EP0402549A1 - Lauffeldröhre mit wendelförmiger Verzögerungsleitung, welche mittels dielektrischer Halterungsstäbe aus Bornitrid an der Vakuumhülle befestigt ist - Google Patents

Lauffeldröhre mit wendelförmiger Verzögerungsleitung, welche mittels dielektrischer Halterungsstäbe aus Bornitrid an der Vakuumhülle befestigt ist Download PDF

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Publication number
EP0402549A1
EP0402549A1 EP89401635A EP89401635A EP0402549A1 EP 0402549 A1 EP0402549 A1 EP 0402549A1 EP 89401635 A EP89401635 A EP 89401635A EP 89401635 A EP89401635 A EP 89401635A EP 0402549 A1 EP0402549 A1 EP 0402549A1
Authority
EP
European Patent Office
Prior art keywords
boron nitride
delay line
supports
wave tube
travelling
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
EP89401635A
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English (en)
French (fr)
Other versions
EP0402549B1 (de
Inventor
Didier Grauleau
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
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
Priority to DE1989616014 priority Critical patent/DE68916014T2/de
Publication of EP0402549A1 publication Critical patent/EP0402549A1/de
Application granted granted Critical
Publication of EP0402549B1 publication Critical patent/EP0402549B1/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 traveling wave tube comprising a helical type delay line fixed to a sheath by means of dielectric supports made of boron nitride.
  • the invention relates to the field of traveling wave or TOP tubes having a helical type delay line, that is to say for example a simple helical delay line, of the "ring and bar” type, of the type “ring and loop” ...
  • the delay line will in the following be assimilated to a simple propeller.
  • the helical delay line is placed in a cylindrical sheath, generally metallic, to which it is fixed by means of dielectric supports.
  • the propeller and the supports are assembled by clamping in the sleeve or sleeve.
  • the propeller is made of tungsten for example and the supports of quarz, alumina, glucine or boron nitride for example.
  • the sleeve can for example be made of copper or stainless steel.
  • the propeller is brazed to the dielectric supports which are brazed to the sleeve.
  • the propeller can then be made of copper, as well as the sleeve, and the dielectric supports can be made of beryllium oxide for example.
  • Three dielectric supports are generally used which are regularly distributed at 12O ° from one another.
  • the present invention proposes to solve the problems which arise when using dielectric supports made of boron nitride.
  • Boron nitride is used because its thermal conductivity is good and its dielectric constant low, of the order of 3 for anisotropic boron nitride; this low dielectric constant means that the energy does not concentrate in the dielectric supports and improves the coupling impedance.
  • the Applicant has first deposited on the dielectric supports a slightly conductive material, such as graphite. This deposition of graphite instead of solving these problems accentuated them.
  • the present invention makes it possible to solve the problems associated with the use of dielectric supports made of boron nitride.
  • the present invention relates to a traveling wave tube comprising a helical type delay line, fixed to a sheath by means of dielectric supports made of boron nitride, and characterized in that the supports carry a layer of insulating material having a secondary emission factor greater than 1, such as for example alumina or glucin.
  • the problems associated with the use of dielectric supports made of boron nitride are resolved when these supports are coated with a layer of insulating material having a secondary emission coefficient greater than 1, because the problems observed are due the fact that boron nitride has a secondary emission factor of less than 1, under the conditions in which it is used.
  • This secondary emission factor less than 1 results in the dielectric supports taking a high negative potential over time.
  • the electron beam is defocused, a large fraction of the cathode current is intercepted. There is therefore observed a propeller current which is not constant and which can become very large.
  • FIG. 1 represents a view in longitudinal section of a traveling wave tube comprising a delay line of the helical type.
  • FIG. 2 is a cross-sectional view which shows three dielectric supports 8, arranged at 120 ° from one another, and which secure the delay line of the helix type 2 to the cylindrical sheath 3.
  • rods can have various sections: rectangular, square .... or as in Figure 2 of substantially trapezoidal shape.
  • the dielectric supports 3 are coated with a layer of insulating material 9 having a second emission coefficient may be greater than 1, such as for example alumina or glucin.

