Abstract: An appliance, such as an oven, includes a housing having an internal compartment and an RF antenna. At least a portion of the housing comprises an electrically conductive portion. The antenna includes an active component and a connection to the electrically conductive portion, which serves as a ground plane of the antenna. The housing may include a door assembly having a window that includes the electrically conductive portion in the form of a transparent conductive layer. The door assembly may be detachable and the connection to the antenna may be made by way of capacitive coupling. In an alternative arrangement, the housing includes a light fixture for illuminating the internal compartment, wherein the active component of the antenna is disposed in the light fixture.

Abstract: An oven includes a plurality of walls, a fan, and a heating element. The plurality of walls defines an internal cavity in which food may be placed for cooking. A first of the plurality of walls defines a plurality of orifices that establishes fluid communication between the internal cavity and a fluid path. The fan is configured to direct air from the fluid path, through the plurality of orifices, and into the internal cavity. The heating element is disposed on the first of the plurality of walls and adjacent to the plurality of orifices. The heating element is configured to heat the air being directed from the fluid path, through the plurality of orifices, and into the internal cavity.

Abstract: A selective heating device may include a chamber, at least one heating element, and a circuit. The at least one heating element may selectively heat a first portion of a target in the chamber at a first energy level for a first period of time. The at least one heating element may also selectively heat a second portion of the target at a second energy level for a second period of time, wherein the second energy level and/or the second period of time are different from the first energy level and/or the first period of time; or refrain from heating a third portion of the target; or a combination thereof. The circuit may receive a heating instruction and control the at least one heating element based on the heating instruction.

Abstract: Provided is a wideband electromagnetic wave (EMW) absorber including a magnetic composite having a structure in which magnetic particles are dispersed in a polymer resin, and a plurality of conductive lines arranged in the magnetic composite, and a method of manufacturing the same. The wideband EMW absorber can be used for a device configured to emit EMWs and effectively absorb wideband EMWs.

Abstract: A microwave heater equipped with a microwave choke and suitable for heating one or more articles under vacuum. The microwave choke inhibits leakage of microwave energy between a door of the heater and a main vessel body of the heater without causing arcing at the choke, even at low pressures. In certain situations, the microwave choke can be configured with side-by-side choke cavities. In certain situations, the microwave choke can be removably coupled to the door and/or vessel body for easier fabrication, installation, and/or replacement.

Abstract: Systems and methods for thermal preservation (sterilization) of heterogeneous and multiphase foods and biomaterials in order to achieve their shelf stability at ambient level temperatures. Flowing heterogeneous, multiphase foods and biomaterials are exposed to single or multiple stages of electromagnetic energy under continuous flow conditions within conduits passing through the electromagnetic energy exposure chambers.

Abstract: A microwave filter for use with a microwave brazing system having a brazing chamber, a vacuum line, and a pressure gauge located proximate the vacuum line. The microwave filter comprises a baffle plate configured to be mounted in an opening between the brazing chamber and the pressure gauge, and a plurality of hollow pipes configured to substantially prevent the transmission of microwaves from the brazing chamber to the pressure gauge, and further configured to allow gas to flow between the brazing chamber and the vacuum line.

Abstract: An observation window for a microwave device exhibiting microwave radiation of a predetermined frequency, the observation window comprising two optically transparent conductive films, each of the transparent conductive films primarily reflecting incident microwave radiation and being substantially parallel and spatially separated from each other by a predetermined distance, the predetermined distance being equal to an odd integer multiple of one quarter of the wavelength of the microwave radiation of the predetermined frequency in the interstice between the transparent films, the predetermined distance having a tolerance of plus or minus 0.15 of the wavelength in the interstice.

Abstract: The microwave unit door includes a metallic door frame (1) with an interior glass pane (3) and outer glass pane (2) held spaced apart in it. To improve the observability of the interior of the microwave unit without loosing the microwave shielding effect, e.g. previously provided by a metal screen between the glass panes, and to prevent condensate formation, the interior glass pane (3) closest to the processing space (I) has at least one optically transparent electrically conductive first layer (13) with a microwave absorption capability such that it heats up to prevent condensate formation during operation. The outer glass pane (2) has at least one optically transparent electrically conductive second layer (12) reflecting microwaves passing through the first layer.

Abstract: The microwave unit door includes a metallic door frame (1) with an interior glass pane (3) and outer glass pane (2) held spaced apart in it. To improve the observability of the interior of the microwave unit without loosing the microwave shielding effect, e.g. previously provided by a metal screen between the glass panes, and to prevent condensate formation, the interior glass pane (3) closest to the processing space (I) has at least one optically transparent electrically conductive first layer (13) with a microwave absorption capability such that it heats up to prevent condensate formation during operation. The outer glass pane (2) has at least one optically transparent electrically conductive second layer (12) reflecting microwaves passing through the first layer.

Abstract: Separable nanotubes are made from a transition metal oxide, preferably from a vanadium oxide of variable valence. They show a greater oxidation resistance than the carbon-based nanotubes known so far and offer many new and economic applications. The inventive nanotubes clearly show oxidation-reduction activities and are particularly suited as an active material for catalytic reactions.

