EP1241923B1 - Mikrowellenherd - Google Patents

Mikrowellenherd Download PDF

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Publication number
EP1241923B1
EP1241923B1 EP02356051A EP02356051A EP1241923B1 EP 1241923 B1 EP1241923 B1 EP 1241923B1 EP 02356051 A EP02356051 A EP 02356051A EP 02356051 A EP02356051 A EP 02356051A EP 1241923 B1 EP1241923 B1 EP 1241923B1
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EP
European Patent Office
Prior art keywords
antenna
microwave oven
waveguide
oven according
microwave
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
EP02356051A
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English (en)
French (fr)
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EP1241923A1 (de
Inventor
Michel Le Roy
Jean-Paul Morizot
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.)
SEB SA
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SEB SA
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Publication date
Application filed by SEB SA filed Critical SEB SA
Publication of EP1241923A1 publication Critical patent/EP1241923A1/de
Application granted granted Critical
Publication of EP1241923B1 publication Critical patent/EP1241923B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H05B6/707—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
    • H05B6/70—Feed lines
    • H05B6/702—Feed lines using coaxial cables
    • 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

Definitions

  • the present invention relates to a heating oven by microwave comprising a microwave generator diffusing microwave energy in a waveguide and controlled by means of programming the operation of the oven, said waveguide emerging in a heating enclosure delimited by a door and by a wall comprising at least one arch and one sole.
  • Heating ovens of this type collide with problem of energy intensity distribution microwave in the heating enclosure. Indeed it is difficult to obtain a homogeneous distribution of energy microwave.
  • the microwave reflections on the wall cause the presence of standing waves with areas where the intensity of microwave energy is weak, and therefore the heating is weak important.
  • a first solution to overcome this problem consists in placing a stirrer called “stirrer” in the microwave field.
  • a classic stirrer has a rotating propeller whose blades move and randomly reflect the waves in the oven cavity.
  • Another commonly used solution of nowadays involves placing the food on a platter rotatable so that it successively crosses low and high energy microwave areas.
  • the object of the present invention is to remedy these disadvantages by improving the distribution of microwave energy in the heating enclosure.
  • a additional objective of the invention is to be able change the distribution of microwave energy into depending on the type of food to be cooked or defrosted.
  • the oven comprises at least one collecting antenna arranged in the waveguide so as to pick up a part of the microwaves diffused in said waveguide, and at least one transmitting antenna adapted to emit micro- waves arranged in the heating enclosure, said collecting and transmitting antennas being connected by an electromagnetic propagation line of length L.
  • the collecting antenna makes it possible to take a part of the microwave energy generated by the oven for broadcast this energy from the transmitting antenna in a specific area of the heating enclosure.
  • the transmitting antenna arranged near an area where the waveguide does not allow to obtain sufficient microwave energy, allows increase the energy density in this area and improve the general distribution of microwaves in the enclosure.
  • the transmitting antenna is an antenna of the plate type with a suitable geometric shape emitting a polarized electromagnetic field circular.
  • This type of antenna transmits in one precise point, a microwave energy field animated by a rotating movement which ensures more uniform heating than a stationary field.
  • phase shift, at a given point of the enclosure, between the microwaves coming from the waveguide and those coming from the transmitting antenna depends on the length L of the propagation line.
  • this length L is calculated so as to obtain at this point of the enclosure, called focal point, a constructive superposition of the microwaves which makes it possible to intensify the heating power.
