Abstract: The present invention relates to a microwave oven including a cavity having a certain area for cooking, a magnetron installed at the outside of the cavity for generating microwave, a waveguide installed at the side of the magnetron and its end extended inside of the cavity for transmitting the microwave inside of the cavity. The microwave oven comprises a bidirectional flow channel formed inside of the waveguide for transmitting microwave selectively inside of the cavity in accordance with cooking function, a microwave plate combined to inside of the waveguide so as to be rotational for guiding the microwave to selected direction between the two direction of the flow channel, and a plasma lamp installed adjacent to the side of the bidirectional flow channel for generating radiant energy by being heated by the microwave.

Abstract: A source provides an electromagnetic wave that has a range of frequencies. The source sweeps the frequency of the electromagnetic wave between a cutoff frequency and double the cutoff frequency. The location, angle, or effective angle of an opening is adjusted by an opening adjuster. A path for an electromagnetic wave has a short for creating a standing wave. The path has a movable surface that can push and pull the peaks and valleys of the standing wave so as to achieve more uniform heating of the material. A dielectric wheel pushes and pulls the peaks and valleys of a standing wave so as to achieve more uniform heating of a material. A dielectric structure has a surface that has a short side and a long side. A motor rotates the dielectric structure to push and pull the peaks and valleys of a standing wave so as to achieve more uniform heating of a material. A path has a first choke flange that has a width w1 and a second choke flange that has a width w2.

Abstract: A path for a material passes through an opening and along a segment through an off-peak region of an electric field. An E-plane bend delivers an electromagnetic wave to the segment. A standing wave is used to heat the material. The peaks or valleys are pushed or pulled by a movable surface or by changing the frequency of the electromagnetic wave. A rectangular choke flange is used at the opening to the segment. A curved segment connects the segment to another segment for heating the material. According to another aspect of the invention, a segment is used to heat just the edge of a planar material.

Abstract: A feed that provides circularly polarized microwave energy such as for energizing a microwave oven cavity. The feed includes a transformer to match a linearly polarized rectangular waveguide to a polarization waveguide section which may be circular or square in cross section. The polarization waveguide section contains an asymmetrical element that provides symmetry about a plane only. The asymmetrical element therefore introduces a difference in microwave electrical phase for polarizations which are respectively parallel to and perpendicular to the symmetry plane. A second waveguide section having a bend is also used in the feed assembly. The second waveguide section, which may for example be a bent section of circular waveguide, also presents an electromagnetic symmetry about a plane only. As a result, the two waveguide sections operating together provide circularly polarized energy at constant magnitude but continually rotating phase.

Abstract: A high frequency heating apparatus for heating an object to be heated is provided with an electromagnetic wave emission device for emitting electromagnetic waves, a local heating device capable of heating an optional portion of the object by the electromagnetic waves emitted from the emission device, and a control device for controlling the local heating device. The high frequency heating apparatus is further provided with a stage on which the object is placed, a protecting device for protecting the local heating device, a setting device and a detection device, so that the local heating device, the electromagnetic wave emission device or the stage is controlled in accordance with the setting device or detection device.

Abstract: A method and apparatus for the removing solvents from coated materials while capturing evaporated vapors in a confined space and maintaining non-explosive conditions within the space. Microwave energy may be applied to a coated material as the coated material passes through a cavity configured to produce an electromagnetic resonance mode. The application of microwaves to the coated material causes rapid evaporation of the solvents. The cavity is also configured to confine the evaporated vapors in a small volume and control the inflow of air into the volume so as to produce an effluent waste stream which includes a relatively high concentration of solvent molecules while maintaining a non-explosive atmosphere within the cavity. The method and apparatus are particularly suited for treating coated web materials, especially continuous webs.

Abstract: A technique for passive suppression of arcs within a microwave frequency waveguide section. The waveguide is configured to have a bend at a point where the naturally, relatively high location occurs within the run. The bend at the high point causes arcs to be trapped as heat naturally collects within the waveguide at such predictable locations. Vent holes formed in the exterior portion of the waveguide at this point allow trapped hot air gases to escape, and cause the arc to be drawn towards the sidewall of the waveguide at a point where the voltage approaches zero. Presenting this region of zero voltage to the arc causes the arc to extinguish itself.