Landscapes

  • Microwave Tubes (AREA)
EP89401635A 1984-12-18 1989-06-13 Lauffeldröhre mit wendelförmiger Verzögerungsleitung, welche mittels dielektrischer Halterungsstäbe aus Bornitrid an der Vakuumhülle befestigt ist Expired - Lifetime EP0402549B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1989616014 DE68916014T2 (de) 1989-06-13 1989-06-13 Lauffeldröhre mit wendelförmiger Verzögerungsleitung, welche mittels dielektrischer Halterungsstäbe aus Bornitrid an der Vakuumhülle befestigt ist.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8419363A FR2629634B1 (fr) 1984-12-18 1984-12-18 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

Publications (2)

Publication Number Publication Date
EP0402549A1 true EP0402549A1 (de) 1990-12-19
EP0402549B1 EP0402549B1 (de) 1994-06-08

Family

ID=9310729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401635A Expired - Lifetime EP0402549B1 (de) 1984-12-18 1989-06-13 Lauffeldröhre mit wendelförmiger Verzögerungsleitung, welche mittels dielektrischer Halterungsstäbe aus Bornitrid an der Vakuumhülle befestigt ist

Country Status (3)

Country Link
US (1) US5071055A (de)
EP (1) EP0402549B1 (de)
FR (1) FR2629634B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534762A1 (de) * 1991-09-27 1993-03-31 Nec Corporation Dielektrischer Stützstab für eine Wanderfeldröhre

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038076A (en) * 1989-05-04 1991-08-06 Raytheon Company Slow wave delay line structure having support rods coated by a dielectric material to prevent rod charging
JP2946989B2 (ja) * 1993-02-03 1999-09-13 日本電気株式会社 らせん型遅波回路構体およびその製造方法
JPH08111182A (ja) 1994-08-17 1996-04-30 Toshiba Corp 進行波管の遅波回路構体及びその製造方法
FR2758888B1 (fr) * 1997-01-27 1999-04-23 Thomson Csf Procede de modelisation fine du fouillis de sol recu par un radar
JP3520396B2 (ja) * 1997-07-02 2004-04-19 セイコーエプソン株式会社 アクティブマトリクス基板と表示装置
DE69829458T2 (de) * 1997-08-21 2005-09-29 Seiko Epson Corp. Anzeigevorrichtung mit aktiver matrix
JP3580092B2 (ja) * 1997-08-21 2004-10-20 セイコーエプソン株式会社 アクティブマトリクス型表示装置
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
US6221563B1 (en) 1999-08-12 2001-04-24 Eastman Kodak Company Method of making an organic electroluminescent device
US6899507B2 (en) * 2002-02-08 2005-05-31 Asm Japan K.K. Semiconductor processing apparatus comprising chamber partitioned into reaction and transfer sections
US6917162B2 (en) * 2002-02-13 2005-07-12 Genvac Aerospace Corporation Traveling wave tube
CN100339928C (zh) * 2003-07-21 2007-09-26 中国科学院电子学研究所 利用过渡管壳实现螺旋慢波结构的组合挤压法
JP2006134751A (ja) * 2004-11-08 2006-05-25 Nec Microwave Inc 電子管
FR2883409B1 (fr) * 2005-03-18 2007-04-27 Thales Sa Procede de fabrication d'un top avec effet de charge reduit
CN104157537B (zh) * 2014-09-02 2017-04-12 安徽华东光电技术研究所 多组螺旋线并列慢波结构
CN111029229B (zh) * 2019-11-26 2022-06-21 南京三乐集团有限公司 一种行波管用氮化硼夹持杆除气装置及方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406051A1 (de) * 1984-02-20 1985-08-22 Siemens AG, 1000 Berlin und 8000 München Verzoegerungsleitung fuer wanderfeldroehren und verfahren zu ihrer herstellung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7638159U1 (de) * 1976-12-06 1977-06-16 Siemens Ag, 1000 Berlin Und 8000 Muenchen Lauffeldroehre mit einer wendelartigen verzoegerungsleitung
FR2454694A1 (fr) * 1979-04-20 1980-11-14 Thomson Csf Tube a ondes progressives comportant des supports de ligne a retard a geometrie variable
FR2532109A1 (fr) * 1982-08-20 1984-02-24 Thomson Csf Tube a onde progressive comportant des moyens de suppression des oscillations parasites
GB2141370B (en) * 1983-06-17 1987-02-04 Standard Telephones Cables Ltd Bonding metal to ceramic
US5038076A (en) * 1989-05-04 1991-08-06 Raytheon Company Slow wave delay line structure having support rods coated by a dielectric material to prevent rod charging

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406051A1 (de) * 1984-02-20 1985-08-22 Siemens AG, 1000 Berlin und 8000 München Verzoegerungsleitung fuer wanderfeldroehren und verfahren zu ihrer herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Conf. Proc. Microwaves 1986, 24-26 juin 1986, Brighton, GB. Microwave exhibitions and publishers Ltd, GB. pages 360-365. H.J. SLOLEY et al.: "High power, high frequency helix TWT's." *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0534762A1 (de) * 1991-09-27 1993-03-31 Nec Corporation Dielektrischer Stützstab für eine Wanderfeldröhre

Also Published As

Publication number Publication date
FR2629634B1 (fr) 1990-10-12
EP0402549B1 (de) 1994-06-08
US5071055A (en) 1991-12-10
FR2629634A1 (fr) 1989-10-06

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