EP0401065A1 - Verfahren zur Herstellung einer wendelförmigen Verzögerungsleitung - Google Patents

Verfahren zur Herstellung einer wendelförmigen Verzögerungsleitung Download PDF

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Publication number
EP0401065A1
EP0401065A1 EP90401213A EP90401213A EP0401065A1 EP 0401065 A1 EP0401065 A1 EP 0401065A1 EP 90401213 A EP90401213 A EP 90401213A EP 90401213 A EP90401213 A EP 90401213A EP 0401065 A1 EP0401065 A1 EP 0401065A1
Authority
EP
European Patent Office
Prior art keywords
supports
construction
dielectric
propeller
traveling wave
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.)
Granted
Application number
EP90401213A
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English (en)
French (fr)
Other versions
EP0401065B1 (de
Inventor
Pierre Nugues
Dominique Henry
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 Electron Devices SA
Original Assignee
Thomson Tubes Electroniques
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Filing date
Publication date
Application filed by Thomson Tubes Electroniques filed Critical Thomson Tubes Electroniques
Publication of EP0401065A1 publication Critical patent/EP0401065A1/de
Application granted granted Critical
Publication of EP0401065B1 publication Critical patent/EP0401065B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/24—Slow-wave structures, e.g. delay systems
    • H01J23/26—Helical slow-wave structures; Adjustment therefor