Abstract: A source provides an electromagnetic wave that has a range of frequencies. The source sweeps the frequency of the electromagnetic wave between a cutoff frequency and double the cutoff frequency. The location, angle, or effective angle of an opening is adjusted by an opening adjuster. A path for an electromagnetic wave has a short for creating a standing wave. The path has a movable surface that can push and pull the peaks and valleys of the standing wave so as to achieve more uniform heating of the material. A dielectric wheel pushes and pulls the peaks and valleys of a standing wave so as to achieve more uniform heating of a material. A dielectric structure has a surface that has a short side and a long side. A motor rotates the dielectric structure to push and pull the peaks and valleys of a standing wave so as to achieve more uniform heating of a material. A path has a first choke flange that has a width w1, and a second choke flange that has a width w2.

Abstract: In a microwave system for heating, and controlling the temperature of, a heat bath including a containment for a liquid, with a wall on which the microwave system is mounted, the microwave system comprises a microwave source operating at an ISM frequency of 2 to 5 GHz, a microwave conductor for conducting microwaves from the microwave source to a resonator through a ceramic window disposed in the resonator wall, the resonator has a common wall portion with the containment, which common wall portion consists of a grid having a mesh width that prevents passage of microwave radiation but provides for communication of the liquid between the resonator and the containment.

Abstract: A path for a material passes through an opening and along a segment through an off-peak region of an electric field. An E-plane bend delivers an electromagnetic wave to the segment. A standing wave is used to heat the material. The peaks or valleys are pushed or pulled by a movable surface or by changing the frequency of the electromagnetic wave. A rectangular choke flange is used at the opening to the segment. A curved segment connects the segment to another segment for heating the material. According to another aspect of the invention, a segment is used to heat just the edge of a planar material.

Abstract: The microwave oven is provided with a magnetron and a wave guide. The wave guide is formed by a combining portion and a matching portion. The magnetron is provided with a magnetron antenna, and the magnetron antenna projects into the combining portion. The combining portion has one end connected to the matching portion, and has a structure in which the cross-sectional area does not change in the horizontal direction. The matching portion has a structure in which its cross-sectional area increases toward the side surface of a heating chamber. An antenna is provided on a mica board in the portion connecting a matching portion with another matching portion.

Abstract: A high frequency heating cooking apparatus is capable of preventing from rusting and reducing the cost substantially at the same time. The heating compartment of the high frequency heating cooking apparatus of the invention comprises a side wall, a top panel, and a bottom panel. By folding and plating one plated steel plate, the side wall having a left side wall, a right side wall, and a back side wall is formed. The plated steel plate has a function of preventing from rusting. The top panel is made of a stainless steel material, and this top panel has a power feed port, an intake hole, and an exhaust hole. The side wall made from a plated steel plate does not have opening ends of holes such as intake hole and exhaust hole.

Abstract: A system and method for annealing a film on a substrate in a processing chamber, including a microwave generator disposed to provide microwaves to an area within the interior of the chamber. The microwaves have a frequency such that the film is substantially absorptive at the frequency but the substrate is not substantially absorptive at the frequency. A waveguide distributes the microwaves over the surface of the film to provide a substantially uniform dosage of microwaves over the surface of the film. The method includes depositing a film on a substrate in the processing chamber. During at least a portion of the time of the depositing step, microwaves are generated having a frequency such that the film has an absorption peak at the frequency but the substrate lacks a substantial absorption peak at the frequency. The microwaves are directed towards the film.

Abstract: In an apparatus for the selective heating of foods disposed on a serving tray to serving temperature by means of a microwave oven having a gyrotron as a heat source, individual guide means are provided for guiding the microwave radiation individually to particular dishes on the tray and a control computer controls the radiation of, and the heat generated in, the dishes during passages of the tray with the dishes through the microwave oven.

Abstract: The applicator directs microwaves through a guide (5) and housing to focus microwaves generated from a microwave emitter to the surface of a target of contaminated concrete. The housing (4) of the applicator has a elliptical base and a truncated elliptical section with two focal areas (F1) and (F2). A component (11) is arranged at the focal area (F1) in the direction of the waveguide to diffuse incident waves to a wall of the housing where they are reflected to the focusing area (F2).

