EP0225308A2 - Koaxialer Übergang für ein Magnetron - Google Patents

Koaxialer Übergang für ein Magnetron Download PDF

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Publication number
EP0225308A2
EP0225308A2 EP86850429A EP86850429A EP0225308A2 EP 0225308 A2 EP0225308 A2 EP 0225308A2 EP 86850429 A EP86850429 A EP 86850429A EP 86850429 A EP86850429 A EP 86850429A EP 0225308 A2 EP0225308 A2 EP 0225308A2
Authority
EP
European Patent Office
Prior art keywords
tube
magnetron
coaxial line
antenna
diameter
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.)
Withdrawn
Application number
EP86850429A
Other languages
English (en)
French (fr)
Other versions
EP0225308A3 (de
Inventor
Per Olov Gustav Risman
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.)
SKANDINAVISK TORKTEKNIK AB
Original Assignee
SKANDINAVISK TORKTEKNIK AB
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 SKANDINAVISK TORKTEKNIK AB filed Critical SKANDINAVISK TORKTEKNIK AB
Publication of EP0225308A2 publication Critical patent/EP0225308A2/de
Publication of EP0225308A3 publication Critical patent/EP0225308A3/de
Withdrawn legal-status Critical Current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
    • H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
    • H01J23/48—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type

Definitions

  • the present invention consists of a coupling device from a magnetron with a quarter-wave antenna directly to a coaxial line, without an intermediate structure using a common rectangular TE10 wave type.
  • the exit ports of magnetrons for the frequency 2.45 GHz for microwave heating purposes are standardized for common types in the power range 500 - 1500 W.
  • the magnetron is normally coupled to a TE10 waveguide by a common transverse transition, the typical guide cross section being 50 x 90 mm and the distance to the short-circuiting wall from the magnetron antenna axis 20 - 25 mm.
  • the coupling is however directly into the cavity, in which a secondary metal antenna (normally rotating) in close vicinity to the magnetron antenna acts as a matching element.
  • the object of the invention is built firstly of a cylindrical metal tube 1 around the magnetron antenna2.
  • the tube is fixed to a plate 3 which fits the connection devices 4 of the magnetron, with screws 5 and a directly contacting sealing ring 9.
  • the tube diameter is less than that for cut-off of the lowest mode, allowing it to be open at the top without causing any lekage.
  • a simple protecting device 6 may however be used, against mechanical influences and to eliminate contamination.
  • the tube operates with a combination of the coaxial TEM and the cylindrical TM01 modes.
  • An essential property is that the capacitance to the magnetron antenna can be adjusted for matching by parallel displacement of the tube axis in relation to that of the magnetron antenna (to the left in Figure 1).
  • a metal conductor 7 is fixed and in metal contact by e.g. a screw to the magnetron antenna.
  • the conductor is at a right angle to the magnetron antenna axis and is later converted to inner conductor of the coaxial line.
  • the coaxial outer conductor 10 is fixed to a hole in the tube wall.
  • the metal conductor forms an inductive element together with the magnetron antenna and the adjacent tube wall part 11.
  • the magnitude is determined by e.g. the conductor height above the bottom plate 3 and by the distance between the magnetron antenna and the wall part 11.
  • the inductive element can thus be varied by the same parallel displacement of the tube 1 i relation to the magnetron axis as has been discussed above.
  • the inner diameter of the tube 1 is 41 mm.
  • the diameter of the contacting seal 9 is 32 mm and the axial displacement of the tube towards the coaxial output port is 4.5 mm.
  • the distance from the bottom plate 3 to the axis of the coaxial line output port is 32 mm, the diameter of the hole 8 is about 7 mm and the characteristic impedance of the coaxial line is 50 ohm.

Landscapes

  • Microwave Tubes (AREA)
EP86850429A 1985-12-06 1986-12-08 Koaxialer Übergang für ein Magnetron Withdrawn EP0225308A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8505773A SE8505773L (sv) 1985-12-06 1985-12-06 Koaxialovergang for magnetron
SE8505773 1985-12-06

Publications (2)

Publication Number Publication Date
EP0225308A2 true EP0225308A2 (de) 1987-06-10
EP0225308A3 EP0225308A3 (de) 1989-05-03

Family

ID=20362368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86850429A Withdrawn EP0225308A3 (de) 1985-12-06 1986-12-08 Koaxialer Übergang für ein Magnetron

Country Status (2)

Country Link
EP (1) EP0225308A3 (de)
SE (1) SE8505773L (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003079393A1 (en) * 2002-03-16 2003-09-25 E2V Technologies (Uk) Limited Magnetron arrangements

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH226859A (de) * 1941-07-14 1943-04-30 Telefunken Gmbh Doppelleitung für Dezimeterwellen.
GB617236A (en) * 1942-07-25 1949-02-03 Sperry Gyroscope Co Inc Improvements in or relating to devices for attenuating high frequency electromagnetic energy
BE478854A (de) * 1942-09-01
US2557391A (en) * 1942-10-07 1951-06-19 Westinghouse Electric Corp Coupling device for micro-wave energy
FR2318515A1 (fr) * 1975-07-18 1977-02-11 Lignes Telegraph Telephon Monture de diode hyperfrequence
US4618840A (en) * 1984-04-09 1986-10-21 Hughes Aircraft Company Air-line microwave coaxial reversing switch having diagonally switched path

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003079393A1 (en) * 2002-03-16 2003-09-25 E2V Technologies (Uk) Limited Magnetron arrangements
GB2386748B (en) * 2002-03-16 2006-02-08 Marconi Applied Techn Ltd Magnetron arrangements
US7199524B2 (en) 2002-03-16 2007-04-03 E2V Technologies (Uk) Limited Magnetron arrangements

Also Published As

Publication number Publication date
SE8505773L (sv) 1987-06-07
EP0225308A3 (de) 1989-05-03
SE8505773D0 (sv) 1985-12-06

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Inventor name: RISMAN, PER OLOV GUSTAV