US2721295A - Magnetron - Google Patents

Magnetron Download PDF

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Publication number
US2721295A
US2721295A US381060A US38106053A US2721295A US 2721295 A US2721295 A US 2721295A US 381060 A US381060 A US 381060A US 38106053 A US38106053 A US 38106053A US 2721295 A US2721295 A US 2721295A
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US
United States
Prior art keywords
magnetron
anodes
anode
conductors
anode segments
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
US381060A
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English (en)
Inventor
Posthumus Klaas
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
    • H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
    • H01J25/58—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode having a number of resonators; having a composite resonator, e.g. a helix

Definitions

  • This invention relates to magnetrons of the type comprising a resonator system constituted by a plurality of interconnected, circularly-grouped anode segments.
  • the chief object of the invention is to provide a magnetron of the foregoing type in which the connections between the anode segments are much simpler and more symmetric.
  • a further object of the invention is to provide a magnetron in which a greater frequency stability is attained, and in which less spurious modes occur, giving the tube a higher output.
  • the magnetron comprises a resonator system constituted by an even number of anodes or anode segments grouped to define a circular cylinder and interconnected by filamentary, strip-shaped or tubular conductors.
  • the conductors of which the same number are provided as the number of anodes present, interconnect anodes which, taken along the circumference of the cylindrical anode system, differ in ordinal number from one another by an odd number larger than one and smaller than half the number of anodes present.
  • the conductors are provided alternately at the two ends of the cylindrical anode system and have a length equal to about half the wavelength of the oscillations for which the magnetron was designed.
  • the conductors may be constituted by substantially rectilinear elements disposed at right angles to the axis of the anode system, or, alternatively, the conductors may be constituted by elements extending slightly helically on the outer side of the anode system. If the number of anodes present is not divisible by the difference in ordinal number between two interconnected anodes, in principle, a continuous assembly is obtained, constituted by anode segments and their mutual connections.
  • the system of connections is preferably built up in the following manner.
  • the conductors starting from anodes provided with odd numbers begin closer to the equatorial or central plane of the magnetron and terminate farther from the equatorial plane on an anode with an even number difiering from the starting anode by the desired higher ordinal number.
  • the conductors on the anode segments with even number begin closer to the equatorial plane and terminate slightly farther from the equatorial plane on anodes with odd numbers which differ by the desired ordinal number.
  • Figs. 1 and 2 are a plan view and a bottom view, respectively, of the anode system of a magnetron accord ing to the invention
  • Fig. 3 is a sectional view of the anode system shown in Figs. 1 and 2;
  • Figs. 4 and 5, 6 and 7, and 8 and 9 are plan views, respectively, of opposite ends of anode systems having different numbers of anodes and diflerences in ordinal numbers interconnected in accordance with the invention
  • Figs. 10 and 11 are a developed view and a perspective view, respectively, of a magnetron oscillatory system having 16 anodes interconnected in accordance with the invention.
  • Figs. 1, 2 and 3 are atop, bottom, and sectional view, respectively, of a magnetron having sixteen anodes and an ordinal number difference of 5.
  • the conductor which extends parallel to the cross-section, namely between the anode segments 1 and 6 is shown in full, whereas for the other conductors, only the cross-section is shown, the remainder of the path being indicated as broken off.
  • the anode segments are numbered from 1 to 16, and the conductors by the letters a to q, excluding the letter i.
  • the conductors a to q are constituted by substantially rectilinear strips having a central slight bend. All the strips are identical, and are of a length of a half wave length.
  • the magnetron has 12 anode segments and an ordinal number difference of 5.
  • the system of conductors and anode segments are traversed successively in the following manner:
  • the magnetron has 12 anode segments and an ordinal number difference of 3.
  • 12 is divisible by 3
  • the magnetron has 10 anode segments and an ordinal number diiference 3, the resonator system being cyclically traversed as follows:
  • Figs. 10 and 11 the same reference numerals are used as in Figs. 1, 2 and 3, the difference being that the conductors approach the equatorial plane 23 during the cyclic traversal instead of being directed away therefrom as in Figs. 1, 2 and 3.
  • the well-known strapping connections provided alternately between alternate anodes are indicated by 20 and 21, respectively. These latter connections are such that the points of connection are, as much as possible, located symmetrically with respect to the helical connections a to q. As may be seen from the drawing, the connections on top and on the bottom are right-handed and left-handed, respectively.
  • the resonant system of the invention affords the ad- 0 vantages of simplifying the connections between the anode segments, improving the frequency stability of the magnetron, increasing the power output, and decreasing the time for building up oscillations.
  • a magnetron resonator system comprising an even number of anode segments grouped to define a circular cylinder and the same number of conductors interconnecting said anode segments, each of said conductors interconnecting anodes which differ in ordinal number by an odd number larger than one and smaller than half the number of anodes, the onductors being alternately disposed at opposite ends of the .cylindrical anode system.
  • a magnetron resonator system as claimed in claim 2 in which the conductors are each constituted by substantially rectilinear elements disposed at right angles to the axis of the cylindrical anode system.
  • a magnetron resonator system as claimed in claim 2 in which the conductors are each constituted by elements extending slightly helically on the outer side of the anode system.
  • a magnetron resonator system as claimed in claim 1 in which the quotient of the number of anodes and the difference in ordinal number between two interconnected anodes includes a fraction, and the conductors constitute a single continuous assembly.
  • a magnetron resonator system as claimed in claim 1 in which the number of anodes is divisible by the ditference in ordinal number and the conductors constitute a number of coherent systems of anodes and associated connections equal to the difference in ordinal number.
  • a magnetron resonator system as claimed in'claim l in which additional strapping conductors are provided by which the anode segments on the outer side are alternateiy connected together.