Abstract: A device for applying microwaves particularly for cooking products on a metallic support, includes at least one microwave generator (G) and a metallic waveguide, particularly of rectangular cross section (1, 11, 11', 11", 11"'). The waveguide forms a cooking chamber whose floor is constituted by a removable flat metallic support (5, T), on which are disposed the products to be cooked (6).

Abstract: The present invention relates to an Atmospheric Energy Projection System for projecting electrical and thermal energy. The Microwave Facilitated Atmospheric Energy Projection System (MFAEPS) uses microwave energy at the resonant frequency or frequencies of oxygen and/or water to heat the atmosphere. This improves the potential conductivity of the air in the path of the microwave beam by heating the oxygen and water molecules in the air providing a favored pathway for breakdown. A voltage pulse generator discharges through an electrode positioned near the center of the microwave beam's recent path and creates an ionizing wave that follows the microwave beam's recent path. Alternatively, a laser can substitute for the electrode and project a high powered beam that is focused to create breakdown and thus create the ionizing pulse that travels down the favored pathway. The system can operate in an underwater environment operating at the resonant frequency of water.

Abstract: An apparatus for generating uniform heating in material contained in a cylindrical vessel is described. TE.sub.10 -mode microwave radiation is coupled into a cylindrical microwave transition such that microwave radiation having TE.sub.11 -, TE.sub.01 - and TM.sub.01 -cylindrical modes is excited therein. By adjusting the intensities of these modes, substantially uniform heating of materials contained in a cylindrical drum which is coupled to the microwave transition through a rotatable choke can be achieved. The use of a poor microwave absorbing insulating cylindrical insert, such as aluminum oxide, for separating the material in the container from the container walls and for providing a volume through which air is circulated is expected to maintain the container walls at room temperature. The use of layer of highly microwave absorbing material, such as SiC, inside of the insulating insert and facing the material to be heated is calculated to improve the heating pattern of the present apparatus.

Abstract: A microwave oven includes a magnetron for generating electromagnetic wave energy, a waveguide for guiding and directing the electromagnetic wave energy into a cavity body defining a cooking chamber, and an antenna for radiating the electromagnetic wave energy generated by the magnetron into the waveguide. The waveguide includes a first opening for uniformly dispersing the electromagnetic wave energy into the cooking chamber, a second opening for uniformly dispersing the electromagnetic wave energy into the cooking chamber, and a short circuit for providing a short surface to the antenna. The first opening is formed on a portion of the waveguide which contacts the cavity body and extends along a longitudinal direction. The second opening is spaced away from and having a predetermined angle with respect to the first opening.

Abstract: A plasma processing apparatus and a plasma processing method used in etching, ashing, CVD, etc. in the manufacturing, etc. of large-scale integrated circuits (LSIs) and liquid crystal display panels (LCDs). The plasma processing apparatus includes a dielectric plate used for the passage of a microwave, a microwave window disposed to confront the dielectric plate, and a reaction chamber in which a sample stage is disposed to confront the microwave window. The apparatus is characterized in that the microwave window has a recess in the area confronting the sample stage. The plasma processing method is characterized by implementing a plasma process for a sample with the plasma processing apparatus. The method and apparatus are capable of raising the plasma density in the area confronting the sample, improving the plasma processing rate, improving the etch-through performance for fine hole patterns, and improving the yield of semiconductor devices.

Abstract: An apparatus for concentrating and solidifying a salt solution includes a vessel for containing the salt solution having an exposed surface, the vessel having a generally open upper portion, a cover for sealing the generally open upper portion of the vessel and having a generally hood shaped portion, the cover including at least one inlet conduit for admitting the salt solution to the vessel and a discharge conduit for vapor, and a magnetron for generating microwaves for heating the solution in the vessel. A microwave waveguide is disposed between the magnetron and the vessel and incorporates the cover, for directing microwaves from the magnetron into the vessel, the waveguide transitioning within the cover from the generally hood shaped portion into a horn having a variable cross-section and/or variable vertical spacing with respect to the vessel. This structure enables microwaves to be radiated directly onto the exposed surface of the salt solution in the vessel.

