US3843862A - Microwave oven having tm and te modes - Google Patents

Microwave oven having tm and te modes Download PDF

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Publication number
US3843862A
US3843862A US00430731A US43073174A US3843862A US 3843862 A US3843862 A US 3843862A US 00430731 A US00430731 A US 00430731A US 43073174 A US43073174 A US 43073174A US 3843862 A US3843862 A US 3843862A
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heating
heating cavity
cavity
low impedance
side walls
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US00430731A
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J Staats
L Fitzmayer
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General Electric Co
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General Electric Co
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    • 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
    • H05B6/705—Feed lines using microwave tuning
    • 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
    • H05B6/6426—Aspects relating to the exterior of the microwave heating apparatus, e.g. metal casing, power cord
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • a counter-top microwave oven comprises an upstanding box-like metal wall structure defining a heating cavity, a microwave generator, transmission means including a probe antenna for radiating the microwaves into the heating cavity from the top thereof, and tuning means disposed in the heating cavity adjacent to the top thereof, the cavity being so dimensioned and the antenna and tuning means being so positioned as to excite in the cavity a predetermined low impedance transverse magnetic field mode and a predetermined high impedance transverse electric field mode having a low impedance region in the portion of the heating cavity in which food is normally placed.
  • Two alternative positions of the tuning means for establishing the preferred field patterns are disclosed.
  • the present invention relates to electronic heating apparatus of the type commonly referred to as a microwave oven, and specifically to a microwave oven of the countertop variety which has a heating cavity with dimensions generally comparable to a wavelength of the microwave energy used. More particularly, the present invention is an improvement of the invention disclosed in our copending US. application Ser. No. 430,730, filed Jan 4, 1974, entitled MICROWAVE OVEN WITH PREFERRED MODES, and assigned to the assignee of the present invention.
  • Another object of this invention is to provide an electronic heating apparatus of the character described, which includes coupling means whereby the TM and TE modes may both be excited from the same antenna.
  • An important object of the present invention is to provide an electronic heating apparatus for heating a low impedance body, the apparatus comprising a metal enclosure in the form of a rectangular parallelepiped including a top wall, a bottom wall, a front wall, a rear wall and two opposed side walls defining a heating cavity for receiving therein a body to be heated, source means including a probe antenna electrically coupled to the heating cavity along the top wall for transmitting microwave energy of a predetermined wavelength A into the heating cavity to excite therein two predetermined electromagnetic field modes,'the heating cavity having an electrical width substantially equal to 1.2 A and an electrical height substantially equal to 0.633 A and an electrical depth substantially equal to 1.1 A, and tuning means disposed in the heating cavity adjacent to the top thereof, one of the predetermined electromagnetic field modes being a relatively low impedance transverse magnetic field mode, the other of the predetermined electromagnetic field modes being a relatively high impedance transverse electric field mode having a relatively low impedance region generally centrally of the heating cavity, whereby there is established in the heating cavity an electromagnetic
  • FIG. 1 is a front perspective view of a microwave oven including a heating enclosure constructed in accordance with and embodying the features of the present invention
  • FIG. 2 is a diagrammatic transparent perspective view of a first form of the heating cavity of the electronic heating apparatus of FIG. 1 for producing transverse magnetic and transverse electric field modes;
  • FIG. 3 is a view similar to FIG. 2 showing a second form of the heating cavity of the electronic heating apparatus of FIG. 1.
  • FIGS. 1 and 2 of the drawings there is illustrated a microwave oven, generally designated by the numeral 10, constructed in accordance with and embodying the features of the present invention.
  • the microwave oven 10 is adapted for placement on top of a table or counter and is housed in a cabinet which includes an upstanding front panel 11, a rear wall 12, a top wall 13, a bottom wall 14 and a pair of opposed side walls 16 and 17.
  • a heating enclosure mounted within the oven cabinet alongside the front panel 1 1 is a heating enclosure, generally designated by the numeral 20, including a top wall 21, a bottom wall 22, a rear wall 23 and a pair of opposed side walls 24 and 26, the front of the heating enclosure 20 being closed by a door 15 which, in the closed position thereof, forms the front wall of the heating enclosure 20, which enclosure is generally in the form of a rectangular parallelepiped.
  • the heating enclosure 20 serves to separate the interior of the oven cabinet into a heating cavity defined within the heating enclosure 20 for receiving therein and heating a food load 18, and a machinery compartment 25 between the heating enclosure 20 and the oven cabinet walls l2, l3, l4 and 17.
