WO2004010740A1 - Antennes dielectriques concues pour etre utilisees dans des applications de chauffage micro-ondes - Google Patents

Antennes dielectriques concues pour etre utilisees dans des applications de chauffage micro-ondes Download PDF

Info

Publication number
WO2004010740A1
WO2004010740A1 PCT/GB2003/003238 GB0303238W WO2004010740A1 WO 2004010740 A1 WO2004010740 A1 WO 2004010740A1 GB 0303238 W GB0303238 W GB 0303238W WO 2004010740 A1 WO2004010740 A1 WO 2004010740A1
Authority
WO
WIPO (PCT)
Prior art keywords
microwave
dielectric
antenna
heating
dielectric antenna
Prior art date
Application number
PCT/GB2003/003238
Other languages
English (en)
Inventor
Roger Wise
Original Assignee
Antenova Limited
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 Antenova Limited filed Critical Antenova Limited
Priority to AU2003248958A priority Critical patent/AU2003248958A1/en
Publication of WO2004010740A1 publication Critical patent/WO2004010740A1/fr

Links

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
    • H05B6/74—Mode transformers or mode stirrers
    • 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
    • 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
    • H05B6/72—Radiators or antennas
    • 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

  • the present invention relates to dielectric antennas, such as dielectric resontator antennas (DRAs), high dielectric antennas (HDAs) and dielectrically loaded antennas (DLAs) used in heating applications, and in particular to dielectric antennas used as microwave heatin applicators and as induction heating applicators.
  • DAAs dielectric resontator antennas
  • HDAs high dielectric antennas
  • DLAs dielectrically loaded antennas
  • Dielectric resonator antennas are resonant antenna devices that radiate or receive radio waves at a chosen frequency of transmission and reception, as used in for example in mobile telecommunications.
  • a DRA consists of a volume of a dielectric material disposed on or close to a grounded substrate, with energy being transferred to and from the dielectric material by way of monopole probes inserted into the dielectric material or by way of monopole aperture feeds provided in the grounded substrate (an aperture feed is a discontinuity, generally rectangular in shape, although oval, oblong, trapezoidal or butterfly bow tie shapes and combinations of these shapes may also be appropriate, provided in the grounded substrate where this is covered by the dielectric material.
  • the aperture feed may be excited by a strip feed in the form of a microstrip transmission line, coplanar waveguide, slotline or the like which is located on a side of the grounded substrate remote f om the dielectric material). Direct connection to and excitation by a microstrip transmission line is also possible. Alternatively, dipole probes may be inserted into the dielectric material, in which case a grounded substrate is not required. By providing multiple feeds and exciting these sequentially or in various combinations, a continuously or incrementally steerable beam or beams may be formed, as discussed for example in the present applicant's co-pending US patent application serial number US 09/431,548 and the publication by KINGSLEY, S.P.
  • High dielectric antennas are similar to DRAs, but instead of having a full ground plane located under the dielectric pellet, HDAs have a smaller ground plane or no ground plane at all. Removal of the ground plane underneath gives a less well-defined resonance and consequently a very much broader bandwidth. HDAs generally radiate as much power in a backward direction as they do in a forward direction.
  • the primary radiator is the dielectric pellet.
  • the primary radiator is a conductive component (e.g. a metal wire or printed strip or the like), and a dielectric component then just modifies the medium in which the DLA operates and generally allows the antenna as a whole to be made smaller or more compact.
  • a DLA may also be excited or formed by a direct microstrip feedline.
  • a pellet of dielectric material may be placed on or otherwise associated with a microstrip feedline or the like so as to modify radiation properties of the feedline when operating as an antenna.
  • DRAs may take various forms, a common form having a cylindrical shape which may be fed by a metallic probe within the cylinder.
  • Such a cylindrical resonating medium can be made from several candidate materials including ceramic dielectrics. Since the first systematic study of dielectric resonator antennas (DRAs) in 1983 [LONG, S.A., McALLISTER, M.W., and SHEN, L.C.: "The Resonant Cylindrical Dielectric Cavity Antenna", IEEE Transactions on Antennas and Propagation, AP-31, 1983, pp 406-412], interest has grown in their radiation patterns because of their high radiation efficiency, good match to most commonly used transmission lines and small physical size [MONGIA, R.K.
  • Half-split cylinder half a cylinder mounted vertically on a ground plane
  • Microwave heating is a very well known technique for processing a range of materials from food to rubber.
  • a generator of microwave energy (often a magnetron), a transmission system (cable or waveguide) and an energy delivery system.
  • the magnetron supplied microwave energy directly to the energy delivery system without passing through a transmission system.
  • the energy delivery system generally comprises a component that launches the microwave energy and an enclosure into which the microwave energy is launched.
  • the enclosure makes two contributions to the energy delivery system: firstly, the enclosure contains the microwave energy (for safety reasons); secondly, the enclosure acts as a set of walls from which the microwave energy is reflected.
  • an enclosure in the form of a multi-mode cavity for example an interior of a microwave oven.
