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EP0370811A2 - Mikrowellenöfen - Google Patents

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Publication number
EP0370811A2
EP0370811A2 EP89312176A EP89312176A EP0370811A2 EP 0370811 A2 EP0370811 A2 EP 0370811A2 EP 89312176 A EP89312176 A EP 89312176A EP 89312176 A EP89312176 A EP 89312176A EP 0370811 A2 EP0370811 A2 EP 0370811A2
Authority
EP
European Patent Office
Prior art keywords
waveguides
oven
microwave
cavity
pair
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Withdrawn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
EP89312176A
Other languages
English (en)
French (fr)
Other versions
EP0370811A3 (de
Inventor
Michael John Dickinson
Christopher Gregson
Gordon Thomas Andrews
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.)
New World Domestic Appliances Ltd
Original Assignee
New World Domestic Appliances 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 New World Domestic Appliances Ltd filed Critical New World Domestic Appliances Ltd
Publication of EP0370811A2 publication Critical patent/EP0370811A2/de
Publication of EP0370811A3 publication Critical patent/EP0370811A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/70—Feed lines
    • H05B6/707—Feed lines using waveguides
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/72—Radiators or antennas
    • H05B6/725—Rotatable antennas

Definitions

  • This invention relates to microwave ovens which may be of conventional form or may be combination microwave ovens which incorporate a gas or electric heater in addition to the microwave energy source.
  • a microwave oven or a combination microwave oven as part of a stacked unit, with, for example, a grill or oven cavity disposed over the microwave oven cavity.
  • a stacked unit places constraints on the amount of space which can be provided between the bottom of the grill or oven cavity and the top of the microwave oven cavity and where a top microwave energy launch system is required, there is often insufficient space to use either the normal direct launch system or conventional waveguide launch systems.
  • a microwave oven comprising an oven cavity, a source of microwave energy for said oven cavity, and a waveguide system coupled to said source for launching microwave energy into said oven cavity, said waveguide system comprising a pair of angularly disposed waveguides disposed adjacent and parallel to a surface of said oven cavity.
  • the pair of waveguides will be disposed substantially at right angles to one another, it being conveniently arranged that the pair of waveguides are each of generally oblong rectangular cross-section, the major surfaces of each waveguide being disposed parallel to said surface of said oven cavity.
  • the pair of waveguides are disposed along adjacent edges of said surface, at least spart of the inner minor surface of each waveguide being open for launching microwave energy into said oven cavity.
  • one of said waveguides is provided with an extension thereof in the vicinity of the junction of the pair of waveguides, a microwave antenna which is coupled to said source of microwave energy being disposed in said extension for launching microwave energy into said waveguides, and at least one of said waveguides may be provided with a tuning plate along the length thereof, and/or with a tuning stub for matching the waveguide to said cavity.
  • a mode stirrer or a re-radiating antenna may be provided disposed between said pair of waveguides.
  • the waveguide system will be disposed in the top surface of the oven cavity.
  • a waveguide system 1 which forms the top surface of a microwave oven cavity depicted diagrammatically at 2.
  • the oven cavity 2 will normally be provided with a front opening to allow access thereto, and it should also be appreciated that the microwave oven of which the oven cavity 2 and the waveguide system 1 forms a part, may be a conventional microwave oven, or it may take the form of a combination microwave oven which incorporates a gas and/or electric heater in addition to the normal microwave energy source.
  • the arrangement shown in the drawing is particularly designed to enable a second cavity, which may take the form of a grill and/or conventional oven, to be positioned above the oven cavity 2, with a minimum of spacing between the two cavities.
  • the waveguide system 1 shown in the drawing consists of a generally rectangular, box shaped upper member 3 having a side extension 4 and a lower, generally "T" shaped, member 5 which is secured to the upper member 3.
  • the lower member 5, together with the upper member 3 and side extension 4 define a pair of waveguides 6 and 7 which are disposed at right angles to one another and each of which is of oblong rectangular cross-section, the major surfaces of which are parallel to the top surface of the oven cavity 2.
  • the waveguides 6 and 7 extend along respective adjacent edges 8 and 9 of the upper member 3 and their inside (minor) surfaces 10 and 11 respectively are open and afford launch "windows" through which microwave energy is launched into the oven cavity 2 via an open area 12 in the upper member 3 which extends between the waveguides 6 and 7 and the opposed edges of the upper member 3.
  • a magnetron assembly 13 Attached to the upper surface of the side extension 4 of the waveguide system 1 is a magnetron assembly 13 which is provided with a microwave antenna 14 which extends into the waveguide 6 and by means of which microwave energy is coupled into the waveguides 6 and 7.
  • each waveguide is provided with an optional tuning plate 15, the position of which is chosen to effect the required matching, and one or more tuning stubs 16 may also be provided.
  • a mode stirrer 17 is provided in the open area 12 between the waveguides 6 and 7, and this may be air blown or motor driven. Instead of a mode stirrer 17 a re-radiating antenna may be used.
  • the open area 12 of the waveguide system 1 may be provided with a heat resistant, microwave transparent cover between the waveguide system 1 and the oven cavity 2.
  • top launch of microwave energy into the oven cavity 2 is obtained even though the magnetron assembly 13 is located to one side of the oven cavity, thereby enabling a further cavity e.g. a grill and/or conventional oven, to be located immediately over the oven cavity 2.
  • a further cavity e.g. a grill and/or conventional oven
  • the waveguide system 1 constitutes the top surface of the oven cavity, it should be appreciated that it could equally well constitute other surfaces e.g. a back, side or bottom surface of the oven cavity.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP19890312176 1988-11-24 1989-11-23 Mikrowellenöfen Withdrawn EP0370811A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8827429A GB2227913A (en) 1988-11-24 1988-11-24 Microwave oven waveguide
GB8827429 1988-11-24

