EP0102288B1 - Wanderfeldröhre mit Mitteln zur Dämpfung parasitärer Schwingungen - Google Patents

Wanderfeldröhre mit Mitteln zur Dämpfung parasitärer Schwingungen Download PDF

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Publication number
EP0102288B1
EP0102288B1 EP83401630A EP83401630A EP0102288B1 EP 0102288 B1 EP0102288 B1 EP 0102288B1 EP 83401630 A EP83401630 A EP 83401630A EP 83401630 A EP83401630 A EP 83401630A EP 0102288 B1 EP0102288 B1 EP 0102288B1
Authority
EP
European Patent Office
Prior art keywords
auxiliary
helix
delay line
supports
tube according
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.)
Expired
Application number
EP83401630A
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English (en)
French (fr)
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EP0102288A1 (de
Inventor
Robert Duret
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 SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0102288A1 publication Critical patent/EP0102288A1/de
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    • 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
    • H01J23/30—Damping arrangements associated with slow-wave structures, e.g. for suppression of unwanted oscillations

Definitions

  • the present invention relates to a traveling wave tube comprising means for suppressing parasitic oscillations.
  • the invention relates to the field of traveling wave tubes operating as an amplifier and having a delay line of the helix type, that is to say for example, a delay line of single helix, of double helix.
  • the present invention relates to a traveling wave tube comprising means for suppressing parasitic oscillations and this tube comprises a delay line of the helical type placed in a metal sheath to which it is fixed by dielectric supports.
  • the means for suppressing parasitic oscillations are constituted by at least one helical type auxiliary delay line, placed inside the sheath in one of the intervals between two adjacent dielectric supports, and periodically fixed to the sheath by metal supports. .
  • the structure according to the invention allows the suppression of parasitic oscillations without the insulating properties of the dielectric supports being reduced, as is the case if the suppression means are fixed to the dielectric supports.
  • a reduction in the insulating properties of the dielectric supports limits the possibilities of going up in peak power by risk of breakdown of the dielectric.
  • a helical delay line 1 belonging to a traveling wave tube.
  • the electron gun and the traveling wave tube collector which are well known in the prior art, are not shown in the figure.
  • This delay line is fixed in a sheath or sleeve 2, metallic and cylindrical, by three dielectric supports 3.
  • the propeller and the supports are assembled by clamping in the sleeve.
  • the propeller is made of tungsten, for example, and the supports are quartz, alumina, glucine or boron nitride.
  • the sleeve can be made of copper.
  • the propeller 1 is brazed to the dielectric supports 3 which are brazed to the sleeve 2.
  • the propeller can then be made of copper, as can the sleeve, and the dielectric supports can be made of beryllium oxide, for example.
  • the metal sleeve 2 is connected to ground, therefore to the reference potential of the tube.
  • auxiliary delay lines 4 in a helix, are placed, inside the sheath, in each interval between two adjacent dielectric supports 3.
  • These delay lines auxiliaries are periodically fixed to the sheath 2 by metal supports 5. They are coupled to the main propeller 1, but have no material contact with it.
  • the auxiliary delay lines can be copper, molybdenum or tungsten, for example, and the metal supports can be platinum.
  • auxiliary delay lines with periodic grounding, constitute means for suppressing parasitic oscillations because they produce an attenuation which varies with frequency; this attenuation is very important for the frequencies close to the cut-off frequency, for which parasitic oscillations can occur and this attenuation is much weaker for the other operating frequencies.
  • auxiliary propellers i.e. the diameter of the wire which constitutes them, their pitch, their diameter ..., as well as the dimensions of the metal supports are calculated to greatly attenuate the frequency zone in which can be produce parasitic oscillations. This frequency zone can be known with precision.
  • the auxiliary propellers therefore constitute resonant circuits.
  • the length of the auxiliary propellers which is between two adjacent metallic supports is substantially equal to half the wavelength of the center frequency of the frequency zone to be attenuated. However, this length is modified in particular so that there is an integer number of turns between two adjacent metal supports.
  • a metal support is provided in contact with each auxiliary propeller every four steps of this propeller.
  • the ends of the auxiliary propellers are constituted by points to ground, that is to say that the auxiliary propellers end in a part in contact with metal supports 5.
  • Variable coupling can be achieved between the auxiliary propellers and the main propeller by varying the thickness of the metal supports 5.
  • the thickness of the metal supports 5 is such that there can be no contact between the main propeller and the auxiliary propellers. There is only a coupling between these propellers, but no material contact.
  • the means for suppressing parasitic oscillations therefore consist of one or more auxiliary delay lines periodically connected to the sheath grounded by metal supports; it should be noted that this structure allows the suppression of parasitic oscillations without the insulating properties of the dielectric supports being diminished, as would be the case if the suppression means were fixed to the dielectric supports. A reduction in the insulating properties of the dielectric supports limits the possibilities of going up in peak power by risk of breakdown of the dielectric.
  • the means for suppressing parasitic oscillations according to the invention are light, compact, simple to make and easily installed. It should be noted in particular that it is not necessary, during assembly, to position the auxiliary propellers very precisely with respect to the main propeller. As the pitch of the auxiliary propellers is much lower than that of the main propeller, there are always between two successive turns of the main propeller several turns of auxiliary propeller.
  • the invention applies to traveling wave tubes having a main delay line in a helix, or derived from the helix.
  • This delay line can for example be a double helix, that is to say made up of two identical helices, coming from the same point and with reverse winding directions.
  • auxiliary delay lines are of the helical type, that is to say single helix, double helix, of the "ring and bar” type, of the "ring and loop” type.
  • delay lines of the helical type are chosen because they have an aerated structure which allows coupling with the main delay line.
  • the invention covers embodiments where an auxiliary delay line is provided in each interval between two adjacent dielectric supports or only in some of these intervals. There can therefore be one, two, three, and even a greater number of auxiliary helices depending on the number of dielectric supports.
  • the invention covers the embodiments where the auxiliary delay lines are present all along the main delay line or only on a part of it, for example towards the exit of this line which is an area strong interaction.