Abstract: The present invention overcomes many of the problems associated with electromagnetic exposure of planar materials. A diagonal slot compensates for the effects of signal attenuation along the propagation path. Adjustably variable path lengths allow peaks and valleys of the electromagnetic field in one exposure segment to compensate for peaks and valleys in another exposure segment. Dielectric slabs may be used to extend the peak field region between top and bottom conducting surfaces to allow for more uniform exposure of planar materials that have a significant thickness. Specialized choke flanges prevent the escape of electromagnetic energy. One or more rollers between exposure segments may be enclosed by an outer surface to prevent the escape of electromagnetic energy.

Abstract: A microwave oven adapted to radiate microwaves of mutually reverse phases to minimize impedance variation of a waveguide in response to load change of foodstuff, thereby maintaining an output of the microwave at a constant level regardless of load amount of the foodstuff and maintaining an electric field distribution in a cavity at a constant level as well.

Abstract: An electric cooking oven comprising a cooking vessel (1), a microwave energy source and a waveguide (2') substantially parallelepiped in shape delimited transversally by two substantially rectangular surfaces (20', 21') located in two parallel planes separated by a predefined distance (d), the output of guided waves occurring in at least two zones (230, 231) located in an outlet plane (23') perpendicular to the two surfaces and delimited by two parallel edges (b'.sub.1, b'.sub.4) connecting the two surfaces. The length (1) of the edges is greater than the distance (d) separating the two surfaces (20', 21') so as to optimize the number of excited transversal electric and/or transversal magnetic modes inside the cooking vessel in excitation planes parallel to the outlet plane.

Abstract: The Atmospheric Energy Projection System (AEPS) projects electrical/thermal energy using microwave radiation at the resonant frequency of oxygen. The radiation excites a column through the ambient atmosphere to a temperature such that air within the column is converted from an insulator to a conducting channel or focused medium. Electrical current is then applied to the channel to transmit an electric charge a predetermined distance. Rapid release of pulses of 60 GHz microwave radiation at a field strength below that for breakdown for the waveguide feeding the antenna or at the antenna aperture creates a channel without premature plasma generation. Once the channel is energized sufficiently, an electric charge is released into the channel and flows down it from the source to a solid the channel intersects. If no solid intrudes the charge diffuses harmlessly at the end of the heated channel as the channel cools back to the ambient temperature.

Abstract: A process for joining ceramic parts comprises autoclaving a powdered ceramic composition to increase its hydrogen form contents to a concentration that serves to increase the composition's absorption of microwave energy during subsequent heating of the ceramic parts; coating the autoclaved ceramic composition on the surfaces of the parts to be joined together; and placing the coated surfaces of the parts to be joined together and focusing microwave energy at the joint between the parts in order to seal the joint by refiring and rereacting the parts, the microwave energy being of sufficient power and being uniformly applied to the joint for a sufficient period of time to seal the joint.

Abstract: A feed that provides circularly polarized microwave energy such as for energizing a cavity in a microwave oven. The feed includes a transformer to match a linearly polarized rectangular waveguide to an exit waveguide which may be circular or square in cross section. The exit waveguide contains an asymmetrical element that provides symmetry about a plane only. The asymmetrical element therefore introduces a difference in microwave electrical phase of 90 degrees for polarizations which are respectively parallel to and perpendicular to the symmetry plane. The two components add to provide circularly polarized energy at constant magnitude but continually rotating phase. An extension may be used to modify the spread and matching of the energy from the exit waveguide into the enclosure.

Abstract: A microwave oven excitation system comprising a cylindrical microwave launcher for radiating microwave energy into a heating cavity of a microwave oven which is mounted adjacent to the heating cavity, a quarter-wave matching waveguide secured to the launcher, a rectangular waveguide secured to the quarter-wave matching waveguide, and a source of microwave energy at a predetermined operating frequency secured to the rectangular waveguide remotely from the launcher. In addition, a mode stirrer may be optionally installed within the cylindrical microwave launcher. Also, an iris may be optionally mounted between the cylindrical microwave launcher and the heating cavity.