Definitions

  • the present invention relates to a particular construction method which makes it possible to manufacture very wide band traveling wave tubes having a very low dispersion; this construction method consists in supporting the helix of the delay line of a broadband traveling wave tube by means of dielectric supports ensuring the isolation arranged between the helix and fins or other metallic supports projecting towards the center from a metallic envelope which surrounds the whole.
  • the invention also relates to a traveling wave tube manufactured according to this method of construction.
  • TOP Progressive wave tubes
  • TOP Progressive wave tubes
  • the wide bandwidth allowed by the helix construction of the delay line results from the low dispersion of the electromagnetic waves which propagate along the helix delay line as a function of frequency; in other words, the speed v of the wave which propagates along the helical line depends very little on the frequency of the wave in a wide range of frequencies centered on the nominal operating frequency of the tube traveling waves.
  • the coupling between the high frequency (HF) signal applied to the input of the tube and, from there, to the helical delay line and the electron beam depends on the synchronism of the propagation of the two along the longitudinal direction traveling wave tubes.
  • the speed of the electron beam depends on the acceleration voltages created inside the tube, as a first approximation, and it is modified by the energy exchange which occurs with the electromagnetic field, in second approximation; if, as a first approximation, the speed of the high frequency wave which propagates along the propeller depends only on the geometry of the propeller, in second approximation, it also depends slightly on the frequency, which finally limits the bandwidth of the traveling wave tube.
  • the use of traveling wave tubes in amplifier equipment does not allow the adjustment of operating voltages to modify the speed of the beam electrons when the frequency of the signal to be amplified varies, and it is therefore desirable to '' have as little variation as possible in the speed of the electromagnetic wave as a function of frequency.
  • Figure 1 shows a typical curve which represents the variation of the c / v ratio as a function of the wavelength, where c is the speed of light.
  • a value of d approximately equal to unity means that the phase velocity along the delay line is practically constant when the frequency varies, which is the condition which must be fulfilled for broadband operation, if possible in full operating bandwidth.
  • a very large value of d corresponds either to an infinite value of Vp (wave guided at the cutoff frequency), or to a value of Vg close to zero, which means that the energy does not propagate along the line at delay.
  • the circuit stops transmitting energy in a propagation mode given at frequencies such that the half wavelength in this mode is equal to the period of the geometric characteristics of the delay line. These frequencies are called “cutoff frequencies in mode ⁇ ". There are also cutoff frequencies in zero mode when the phase difference over a period of the slow wave structure is equal to zero or a multiple of 2 ⁇ .
  • cut-off frequencies can be displaced, but at the cost of a reduction in the efficiency of the traveling wave tube in operation: the intensity of the electric field is reduced for a given level of power. propagating in the delay line at a given phase velocity, which reduces interaction with the electron beam in the tube.
  • the cut-off frequencies observed experimentally can be called "natural cut-off frequencies”.
  • a method known in the prior art for reducing this drawback consists in adding an anisotropic charge to the basic helix delay line, which gives a very low dispersion which can even become zero or negative.
  • FIG. 3 The best known of these methods of applying a load, illustrated in FIG. 3, consists of having metal fins in the shape of a U, with a capacitive effect, between the dielectric bars supporting the propeller, the ends of which are positioned very near the propeller (a few tenths of a millimeter). It is difficult to obtain economically reproducible results in an industrial manufacturing process when employing this process. This process generally requires resorting to a difficult technique of soldering.
  • Another method known in the prior art consists in disposing the capacitive charges between the dielectric bars supporting the helix, as shown in FIG. 2, but this solution reduces the coupling impedance of the circuit and the efficiency of the tube.
  • Another known method consists in replacing the fins shaped like the U mentioned above and represented in FIG. 3, by localized metallizations of the dielectric bars supporting the propeller, as shown in FIG. 4. This method is also difficult to be implemented industrially if one wants to obtain economically reproducible results.
  • the invention therefore aims to obtain a higher cut-off frequency without the drawbacks of the methods of the prior art.
  • the fundamental physical principles known in the prior art can be explained in a new construction method according to the invention, which gives a very low dispersion and, consequently, an enlarged useful bandwidth while lowering the industrial cost price and the complexity of the assembly and improving the reproducibility of the characteristics of the tube.
  • the first object of the invention is therefore a method of constructing traveling wave tubes with a propeller, this method of construction being characterized in that the propeller is supported by dielectric supports, these dielectric supports being in turn supported by elements forming supports projecting from the interior surface of the vacuum-tight envelope surrounding the assembly, towards the helix arranged in the center of this envelope, these support elements having a finite electrical path length in the immediate vicinity of said dielectric supports such that the capacitive charge of these dielectric supports is partially compensated by the presence of said elements forming supports at frequencies close to the natural cutoff frequency as defined above.
  • the invention further relates to a traveling wave tube with a propeller incorporating this method of construction.
  • said support elements are made of metallic material.
  • the dielectric supports have the form of continuous bars which are in turn supported by metal supports.
  • the dimensions of the dielectric supports are thus smaller than those of the previous embodiment, which leads to an improvement in the thermal conductivity of the propeller to the envelope which surrounds the assembly.
  • the dielectric supports have the form of discontinuous pads which are arranged between each turn of the propeller and a continuous metal support.
  • These studs can be assembled on the metal support before introducing this sub-assembly into the envelope which surrounds the assembly, which improves the precision of the assembly and facilitates the manufacture of the tube.
  • the reduced dimensions of the studs have the advantage of allowing the use of expensive materials such as diamond and boron nitride with a cubic network with centered faces, for example.
  • the continuous metal support is in the form of a vacuum-tight enveloping structure which, when it is placed inside the jacket surrounding the assembly, leaves a space between this outer jacket and said support structure, space in which a liquid or a cooling gas can be circulated.
  • FIGS. 2, 3 and 4 included for explanatory purposes represent known embodiments of the prior art in which the propeller is supported in its vacuum-tight envelope 2 surrounding the assembly by means of dielectric bars 3, and metal elements 4 are arranged in the space between the propeller and the envelope and between the dielectric supports in a symmetrical manner.
  • FIG. 5 represents an example of a mode of construction of a traveling wave tube with a propeller according to the invention in which the propeller 1 is supported in its vacuum-tight envelope 2 surrounding the assembly by dielectric supports 3 ensuring the insulation which are in turn supported by metal elements 4 which project from the inner wall of the vacuum-tight envelope 2 surrounding the assembly, towards the helix and on which the dielectric supports are arranged.
  • a groove is formed along the length of the dielectric support 3 so as to receive the edge of the metal element 4, which ensures the precision of the assembly and greatly simplifies the manufacturing process compared to the prior art.
  • FIG. 6 represents another example of a method of constructing a propeller traveling wave tube according to the invention in which the propeller 1 is supported in its vacuum-tight envelope 2 surrounding the assembly, by dielectric supports 3 ensuring the isolation, characterized in that the dielectric supports 3 are in turn supported by metallic elements 4 which are projecting relative to the interior wall of the vacuum-tight envelope 2 surrounding the assembly, towards the helix and on which the dielectric supports 3 are arranged.
  • a groove is formed along the length of the metal element 4 so as to receive the edge of the T-shaped electric bar forming a support 3, which ensures assembly precision and greatly simplifies the manufacturing process compared to the prior art.
  • the metal elements of Figures 5 and 6 may advantageously have the shape of a wedge whose thick end rests on the inner face of the vacuum-tight envelope 2 surrounding the assembly.
  • FIG. 7 represents another example of a method of constructing a traveling wave tube with a propeller according to the invention in which the propeller is supported in its vacuum-tight envelope 2 surrounding the assembly by dielectric supports 3 ensuring insulation, characterized in that the dielectric supports 3 are in turn supported by metal elements 4 which project from the inner wall of the vacuum-tight envelope 2 surrounding the assembly, towards the helix and on which the dielectric supports 3 are arranged.
  • the dielectric supports 3 are no longer continuous bars as in the two previous embodiments of the invention shown in FIGS.
  • a groove is formed in the dielectric material to receive the edge of the metal element 4, which ensures the accuracy of the assembly.
  • a groove can be formed along the length of the metal element as in Figure 6 or local holes can be distributed along the length of the metal element to receive dielectric pads having a suitable protruding part to position and hold the studs in the groove or in the holes.
  • FIG. 8 represents another example of a method of constructing a propeller traveling wave tube according to the invention in which the propeller 1 is supported in its vacuum-tight envelope 2 surrounding the assembly for dielectric supports ensuring the insulation 3, characterized in that the dielectric supports 3 are in turn supported by a metal element 4 which protrudes relative to the inner wall of the vacuum-tight envelope 2 surrounding the assembly, towards the helix and on which the dielectric supports 3 are arranged.
  • a groove is formed along the length of the dielectric supports 3 so as to receive the ribs forming supports of the metal element 4, which ensures the precision of the 'assembly and greatly simplifies the manufacturing process compared to the prior art.
  • the metallic elements 4 form a vacuum-tight envelope surrounding the propeller 1 and disposed inside the cylindrical outer envelope 2, defining and delimiting spaces 5 formed between the two envelopes, in which a gas or a liquid can be circulated to cool the delay line.
  • metal elements 4 are used to support the dielectric elements 3 forming propeller supports ensuring isolation, but the invention also relates to a construction method applicable to the manufacture of propeller delay lines in which the metallic elements 4 are replaced by any other material having a finite electrical length, positioned in the immediate vicinity of the dielectric supports 3 so as to partially compensate for the capacitive charge effect of the dielectric at the frequencies close to the natural cutoff frequency. Likewise, the invention also relates to embodiments in which additional metallic elements can be arranged between the elements 4 which support the dielectric supports 3 of the helix 1.