  • a magnetron 27 mounted in the machinery compartment 25 is a magnetron 27, a power supply 28 and a coaxial microwave transmission line (not shown) which transmits microwave energy from the magnetron 27 to the interior of the heating enclosure 20.
  • the magnetron 27, power supply '28 and transmission line may be of any suitable type, but preferably they are substantially identical in construction and operation to the magnetron, power supply and'transmission line disclosed in the aforementioned copending US. application Ser. No. 430,730, whereby .there is here described in detail only so much of the structure of the microwave oven as is necessary to an understanding of the present invention.
  • the coaxial transmission line from the magnetron 27 hasan outer conductor which is designated by the nuv meral 29 in FIG. 2, and terminates at the top wall 21 of the heating enclosure 20, the inner conductor of the transmission line terminating at a probe antenna 30,
  • the probeantenna 30 and the tuning probe 35 are so dimensionedas to provide equal heating to a food load placed either in the back or the front of the heating cavity. 7
  • FIG. 3 of the drawings there is illustrated an alternative arrangement of the heating enclosure 20, which is substantially identicaltothe arrangement illustrated'in FIG. 2, except that there is provided a tuning probe 45 extending verticallydownwardly into the heating cavity from the top wall 21 at a location thereon substantially midway between the side walls 24 and 26 and spaced approximately 2/4 from the front wall or oven door 15.
  • the same electromagnetic tield modes are excited inboth thearrangements of FIGS, 2'and 3, the only difference being slight adjustments in the composite heating patterns.
  • x corresponds to the width of the heating cav ity
  • y corresponds to the height of the heating cavity
  • 2 corresponds to the depthv of the heating cavity.
  • an electronic heating apparatusf which includes, a heating cavf ity 'sojdimen'sioned and a. probe antenna and tuning member sopositioned adjacent to the top of the heating cavity'that there isproduced in the heating cavity I a predetermined low impedance TM field mode and a predetermined high impedance TE field mode havinga low impedance regionin the position where food is
  • TM field mode a predetermined low impedance TM field mode
  • a predetermined high impedance TE field mode havinga low impedance regionin the position where food is
  • Aconductive tuning rod or probe 35 is disposed substantially centrally of the top wall 21*of the heating entionsmay be made therein, and it-is intended to cover in 'thefappendedclaims all such modifications as fall within the true spirit and 'scope of the invention.
  • r Electronic heating apparatus for heating a low im pedancebody, said apparatus comprising a metal en closure inth'e form of a rectangular parallelepiped including a topwall, a bottom wall, 'a'front wall, a rear wall and 'two'oppose'd side walls jdefining a heating ca'v ity for receiving therein abody to beheated, source means including a probe antenna electrically coupled to said heatingcavity along said top wall "for transmitting microwave energy of ta-predeterminedwavelength closure 20 and extends vertically downwardly into the y 1 arelatively high impedance transverse, electric field.
  • said heating cavity havingan electrical width substantiallyequal to 1. 2 )t and an electrical height substantially equal to 0.633 A and an electrical depth substantially equal-to l.l.)t,'and tun'ing'rneans; disposed in said heating cavity adjacent tothe top thereof, oneof said predetermined electromagnetic field modes beinga relatively low impedance transverse magneticfield mode, the'jother' of said predetermined electromagnetic field modejsbeing mode havinga relativelylow impedance region, generally, centrallyof said. heating cavity, whereby there is established in saidheatingcavity an electromagnetic field pattern providing uniform heating of an associated lowimpedanee body.
  • heating field device to 4.
  • said antenna is disposed substantially midway between said side walls and is spaced from said rear wall an electrical distance one-fourth the depth of said heating cavity
  • said tuning means being disposed substantially midway between said side walls and being spaced from said front wall an electrical distance onefourth of the depth of said heating cavity.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

A counter-top microwave oven comprises an upstanding box-like metal wall structure defining a heating cavity, a microwave generator, transmission means including a probe antenna for radiating the microwaves into the heating cavity from the top thereof, and tuning means disposed in the heating cavity adjacent to the top thereof, the cavity being so dimensioned and the antenna and tuning means being so positioned as to excite in the cavity a predetermined low impedance transverse magnetic field mode and a predetermined high impedance transverse electric field mode having a low impedance region in the portion of the heating cavity in which food is normally placed. Two alternative positions of the tuning means for establishing the preferred field patterns are disclosed.

