US1860152A - High frequency magnetron apparatus - Google Patents

High frequency magnetron apparatus Download PDF

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Publication number
US1860152A
US1860152A US389067A US38906729A US1860152A US 1860152 A US1860152 A US 1860152A US 389067 A US389067 A US 389067A US 38906729 A US38906729 A US 38906729A US 1860152 A US1860152 A US 1860152A
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US
United States
Prior art keywords
anodes
cathode
anode
high frequency
oscillations
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
US389067A
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English (en)
Inventor
Elmer D Mcarthur
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.)
General Electric Co
Original Assignee
General Electric Co
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 BE372988D priority Critical patent/BE372988A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US389067A priority patent/US1860152A/en
Priority to DE1930564818D priority patent/DE564818C/de
Application granted granted Critical
Publication of US1860152A publication Critical patent/US1860152A/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
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B9/00—Generation of oscillations using transit-time effects
    • H03B9/01—Generation of oscillations using transit-time effects using discharge tubes
    • H03B9/10—Generation of oscillations using transit-time effects using discharge tubes using a magnetron

Definitions

  • the present invention relates to the construction and operation of electron discharge apparatus and more particularly to devices in which the direction and flow of electrons are controlled by combined magnetic and electrostatic fields in such a manner as to produce a negative resistance characteristic, indicative of the ability to produce oscillations when connected in appropriate circuits.
  • Apparatus of this character employs a source of electrons and one or more pairs of symmetrically arranged electron receiving surfaces, the travel of electrons being directed by a suitably applied electrostatic field and an externally located solenoid.
  • .T he electron receiving surfaces constitute anodes which usually take the form of segments of a cylinder, While the source of electrons consists of a filament disposed in the longitudinal axis of the cylinder.
  • a device of this sort may be termed, for convenience, a split anode magnetron and examples of construction are disclosed and claimed in an application Serial No. 285,008, filed in the name of K. Okahe, June 13, 1928, entitled Extra short wave generating apparatus, also described by H. Yagi in an article entitled Beam transmission of ultra short waves appearing in Proc.
  • the split anode magnetron offers an advantage over electrostatically controlled electron discharge devices in that the interelectrode capacity is comparatively small and hence when the device is connected in suitable circuits oscillations of short wave lengths and of considerable amplitude may be generated.
  • An object of the present invention is to provide a magnetron of the split anode type with an electrode construction which offers the minimum electrostatic capacit This object is attained in brief, by providing relatively flat anodes instead of cylindrical members and presenting each anode edgewise, or substantially so, to the cathode.
  • anode in addition to failing to offer a minimum capacity also tends to heat unevenly over the surface.
  • the hottest portion of each anode resides in a restricted region along one axial edge while the remainder runs comparatively cool and it is apparent that the maximum output, deter mined by the temperature of the hottest portion, is considerably lower than when the entire surface of the anode runs uniformly at the maximum elevated temperature.
  • another object of the invention is to provide an improved electrode construction and arrangement in which the anode members are heated evenly whereby the output may be maintained at an optimum value.- I have discovered that a fiat anode construction lends itself particularly well to this object under operating conditions as well as to the previously stated object.
  • Fig. 1 is a side elevational view of an impi;oved form of magnetron showing also a cross section of the solenoid accessory and associated circuits;
  • Fig. 2 illustrates a crosssection of the device shown in Fig. 1 taken along the line 22; while Figs. 3 and 4 are graphs depicting certain operating characteristics of the magnetron.
  • numeral 1 designates a highly evacuated envelope containing a cathode in the form of a longitudinally dis-- posed rectilinear filament 2, supported at one end from the press 5 by means of an anchor wire 6 and a tension spring 7. About the spring and attached to the upper filament May 24, 1932.
  • the anodes are located in a plane common to the filamentary cathode, it is evident that the advantages .of my discovery also apply to those modifications in which the plane of the anodes does not contain the cathode or in which the anodes themselves do not lie in the same plane. From a purely efliciency standpoint and apart from the interelectrode capacity or frequency consideration, the most effective position of the anodes Y may be such that the surface intercepts the path of electrons at an angle substantially normal thereto.
  • the electron paths take the form of spirals havin their origin at the cathode and the size of which is etermined by the instantaneous effect of the electrostatic and magnetic fields. It is apparent so that as the electrodes are moved, if necessary,
  • an evacuated envelope containin a cathode a plurality of anodes symmetrica y with respect to the cathode, means for producing a cooperating magnetic field, a circuit containing a concentrated inductance and concentrated capacitance connected across the anodes, and a connection between said circuit and the cathode, said anodes being constituted of plates arranged in a sin 1e plane and resented edgewise to the cath e.
  • an evacuated envelope containing a rectilinear, filament, a plurality of substantially flat anodes presented edgewise to the filament, a solenoid disposed about the envelope in such a manner t at the magnetic lines of force traverse the space between the filament and the anodes in a direction parallel thereto, a resonant circuit connected between the anodes, a connection between said circuit and the filament, said anodes being arranged in a single plane common to the filament.
  • a cooperating magnetic field a resonant cir- I cuit connected across the anodes and a connection between said circuit and the cathode, said anodes being substantially flat and lying in the plane of the cathode whereby the operating efliciency of the device is maintained at an optimum value.

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  • Microwave Tubes (AREA)
US389067A 1929-08-28 1929-08-28 High frequency magnetron apparatus Expired - Lifetime US1860152A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE372988D BE372988A (enrdf_load_html_response) 1929-08-28
US389067A US1860152A (en) 1929-08-28 1929-08-28 High frequency magnetron apparatus
DE1930564818D DE564818C (de) 1929-08-28 1930-07-27 Magnetronroehre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US389067A US1860152A (en) 1929-08-28 1929-08-28 High frequency magnetron apparatus

Publications (1)

Publication Number Publication Date
US1860152A true US1860152A (en) 1932-05-24

Family

ID=23536679

Family Applications (1)

Application Number Title Priority Date Filing Date
US389067A Expired - Lifetime US1860152A (en) 1929-08-28 1929-08-28 High frequency magnetron apparatus

Country Status (3)

Country Link
US (1) US1860152A (enrdf_load_html_response)
BE (1) BE372988A (enrdf_load_html_response)
DE (1) DE564818C (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524179A (en) * 1944-04-13 1950-10-03 Edwin G Schneider Tuned ultra high frequency thermionic detector
US2558603A (en) * 1949-03-04 1951-06-26 Dunlee Corp Protective means for rectifier cathodes
US2630549A (en) * 1948-08-31 1953-03-03 Rca Corp High-voltage generator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617968A (en) * 1946-09-28 1952-11-11 Csf Magnetron tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2524179A (en) * 1944-04-13 1950-10-03 Edwin G Schneider Tuned ultra high frequency thermionic detector
US2630549A (en) * 1948-08-31 1953-03-03 Rca Corp High-voltage generator
US2558603A (en) * 1949-03-04 1951-06-26 Dunlee Corp Protective means for rectifier cathodes

Also Published As

Publication number Publication date
DE564818C (de) 1932-11-23
BE372988A (enrdf_load_html_response) 1930-09-30

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