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  • Microwave Tubes (AREA)
EP90401213A 1989-05-30 1990-05-07 Verfahren zur Herstellung einer wendelförmigen Verzögerungsleitung Expired - Lifetime EP0401065B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907081A FR2647953B1 (fr) 1989-05-30 1989-05-30 Mode de construction d'une ligne a retard a helice et tubes a ondes progressives utilisant ce mode de construction
FR8907081 1989-05-30

Publications (2)

Publication Number Publication Date
EP0401065A1 true EP0401065A1 (de) 1990-12-05
EP0401065B1 EP0401065B1 (de) 1995-07-05

Family

ID=9382153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401213A Expired - Lifetime EP0401065B1 (de) 1989-05-30 1990-05-07 Verfahren zur Herstellung einer wendelförmigen Verzögerungsleitung

Country Status (5)

Country Link
US (1) US5132592A (de)
EP (1) EP0401065B1 (de)
JP (1) JPH0320933A (de)
DE (1) DE69020644T2 (de)
FR (1) FR2647953B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0462863A1 (de) * 1990-06-19 1991-12-27 Thomson Tubes Electroniques Wanderfeldröhre mit einer Kopplungsvorrichtung zwischen ihrer Verzögerungsleitung und einer aussen gelegenen Mikrowellenschaltung
EP0507195A2 (de) * 1991-04-01 1992-10-07 Nec Corporation Wendeltyp-Wanderfeldröhren-Struktur mit Bornitrid oder künstlichem Diamant bedeckten Haltegestängen
FR2787918A1 (fr) * 1998-12-23 2000-06-30 Thomson Tubes Electroniques Tube a ondes progressives multibande de longueur reduite capable de fonctionner a puissance elevee

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5341066A (en) * 1992-09-02 1994-08-23 Itt Corporation Anisotropically loaded helix assembly for a traveling-wave tube
FR2758888B1 (fr) * 1997-01-27 1999-04-23 Thomson Csf Procede de modelisation fine du fouillis de sol recu par un radar
FR2833749B1 (fr) * 2001-12-14 2004-04-02 Thales Sa Refroidissement d'un tube electronique
JP2006134751A (ja) * 2004-11-08 2006-05-25 Nec Microwave Inc 電子管
JP2006210261A (ja) * 2005-01-31 2006-08-10 Mitsubishi Electric Corp 遅波回路