Description

United States Patent [191 Staats et a1.
[ MICROWAVE OVEN HAVING TM AND TE MODES [75] inventors: James E. Staats; Louis H.
Fitzmayer, both of Louisville, Ky.
[73] Assignee: General Electric Company,
Louisville, Ky.
22 Filed: Jan. 4, 1974 21 Appl.No.:430,731
Primary Examiner-J. V. Truhe Assistant ExaminerHugh D. .laeger Attorney, Agent, or Firm-Prangley, Dithmar, Vogel, Sandler & Stotland [111 3,843,862 [451 Oct. 22, 1974 5 7 ABSTRACT A counter-top microwave oven comprises an upstanding box-like metal wall structure defining a heating cavity, a microwave generator, transmission means including a probe antenna for radiating the microwaves into the heating cavity from the top thereof, and tuning means disposed in the heating cavity adjacent to the top thereof, the cavity being so dimensioned and the antenna and tuning means being so positioned as to excite in the cavity a predetermined low impedance transverse magnetic field mode and a predetermined high impedance transverse electric field mode having a low impedance region in the portion of the heating cavity in which food is normally placed. Two alternative positions of the tuning means for establishing the preferred field patterns are disclosed.
PATENTEUncr 22 mm FIG./
1 MICROWAVE OVEN HAVING TM AND TE MODES BACKGROUND OF THE INVENTION The present invention relates to electronic heating apparatus of the type commonly referred to as a microwave oven, and specifically to a microwave oven of the countertop variety which has a heating cavity with dimensions generally comparable to a wavelength of the microwave energy used. More particularly, the present invention is an improvement of the invention disclosed in our copending US. application Ser. No. 430,730, filed Jan 4, 1974, entitled MICROWAVE OVEN WITH PREFERRED MODES, and assigned to the assignee of the present invention.
In that copending application, there were disclosed a number of different forms of a microwave oven heating enclosure, the dimensions and antenna location of which provided for the excitation in the heating cavity of two complementary transverse electric (TE) field modes, thereby resulting in a heating pattern which afforded fairly uniform heating of a wide variety of low impedance food loads.
As an alternative means for achieving composite field patterns having improved heating characteristics in microwave ovens, attemps have been made to utilize a low impedance transverse magnetic (TM) wave to improve the microwave heating of low impedance food by reducing the voltage standing wave ratio in the heating cavity. Results of these attempts have not been entirely satisfactory because a region in the center of the heating cavity did not afford adequate heating. One solution to this problem which has given good results is the use of a near field device disposed beneath the food load to heat food in the central region of the heating cavity. However, this near field device requires the use of a dielectric shelf for supporting the food load.
SUMMARY OF THE INVENTION It is a general object of the present invention to provide an electronic heating apparatus characterized by a heating cavity having excited therein a predetermined transverse magnetic field mode and a predetermined transverse electric field mode, resulting in a composite field pattern which provides uniform heating of low impedance foods throughout the heating cavity.
Another object of this invention is to provide an electronic heating apparatus of the character described, which includes coupling means whereby the TM and TE modes may both be excited from the same antenna.
An important object of the present invention is to provide an electronic heating apparatus for heating a low impedance body, the apparatus comprising a metal enclosure in the form of a rectangular parallelepiped including a top wall, a bottom wall, a front wall, a rear wall and two opposed side walls defining a heating cavity for receiving therein a body to be heated, source means including a probe antenna electrically coupled to the heating cavity along the top wall for transmitting microwave energy of a predetermined wavelength A into the heating cavity to excite therein two predetermined electromagnetic field modes,'the heating cavity having an electrical width substantially equal to 1.2 A and an electrical height substantially equal to 0.633 A and an electrical depth substantially equal to 1.1 A, and tuning means disposed in the heating cavity adjacent to the top thereof, one of the predetermined electromagnetic field modes being a relatively low impedance transverse magnetic field mode, the other of the predetermined electromagnetic field modes being a relatively high impedance transverse electric field mode having a relatively low impedance region generally centrally of the heating cavity, whereby there is established in the heating cavity an electromagnetic field pattern providing unifonn heating of an associated low impedance body.
Further features of the invention pertain to the particular arrangement of the parts of the electronic heating apparatus whereby the above-outlined and additional operating features thereof are attained.