  • the aim of the energy delivery system in a typical multi-mode heating system is to deliver microwave energy substantially uniformly to an item being heated (e.g. food) so that it heats evenly.
  • Microwave energy is launched into the cavity and reflects between the walls thereof until it is incident on the item being heated at which point the microwave energy is absorbed. A small amount of energy is lost at each reflection, and this energy is dissipated at heat in the walls of the cavity.
  • the aim of producing a uniform pattern of energy is rarely achieved, since some items being heated require different amounts of energy at different parts of their volumes. For example, when cooking a chicken in a microwave oven, the wings and legs of the chicken will require less microwave energy to be absorbed than the body of the chicken, since the wings and legs have a smaller volume and will thus heat up more quickly.
  • Another problem is that it is generally difficult to detect when an item being heated has reached a desired temperature or state (e.g. when food has been sufficiently cooked).
  • a microwave heating device comprised as a dielectric antenna.
  • a method of applying microwave energy wherein microwave energy generated by a microwave generator is supplied to a dielectric antenna and transmitted therefrom.
  • a heating device comprising a microwave generator connected to at least one microwave transmitter in the form of a dielectric antenna.
  • a microwave generator including at least one dielectric antenna adapted to transmit microwave energy from the microwave generator.
  • the energy may be delivered more accurately to an item being heated.
  • the microwave generator may be a magnetron or the like.
  • the microwave generator may include at least one dielectric antenna as an integral component thereof to serve as a microwave launcher.
  • the heating device of the third aspect may include a heating chamber or cavity in the manner of a conventional microwave oven or heater, the at least one dielectric antenna being mounted at a perimetral portion of the chamber.
  • each dielectric antenna being selectively activatable, either alone or in combination with other dielectric antennas, so as to direct microwave radiation to predetermined regions within the heating chamber.
  • the amount of energy supplied to each dielectric antenna by the microwave generator e.g. a magnetron
  • At least one and preferably a plurality of additional dielectric antennas are provided, preferably also at perimetral portions of the chamber, the additional dielectric antennas being configured as sensors to detect reflected or transmitted microwave signals within the chamber.
  • the sensor dielectric antennas together with suitable control circuitry or the like, can help to determine a heating profile within the chamber and thereby assist in controlling the microwave generator and/or the at least one microwave applicator dielectric antenna (e.g. by varying the amount of supplied energy and/or by selectively activating/deactivating one or more microwave applicator dielectric antennas or the microwave generator) so as to meet predetermined heating requirements.
  • the sensor dielectric antennas may also serve as microwave launcher dielectric antennas, or may be adapted only to sense reflected microwave energy.
  • the at least one sensor dielectric antenna can detect when food is cooked because of detectable changes in the sensed signals due to the dielectric properties of the food changing with temperature and degree of cooking.
  • control circuitry it is possible to set a predetermined cooking temperature for a predetermined type of food by way of feedback control via the at least one sensing dielectric antenna.
  • the at least one sensor dielectric antenna can detect if there is nothing inside the heating chamber when microwave energy is applied, and can cause a control signal to be issued to switch off the microwave generator and/or the microwave applicator dielectric antenna so as to prevent damage thereto.
  • the at least one sensor dielectric antenna may also issue control signals to change an angle of at " least one microwave-reflecting surface in a vicinity of the at least one microwave applicator dielectric antenna or a power launcher of the microwave generator, thereby helping to steer or direct microwave energy within the chamber to parts thereof where it is detected that specific heating is required.
  • Control of the reflective surface may be achieved by way of any appropriate means, e.g. servo motors or the like.
  • the at least one microwave applicator dielectric antenna may be configured as a steerable dielectric antenna, i.e. one having a plurality of feeds which are activatable individually or in combination so as to cause a beam of microwave energy to be steered in azimuth and/or elevation within the heating chamber.
  • microwave energy may be directed to where it is needed most, for example towards relatively dense parts of an article being heated.
  • Steering of the microwave applicator dielectric antenna is advantageously achieved by way of feedback control signals from the at least one sensor dielectric antenna.
  • a griddle or the like may be constructed with a plurality of microwave applicator dielectric antennas (e.g. cylindrical DRAs) adapted to heat food or the like placed on the griddle.
  • Both of the steering mechanisms discussed above may be used as an alternative to or in addition to conventional mechanisms such as rotating turntables or mode stirrers (which are generally cumbersome and/or inefficient). In this way, it is possible to achieve substantially uniform energy density throughout an article being heated in the oven (e.g. food being cooked or rubber being vulcanised).