Abstract: The present invention utilizes dielectric slabs to provide a relatively uniform electromagnetic field to a cavity between two or more dielectric slabs. Each dielectric slab is a thickness equal to or nearly equal to a quarter of a wavelength of the electromagnetic field in the dielectric slab. In a particular embodiment, sample material is introduced into the cavity between the two dielectric slabs. This sample material may be introduced through one or more openings in the dielectric slabs. In further embodiments, specialized choke flanges prevent the leakage of energy from this cavity. In a preferred embodiment, an elliptical conducting surface directs the electromagnetic field to a focal region between the two dielectric slabs. Openings to this focal region allow sample material to be passed through this region of focused heating.

Abstract: A microwave oven excitation system comprising a cylindrical microwave launcher for radiating microwave energy into a heating cavity of a microwave oven which is mounted adjacent to the heating cavity in either a substantially vertical position or a substantially horizontal position, a first hollow waveguide secured to the launcher, a first source of microwave energy at a predetermined operating frequency secured to the first waveguide, a second hollow waveguide secured to the launcher substantially perpendicular to the first waveguide, and a second source of microwave energy at a predetermined operating frequency secured to the second waveguide. Alternatively, a single waveguide is secured to the cylindrical launcher and has only a single source of microwave energy secured thereto. In either case, a mode stirrer can be installed within the cylindrical microwave launcher.

Abstract: A high frequency heating apparatus for heating an object to be heated is provided with an electromagnetic wave emission means for emitting electromagnetic waves, a local heating means capable of heating an optional portion of the object by the electromagnetic waves emitted from the emission means, and a control means for controlling the local heating means. The high frequency heating apparatus is further provided with a stage on which the object is placed, a protecting means for protecting the local heating means, a setting means and a detection means, so that the local heating means, the electromagnetic wave emission means or the stage is controlled in accordance with the setting means or the detection means.

Abstract: A structure for mounting a magnetron for a microwave oven is disclosed. The structure includes a wave guide member engaged with a lower plate forming the bottom surface of a cooking chamber and guiding microwaves into the interior of the cooking chamber, and a magnetron mounted at one side of the wave guide member and providing microwaves into the interior of the wave guide member, whereby the microwaves are provided in the direction from the bottom surface of the cooking chamber to the interior of the cooking chamber, for thereby supplying the microwaves in the direction from the bottom surface of the cooking chamber into the interior of the cooking chamber.

Abstract: A microwave oven waveguide structure which allows the use of low frequency microwaves which is sufficient for cooking, includes an indent portion in a waveguide which is mounted on one side of the inner housing and to which a microwave generated from the magnetron is transmitted, in a microwave oven having an inner housing for forming a cavity for accommodating food and a magnetron for generating a microwave.

Abstract: The present invention overcomes many of the problems associated with electromagnetic exposure of planar materials. A diagonal slot compensates for the effects of signal attenuation along the propagation path. Adjustably variable path lengths allow peaks and valleys of the electromagnetic field in one exposure segment to compensate for peaks and valleys in another exposure segment. Dielectric slabs may be used to extend the peak field region between top and bottom conducting surfaces to allow for more uniform exposure of planar materials that have a significant thickness. Specialized choke flanges prevent the escape of electromagnetic energy. One or more rollers between exposure segments may be enclosed by an outer surface to prevent the escape of electromagnetic energy.

Abstract: A microwave oven for radiating microwaves generated from a magnetron into a cavity to heat and cook foodstuff disposed therein, the microwave oven comprising an antenna disposed between a magnetron and the cavity for converting the microwaves to circularly polarized waves to radiate same into the cavity, the microwave oven having the advantage in that the foodstuff in the cavity is heated by radiation of the circularly polarized waves, thereby enabling a uniform heating of the foodstuff and improving an absorption efficiency of microwave energy.

Abstract: A waveguide of a microwave oven is provided to keep constant output and electric field distribution at a cavity regardless of food load by minimizing change in impedance of waveguides depending on food load for cooking, the waveguide comprising radiating holes of first and second output waveguides formed at top and bottom parts of a lateral wall of the cavity centering the power supply hole of the input waveguide to spray microwaves having the electric fields of opposite phases, whereby change in impedance of the waveguide depending on the change in food load is minimized to keep the output from the microwave oven and the electric field distribution constant regardless of food load.