The invention, both as to its organization and method of operation, together with further objects and advantages thereof, will best be understood by reference to the following specification taken in connection with the accompanying drawings.
BREIF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front perspective view of a microwave oven including a heating enclosure constructed in accordance with and embodying the features of the present invention;
FIG. 2 is a diagrammatic transparent perspective view of a first form of the heating cavity of the electronic heating apparatus of FIG. 1 for producing transverse magnetic and transverse electric field modes; and
FIG. 3 is a view similar to FIG. 2 showing a second form of the heating cavity of the electronic heating apparatus of FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now in particular to FIGS. 1 and 2 of the drawings, there is illustrated a microwave oven, generally designated by the numeral 10, constructed in accordance with and embodying the features of the present invention. The microwave oven 10 is adapted for placement on top of a table or counter and is housed in a cabinet which includes an upstanding front panel 11, a rear wall 12, a top wall 13, a bottom wall 14 and a pair of opposed side walls 16 and 17. Mounted within the oven cabinet alongside the front panel 1 1 is a heating enclosure, generally designated by the numeral 20, including a top wall 21, a bottom wall 22, a rear wall 23 and a pair of opposed side walls 24 and 26, the front of the heating enclosure 20 being closed by a door 15 which, in the closed position thereof, forms the front wall of the heating enclosure 20, which enclosure is generally in the form of a rectangular parallelepiped.
Thus, the heating enclosure 20 serves to separate the interior of the oven cabinet into a heating cavity defined within the heating enclosure 20 for receiving therein and heating a food load 18, and a machinery compartment 25 between the heating enclosure 20 and the oven cabinet walls l2, l3, l4 and 17. Mounted in the machinery compartment 25 is a magnetron 27, a power supply 28 and a coaxial microwave transmission line (not shown) which transmits microwave energy from the magnetron 27 to the interior of the heating enclosure 20.
The magnetron 27, power supply '28 and transmission line may be of any suitable type, but preferably they are substantially identical in construction and operation to the magnetron, power supply and'transmission line disclosed in the aforementioned copending US. application Ser. No. 430,730, whereby .there is here described in detail only so much of the structure of the microwave oven as is necessary to an understanding of the present invention.
The coaxial transmission line from the magnetron 27 hasan outer conductor which is designated by the nuv meral 29 in FIG. 2, and terminates at the top wall 21 of the heating enclosure 20, the inner conductor of the transmission line terminating at a probe antenna 30,
I which projects vertically downwardly into the heating of low impedance food loads in various positions in the heating cavity. Preferably, the probeantenna 30 and the tuning probe 35 are so dimensionedas to provide equal heating to a food load placed either in the back or the front of the heating cavity. 7
Referring now toFlG. 3 of the drawings, there is illustrated an alternative arrangement of the heating enclosure 20, which is substantially identicaltothe arrangement illustrated'in FIG. 2, except that there is provided a tuning probe 45 extending verticallydownwardly into the heating cavity from the top wall 21 at a location thereon substantially midway between the side walls 24 and 26 and spaced approximately 2/4 from the front wall or oven door 15. The same electromagnetic tield modes are excited inboth thearrangements of FIGS, 2'and 3, the only difference being slight adjustments in the composite heating patterns.
From the foregoing, it can be seen that there has been provided an improved electronic oven which affords uniform heating of a wide variety of low impedance food loads by the use of TM and TE field modes v in the heating cavity.
wherein x corresponds to the width of the heating cav ity, y corresponds to the height of the heating cavity and 2 corresponds to the depthv of the heating cavity. 30
normally placed in the-heating cavity.
More particularly, there-has been provided an electronic heating apparatusfwhich includes, a heating cavf ity 'sojdimen'sioned and a. probe antenna and tuning member sopositioned adjacent to the top of the heating cavity'that there isproduced in the heating cavity I a predetermined low impedance TM field mode and a predetermined high impedance TE field mode havinga low impedance regionin the position where food is There hasv also been provided'an electronic apparatus which utilizes both TM'andTE field modes,
excite the TM field mode.
without necessitating the use of a near While there have beend'escribed what are at present considered to be the preferred embodiments ofthe invention, it will be understood that'various modificaimpedance, the dimerisiohD of the'heating cavity in the direction'of power flow should be' D" ens-six" It has been found that when the heating enclosure 20 has'dimensions according to these relationships, such antenna 30 is positioned as illustrated in FIG. 2 substa'ntially midway between the side walls 24-and 26 and approximately z/4 fromthe rear wall,23,,thereare pro duced in the heating cavity the TMmM and the TE electromagnetictield modes, wherein the numeral sub scripts represent, respectively, the field variations in the 'x, y and 2 directions, and the letter subscript indicatesthe direction of power flow. Y
Aconductive tuning rod or probe 35 is disposed substantially centrally of the top wall 21*of the heating entionsmay be made therein, and it-is intended to cover in 'thefappendedclaims all such modifications as fall within the true spirit and 'scope of the invention.