  • Microwave ovens and/or heaters of embodiments of the present invention are also advantageous in that moving parts (e.g. wavestirrers and the like) associated with conventional microwave ovens and/or heaters may be omitted, since even heating of an item within the oven and/or heater may be achieved by selective activation and/or steering of one or more dielectric antennas via solid-state control electronics.
  • moving parts e.g. wavestirrers and the like
  • Microwave radiation like all other types of electromagnetic radiation, comprises a component of magnetic field and a component of electric field.
  • a component of electric field In the case of microwave heating of foodstuffs and the like in a microwave oven, it is generally the electric field component that interacts with water molecules in the food to cause heating.
  • the magnetic field component of the microwave radiation can cause heating in some materials by induction.
  • Materials which will heat in this way include electrical conductors (e.g. metals), ferromagnetic materials and ferrimagnetic materials. The reason that this is not usually done is that some form of magnetic field concentration is preferred for efficient heating. Means to concentrate magnetic fields at microwave frequencies tend to be inefficient e.g. the use of microwave ferrites.
  • Induction heating is traditionally carried out at frequencies between a few kHz and 10MHz because of equipment cost and availability, and skin depth effects. However, for some applications (i.e. those where the skin effect is not important), induction heating at microwave frequencies is feasible. At 2.45 GHz (the frequency of operation of a domestic microwave oven), equipment is available at a relatively low cost.
  • Induction heating at lower frequencies is also generally only applicable to parts exceeding a certain size (about 1 to 1.5cm square). This is because at lower frequencies, the traditional method of introducing the magnetic field to the object to be heated is to use a coil called the workcoil. Workcoils need to be cooled with a supply of water to prevent excessive heating by self-induction due to the high currents being carried in the workcoil. Because part of the power supplied to the workcoil is taken away by the cooling water, the process in this form is inherently inefficient. This approach also means that there is a minimum size that the workcoil can be in order to allow a sufficient flow of water to keep the coil cool (about 1 to 1.5 cm square).
  • a DRA or other dielectric antenna can be used as an induction heating element.
  • This solution is both small and efficient and does not require cooling.
  • the efficiency comes from the fact that the losses in the material are low because of its purity. This means that cooling water is not required.
  • the size is dictated by the shape of the required magnetic field concentration which can be predicted by the electric field pattern. This approach allows heating zones of less than 1 to 1.5cm square to be achieved.
  • the intensification of the magnetic field by the direct intensification of the electric field is as a result of the relationship between the two field strengths.
  • B is about 120 Gauss for 100W. This is sufficient to cause heating at this frequency.
  • DRAs as the dielectric antennas
  • HDAs and DLAs may be used as an alternative to or in combination with DRAs.
  • FIGURE 1 shows a conventional microwave oven
  • FIGURE 2 shows a microwave oven of an embodiment of the present invention
  • FIGURE 3 shows a DRA being used as an induction heater.
  • a conventional microwave oven comprising a multi-mode cavity 1 and a microwave generator in the form of a magnetron 2 having a power supply 3.
  • the magnetron 2 is configured so that microwaves are launched into the cavity 1 via an emitter 4.
  • a rotating metallic mode stirrer 5 is provided close to the emitter 4 so as to mix the microwave modes and to help prevent standing waves and the like.
  • a rotating turntable 6 on which food 7 to be heated is placed. Both the mode stirrer 5 and the turntable 6 are required in order to help reduce "hot spots" in the cavity 1 and the food 7.
  • a multi-mode cavity 1 and a magnetron with a power supply (not shown in Figure 2).
  • Food 7 is located within the cavity 1 for heating.
  • a plurality of dielectric resonator antennas 8 each connected to the magnetron is disposed about a periphery of the cavity 1 and is configured to radiate microwave energy into the cavity 1.
  • a plurality of sensors 9 (which may also be configured as dielectric resonator antennas) disposed about the periphery of the cavity 1, in this case interspersed between the dielectric resonator antennas 8.
  • the sensors 9 can detect reflected or transmitted microwave signals within the cavity 1 and can also determined a heating profile within the cavity 1 (for example to determine when the food 7 has been completely cooked).
  • the DRAs 8 can be controlled so as to achieve a predetermined heating profile or the like by way of active control.
  • at least some of the DRAs 8 are configured as electronically steerable DRAs 8 adapted to direct microwave energy at different regions within the cavity 1. In this way, it is possible to achieve a relatively even heating profile without the need for moving mechanical parts such as the mode stirrer 5 or the turntable 6 of the conventional oven of Figure 1, thereby helping to improve reliability.
  • FIG. 3 shows a DRA 30 comprising a quarter-split cylindrical dielectric ceramics pellet 31 mounted on a substrate 32 incorporating an appropriate feed mechanism (not shown).
  • the DRA 30 is being used to heat a ferro- or ferrimagnetic article 33 by induction, using the magnetic component of a microwave signal radiated by the DRA 30 in response to an appropriate signal being supplied by the feed mechanism.