Abstract: A microwave oven is disclosed in which the structure of the wave guiding tube is improved such that the variation of the impedance is minimized in spite of the variation of the load of the food, thereby making it possible to maintain the output of the microwave oven at a constant level regardless of the load of the food. The microwaves are divided into a plurality of wave streams, and the wave streams are made to have different phases. The microwave oven includes an input wave guiding tube coupled with a magnetron, for receiving microwaves from the magnetron. A first output wave guiding tube communicates to the input wave guiding tube, for receiving the microwaves from the input wave guiding tube to diffusely irradiate the microwaves into a cavity. A second wave guiding tube communicates to the input wave guiding tube, for converting the microwaves to a phase different from that of the first wave guiding tube to irradiate them into the cavity.

Abstract: A microwave oven which can uniformly distribute a microwave in a cooking cavity. The oven has a cabinet having a cooking cavity and a control chamber separated from the cooking cavity, a door installed at a front of the cooking cavity, a magnetron installed at the control chamber for generating a microwave, and a wave guide for guiding the microwave generated by the magnetron into the cooking cavity. The cooking cavity is defined by an upper wall, a bottom wall, a first side wall at which the wave guide is attached, a second side wall positioned opposite to the first side wall, the door, and a third side wall positioned opposite to the door. The first side wall is formed with a microwave outlet. The second and third side walls are formed with at least one arcuate concave portion for distributing the microwave. The oven uniformly penetrates the microwave into foodstuffs in vertical and horizontal directions, thereby effectively heating the foodstuffs.

Abstract: An electromagnetic wave generated from a magnetron of a microwave oven is dispersed into the cooking chamber from an opening through a waveguide. A first plurality of ring-shaped steps are formed radially on a top wall inside the cooking chamber. One ring-shaped step with a larger radius of the first ring-shaped steps is lower in height on the basis of a bottom surface of the cooking chamber than another ring-shaped step with a smaller radius, and a central part with the opening is highest in height. A second plurality of ring-shaped steps are formed radially on a bottom face inside the cooking chamber. The waveguide is provided with a third plurality of ring-shaped steps capable of maintaining a maximum electromagnetic field energy. Thus, the microwave is impartially dispersed while maintaining the maximum electromagnetic field energy in the cooking chamber and in the waveguide, and the cooking efficiency is largely improved.

Abstract: An even heating apparatus for converting microwave energy emitted from a magnetron to a plurality of resonant modes in a heating chamber of a microwave oven for thereby evenly heating the food in the heating chamber includes an antenna array plate including a plurality of antennas therein. The apparatus evenly heats food in the heating chamber by fixing the antenna array plate having multiple antennas therein spaced from the ceiling of the heating chamber.

Abstract: A microwave oven is disclosed, in which the edges of the opening between the cooking chamber and electrical component compartment are bent, thereby strengthening the side panel on which the opening is formed and also forming half of a joining means which connects a cover plate to the opening. The cover plate includes hooked catches(the other half of the joining means) and flexible sealing members that lie flush against the side panel when the cover plate is installed. The elasticity of these sealing members allows them to maintain a tight seal even if the shape of the side panel becomes distorted during the assembly of the microwave.

Abstract: A method and apparatus for liquid thermoset resin or polymer molding using electromagnetic waves (particularly radiofrequency waves or microwaves), is described. The method and apparatus uses a metal mold (10, 212) with a cavity (401) for the molding as well as for confinement of the electromagnetic waves. Multiple low loss ports (A, B, C, D, E, p1, p2, p3) are provided for introducing the microwaves into the cavity.

Abstract: An assembly for applying microwave irradiation to a load having a generally circular cross-section. The applicator supports a dominant TM.sub.120 mode and the load is aligned with a central axis in the applicator, with each aperture of a pair of feed apertures diametrically opposed (for the circular cross sectional case) or located on parallel opposed walls (for the polygonal cross sectional case) with one of the pair of feed apertures positioned at 90 degrees with respect to the other pair about the axis. The applicator may be formed as a cylinder or as a polygonal prism of the type having parallel opposed sides, such as those having a square, hexagonal or octagonal cross-section. Means such as a microwave transparent tube or conveyor provide for positioning of the load in the applicator. In an alternative embodiment, two cavities are used, with one cavity associated with each of the two feed systems, and a means for conveying the load from the first cavity to the second cavity is provided.

