US2724090A - Electron discharge device output coupler - Google Patents

Electron discharge device output coupler Download PDF

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Publication number
US2724090A
US2724090A US224099A US22409951A US2724090A US 2724090 A US2724090 A US 2724090A US 224099 A US224099 A US 224099A US 22409951 A US22409951 A US 22409951A US 2724090 A US2724090 A US 2724090A
Authority
US
United States
Prior art keywords
coaxial line
wave guide
magnetron
line section
vanes
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
US224099A
Other languages
English (en)
Inventor
Norman H Moore
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.)
Litton Industries Inc
Original Assignee
Litton Industries Inc
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
Priority to BE523525D priority Critical patent/BE523525A/xx
Application filed by Litton Industries Inc filed Critical Litton Industries Inc
Priority to US224099A priority patent/US2724090A/en
Priority to DEI7154A priority patent/DE965140C/de
Application granted granted Critical
Publication of US2724090A publication Critical patent/US2724090A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices

Definitions

  • the magnetron 1 comprises a body portion Z to which are connected a plurality of magnetron vanes 3 which serve to provide cavity resonators.
  • a cathode 4 provides the electron sourcefor operation of the magnetron.
  • the magnetic pole pieces and the tuning elements of a tunable magnetron are not illustrated since they are ⁇ not Vnecessary to an understanding of the present invention.
  • a wave guide section 5 is provided with its outer wall 6 sealed at one end to ⁇ body portion 2.
  • the other end of the wall 6 is closed by a metal cap 7. Intermediate the ends ⁇ of the wave guide 5 and preferably near the closed end is ⁇ provided a ⁇ tapered coaxial line section 8.
  • the outer conductor wall 9 of coaxial line section 8 is ⁇ sealed through wall 6, the inner conductor 10 also extending into theL waveguide ⁇ S substantially half way therethrough.
  • a sealing ring 1 1 Fastened to wall 9 ⁇ by brazing or welding, for example, is a sealing ring 1 1 which may be of a metal having similarcoecient of expansion to that of glass.
  • a second ⁇ ⁇ ring -12 is provided of the same metal as ring 11, and to :this ring is fastened a glass seal 13.
  • cup 14 made of similar type metal to that of rings 11 and 12.
  • Cup ⁇ 14 is made Ito have an outer diameter substantially the same as the diameter of the inner conductor of a coaxial ⁇ line ⁇ to be discharge devices, constituting a wave guide and a1 coaxial line section which will meet the requirements outlined above.
  • a wave guide section having a pair of impedance transformer vanes extending within the wave guide section from a coupling opening in the resonator to a coaxial line section, the inner and outer conductors of the coaxial line section being connected respectively to ditferent ones of the impedance transformer vanes.
  • the wave guide extension beyond the junction of the coaxial line section and the vanes may be a wave guide beyond cut-off and closed to provide a resonator reflecting a high impedance at the junction.
  • a glass seal may be provided between the inner and outer conductors of the coaxial line section externally of the wave guide.
  • the Wave guide section and the coaxial line section are at right angles to one another so as to provide maximum protection against ion bombardment of the glass seal.
  • Fig. l is a sectional view of a portion of a magnetron and an output coupler illustrating my invention
  • Fig. 2 is a sectional view alongthe line 2-2 of Fig. 1, and
  • Fig. 3 is a curve illustrating the broad band operating characteristics of a magnetron incorporating my invention.
  • ⁇ Rings 11 and 12 are sealed to- ⁇ gether by brazing orwelding to complete the seal of the magnetron envelope.
  • the lower end of cup 14 is fastened as by ⁇ brazing or welding ⁇ to the tapered inner conductor 10 of ythe coaxial line section 8.
  • a threaded connector ring 15 may ⁇ be secured to the outer surface of ring 11 to provide the desired coupling for the outer conductor of the coaxial line to serve as an energy lead from the magnetron.
  • These ⁇ elements 16, 17 may extend through openings in the body portion 2, their inner ends being curved to conform with the curvature of the cylindrical Wall of the magnetron body.
  • the vane 16, 17 are spaced apart a predetermined dstance as at 18 to provide a coupling opening from one of the cavity resonators into the Wave guide.
  • the separation between vanes 16, 17 gradually diverges to the point at which coaxial line section 3 enters the wave guide to provide an impedance matching ramp for matching the impedance of the resonator with that of the coaxial line section 8.
  • the outer conductor 9 of coaxial section 8 is fastened to vane 16 while the inner conductor 10 is fastened to vane 17 by threaded connection for example.
  • the portion of wave guide section 5 beyond the ends of vanes 16, 17 forms a resonator provided in the wave guide proportioned to be beyond cut-olf and so reects at the juncture of coaxial line section 8 and vanes 16, 17, a high impedance.
  • the output coaxial line, not shown, and coaxial line section 8 have an impedance of approximately 5() ohms.
  • the wave guide section 5 itself may have an impedance of 25 ohms: for example and the resonator impedance may be relatively small, in the order of 8-1() ohms. Separation between vanes 16 and 17 is adjusted to provide the necessary impedance match between the resonator cavity and the coaxial line section.
  • ramp vane 17 may be provided with a xed portion 19 to which is pivoted a movable portion 20 by means of pin 21.
  • Fig. 2 is plotted a curve 25 showing the standing wave ratio existing at an output line with respect to ,the wave length in centimeters produced by the magnetron oscillator. It will bel noted that the standing wave ratio is less than 1.3 over an operating wave length ran'geof substantially ll-23 centimeters, which repre.
  • a magnetron comprising a cylindrical magnetron body, and a plurality of vanes each fastened at one end to said body to provide resonators, said body being provided with an output opening
  • an output coupler comprising a wave guide having a wall sealed at one end to said body about said output opening, a conductive closure memberY sealed at the other end of said wave guide, a tapered coaxial line section extending through said wave guide wall at substantially right angles thereto, intermediate said body and said closure member, an insulating seal between the outer and inner conductors of said coaxial line section externally of said wave guide, a pair of impedance transformer vanes mounted within said wave guide and extending into and substantially filling the output opening inv said body, and from said body to said coaxial line section, said transformer vanes being spacedv apart a small distance at their ends adjacent said body to provide a coupling opening between a resonator of said magnetron and said wave guide, said spacing between said transformer vanes gradually increasing from the ends adjacent said body to
  • a coupler according to claim l wherein the portion of said wave guide between said coaxial line section and said closure member comprises a wave guide beyond cut-oft' at the output frequency of said magnetron, whereby a high impedance is reflected at the junction of said coaxial line section and said transformer vanes.