Publications (2)

Publication Number Publication Date
EP0370811A2 true EP0370811A2 (de) 1990-05-30
EP0370811A3 EP0370811A3 (de) 1991-12-18

Family

ID=10647379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890312176 Withdrawn EP0370811A3 (de) 1988-11-24 1989-11-23 Mikrowellenöfen

Country Status (2)

Country Link
EP (1) EP0370811A3 (de)
GB (1) GB2227913A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6894582B2 (en) 2003-02-07 2005-05-17 Harris Corporation Microwave device having a slotted coaxial cable-to-microstrip connection and related methods

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2151655A1 (de) * 1970-10-19 1972-04-20 Husqvarna Vapenfabriks Ab Mikrowellenwaermeapparat
CH554628A (de) * 1972-12-05 1974-09-30 Husqvarna Vapenfabriks Ab Mikrowellenofen.
US3949184A (en) * 1975-05-02 1976-04-06 Raytheon Company Folding microwave searing and browning means
EP0021045A1 (de) * 1979-06-21 1981-01-07 Litton Systems, Inc. Mikrowellenofen
DE3024178A1 (de) * 1980-06-27 1982-01-21 Licentia Gmbh Mikrowellenheizgeraet

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1407852A (en) * 1972-11-20 1975-09-24 Husqvarna Vapenfabriks Ab Microwave oven

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2151655A1 (de) * 1970-10-19 1972-04-20 Husqvarna Vapenfabriks Ab Mikrowellenwaermeapparat
CH554628A (de) * 1972-12-05 1974-09-30 Husqvarna Vapenfabriks Ab Mikrowellenofen.
US3949184A (en) * 1975-05-02 1976-04-06 Raytheon Company Folding microwave searing and browning means
EP0021045A1 (de) * 1979-06-21 1981-01-07 Litton Systems, Inc. Mikrowellenofen
DE3024178A1 (de) * 1980-06-27 1982-01-21 Licentia Gmbh Mikrowellenheizgeraet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6894582B2 (en) 2003-02-07 2005-05-17 Harris Corporation Microwave device having a slotted coaxial cable-to-microstrip connection and related methods

Also Published As

Publication number Publication date
EP0370811A3 (de) 1991-12-18
GB8827429D0 (en) 1988-12-29
GB2227913A (en) 1990-08-08

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