Whatisclaimedis: r 1. Electronic heating apparatus for heating a low im pedancebody, said apparatus comprising a metal en closure inth'e form of a rectangular parallelepiped including a topwall, a bottom wall, 'a'front wall, a rear wall and 'two'oppose'd side walls jdefining a heating ca'v ity for receiving therein abody to beheated, source means including a probe antenna electrically coupled to said heatingcavity along said top wall "for transmitting microwave energy of ta-predeterminedwavelength closure 20 and extends vertically downwardly into the y 1 arelatively high impedance transverse, electric field.
A into said heating cavity to excite therein two prede# terrnined electromagnetic field modes, said heating cavity havingan electrical width substantiallyequal to 1. 2 )t and an electrical height substantially equal to 0.633 A and an electrical depth substantially equal-to l.l.)t,'and tun'ing'rneans; disposed in said heating cavity adjacent tothe top thereof, oneof said predetermined electromagnetic field modes beinga relatively low impedance transverse magneticfield mode, the'jother' of said predetermined electromagnetic field modejsbeing mode havinga relativelylow impedance region, generally, centrallyof said. heating cavity, whereby there is established in saidheatingcavity an electromagnetic field pattern providing uniform heating of an associated lowimpedanee body. J I
heating field device to 4. The electronic heating apparatus set forth in claim 1, wherein said antenna is disposed substantially midway between said side walls and is spaced from said rear wall an electrical distance one-fourth the depth of said heating cavity, said tuning means being disposed substantially midway between said side walls and being spaced from said front wall an electrical distance onefourth of the depth of said heating cavity.
5. The electronic heating apparatus set forth in claim 1, wherein A is approximately equal to 12.9 inches.

Claims (5)

1. Electronic heating apparatus for heating a low impedance body, said apparatus comprising a metal enclosure in the form of a rectangular parallelepiped including a top wall, a bottom wall, a front wall, a rear wall and two opposed side walls defining a heating cavity for receiving therein a body to be heated, source means including a probe antenna electrically coupled to said heating cavity along said top wall for transmitting microwave energy of a predetermined wavelength lambda into said heating cavity to excite therein two predetermined electromagnetic field modes, said heating cavity having an electrical width substantially equal to 1.2 lambda and an electrical height substantially equal to 0.633 lambda and an electrical depth substantially equal to 1.1 lambda , and tuning means disposed in said heating cavity adjacent to the top thereof, one of said predetermined electromagnetic field modes being a relatively low impedance transverse magnetic field mode, the other of said predetermined electromagnetic field modes being a relatively high impedance transverse electric field mode having a relatively low impedance region generally centrally of said heating cavity, whereby there is established in said heating cavity an electromagnetic field pattern providing uniform heating of an associated low impedance body.
2. The electronic heating apparatus set forth in claim 1, wherein said antenna is disposed substantially midway between said side walls and is spaced from said rear wall an electrical distance one-fourth the depth of said heating cavity.
3. The electronic heating apparatus set forth in claim 1, wherein said antenna is disposed substantially mdiway between said side walls and is spaced from said rear wall an electrical distance one-fourth the depth of said heating cavity, said tuning means being disposed centrally of said top wall.
4. The electronic heating apparatus set forth in claim 1, wherein said antenna is disposed substantially midway between said side walls and is spaced from said rear wall an electrical distance one-fourth the depth of said heating cavity, said tuning means being disposed substantially midway between said side walls and being spaced from said front wall an electrical distance one-fourth of the depth of said heating cavity.