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  • Microwave Tubes (AREA)
US224099A 1951-05-02 1951-05-02 Electron discharge device output coupler Expired - Lifetime US2724090A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE523525D BE523525A (US06262066-20010717-C00638.png) 1951-05-02
US224099A US2724090A (en) 1951-05-02 1951-05-02 Electron discharge device output coupler
DEI7154A DE965140C (de) 1951-05-02 1953-04-22 Kopplungseinrichtung zwischen einem Hohlraumresonator eines elektrischen Entladungsgefaesses und einer Koaxialleitung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US224099A US2724090A (en) 1951-05-02 1951-05-02 Electron discharge device output coupler

Publications (1)

Publication Number Publication Date
US2724090A true US2724090A (en) 1955-11-15

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Family Applications (1)

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US224099A Expired - Lifetime US2724090A (en) 1951-05-02 1951-05-02 Electron discharge device output coupler

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US (1) US2724090A (US06262066-20010717-C00638.png)
BE (1) BE523525A (US06262066-20010717-C00638.png)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774912A (en) * 1955-09-27 1956-12-18 Kline Jack H-guide type coupling for coaxial output
US2886786A (en) * 1957-08-01 1959-05-12 Gen Electric Balun-ridge circuit
US2910620A (en) * 1957-10-15 1959-10-27 Jenny Hans Karl Magnetron tuning cavity and waveguide coupler
US2922961A (en) * 1941-07-25 1960-01-26 Bell Telephone Labor Inc Finline coupler
US3065377A (en) * 1959-12-12 1962-11-20 Kenneth G Eakin Microwave generator

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1841473A (en) * 1930-01-30 1932-01-19 American Telephone & Telegraph Arrangement for connecting or terminating coaxial conductors
US2404086A (en) * 1942-10-07 1946-07-16 Westinghouse Electric Corp Coupling device
US2477633A (en) * 1945-11-01 1949-08-02 Charles V Litton Protective means for electron discharge devices
US2481151A (en) * 1944-04-13 1949-09-06 Raytheon Mfg Co Electron discharge device
US2555349A (en) * 1948-08-18 1951-06-05 Charles V Litton Variable ramp for magnetrons
US2609522A (en) * 1950-04-03 1952-09-02 Joseph F Hull Magnetron
US2623198A (en) * 1946-05-13 1952-12-23 Bell Telephone Labor Inc Tunable magnetron

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1841473A (en) * 1930-01-30 1932-01-19 American Telephone & Telegraph Arrangement for connecting or terminating coaxial conductors
US2404086A (en) * 1942-10-07 1946-07-16 Westinghouse Electric Corp Coupling device
US2481151A (en) * 1944-04-13 1949-09-06 Raytheon Mfg Co Electron discharge device
US2477633A (en) * 1945-11-01 1949-08-02 Charles V Litton Protective means for electron discharge devices
US2623198A (en) * 1946-05-13 1952-12-23 Bell Telephone Labor Inc Tunable magnetron
US2555349A (en) * 1948-08-18 1951-06-05 Charles V Litton Variable ramp for magnetrons
US2609522A (en) * 1950-04-03 1952-09-02 Joseph F Hull Magnetron

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2922961A (en) * 1941-07-25 1960-01-26 Bell Telephone Labor Inc Finline coupler
US2774912A (en) * 1955-09-27 1956-12-18 Kline Jack H-guide type coupling for coaxial output
US2886786A (en) * 1957-08-01 1959-05-12 Gen Electric Balun-ridge circuit
US2910620A (en) * 1957-10-15 1959-10-27 Jenny Hans Karl Magnetron tuning cavity and waveguide coupler
US3065377A (en) * 1959-12-12 1962-11-20 Kenneth G Eakin Microwave generator

Also Published As

Publication number Publication date
BE523525A (US06262066-20010717-C00638.png)

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