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397339A (en) * 1965-04-30 1968-08-13 Varian Associates Band edge oscillation suppression techniques for high frequency electron discharge devices incorporating slow wave circuits
EP0004492A2 (de) * 1978-03-24 1979-10-03 Thomson-Csf Mikrowellenröhre mit einer durch Fluidumströmung gekühlten Verzögerungsleitung
US4264842A (en) * 1977-10-28 1981-04-28 Elettronica S.P.A. Helix type traveling-wave tubes with auxiliary selective shielding provided by conductive elements applied upon dielectric supports
US4689276A (en) * 1983-03-15 1987-08-25 Varian Associates Diamond bonded electronic circuit
EP0347624A1 (de) * 1988-06-21 1989-12-27 Thomson Tubes Electroniques Herstellungsverfahren für eine Verzögerungsleitung für eine Wanderfeldröhre

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2806170A (en) * 1953-09-30 1957-09-10 Rca Corp Traveling wave tube
US2889487A (en) * 1954-09-15 1959-06-02 Hughes Aircraft Co Traveling-wave tube
US3209198A (en) * 1961-06-28 1965-09-28 Sylvania Electric Prod Resilient helix mount for traveling wave tube
US3271615A (en) * 1961-08-23 1966-09-06 Westinghouse Electric Corp Traveling wave electron discharge device having means exerting a radial force upon the envelope
US3421040A (en) * 1966-11-03 1969-01-07 Varian Associates Circuit support for microwave tubes employing shaped dielectric supports rods to capture a ductile material at the support joints
US3691630A (en) * 1969-12-10 1972-09-19 James E Burgess Method for supporting a slow wave circuit via an array of dielectric posts
US3972005A (en) * 1969-12-16 1976-07-27 Varian Associates Ultrawide band traveling wave tube amplifier employing axially conductive circuit loading members
US3670196A (en) * 1971-02-24 1972-06-13 Raytheon Co Helix delay line for traveling wave devices
US4278914A (en) * 1979-10-18 1981-07-14 The United States Of America As Represented By The Secretary Of The Navy Diamond supported helix assembly and method
JPS5875738A (ja) * 1981-10-30 1983-05-07 Nippon Telegr & Teleph Corp <Ntt> ヘリツクス形進行波管

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397339A (en) * 1965-04-30 1968-08-13 Varian Associates Band edge oscillation suppression techniques for high frequency electron discharge devices incorporating slow wave circuits
US4264842A (en) * 1977-10-28 1981-04-28 Elettronica S.P.A. Helix type traveling-wave tubes with auxiliary selective shielding provided by conductive elements applied upon dielectric supports
EP0004492A2 (de) * 1978-03-24 1979-10-03 Thomson-Csf Mikrowellenröhre mit einer durch Fluidumströmung gekühlten Verzögerungsleitung
US4689276A (en) * 1983-03-15 1987-08-25 Varian Associates Diamond bonded electronic circuit
EP0347624A1 (de) * 1988-06-21 1989-12-27 Thomson Tubes Electroniques Herstellungsverfahren für eine Verzögerungsleitung für eine Wanderfeldröhre

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0462863A1 (de) * 1990-06-19 1991-12-27 Thomson Tubes Electroniques Wanderfeldröhre mit einer Kopplungsvorrichtung zwischen ihrer Verzögerungsleitung und einer aussen gelegenen Mikrowellenschaltung
EP0507195A2 (de) * 1991-04-01 1992-10-07 Nec Corporation Wendeltyp-Wanderfeldröhren-Struktur mit Bornitrid oder künstlichem Diamant bedeckten Haltegestängen
EP0507195A3 (en) * 1991-04-01 1993-01-20 Nec Corporation Helix type travelling wave tube structure with supporting rods covered with boron nitride or artificial diamond
FR2787918A1 (fr) * 1998-12-23 2000-06-30 Thomson Tubes Electroniques Tube a ondes progressives multibande de longueur reduite capable de fonctionner a puissance elevee
WO2000039832A2 (fr) * 1998-12-23 2000-07-06 Thomson Tubes Electroniques Tube a ondes progressives multibande de longueur reduite capable de fonctionner a puissance elevee
WO2000039832A3 (fr) * 1998-12-23 2000-10-26 Thomson Tubes Electroniques Tube a ondes progressives multibande de longueur reduite capable de fonctionner a puissance elevee
US6483243B1 (en) 1998-12-23 2002-11-19 Thomson Tubes Electroniques Multiband travelling wave tube of reduced length capable of high power functioning

Also Published As

Publication number Publication date
FR2647953B1 (fr) 1991-08-16
FR2647953A1 (fr) 1990-12-07
DE69020644D1 (de) 1995-08-10
US5132592A (en) 1992-07-21
EP0401065B1 (de) 1995-07-05
JPH0320933A (ja) 1991-01-29
DE69020644T2 (de) 1995-11-30

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