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  • Microwave Tubes (AREA)
US381060A 1952-10-29 1953-09-18 Magnetron Expired - Lifetime US2721295A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL319391X 1952-10-29

Publications (1)

Publication Number Publication Date
US2721295A true US2721295A (en) 1955-10-18

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ID=19783926

Family Applications (1)

Application Number Title Priority Date Filing Date
US381060A Expired - Lifetime US2721295A (en) 1952-10-29 1953-09-18 Magnetron

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US (1) US2721295A (enrdf_load_html_response)
CH (1) CH319391A (enrdf_load_html_response)
DE (1) DE931544C (enrdf_load_html_response)
FR (1) FR1085716A (enrdf_load_html_response)
GB (1) GB744713A (enrdf_load_html_response)
NL (2) NL173440B (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906921A (en) * 1956-08-23 1959-09-29 Gen Electric Magnetron
US3013180A (en) * 1958-05-01 1961-12-12 Gen Electric Magnetron device and system
US3121822A (en) * 1960-10-28 1964-02-18 Gen Electric Circuits for unimoding crossed field devices
US3176188A (en) * 1960-10-28 1965-03-30 Gen Electric Mixed lines crossed fields oscillator or amplifier
US5061878A (en) * 1987-07-23 1991-10-29 English Electric Valve Company Limited Magnetron anode and method of manufacturing anode

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9723478D0 (en) 1997-11-07 1998-01-07 Eev Ltd Magnetrons

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418469A (en) * 1944-05-04 1947-04-08 Bell Telephone Labor Inc Tuner for multiresonators
US2480462A (en) * 1944-01-07 1949-08-30 Western Electric Co Tunable magnetron
US2496500A (en) * 1945-07-18 1950-02-07 Raytheon Mfg Co Electron discharge device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE663509C (de) * 1934-08-21 1938-08-08 Telefunken Gmbh Mehrfach geschlitzte Magnetronroehre
NL107565C (enrdf_load_html_response) * 1941-09-06

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480462A (en) * 1944-01-07 1949-08-30 Western Electric Co Tunable magnetron
US2418469A (en) * 1944-05-04 1947-04-08 Bell Telephone Labor Inc Tuner for multiresonators
US2496500A (en) * 1945-07-18 1950-02-07 Raytheon Mfg Co Electron discharge device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2906921A (en) * 1956-08-23 1959-09-29 Gen Electric Magnetron
US3013180A (en) * 1958-05-01 1961-12-12 Gen Electric Magnetron device and system
US3121822A (en) * 1960-10-28 1964-02-18 Gen Electric Circuits for unimoding crossed field devices
US3176188A (en) * 1960-10-28 1965-03-30 Gen Electric Mixed lines crossed fields oscillator or amplifier
US5061878A (en) * 1987-07-23 1991-10-29 English Electric Valve Company Limited Magnetron anode and method of manufacturing anode

Also Published As

Publication number Publication date
GB744713A (en) 1956-02-15
NL173440B (nl)
NL81348C (enrdf_load_html_response)
FR1085716A (fr) 1955-02-07
CH319391A (de) 1957-02-15
DE931544C (de) 1955-08-11

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