US3003078A - Travelling-wave tube - Google Patents

Travelling-wave tube Download PDF

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Publication number
US3003078A
US3003078A US795024A US79502459A US3003078A US 3003078 A US3003078 A US 3003078A US 795024 A US795024 A US 795024A US 79502459 A US79502459 A US 79502459A US 3003078 A US3003078 A US 3003078A
Authority
US
United States
Prior art keywords
travelling
wave tube
tube
diameter
electron gun
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 - Lifetime
Application number
US795024A
Other languages
English (en)
Inventor
Groendijk Hendrik
Versnel Arie
Wit Cornelis Teunis De
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3003078A publication Critical patent/US3003078A/en
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
    • H01J23/36—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

Definitions

  • the invention relates to a device comprising a travellingwave tube, of which the outer wall has a larger diameter at the area of the electron gun than at the area of the delay line, the input coupling being formed by a system of coaxial conductors, which system is coaxial to the tube.
  • the invention furthermore relates to a travelling-wave tube intended for use in such a device.
  • the aforesaid devices give rise to the difiiculty that the diameters of the coaxial conductors, constituting the input coupling, must be very large, since the inner conductor must embrace the wall at the area of the electron gun. Since for the conventional impedances of coaxial conductors the ratio between the diameters of the two condoctors must have a definite value, the outer diameter is so large that the application of a magnetic focusing system brings about great difficulties.
  • the invention has for its object to provide a structure in which the diameters of the coaxial conductor system are at a minimum.
  • a device comprising a travelling-wave tube, of which the outer wall has a larger diameter at the area of the electron gun is provided with a metal layer from the cathode end to the other end of the gun, this layer being capacitatively coupled with the inner conductor of the coaxial system, the outer conductor having, at a certain distance from the gun, a gradually smaller diameter to assume approximately the outer diameter of the tube.
  • the structure according to the invention ensures in the first place that the inner conductor of the coaxial system need not embrace the electron gun, while at the area of the gun the ratio between the diameters of the metal layer and the outer conductor may be smaller than that between the outer conductor and the inner conductor, owing to the presence of the glass of the wall, which has a higher dielectric constant than air.
  • the diameter of the outer conductor is materially smaller than would be the case, when the inner conductor embraces the tube at the area of the electron gun.
  • reference numeral 1 designates the glass wall of the travelling-wave tube, which has a comparatively small diameter at the area of the delay line 2.
  • the portion 4 of the wall has a materially larger diameter.
  • the cathode end 5 of the tube has a smaller diameter.
  • the inner side of the glass wall is provided with a metal layer 8, which is coupled capacitatively at the narrow part with an inner conductor 9 of a system of coaxial conductors, of which 10 designates the outer conductor. After a detachable interruption 11 the outer conductor is prolonged in the portion 12, which merges gradually at 13 into a part of smaller diameter 14.
  • a travelling-wave tube comprising an envelope, an electron gun structure within said envelope, said gun including a cathode, a delay line within said envelope and spaced from said electron gun, said envelope having a portion of given diameter surrounding the cathode and another portion having a diameter less than said given diameter surrounding the delay line, and an input coupling to said travelling-wave tube comprising a system of coaxial conductors, the inner conductor of said system comprising a first portion surrounding a portion of the envelope enclosing the cathode and a second portion comprising a metal layer on the inner wall of a portion of the envelope surrounding the electron gun, said first and second portions of said inner conductor being capacitatively coupled to one another, the diameter of said outer conductor decreasing gradually between the electron gun and the delay line until it has approximately the outer diameter of the envelope whereby at the area of the electron gun the ratio between the diameters of the metal layer and the outer conductor is smaller than the ratio between the diameters of the outer conductor and inner conductor.

Landscapes

  • Microwave Tubes (AREA)
  • Waveguides (AREA)
  • Glass Compositions (AREA)
  • Particle Accelerators (AREA)
US795024A 1958-04-10 1959-02-24 Travelling-wave tube Expired - Lifetime US3003078A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL226721 1958-04-10

Publications (1)

Publication Number Publication Date
US3003078A true US3003078A (en) 1961-10-03

Family

ID=19751174

Family Applications (1)

Application Number Title Priority Date Filing Date
US795024A Expired - Lifetime US3003078A (en) 1958-04-10 1959-02-24 Travelling-wave tube

Country Status (6)

Country Link
US (1) US3003078A (enrdf_load_stackoverflow)
CH (1) CH373821A (enrdf_load_stackoverflow)
DE (1) DE1087711B (enrdf_load_stackoverflow)
FR (1) FR1245576A (enrdf_load_stackoverflow)
GB (1) GB846255A (enrdf_load_stackoverflow)
NL (2) NL226721A (enrdf_load_stackoverflow)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557961A (en) * 1947-10-21 1951-06-26 Int Standard Electric Corp Transmission system for highfrequency currents
US2615141A (en) * 1947-11-20 1952-10-21 Rca Corp High-frequency electron discharge tube of the traveling wave type
US2643297A (en) * 1948-12-03 1953-06-23 Fed Telecomm Lab Inc Gas discharge transmission arrangement
US2765421A (en) * 1952-02-08 1956-10-02 Bell Telephone Labor Inc Electron discharge devices
US2808533A (en) * 1952-02-08 1957-10-01 Bell Telephone Labor Inc Electron discharge devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557961A (en) * 1947-10-21 1951-06-26 Int Standard Electric Corp Transmission system for highfrequency currents
US2615141A (en) * 1947-11-20 1952-10-21 Rca Corp High-frequency electron discharge tube of the traveling wave type
US2643297A (en) * 1948-12-03 1953-06-23 Fed Telecomm Lab Inc Gas discharge transmission arrangement
US2765421A (en) * 1952-02-08 1956-10-02 Bell Telephone Labor Inc Electron discharge devices
US2808533A (en) * 1952-02-08 1957-10-01 Bell Telephone Labor Inc Electron discharge devices

Also Published As

Publication number Publication date
DE1087711B (de) 1960-08-25
GB846255A (en) 1960-08-31
NL226721A (enrdf_load_stackoverflow)
NL98135C (enrdf_load_stackoverflow)
CH373821A (de) 1963-12-15
FR1245576A (fr) 1960-11-10

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