Abstract: A microwave applicator of microwave reflective material having a closed first end, four side walls and, in a first embodiment, an open second end spaced apart from and facing a ground plate, the ground plate extending in a pair of transverse directions and having a longitudinal direction perpendicular thereto, and in a second embodiment, a closed second end, the applicator forming a cavity containing a desired hybrid mode having a low wave impedance in the longitudinal direction and an absence of an E field component in one of the transverse directions.

Abstract: A uniform heating apparatus for a microwave oven and a method thereof which are capable of more uniformly heating food by generating various resonant modes based on the kind of food. The apparatus includes an oscillator unit having a wave guide tube for guiding microwaves generated by a magnetron to a lower portion of a heating chamber formed in a microwave oven main body, a resonant mode conversion unit for converting the microwaves guided to the lower portion of the heating chamber to have various resonant modes, a plurality of sensors for detecting the characteristics of food when the microwaves, the resonant mode of which is converted by the resonant mode conversion unit, are supplied to the food in the heating chamber, and a controller for controlling the oscillator unit and the resonant mode conversion unit in accordance with the characteristics of the food detected by the sensors.

Abstract: Disclosed is a wave guide system of a microwave oven which has a partition wall for separating a cavity in which food to be cooked is placed from a control room in which a magnetron for generating microwaves is provided, the partition wall having a first and second microwave feed openings for feeding the microwaves to the food; and a wave guide provided to the partition wall where the first and second microwave feed openings are formed, the wave guide having a horizontal upper wall, a side wall to which the magnetron is attached, and a lower wall having a first inclined portion connected to the side wall, a second inclined portion connected to the partition wall, and a vertical portion provided between the first and the second inclined portion.

Abstract: A microwave processing system is disclosed. The system is particularly useful for concurrently controlling a plurality of chemical reactions from a single microwave source. The system comprises a source that produces electromagnetic radiation in the microwave range; a waveguide in communication with the source and into which the source propagates microwave radiation; a resonator in communication with the waveguide; and an adjustable dynamic moderating device between the waveguide and the resonator for moderating the wave energy passing from the waveguide to the resonator without substantially changing the propagated mode in the waveguide.

Abstract: The system includes radiation generation and transmission components which radiate tuned microwave electromagnetic energy outwardly from a vehicle through an antenna into a fluid medium through which the vehicle is moving. The microwave radiation is at the frequency of harmonic resonance electromagnetic excitation of the molecules of the medium which produces efficient heating of the fluid resulting in a reduction of the mass density thereof. This reduction decreases the drag forces acting on the vehicle resulting in a greatly enhanced aerodynamic and/or hydrodynamic efficiency and also decreases the intensity of the shock waves (which often lead to sonic booms). An aircraft's dramatically higher speed in the surrounding rarefied medium can make it appear to be travelling at "supersonic" speeds.

Abstract: Disclosed is a wave guide used in a microwave oven, by which superimposed high-frequency microwaves are radiated towards food to be heated, and distorted waves included in the high-frequency microwaves are removed. The wave guide has a housing provided with a magnetron, a mode transducer disposed in the housing so as to superimpose and distribute a high-frequency microwave radiated from the magnetron, and a differential mode absorber for absorbing a distorted wave included in the high-frequency microwave which has been passed through the mode transducer. The mode transducer includes a first hollow-frustuconical member welded to an inner wall of the housing, a second hollow-frustuconical member accommodated in the first hollow-frustuconical member, and a transmission line attached to an inner wall of the second hollow-frustuconical member.

Abstract: A method and apparatus for liquid thermoset resin or polymer molding using electromagnetic waves (particularly radiofrequency waves or microwaves), is described. The method and apparatus uses a metal mold (10, 212) with a cavity (401) for the molding as well as for confinement of the electromagnetic waves. Multiple low loss ports (A, B, C, D, E, p1, p2, p3) are provided for introducing the microwaves into the cavity.