5. The electronic heating apparatus set forth in claim 1, wherein lambda is approximately equal to 12.9 inches.
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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179595A (en) * 1976-08-19 1979-12-18 Saint-Gobain Industries Multimodal resonant cavity for very high frequency heating
US4476362A (en) * 1975-05-19 1984-10-09 Matsushita Electric Industrial Co., Ltd. High frequency heating apparatus
US4621179A (en) * 1981-08-07 1986-11-04 Matsushita Electric Industrial Co., Ltd. Microwave heating apparatus
US5352873A (en) * 1992-06-10 1994-10-04 Whirlpool Europe B.V. Microwave oven cavity including a grill element
US5828040A (en) * 1995-05-31 1998-10-27 The Rubbright Group, Inc. Rectangular microwave heating applicator with hybrid modes
US5977532A (en) * 1994-03-08 1999-11-02 Antrad System Ab Method and apparatus for using electromagnetic radiation to heat a dielectric material
US6607920B2 (en) 2001-01-31 2003-08-19 Cem Corporation Attenuator system for microwave-assisted chemical synthesis
US6649889B2 (en) 2001-01-31 2003-11-18 Cem Corporation Microwave-assisted chemical synthesis instrument with fixed tuning
US20040101441A1 (en) * 2002-11-26 2004-05-27 Cem Corporation Pressure measurement and relief for microwave-assisted chemical reactions
US20040221654A1 (en) * 2001-01-31 2004-11-11 Jennings William Edward Pressure measurement in microwave-assisted chemical synthesis
US20070068937A1 (en) * 2003-09-02 2007-03-29 Risman Per O Microwave heating applicator
US20090139988A1 (en) * 2007-12-03 2009-06-04 Farnworth Warren M System for creating more uniform distribution of microwave energy in a cavity
US8941039B2 (en) 2010-08-02 2015-01-27 General Electric Company Device and implementation thereof for repairing damage in a cooking appliance

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4476362A (en) * 1975-05-19 1984-10-09 Matsushita Electric Industrial Co., Ltd. High frequency heating apparatus
US4179595A (en) * 1976-08-19 1979-12-18 Saint-Gobain Industries Multimodal resonant cavity for very high frequency heating
US4621179A (en) * 1981-08-07 1986-11-04 Matsushita Electric Industrial Co., Ltd. Microwave heating apparatus
US5352873A (en) * 1992-06-10 1994-10-04 Whirlpool Europe B.V. Microwave oven cavity including a grill element
US5977532A (en) * 1994-03-08 1999-11-02 Antrad System Ab Method and apparatus for using electromagnetic radiation to heat a dielectric material
US5828040A (en) * 1995-05-31 1998-10-27 The Rubbright Group, Inc. Rectangular microwave heating applicator with hybrid modes
US6753517B2 (en) 2001-01-31 2004-06-22 Cem Corporation Microwave-assisted chemical synthesis instrument with fixed tuning
US20050210987A1 (en) * 2001-01-31 2005-09-29 Jennings William E Pressure measurement in microwave-assisted chemical synthesis
US6713739B2 (en) 2001-01-31 2004-03-30 Cem Corporation Microwave-assisted chemical synthesis instrument with fixed tuning
US7208709B2 (en) 2001-01-31 2007-04-24 Cem Corporation Pressure measurement in microwave-assisted chemical synthesis
US6607920B2 (en) 2001-01-31 2003-08-19 Cem Corporation Attenuator system for microwave-assisted chemical synthesis
US20040221654A1 (en) * 2001-01-31 2004-11-11 Jennings William Edward Pressure measurement in microwave-assisted chemical synthesis
US6886408B2 (en) 2001-01-31 2005-05-03 Cem Corporation Pressure measurement in microwave-assisted chemical synthesis
US6649889B2 (en) 2001-01-31 2003-11-18 Cem Corporation Microwave-assisted chemical synthesis instrument with fixed tuning
US6966226B2 (en) 2001-01-31 2005-11-22 Cem Corporation Pressure measurement in microwave-assisted chemical synthesis
US7144739B2 (en) 2002-11-26 2006-12-05 Cem Corporation Pressure measurement and relief for microwave-assisted chemical reactions
US20040101441A1 (en) * 2002-11-26 2004-05-27 Cem Corporation Pressure measurement and relief for microwave-assisted chemical reactions
US20070068937A1 (en) * 2003-09-02 2007-03-29 Risman Per O Microwave heating applicator
US7964828B2 (en) * 2003-09-02 2011-06-21 Exh Llc Microwave heating applicator
US20090139988A1 (en) * 2007-12-03 2009-06-04 Farnworth Warren M System for creating more uniform distribution of microwave energy in a cavity
US8941039B2 (en) 2010-08-02 2015-01-27 General Electric Company Device and implementation thereof for repairing damage in a cooking appliance

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