FR2833749B1 (en) * 2001-12-14 2004-04-02 Thales Sa COOLING OF AN ELECTRONIC TUBE
US7498277B2 (en) * 2003-01-28 2009-03-03 Hbi Branded Apparel Enterprises, Llc Pad printing on textile substrates

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1064117B (en) * 1956-09-15 1959-08-27 Deutsche Elektronik Gmbh Device for decoupling the high-frequency energy generated in a magnetic field tube
FR1434049A (en) * 1964-05-27 1966-04-01 Siemens Ag Waveguide for the transmission of very short electromagnetic waves, especially for millimeter wave tubes
FR2054505A1 (en) * 1969-07-18 1971-04-23 Thomson Csf
US3939443A (en) * 1972-01-07 1976-02-17 Finommechanikai Vallalat Frequency-selective coupling for high-frequency electromagnetic waves
FR2485801A1 (en) * 1980-06-27 1981-12-31 Thomson Csf Coupler for static focussed travelling wave tube - has rib connected to slow wave helix and guide of similar dimension to focussing magnet
EP0274950A1 (en) * 1986-12-19 1988-07-20 Thomson-Csf Broad-band coupling device between the delay line of a travelling-wave tube and the external energy-transmitting circuit, and travelling-wave tube comprising such a device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770784A (en) * 1952-06-25 1956-11-13 Robert H Hatch Metal painted aperture or window for waveguides
US2849651A (en) * 1952-08-23 1958-08-26 Bell Telephone Labor Inc Traveling wave tubes
GB796883A (en) * 1955-07-15 1958-06-18 Gen Electric Co Ltd Improvements in or relating to window seals closing apertures in metal bodies
NL105112C (en) * 1958-05-15
DE2516428C2 (en) * 1975-04-15 1977-03-24 Siemens Ag HIKING FIELD TUBE WITH A COIL-LIKE DELAY LINE
DE2907762A1 (en) * 1979-02-28 1980-09-04 Siemens Ag GAS DENSITY, HIGH-FREQUENCY TRANSFERABLE WINDOW ARRANGEMENT IN A COAXIAL PIPE, ESPECIALLY FOR WALKER PIPES

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1064117B (en) * 1956-09-15 1959-08-27 Deutsche Elektronik Gmbh Device for decoupling the high-frequency energy generated in a magnetic field tube
FR1434049A (en) * 1964-05-27 1966-04-01 Siemens Ag Waveguide for the transmission of very short electromagnetic waves, especially for millimeter wave tubes
FR2054505A1 (en) * 1969-07-18 1971-04-23 Thomson Csf
US3939443A (en) * 1972-01-07 1976-02-17 Finommechanikai Vallalat Frequency-selective coupling for high-frequency electromagnetic waves
FR2485801A1 (en) * 1980-06-27 1981-12-31 Thomson Csf Coupler for static focussed travelling wave tube - has rib connected to slow wave helix and guide of similar dimension to focussing magnet
EP0274950A1 (en) * 1986-12-19 1988-07-20 Thomson-Csf Broad-band coupling device between the delay line of a travelling-wave tube and the external energy-transmitting circuit, and travelling-wave tube comprising such a device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663463A1 (en) * 1990-06-19 1991-12-20 Thomson Tubes Electroniques PROGRESSIVE WAVE TUBE PROVIDED WITH A COUPLING DEVICE BETWEEN ITS DELAYED LINE AND AN EXTERNAL MICROWAVE CIRCUIT.
EP0462863A1 (en) * 1990-06-19 1991-12-27 Thomson Tubes Electroniques Travelling-wave tube with a coupling arrangement between its slow-wave circuit and an external microwave circuit

Also Published As

Publication number Publication date
JPH02165544A (en) 1990-06-26
FR2637731A1 (en) 1990-04-13
US4985659A (en) 1991-01-15

Similar Documents

Publication Publication Date Title
EP0402549B1 (en) Travelling-wave tube with a helical delay line made of boron nitride and attached to the vacuum tube
EP0364335A1 (en) Travelling-wave tube with a gas-tight coupling arrangement between its slow-wave circuit and an external microwave circuit
EP2953203A1 (en) Device for transmitting energy from one medium to another
EP0037309B1 (en) Travelling-wave tube with coupled cavities and with periodic permanent magnet focussing, and amplifier unit with such a tube
EP0368729A1 (en) Vacuum-tight window for a microwave tube, and microwave tube with a window
FR2543734A1 (en) PROGRESSIVE WAVE TUBE HAVING A HOLLOW GROOVE SLEEVE AND METHOD OF MANUFACTURE
EP0102288B1 (en) Travelling wave tube with suppression means for parasitic oscillation
EP0341107B1 (en) Travelling-wave tube with a coupling arrangement between its delay line and external microwave circuits
FR2756970A1 (en) HYPERFREQUENCY TUBE WITH LONGITUDINAL INTERACTION WITH CAVITY OUTPUT OUTSIDE THE COLLECTOR
EP0440530A1 (en) Multiple-beam microwave tube with coaxial outlet
EP1251544B1 (en) Microwave amplifier electron tube with miniature entry plug and method of fabrication
FR2471042A1 (en) PROGRESSIVE PROGRESSIVE WAVE TUBE OF PROPELLER TYPE AND LARGE BANDWIDTH
FR2655771A1 (en) WIDEBAND HYPERFREQUENCY WINDOW WITH MINIATURIZED DIMENSIONS FOR ELECTRONIC TUBES.
EP1466343B1 (en) Electronic tube with simplified collector
EP0119362B1 (en) Coaxial resonators for grid tubes
EP0274950A1 (en) Broad-band coupling device between the delay line of a travelling-wave tube and the external energy-transmitting circuit, and travelling-wave tube comprising such a device
EP0462863A1 (en) Travelling-wave tube with a coupling arrangement between its slow-wave circuit and an external microwave circuit
FR2790595A1 (en) Helix type slow wave circuit for traveling wave tube, has rectangular cross sectional support with holes, having dielectric to fix helix in vacuum envelope
EP0122186B1 (en) Microwave generator
FR2485801A1 (en) Coupler for static focussed travelling wave tube - has rib connected to slow wave helix and guide of similar dimension to focussing magnet
EP1328004A2 (en) Electron tube with a cooled tubular sheath
FR2688342A1 (en) Microwave electron tube
WO2024126903A1 (en) Differential measurement torus for an electrical differential protection apparatus and associated electrical differential protection apparatus
FR2518802A1 (en) DELAY LINE FOR PROGRESSIVE WAVE TUBE
EP0482986A1 (en) Collector for a microwave tube and microwave tube comprising such a collector

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19900424

17Q First examination report despatched

Effective date: 19920624

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19921105