GB845818A - Improvements in resonant cavity magnetrons - Google Patents

Improvements in resonant cavity magnetrons

Info

Publication number
GB845818A
GB845818A GB27194/58A GB2719458A GB845818A GB 845818 A GB845818 A GB 845818A GB 27194/58 A GB27194/58 A GB 27194/58A GB 2719458 A GB2719458 A GB 2719458A GB 845818 A GB845818 A GB 845818A
Authority
GB
United Kingdom
Prior art keywords
cathode
parts
cylinders
type
aug
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
Application number
GB27194/58A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB845818A publication Critical patent/GB845818A/en
Expired legal-status Critical Current

Links

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
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for magnetrons
    • 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
    • H01J25/587—Multi-cavity magnetrons

Landscapes

  • Constitution Of High-Frequency Heating (AREA)

Abstract

845,818. Magnetrons. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 25 1958 [Aug. 27, 1957], No. 27194/58. Class 39(1). A resonant cavity magnetron with a dispenser-type cathode protruding within recesses in the pole-pieces 13 14 has the cathode surrounded by cylinders 37 of soft-magnetic material in the regions where the cathode enters the recesses and attached to the cathode by supports 38 of small cross-section and high thermal resistance. Suitable magnetic material with the Curie point at 930‹C. has the composition 49% Co, 2% V and the remainder iron. A suitable cathode temperature is 850‹C. The supports 38 e.g. radial or annular projections, are clamped between threaded parts 32 and the cathode end parts 23, 34. The threaded parts 32 have flanges 33 acting as the cathode end rings. The magnetic cylinders 37 have an inner diameter larger than that of the active surface of the cathode and an outer diameter smaller than that of the end rings. The flanges 33 and the magnetic cylinders are coated with emission inhibiting material 44 such as zirconium, obtained by sintering zirconium-hydride powder in a solution of amyl-acetate in vacuo at 1100‹C., titanium or carbon. The main part of the cathode consists of a porous tungsten body 30 impregnated with a barium-calcium aluminate obtained by melting together a mixture of barium carbonate, aluminium oxide and calcium carbonate in a molecular ratio of 5 : 2 : 3. The cathode is activated at a temperature of 1100‹C. Suitable dimensions and spacings between the various cathode parts are given. The magnetron may be of the rising sun type or of the strapped type.
GB27194/58A 1957-08-27 1958-08-25 Improvements in resonant cavity magnetrons Expired GB845818A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US845818XA 1957-08-27 1957-08-27

Publications (1)

Publication Number Publication Date
GB845818A true GB845818A (en) 1960-08-24

Family

ID=22185891

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27194/58A Expired GB845818A (en) 1957-08-27 1958-08-25 Improvements in resonant cavity magnetrons

Country Status (2)

Country Link
FR (1) FR1201868A (en)
GB (1) GB845818A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3308329A (en) * 1962-11-23 1967-03-07 Litton Industries Inc Thermionic emissive cathode with end structure for emissive suppression

Also Published As

Publication number Publication date
FR1201868A (en) 1960-01-06

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