Abstract: A detector facilitates visualization of electromagnetic radiation, including radio frequency radiation. The electromagnetic radiation is converted to thermal energy by partial absorption of the radiation, and is made visually observable by coupling the pattern of thermal energy to a thermally-responsive imaging surface, such as a liquid crystal display.

Abstract: A microwave oven comprises a cabinet and a door attached to the cabinet to form a food processing chamber. The door has a screen, an absorbing film, and a frame. The screen reflects microwave energy away from the absorbing film, the screen has a plurality of screen lines and a plurality of screen openings defined by the plurality of screen lines, and the screen has a screen period. The absorbing film absorbs microwave energy passing through the screen. The frame supports the screen and the absorbing film in order to form a window through the door and to maintain leakage of microwave energy through the door from the food processing chamber below a predetermined level. The frame supports the screen and the absorbing film so that the screen and the absorbing film are separated by a distance which is as least as great as the screen period, and the screen and the absorbing film are electrically attached to the frame.

Abstract: A radio wave absorbent comprises an Ni--Cu--Zn base ferrite having a major composition comprising 49 to less than 50 mol % of Fe.sub.2 O.sub.3, 32 to 35 mol % of ZnO, 3 to 9 mol % of CuO and 9 to 14 mol % of NiO. The radio wave absorbent further contains an additive molybdenum oxide in an amount of greater than 0 to 0.10 wt %, calculated as MoO.sub.3, with the proviso that the total amount of the major composition is 100 wt %. The radio wave absorbent may be used as an exterior or interior material for a building or structure.

Abstract: A microwave oven includes a main body forming a cooking chamber, and a door hinged to the main body. A rear side of the door includes an endless choke groove and a sealing member surrounding the choke groove. The sealing member is biased by a spring into contact with the main body to prevent a leakage of microwaves therebetween.

Abstract: A microwave oven door includes a shielding panel, which is made of a material through which microwaves cannot pass, having a contact section that opposes a front panel of the oven when the door is closed. A plurality of slits arranged in the contact section and/or the front panel, or both, prevent microwaves from leaking out through a gap formed between the front panel and the contact section. The slits are arranged in at least one row shaped as a closed loop and are evenly spaced from each other. The length of each slit corresponds to about 1/2 of a wavelength of a microwave, and the width of each slit corresponds to no more than 1/16 of the wavelength of the microwave. The interval between two adjacent slits corresponds to no more than 1/16 of the wavelength of the cooking microwave.

Abstract: A connection device for two successive segments (1A, 1B) of a tunnel oven for cooking food, comprises a first sleeve (16A) fixed to the frame (18) of the tunnel and second sleeve (17) secured to the tunnel segments (1A, 1B). The second sleeve (17) is mounted axially slidable relative to the first sleeve (16A). Seals (25) are disposed between the first and second sleeves, within the thickness of these latter, so as to permit sliding without loss of sealing. The device also comprises, in series, a quarter wave trap (26) and a body (31) that absorbs microwaves, also disposed within the thickness of the device.

Abstract: The method of forming a microwaveable package, generally from a plurality of liners of material, and incorporating a heat-assist layer preferably intermediately of the liners of material, which said heat assist material comprising powdered carbon, that is originally applied to the inner surface of one of the intended liners, and in register at that location where the layer is desired within the formed microwave package. The material may be imprinted by a gravure or other roller application onto the inner surface of one of said liners of material, or adhesive applied or added onto that adhesive that laminates the liners together, in order to assure that proper and convenient registration of the layer within the laminate material, and provide for its location within the formed package preferably at a lower position where the food or other product is arranged, during microwaving, to attain that necessary heat assist desired from its addition.

Abstract: An absorber for a microwave module and method of fabrication thereof wherein an ink is provided from a mixture of powdered iron and a resin. The ink is then screen printed or mask printed onto the interior surface of the lid of the microwave module in a predetermined pattern to lower the Q of the cavities within the module. The lowered Q suppresses the electromagnetic resonance and thereby minimizes the EMI problems. Furthermore, the absorber material reduces EMI between sections of the module at frequencies where no cavity resonances occur.

Abstract: A method of sintering ceramic materials following: A compacted article comprising inorganic particles coated with carbon is provided, the carbon providing improved microwave coupling. The compacted article is then heated by microwave radiation to a temperature and for a period of time sufficient to sinter the compacted article.

Abstract: A plurality of samples in a moist medium are treated simultaneously in a microwave cavity. The samples are conducted into the cavity through apertures formed in an upper wall of the cavity. Each aperture is surrounded by a chimney configured to create a barrier opposing the propagation of microwaves from the cavity. The samples are introduced into receptacles which extend through the chimneys. Each receptacle can be supported on the chimney a lower end of the receptacle disposed within the cavity. Alternatively, the receptacles can be in the form of continuous tubes extending through upper and lower walls of the cavity in order to convey continuous flows of the sample.