Abstract

La présente invention se rapporte à un dispositif de chauffage micro-ondes (1) dans lequel l'énergie des micro-ondes provenant d'un magnétron (2) est dirigée vers l'intérieur d'une cavité multi-mode par l'intermédiaire d'une ou de plusieurs antennes de résonateurs diélectriques (8) disposées à la périphérie de la cavité. Des capteurs micro-ondes supplémentaires (9), qui peuvent également être conçus comme des antennes de résonateurs diélectriques (8), peuvent également être disposés à la périphérie. L'utilisation de circuits de commande et de rétroaction appropriés permet le chauffage d'aliments (7) ou d'autres éléments dans la cavité conformément à un profil de chauffage préétabli et sans recours à aucun répartiteur d'ondes ni à aucune partie mobile.
PCT/GB2003/003238 2002-07-22 2003-07-21 Antennes dielectriques concues pour etre utilisees dans des applications de chauffage micro-ondes WO2004010740A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003248958A AU2003248958A1 (en) 2002-07-22 2003-07-21 Dielectric antennas for use in microwave heating applications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0216936A GB2391154A (en) 2002-07-22 2002-07-22 Dielectric resonator antennas for use as microwave heating applicators
GB0216936.5 2002-07-22

Publications (1)

Publication Number Publication Date
WO2004010740A1 true WO2004010740A1 (fr) 2004-01-29

Family

ID=9940867

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/003238 WO2004010740A1 (fr) 2002-07-22 2003-07-21 Antennes dielectriques concues pour etre utilisees dans des applications de chauffage micro-ondes

Country Status (3)