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  • Microwave Tubes (AREA)

Claims (6)

1. Wanderwellenröhre, mit einer Einrichtung zur Unterdrückung von Störschwingungen, wobei diese Röhre eine Verzögerungsleitung (1) vom Typ einer Helix, die in ein Metallfutter (2) eingebracht ist, woran sie durch dielektrische Stützen (3) befestigt ist, dadurch gekennzeichnet, daß die Einrichtung zur Unterdrückung der Störschwingungen durch wenigstens eine Hilfs-Verzögerungsleitung (4) vom Typ einer Helix gebildet ist, wobei diese Helix im Inneren des Futters in einem der Zwischenräume zwischen zwei benachbarten dielektrischen Stützen angeordnet und periodisch an dem Futter durch metallische Halter (5) und ohne Berührung mit der genannten Verzögerungsleitung (1) befestigt ist.
2. Röhre nach Anspruch 1, dadurch gekennzeichnet, daß die Länge der Hilfs-Helix (4), die zwischen zwei benachbarten metallischen Haltern (5) liegt, im wesentlichen gleich der Hälfte der Wellenlänge der Mittenfrequenz des durch die Hilfs-Helix gedämpften Frequenzgebietes zur Unterdrückung der Störschwingungen ist.
3. Röhre nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Verzögerungsleitungen (1, 4) vom Helixtyp ausgewählt sind unter den Verzögerungsleitungen mit Einfachhelix und Doppelhelix.
4. Röhre nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hilfs-Verzögerungsleitungen (4) über die gesamte Länge der Hauptverzögerungsleitung (1) vorhanden sind.
5. Röhre nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Hilfs-Verzögerungsleitungen (4) nur am Ausgang der Hauptverzögerungsleitung (1) vorhanden sind.
6. Röhre nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß in jedem Zwischenraum zwischen zwei dielektrischen benachbarten Stützen (3) eine Hilfs-Verzögerungsleitung (4) vorhanden ist.
EP83401630A 1982-08-20 1983-08-09 Wanderfeldröhre mit Mitteln zur Dämpfung parasitärer Schwingungen Expired EP0102288B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8214433 1982-08-20
FR8214433A FR2532109A1 (fr) 1982-08-20 1982-08-20 Tube a onde progressive comportant des moyens de suppression des oscillations parasites

Publications (2)

Publication Number Publication Date
EP0102288A1 EP0102288A1 (de) 1984-03-07
EP0102288B1 true EP0102288B1 (de) 1987-06-10

Family

ID=9276986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83401630A Expired EP0102288B1 (de) 1982-08-20 1983-08-09 Wanderfeldröhre mit Mitteln zur Dämpfung parasitärer Schwingungen

Country Status (4)

Country Link
US (1) US4559474A (de)
EP (1) EP0102288B1 (de)
DE (1) DE3372039D1 (de)
FR (1) FR2532109A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2629634B1 (fr) * 1984-12-18 1990-10-12 Thomson Csf Tube a onde progressive comportant une ligne a retard du type en helice fixee a un fourreau par l'intermediaire de support dielectriques en nitrure de bore
US4912366A (en) * 1987-12-07 1990-03-27 Raytheon Company Coaxial traveling wave tube amplifier
FR2683091A1 (fr) * 1991-10-25 1993-04-30 Thomson Tubes Electroniques Dispositif de refroidissement ameliore pour tube hyperfrequence.
FR2758888B1 (fr) * 1997-01-27 1999-04-23 Thomson Csf Procede de modelisation fine du fouillis de sol recu par un radar
FR2787918B1 (fr) 1998-12-23 2001-03-16 Thomson Tubes Electroniques Tube a ondes progressives multibande de longueur reduite capable de fonctionner a puissance elevee
US6356022B1 (en) 2000-07-07 2002-03-12 Ampwave Tech, Llc Tapered traveling wave tube
US6356023B1 (en) 2000-07-07 2002-03-12 Ampwave Tech, Llc Traveling wave tube amplifier with reduced sever
US7654407B1 (en) * 2005-11-29 2010-02-02 Obrecht Bruce E Garbage can holder

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2828440A (en) * 1950-06-22 1958-03-25 Rca Corp Traveling wave electron tube
FR1109184A (fr) * 1954-07-16 1956-01-23 Csf Perfectionnements aux lignes à retard en hélice
US2921224A (en) * 1954-12-06 1960-01-12 Bell Telephone Labor Inc Traveling wave tube amplifier
US2971114A (en) * 1959-07-23 1961-02-07 Daniel G Dow Helically-strapped multifilar helices
NL122370C (de) * 1960-02-08
US3142777A (en) * 1963-07-15 1964-07-28 Varian Associates Traveling wave tubes having helix derived slow-wave circuits with tapered support stubs and loading means
FR2075837A1 (de) * 1969-12-16 1971-10-15 Thomson Csf
US3903449A (en) * 1974-06-13 1975-09-02 Varian Associates Anisotropic shell loading of high power helix traveling wave tubes
US4107575A (en) * 1976-10-04 1978-08-15 The United States Of America As Represented By The Secretary Of The Navy Frequency-selective loss technique for oscillation prevention in traveling-wave tubes
US4158791A (en) * 1977-02-10 1979-06-19 Varian Associates, Inc. Helix traveling wave tubes with resonant loss
FR2390633A1 (fr) * 1977-05-09 1978-12-08 Renault Dispositif de synchronisation perfectionne
US4282457A (en) * 1979-06-18 1981-08-04 Raytheon Company Backward wave suppressor
US4296354A (en) * 1979-11-28 1981-10-20 Varian Associates, Inc. Traveling wave tube with frequency variable sever length
US4358704A (en) * 1980-09-02 1982-11-09 Varian Associates, Inc. Helix traveling wave tubes with reduced gain variation

Also Published As

Publication number Publication date
FR2532109B1 (de) 1985-05-24
FR2532109A1 (fr) 1984-02-24
US4559474A (en) 1985-12-17
EP0102288A1 (de) 1984-03-07
DE3372039D1 (en) 1987-07-16

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