US2877380A - Magnetrons - Google Patents

Magnetrons Download PDF

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Publication number
US2877380A
US2877380A US721374A US72137458A US2877380A US 2877380 A US2877380 A US 2877380A US 721374 A US721374 A US 721374A US 72137458 A US72137458 A US 72137458A US 2877380 A US2877380 A US 2877380A
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US
United States
Prior art keywords
pins
tuning
magnetron
carrier
magnetrons
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
US721374A
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English (en)
Inventor
Esterson Maurice
Collis Alec Peter Orme
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.)
Teledyne UK Ltd
Original Assignee
English Electric Valve Co Ltd
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 English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
Application granted granted Critical
Publication of US2877380A publication Critical patent/US2877380A/en
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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
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/18—Resonators
    • H01J23/20—Cavity resonators; Adjustment or tuning thereof
    • H01J23/213—Simultaneous tuning of more than one resonator, e.g. resonant cavities of a magnetron

Definitions

  • This invention relates to magnetrons and more specifically to multiple resonant cavity tunable magnetrons of the kind in which tuning is accomplished by means of conductive pins carried upon an adjustable conductive carrier member and which project into the resonant cavities to an extent which can be altered by altering the position of the carrier member carrying the pins.
  • Figure 1 is a highly simplified diagrammatic representation of a known magnetron of the kind to which the invention relates and Figures 2 and 3 are mutually perpendicular views of a tuning assembly comprising a set of tuning pins with their carrier member as used in one embodiment of this invention.
  • this represents a multiple cavity magnetron of generally known form with a cylindrical cathode structure 1 coaxially within the usual anode system which is provided with resonant cavities 2 in a ring round the cathode.
  • the anode block is drilled parallel to the axis to take tuner pins 3 one of which extends into each resonant cavity (except the cavity provided with an energy takeoif loop in magnetrons in which there is such a cavity) to an extent which can be adjustable for purposes of tuning variation.
  • the magnetron represented in Figure 1 is of the strapped typed, straps being indicated at 4.
  • the tuner pins are carried on a carrier disc 5 which can be adjusted in the axial direction by means of a lead screw member or nut 6.
  • the screw is external to the evacuated space of the magnetron, vacuum being preserved by means of a flexible diaphragm 7 which completes the evacuated space and permits the required axial movement for tuning.
  • the tuning pin carrier member of a multiple resonant cavity tunable magnetron of the kind referred to is slotted between successive pairs of tuning pins (counting round the carrier) so that successive pairs of pins are divided off from one another by a slot.
  • the carrier is a disc with radial slots therein.
  • FIGS. 2 and 3 show one form of construction of tuner assembly for use in a magnetron in accordance with this invention.
  • the tuning assembly therein shown comprises a ring of metal tuner pins 3 mounted on and at right angles to a metal carrier disc 5 provided with a lead screw member or nut 6.
  • the assembly as so far described is as well known and is mounted in the magnetron in the manner shown in Figure 1 or in some similar known manner so that each pin projects into one of the cavities of the anode system to an extent which can be adjusted by adjusting the whole assembly axially of the magnetron.
  • slots 7, 7a extending radially of the carrier member 5 are provided with each slot being between successive pairs of tuning pins counting round the carrier, so that each pair of pins is between two slots.
  • one of the radial slots-that designated 7a and shown at three oclock in Figure 3- is made much wider than the others, 7, and is also tapered. This is for a reason which has nothing to do with the present invention as such but is merely because, in the particular magnetron for which the tuning assembly of Figures 2 and 3 is designed, the wide slot 7a is necessary in order to clear a part of the magnetron structure used for supporting the cathode.
  • this particular slot 7a is thus, as it were, fortuitous, and if it were not necessary to provide a clearance this particular slot would be like the others. Also in the construction shown in Figures 2 and 3 the pins do not occur at regular intervals all round the carrier member 5, there being a considerably larger space between the two pins shown at the top of Figure 3 than between any other two pins. As will be seen this considerably larger space corresponds to the omission of a pin which, if the required spacing was equal throughout, would be provided at 12 oclock in Figure 3.
  • a multiple resonant cavity tunable magnetron having a tuning pin carrier disc and a plurality of tuning pins carried thereon, said disc having a plurality of radial slots respectively extending between and dividing successive pairs of tuning pins from one another.
  • a multiple cavity magnetron comprising a cathode and an anode system co-axial with said cathode and having a plurality of resonant cavities in a ring round the axis, each cavity extending parallel to said axis and opening into an interaction space co-axially within the anode system, said anode system including a conductive disc carrier member at right angles to said axis, a plurality of parallel conductive tuner pins carried by said carrier member and extending parallel to said axis and entered respectively into said cavities, said carrier member having a plurality of slots lying along radii of said carrier member and between successive pairs of said tuning pins, and means for adjusting said carrier member longitudinally of said axis to adjust the positions of said tuning pins longitudinally of said cavities.

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  • Microwave Tubes (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
US721374A 1957-04-26 1958-03-14 Magnetrons Expired - Lifetime US2877380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB13357/57A GB822766A (en) 1957-04-26 1957-04-26 Improvements in or relating to magnetrons

Publications (1)

Publication Number Publication Date
US2877380A true US2877380A (en) 1959-03-10

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ID=10021493

Family Applications (1)

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US721374A Expired - Lifetime US2877380A (en) 1957-04-26 1958-03-14 Magnetrons

Country Status (4)

Country Link
US (1) US2877380A (it)
FR (1) FR1194823A (it)
GB (1) GB822766A (it)
NL (1) NL226186A (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002186A1 (en) * 1985-10-03 1987-04-09 Hughes Aircraft Company Non-reactive radial line power divider/combiner with integral mode filters

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2632131A (en) * 1952-12-10 1953-03-17 Raytheon Mfg Co Tunable magnetron
US2738441A (en) * 1951-04-02 1956-03-13 Itt Tuning means for magnetrons

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2738441A (en) * 1951-04-02 1956-03-13 Itt Tuning means for magnetrons
US2632131A (en) * 1952-12-10 1953-03-17 Raytheon Mfg Co Tunable magnetron

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002186A1 (en) * 1985-10-03 1987-04-09 Hughes Aircraft Company Non-reactive radial line power divider/combiner with integral mode filters
US4812782A (en) * 1985-10-03 1989-03-14 Hughes Aircraft Company Non-reactive radial line power divider/combiner with integral mode filters

Also Published As

Publication number Publication date
FR1194823A (fr) 1959-11-12
NL226186A (it)
GB822766A (en) 1959-10-28

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