Country Link
AU (1) AU2003248958A1 (fr)
GB (1) GB2391154A (fr)
WO (1) WO2004010740A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2544508B1 (fr) 2006-07-10 2015-06-17 Goji Limited Procédé pour chauffer des aliments
US9131543B2 (en) 2007-08-30 2015-09-08 Goji Limited Dynamic impedance matching in RF resonator cavity
EP2446706B1 (fr) 2010-05-03 2016-01-27 Goji Limited Analyse modale
EP2528413B1 (fr) 2006-02-21 2016-05-11 Goji Limited Chauffage électromagnétique
EP2914062B1 (fr) 2010-05-03 2016-12-07 Goji Limited Apport d'énergie régulé spatialement
US10088436B2 (en) 2011-08-31 2018-10-02 Goji Ltd. Object processing state sensing using RF radiation
US10492247B2 (en) 2006-02-21 2019-11-26 Goji Limited Food preparation
US10531526B2 (en) 2016-06-30 2020-01-07 Nxp Usa, Inc. Solid state microwave heating apparatus with dielectric resonator antenna array, and methods of operation and manufacture
US10638559B2 (en) 2016-06-30 2020-04-28 Nxp Usa, Inc. Solid state microwave heating apparatus and method with stacked dielectric resonator antenna array
US10674570B2 (en) 2006-02-21 2020-06-02 Goji Limited System and method for applying electromagnetic energy

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8839527B2 (en) 2006-02-21 2014-09-23 Goji Limited Drying apparatus and methods and accessories for use therewith
US20120122072A1 (en) 2008-11-10 2012-05-17 Rf Dynamics Ltd. Method and system for heating and/or thawing blood products
US9992824B2 (en) * 2010-10-29 2018-06-05 Goji Limited Time estimation for energy application in an RF energy transfer device
CN108767439A (zh) * 2018-05-25 2018-11-06 上海点为智能科技有限责任公司 受限空间内的双天线补偿加热装置
CN108598658A (zh) * 2018-05-25 2018-09-28 上海点为智能科技有限责任公司 受限空间内的三天线补偿加热装置

Citations (6)

* 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
US4596915A (en) * 1985-05-07 1986-06-24 Amana Refrigeration, Inc. Microwave oven having resonant antenna
JPS62222595A (ja) * 1986-03-24 1987-09-30 チエスト株式会社 マイクロ波加温装置
JPH04188592A (ja) * 1990-11-20 1992-07-07 Sharp Corp 電子レンジ
FR2815512A1 (fr) * 2000-10-18 2002-04-19 Moulinex Sa Dispositif de chauffage d'un materiau par application de micro-ondes
US6452141B1 (en) * 2001-06-30 2002-09-17 Samsung Electronics Co., Ltd. Microwave oven with magnetic field detecting device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446349A (en) * 1983-01-03 1984-05-01 General Electric Company Microwave phase shifting device

Patent Citations (6)