  • the length of the propagation line is variable between the length L and a length L + ⁇ L by means of an actuator. Thanks to this arrangement, the focus point can be placed in different positions depending on the nature or shape of the food to be cooked, but the focus point can also be moved continuously during a heating program so as to sweep the entire volume of the food.
  • the collecting antenna can be moved in the guide waves thanks to an actuator so as to pick up a more or less amount of microwave energy. So we can adjust the intensity of microwave energy radiated by the transmitting antenna depending on the type of heating to be carried out or type of food. Through example we can go from a homogeneous distribution particularly suitable for cooking vegetables, at a distribution with a peak in heating power applied to the center of the food which is more effective to carry out a defrosting operation.
  • the microwave heating includes a generator microwave 1 diffusing microwave energy into a waveguide 2 and controlled by means of programming 3 for oven operation.
  • Guide of waves 2 opens into a heating enclosure 4 of general parallelepiped shape delimited by a door not shown, and by a wall 5 comprising at least a vault 6 and a sole 7.
  • the outlet of the waveguide 2 is protected by a plate 8 transparent to microwaves.
  • a magnetron connected to a power supply 9.
  • the magnetron 1 delivers in the waveguide 2 a 900 W power at a frequency of 2.45 GHz. All of these elements are housed in a casing 10 which forms the housing of the device.
  • a collecting antenna 11 is arranged in the waveguide 2 so as to pick up part of the microwave energy scattered in said waveguide, a transmitting antenna 12 adapted to emit microwaves is arranged in the heating enclosure 4, said collecting and transmitting antennas being connected by an electromagnetic propagation line 13 of length L.
  • This arrangement makes it possible to take a part of the microwave energy produced to diffuse it in a chosen area of the enclosure 4 and determined by the position of the transmitting antenna 12.
  • the transmitting antenna 12 can be arranged in any region of the heating cabinet 4. But to achieve a homogeneous distribution of energy microwave, the antenna is placed near a region where the energy diffused by the guide outlet wave 2 is lower. Generally in microwave ovens this is in the central area of enclosure 4 that the microwave energy is lower, and especially in the lower part of the central area if the waveguide opens near the arch 6. It is therefore a good idea to place the transmitting antenna in the central region of sole 7.
  • a plate type antenna called "patch antenna "in English.
  • This type of antenna includes usually one or more radiating plates 15 substantially flat, of conductive material, arranged parallel to a conductive surface connected to the mass, called the ground plane.
  • the insulation between the plate radiant, forming the antenna proper, and the plane mass can be realized by a dielectric material or air.
  • the main dimensions of the antenna depend on the wavelength ⁇ of the microwaves emitted and are generally between ⁇ / 4 and ⁇ .
  • the shape of the antenna plate serving as antenna transmitter 12 can be rectangular but it's particularly advantageous to use an antenna with a radiating plate 15 of geometric shape adapted to emit a polarized electromagnetic field circular.
  • a radiating plate 15 of geometric shape adapted to emit a polarized electromagnetic field circular.
  • plate antennas to obtain such a field. These antennas are in general characterized by longitudinal dimensions and substantially equal in cross-section, as shown by Figures 2a and 2b showing two forms of antenna 15.15 'circular polarization.
  • the first form antenna 15 shown in Figure 2a is square with two opposite corners cut 16,17.
  • the second form antenna 15 'shown in Figure 2b is circular with two rectangular notches 16 ', 17' diametrically opposed.
  • the field created by this type of antenna performs a rotational movement about an axis perpendicular to the antenna plate which allows a good distribution microwave energy in the work area. So, it is possible to make a microwave oven without turntable.
  • the transmitting antenna 12 is separated from the area of heating by a protection 18 transparent to microwaves, such as a glass plate arranged parallel to the sole 7. This protects the shock antenna 12 and facilitates cleaning of the heating chamber 4, in particular when the oven is an oven for domestic use.
  • the wall 5 of the heating enclosure is connected to an electrical ground to prevent microwave leakage.
  • We can shoot advantage of this characteristic by using a portion 19 of the wall 5 to constitute the ground plane of the plate antenna 12. This arrangement minimizes the size of the antenna in the enclosure and. reduces manufacturing costs.
  • the radiating plate 15 of the transmitting antenna 12 can be isolated from the portion 19 of the wall forming the ground plane, by an interposed dielectric material such as PTFE. But according to a preferred embodiment the radiating plate 15 of the antenna 12 is held parallel to a distance d from the wall 19 by a conductive support 20 extending from an electromagnetically neutral point 21 of the radiating plate 15 to the wall 19. This electromagnetically neutral point generally corresponds to the geometric center of the antenna as shown by references 21 and 21 'in Figures 2a and 2b. The distance d is chosen so as to obtain a good adaptation in impedance of the antenna.
  • the insulation between the radiating plate 15 thus arranged and the part of the wall 19 constituting the ground plane is provided by air which does not present the problems of aging of the polymer materials.
  • the use of a conductive support 20 simplifies the assembly which can be carried out by a welding point between the plate and the support, and between the support and the sole.
  • the electromagnetic propagation line 13 comprises, in known manner, a conductor disposed at proximity to a surface connected to an electrical ground, the conductor and ground generally being isolated by a dielectric material.
  • a line is used coaxial comprising a conductor 25 surrounded by a circular peripheral shield 26, said conductor 25 being connected to the collecting antenna 11 and to the antenna transmitter 12.
  • the connection to transmitter 12 is produced by connecting the conductor 25 to an eccentric point (27,27 ') of the radiating plate 15.
  • a coaxial line is used comprising an outer shield of tinned aluminum 3.58 mm diameter with PTFE insulation. This line has a small footprint and good ability to the deformation which allow to integrate it easily in the structure of a microwave oven.
  • the power transmissible by such a line is 350 W, which is sufficient for an oven type application of microwave cooking for household use.
  • the microwaves coming from the waveguide 2 and the microwaves emitted by the transmitting antenna 12 are superimposed in the heating enclosure 4 with a certain phase shift.
  • This phase shift at a determined point of the enclosure, depends on the difference between the electromagnetic distance traveled by the microwaves emitted by the waveguide 2 and the electromagnetic distance traveled by the microwaves emitted by the transmitting antenna. 12 from the generator 1.
  • the length L of the propagation line 13 is calculated so as to obtain, at a point 29 of the enclosure, called the focal point, a constructive superposition of the microwaves diffused by the guide waves 2 and microwaves emitted by the transmitting antenna 12. This makes it possible to obtain at the focal point 29 a heating energy equal to the sum of the microwave energies coming from the waveguide and from the transmitting antenna .
  • the length L can be determined so that the focal point 29 of the antenna is located in a known area of the enclosure which normally receives little microwave energy.
  • the focal point 29 can also be chosen so as to obtain a heating peak in a particular zone of the enclosure. For example, to defrost a food it is particularly advantageous to obtain a heating peak in the center of the food generally placed on a dish supported by the plate 18.
  • the propagation line 13 comprises a device making it possible to vary the length of said line between the length L and a length L + ⁇ L .
  • the focus point 29 can be moved along an axis perpendicular to the plate 15 of the antenna depending on the type of heating to be carried out or the shape of the food. For example to defrost a roast of meat, it is preferable that the focal point 29 is located a few centimeters above the protective plate 18. While for baking a pizza, it is preferable to lower the focal point so that it is located in the thickness of the dough.
  • FIG. 3 represents such a device inserted on the coaxial propagation line 13 between the collecting antenna and the transmitting antenna.
  • the two ends (30,31) of the conductor 25 of the propagation line 13 are curved inside a metal housing 32 connected to the peripheral shielding 26 of the coaxial line, so as to be arranged in parallel.
  • a U-shaped conductive part 33 comprising in each of its branches a bore (34,35), is arranged so as to be able to slide along the ends (30,31) while ensuring electrical contact between the conductors.
  • An electromechanical linear actuator 36 located outside of the housing 32, comprises a control rod 37 which makes it possible to move the part the U-shaped part 33.
  • the control rod 37 is made of dielectric material and transparent to microwaves.
  • the displacement of the U- shaped part with a length ⁇ L / 2 of makes it possible to vary the length of the propagation line 13 by ⁇ L . But of course, the length variation device can be produced differently without departing from the scope of the invention.
  • the electromechanical actuator 36 can be connected to the programming means 3 of the oven so that the variation in length of the propagation line 13 is automatic.
  • the programming means 3 of the oven then comprise means for controlling the device for varying the length of the propagation line and means for storing different lengths of the propagation line adapted to the running of different heating programs.
  • the programming means 3 of the oven automatically modify the length L of the propagation line 13.
  • the length L can remain constant during a cooking program, but it can also vary continuously or cyclically, either so that the focal point scans the entire volume of the food, or to take account of changes in the dielectric properties of the food during heating.
  • the collecting antenna 11 arranged in the waveguide 2 can be produced in different forms adapted to capture part of the microwave energy and to transmit this energy to the propagation line 13.
  • the collecting antenna 11 comprises a conductive rod 40 disposed substantially perpendicular to the interior wall of the waveguide 2 and has an apparent height h in the waveguide.
  • the conductive rod 40 can be constituted by the extension of the conductor 25 of the coaxial line 13.
  • the power picked up by the antenna 11 depends on the apparent height h . For example, a rod with a height of 22 mm, placed in the middle of one of the interior faces of the waveguide, makes it possible to collect a power of 150 W.
  • the collecting antenna 11 comprises an actuator making it possible to modify the apparent height h of the collecting antenna in the waveguide 2 so as to capture a quantity of microwave energy more or less important.
  • a collecting antenna 11 of variable height can be produced in a simple manner, as shown in FIG. 4.
  • the antenna 11 comprises a hollow metal cylinder 41 adapted to slide along the rod 40 of the antenna while ensuring electrical contact therewith.
  • An electromechanical linear actuator 42 located outside the waveguide 2 comprises a control rod 43 made of dielectric material and transparent to microwaves which makes it possible to move the hollow cylinder 41 along the rod 40 and thus varies the apparent height h of the collecting antenna 11.
  • the height h of the collecting antenna can vary from a height of 20 mm allowing to pick up a power of 100 W, to a height of 25 mm allowing to capture a power of 200 W.
  • the actuator 42 is connected to the programming means 3 of the oven for the purpose of automatically controlling the power picked up by the collecting antenna 11.
  • the programming means 3 of the oven then comprise means for controlling said actuator and means for memorizing the different heights h of the collecting antenna adapted to the progress of the different heating programs.
  • the microwave energy scattered by the transmitting antenna is automatically adjusted according to the heating program selected by the user. For example, if the user chooses a defrosting program, the programming means increase the height h to the maximum in order to obtain a higher heating intensity in the center of the food. While for a vegetable cooking program, the programming means reduce the height h in order to obtain the most homogeneous distribution of microwave energy possible.
  • the invention provides a solution to the problem of "cold zones" created by standing waves in the heating chamber of previous microwave ovens.
  • it allows automatic modification, importantly and precisely, the distribution of microwave energy, based on information user data on the type of cooking effect, the form or nature of the food.
  • each transmitting antenna can be connected to a collecting antenna by a line of electromagnetic propagation, but we can also use a collecting antenna connected to a line of propagation with ramifications connected to transmitting antennas.

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

Claims (14)

  1. Mikrowellenherd umfassend einen Mikrowellengenerator (1), der die Mikrowellenenergie in einen Wellenleiter (2) verteilt und durch Mittel (3) zur Programmierung des Betriebs des Herdes gesteuert wird, wobei der Wellenleiter (2) in einen Heizraum (4) mündet, der durch eine Tür und eine Wand (5) begrenzt ist, die mindestens ein Dachteil (6) und einen Boden (7) aufweist, dadurch gekennzeichnet, dass mindestens eine Sammelantenne (11) im Wellenleiter (2) so angeordnet ist, dass sie einen Teil der im Wellenleiter verteilten Mikrowellenenergie empfängt, und dass mindestens eine Sendeantenne (12), die angepasst ist, um Mikrowellen auszusenden, im Heizraum (4) angeordnet ist, wobei die Sammelantenne und die Sendeantenne durch eine elektromagnetische Übertragungsleitung (13) der Länge L verbunden sind.
  2. Mikrowellenherd nach Anspruch 1, dadurch gekennzeichnet, dass die Sendeantenne (12) eine Antenne vom Typ Scheibenantenne ist.
  3. Mikrowellenherd nach Anspruch 2, dadurch gekennzeichnet, dass die Sendeantenne (12) eine abstrahlende Scheibe (15) in geometrischer Form besitzt, die angepasst ist, um ein elektromagnetisches Feld mit Kreispolarisierung auszusenden.
  4. Mikrowellenherd nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Sendeantenne (12) im mittleren Bereich des Bodens (7) angeordnet ist.
  5. Mikrowellenherd nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass die Sendeantenne (12) durch einen mikrowellendurchlässigen Schutz (18) von der Heizzone getrennt ist.
  6. Mikrowellenherd nach einem der Ansprüche 2 bis 5, dessen Wand (5) des Raumes (4) mit einer elektrischen Masse verbunden ist, dadurch gekennzeichnet, dass die Masseebene der Sendeantenne (12) aus einem Abschnitt (19) der Wand des Raumes (4) besteht.
  7. Mikrowellenherd nach Anspruch 6, dadurch gekennzeichnet, dass die abstrahlende Scheibe (15) der Sendeantenne (12) durch einen leitenden Träger (20), der sich von einem elektromagnetisch neutralen Punkt (21) der abstrahlenden Scheibe (15) zur Wand (19) erstreckt, in einem Abstand d parallel zum Abschnitt (19) der Wand gehalten wird.
  8. Mikrowellenherd nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die elektromagnetische Übertragungsleitung (13) eine koaxiale Leitung ist, die einen Leiter (25) aufweist, welcher von einer Umfangsabschirmung (26) umschlossen ist, wobei der Leiter (25) an die Sammelantenne (11) und an die Sendeantenne (12) angeschlossen ist.
  9. Mikrowellenherd nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Länge L der Übertragungsleitung (13) so berechnet wird, dass in einem Punkt des Raumes (29), der Fokussierungspunkt genannt wird, eine konstruktive Überlagerung der von dem Wellenleiter (2) verteilten Mikrowellen und der von der Sendeantenne (12) ausgesendeten Mikrowellen erhalten wird.
  10. Mikrowellenherd nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Übertragungsleitung (13) eine Vorrichtung aufweist, die es ermöglicht, die Länge der Leitung zwischen der Länge L und einer Länge L+ΔL variieren zu lassen.
  11. Mikrowellenherd nach Anspruch 10, dadurch gekennzeichnet, dass die Programmierungsmittel (3) des Herdes Mittel zum Steuern der Vorrichtung, welche die Länge der Übertragungsleitung (13) variiert, und Mittel zum Speichern verschiedener Längen der Übertragungsleitung, welche an den Ablauf verschiedener Heizprogramme angepasst sind, aufweisen.
  12. Mikrowellenherd nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Sammelantenne (11) einen Leitstab (40) aufweist, der im Wesentlichen senkrecht zur Innenwand des Wellenleiters (2) angebracht ist und eine scheinbare Höhe h im Wellenleiter aufweist.
  13. Mikrowellenherd nach Anspruch 12, dadurch gekennzeichnet, dass die Sammelantenne (11) eine Betätigungsvorrichtung aufweist, mit der die scheinbare Höhe h der Sammelantenne im Wellenleiter verändert werden kann.
  14. Mikrowellenherd nach Anspruch 13, dadurch gekennzeichnet, dass die Programmierungsmittel (3) des Herdes Mittel zum Steuern der Betätigungsvorrichtung und Mittel zum Speichern der verschiedenen Höhen h der Sammelantenne, die an den Ablauf der verschiedenen Heizprogramme angepasst sind, aufweisen.
EP02356051A 2001-03-13 2002-03-13 Mikrowellenherd Expired - Lifetime EP1241923B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0103426A FR2822337B1 (fr) 2001-03-13 2001-03-13 Four de chauffage par micro-ondes
FR0103426 2001-03-13

Publications (2)

Publication Number Publication Date
EP1241923A1 EP1241923A1 (de) 2002-09-18
EP1241923B1 true EP1241923B1 (de) 2004-07-07

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EP02356051A Expired - Lifetime EP1241923B1 (de) 2001-03-13 2002-03-13 Mikrowellenherd

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EP (1) EP1241923B1 (de)
AT (1) ATE270813T1 (de)
DE (1) DE60200699D1 (de)
ES (1) ES2222439T3 (de)
FR (1) FR2822337B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8941040B2 (en) 2006-02-21 2015-01-27 Goji Limited Electromagnetic heating

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006007734B3 (de) * 2006-02-20 2007-10-25 Topinox Sarl Mikrowellenantennenstruktur für ein Gargerät und Gargerät mit solch einer Mikrowellenantennenstruktur
US10674570B2 (en) 2006-02-21 2020-06-02 Goji Limited System and method for applying electromagnetic energy
US8653482B2 (en) 2006-02-21 2014-02-18 Goji Limited RF controlled freezing
DE102007035357B4 (de) 2007-07-27 2012-08-30 Rational Ag Antennenstruktur für ein Gargerät und Gargerät mit solch einer Antennenstruktur
DE102007035359B4 (de) * 2007-07-27 2012-09-20 Rational Ag Kopplungsvorrichtung zur Mikrowellenübertragung in einem Nahrungsmittelbehandlungsgerät
EP2187702A1 (de) 2008-11-17 2010-05-19 Topinox Sarl Gargerät mit Mikrowellenheizung
EP3177109A1 (de) * 2015-12-04 2017-06-07 Electrolux Appliances Aktiebolag Mikrowellenofen
CN113300097A (zh) * 2021-05-12 2021-08-24 北京梦之墨科技有限公司 一种通讯玻璃、箱式结构的门体及微波炉
CN116033611A (zh) * 2021-10-25 2023-04-28 青岛海尔电冰箱有限公司 加热装置
CN116033613A (zh) * 2021-10-25 2023-04-28 青岛海尔电冰箱有限公司 加热装置
DE102022109511A1 (de) * 2022-04-20 2023-10-26 Muegge Gmbh Vorrichtung zum Zuführen von Mikrowellen in einen Behandlungsraum

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Publication number Priority date Publication date Assignee Title
JPH04188592A (ja) * 1990-11-20 1992-07-07 Sharp Corp 電子レンジ
KR950016447A (ko) * 1993-11-15 1995-06-17 사토 후미오 고주파 가열장치 및 그 제어방법
US6175104B1 (en) * 1998-09-04 2001-01-16 Cem Corporation Microwave probe applicator for physical and chemical processes
JP2000133433A (ja) * 1998-10-29 2000-05-12 Sharp Corp 高周波加熱装置
FR2815512B1 (fr) * 2000-10-18 2008-06-06 Moulinex Sa Dispositif de chauffage d'un materiau par application de micro-ondes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8941040B2 (en) 2006-02-21 2015-01-27 Goji Limited Electromagnetic heating

Also Published As

Publication number Publication date
FR2822337B1 (fr) 2003-10-17
ATE270813T1 (de) 2004-07-15
EP1241923A1 (de) 2002-09-18
ES2222439T3 (es) 2005-02-01
DE60200699D1 (de) 2004-08-12
FR2822337A1 (fr) 2002-09-20

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