* 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
US4596915A (en) * 1985-05-07 1986-06-24 Amana Refrigeration, Inc. Microwave oven having resonant antenna
JPS62222595A (ja) * 1986-03-24 1987-09-30 チエスト株式会社 マイクロ波加温装置
JPH04188592A (ja) * 1990-11-20 1992-07-07 Sharp Corp 電子レンジ
FR2815512A1 (fr) * 2000-10-18 2002-04-19 Moulinex Sa Dispositif de chauffage d'un materiau par application de micro-ondes
US6452141B1 (en) * 2001-06-30 2002-09-17 Samsung Electronics Co., Ltd. Microwave oven with magnetic field detecting device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ Week 198745, 30 September 1987 Derwent World Patents Index; Class P34, AN 1987-316109, XP002258099, CHESUTO KK: "Microwave heating apparatus for medical treatment of cancer - has microwave oscillator, waveguide connected to oscillator, and pyramid-shaped dielectric antenna" *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 505 (E - 1281) 19 October 1992 (1992-10-19) *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10492247B2 (en) 2006-02-21 2019-11-26 Goji Limited Food preparation
US11729871B2 (en) 2006-02-21 2023-08-15 Joliet 2010 Limited System and method for applying electromagnetic energy
EP2528413B1 (fr) 2006-02-21 2016-05-11 Goji Limited Chauffage électromagnétique
US11523474B2 (en) 2006-02-21 2022-12-06 Goji Limited Electromagnetic heating
US10674570B2 (en) 2006-02-21 2020-06-02 Goji Limited System and method for applying electromagnetic energy
EP2544508B1 (fr) 2006-07-10 2015-06-17 Goji Limited Procédé pour chauffer des aliments
US9131543B2 (en) 2007-08-30 2015-09-08 Goji Limited Dynamic impedance matching in RF resonator cavity
US11129245B2 (en) 2007-08-30 2021-09-21 Goji Limited Dynamic impedance matching in RF resonator cavity
EP2914062B1 (fr) 2010-05-03 2016-12-07 Goji Limited Apport d'énergie régulé spatialement
US10425999B2 (en) 2010-05-03 2019-09-24 Goji Limited Modal analysis
EP2916619B1 (fr) 2010-05-03 2016-12-14 Goji Limited Analyse modale
EP2446706B1 (fr) 2010-05-03 2016-01-27 Goji Limited Analyse modale
US11009468B2 (en) 2011-08-31 2021-05-18 Goji Limited Object processing state sensing using RF radiation
US10088436B2 (en) 2011-08-31 2018-10-02 Goji Ltd. Object processing state sensing using RF radiation
EP3503680B1 (fr) 2011-08-31 2022-01-19 Goji Limited Détection de l'état d'un traitement d'objets à l'aide d'un rayonnement rf
US10531526B2 (en) 2016-06-30 2020-01-07 Nxp Usa, Inc. Solid state microwave heating apparatus with dielectric resonator antenna array, and methods of operation and manufacture
US10638559B2 (en) 2016-06-30 2020-04-28 Nxp Usa, Inc. Solid state microwave heating apparatus and method with stacked dielectric resonator antenna array

Also Published As

Publication number Publication date
GB0216936D0 (en) 2002-08-28
GB2391154A (en) 2004-01-28
AU2003248958A1 (en) 2004-02-09

Similar Documents

Publication Publication Date Title
US11102852B2 (en) Apparatus and method for sensing and processing by RF
WO2004010740A1 (fr) Antennes dielectriques concues pour etre utilisees dans des applications de chauffage micro-ondes
US4336434A (en) Microwave oven cavity excitation system employing circularly polarized beam steering for uniformity of energy distribution and improved impedance matching
EP2205043B1 (fr) Appareil de chauffage par micro-ondes
JP5648028B2 (ja) 電磁加熱
US8922969B2 (en) Ferrite-induced spatial modification of EM field patterns
US5990466A (en) Apparatus for supplying microwave energy to a cavity
CN108567111B (zh) 烹调至少一个食品的系统
CN108702819B (zh) 具有反射能量调向的电烤箱
US4324968A (en) Microwave oven cavity excitation system providing controlled electric field shape for uniformity of energy distribution
JP6923109B1 (ja) 加熱用電磁波制御体及び加熱用電磁波制御体付き物品
KR101765837B1 (ko) 솔리드 스테이트 해동 시스템
CN111720865B (zh) 具有再辐射器的rf加热设备
KR101971668B1 (ko) 선택적 가열이 가능한 저주파 대역 히팅 안테나 및 이를 이용한 오븐
JPH08124672A (ja) 高周波加熱装置
EP3852496A1 (fr) Appareil de traitement par micro-ondes
JPH11135251A (ja) 電子レンジ
CA1175109A (fr) Systeme d'excitation de la cavite d'un four a micro-ondes donnant un champ electrique controle pour uniformiser la distribution d'energie
Hand Physical techniques for delivering microwave energy to tissues.
KR101765836B1 (ko) 솔리드 스테이트 쿠킹 시스템
WO2024095425A1 (fr) Dispositif d'irradiation par micro-ondes
JPH0728714Y2 (ja) 誘電加熱装置
JPH0917569A (ja) マイクロ波食品解凍加熱装置及び食品自動販売機
JP2000150137A (ja) マイクロ波加熱装置
JPH113775A (ja) 高周波加熱装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP