222 results about "Microwave shielding" patented technology

An isolation apparatus for reducing radiated emissions of a microwave energy delivery system including an isolation circuit board and a shield coupling, the isolation circuit board and shield coupling configured to capacitively couple a microwave generator and a coaxial transmission cable and the isolation circuit board further configured to pass energy at a fundamental frequency between the microwave generator and the coaxial transmission cable.

A microwavable package may include one or more microwave-absorbing regions, microwave-shielding regions, and/or embossed regions designed to enhance microwave cooking of food products. Microwave-absorbing regions (i.e., solid susceptors) may promote thermal cooking, browning, and/or crisping of food products. Microwave-shielding regions (i.e., patterned susceptors) may promote uniform cooking and inhibit overcooking of food products. A patterned susceptor may be a conductive grid or a grid of conductive or non-conductive shapes. In an embodiment, solid susceptors and patterned susceptors. may be formed from a common thin metal film on a common polymer barrier layer and laminated to a common structural backing layer. An embossed region of a microwavable package may promote crisping of a food product by allowing air to circulate between the food product and an interior surface of the microwavable package.

A method to control microwave heating of containers of foodstuff products to optimize heating of the foodstuff product, and reduce microwave activity is provided. Heating is optimized by selectively placing microwave shielding material around portions of side walls of the product container.

The invention belongs to a microwave and steam cooking two-purpose microwave oven, which comprises a barrel-type furnace body with an opened upper part and a sealed bottom, and a cylindrical working cavity arranged in the barrel-type furnace body, a spherical oven door provided with a microwave shielding layer, a microwave generation and control box, a steam heating steamer and a microwave and steam mixed heating steamer, wherein the microwave generation and control box comprises a microwave generator, a transformer, a cooling fan, a capacitor, a control circuit and a control panel. The oven body and the microwave working cavity are respectively changed into the barrel-type furnace body with the opened upper part and the sealed bottom and the cylindrical working cavity, and the lower partof the working cavity can be used for filling steam water and can also used for placing foods for cooking by directly utilizing microwaves, therefore, the microwave and steam cooking two-purpose microwave oven has the characteristics that the structure is simple and reliable, foods can be cooked by directly microwaves or steam or microwaves and steam, thus the advantage of microwave heating is fully developed, the use range of the microwave oven is effectively enlarged, and the utilization rate and the energy-saving effect of the microwave oven are improved.

A microwave oven comprises an oven seat, a microwave generating unit and a cooking cavity. The cooking cavity is composed of a cavity enclosed by a supporting mechanism arranged on the oven seat and a microwave shielding cover; the microwave shielding cover can be opened or locked relative to the oven seat and/or the supporting mechanism; the supporting mechanism comprises an oven cover on the oven seat; the oven cover is tabulate, discal or kettle-shaped and the surface of the oven cover is equipped with microwave through holes corresponding to a microwave emitting area. The microwave oven cooking cavity of the invention directly consists of the supporting mechanism for holding food and the microwave shielding cover; the oven seat equipped with the microwave generating unit is positioned below the cooking cavity; the microwave from the microwave generating unit is emitted to the cooking cavity from bottom to top to heat the materials in the cooking cavity, thus breaking through the design of the traditional microwave ovens. In addition, the heated materials are put on a supporting plate of the supporting mechanism from the upward side, thereby facilitating the operation and cleaning. The microwave oven features simple and reasonable structure, easy manufacturing and processing, high heating efficiency and small floor area.

The present invention provides a wireless AP performance automatic test system, which includes a test host equipped with a test server, a test terminal equipped with a standard wireless network card, and a microwave shielding dark room, and the AP to be tested and the antenna of the standard wireless network card are respectively set In the microwave shielding chamber, a standard wired network card is also provided in the test host, and the standard wired network card is connected to the tested AP through a network cable, and the antenna and the standard wireless network card are connected through a cable. connection; in the microwave shielding anechoic room, the tested AP is set on a controllable 360-degree turntable. By rotating the turntable, the indicators of STAs at different angles can be simulated.

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.

The invention relates to the technical field of microwave tests and in particular relates to a scanning device for near-field test of antennas. The scanning device for near-field test of antennas comprises a microwave shielding darkroom with a wave-absorbing material on the wall and further comprises a computer, a vector network analyzer, a three-dimensional moving system and a near-field test probe, wherein the computer is connected to the vector network analyzer; the input end of the vector network analyzer is connected to the near-field test probe; the near-field test probe is fixed at the front end of a multi-joint robotic arm of the three-dimensional moving system. The three-dimensional moving system comprises a PLC (Programmable Logic Controller), a servo driver, a multi-joint robotic arm and a servo motor. The repeated positioning precise of the probe can reach +/-0.01mm; the positioning planeness can reach +/-0.03mm; connection communication is realized between the PLC controller and the computer by virtue of an Ethernet communication network; the three-dimensional moving system performs real-time precise control by virtue of the computer. The scanning device for near-field test of antennas is high in degree of automation, high in precision, integral in parts and high in integration level and is convenient to use and maintain.

The invention provides a microwave automatic heating device. The microwave automatic heating device comprises a microwave generator, a microwave cavity, a control system, a microwave power control module and a microwave local shielding part, wherein the microwave generator transmits microwaves into the microwave cavity; the microwave cavity is used for holding a light-absorbing material; the microwave local shielding part is positioned in the microwave cavity, and is used for covering the outer surface of the light-absorbing material; the microwave local shielding part consists of a microwave shielding area and a microwave penetration area; the microwave penetration area comprises one or more apertures in order that the microwaves in the microwave cavity can enter the light-absorbing material from the aperture(s) in order to be absorbed; the control system arranged outside the microwave cavity is used for automatically adjusting the turn-on/off and/or power of the microwave generator by automatically controlling the microwave power control module. By adopting the microwave automatic heating device provided by the invention in conjunction with a computer automatic control technology, fixed-point and/or directional heating under automatic control can be performed on the light-absorbing material.

The invention provides a semiconductor microwave electric cooker which comprises an electric cooker liner used for containing food, an upper cover microwave shielding case, a base microwave shielding case, a semiconductor microwave generator and a waveguide box, wherein the upper cover microwave shielding case has an exhaust hole communicated with the liner; the base microwave shielding case has a waveguide hole; the waveguide box is fixed on the base microwave shielding case and corresponds to the waveguide hole; an aerial head of the semiconductor microwave generator is arranged in the waveguide box; and the electric cooker liner is arranged in a microwave shielding cavity formed by the upper cover microwave shielding case and the base microwave shielding case. The semiconductor microwave electric cooker is simple and compact in structure, high in power of semiconductor microwave heating, rapid in heating, even in heating, good in cooking effect and good in safety performance.

The invention provides a simple and practical indoor polarization scattering measurement system, which is used for obtaining high-polarization-purity scattering data based on a vector network analyzer. The indoor polarization scattering measurement system is formed by the vector network analyzer, antennas, a main control computer, a microwave shielding darkroom and a turntable control cabinet. By filling a part of absorbing materials between the antennas, influence of mutual coupling between the antennas is reduced physically;and after converting broadband step frequency domain data to a time domain, near-end antenna mutual coupling signals are removed by utilizing selectivity of a time domain wave door. High-purity target polarization scattering characteristic data is obtained through a method of setting appropriate parameters and the like for the step frequency signals, and polarization data purity is higher than 45 dB; and the polarization scattering measurement system is simplified, and a lot of production cost is reduced.

The invention discloses a rock microwave fracturing testing device based on true triaxial loading. The rock microwave fracturing testing device based on true triaxial loading comprises a true triaxialloading assembly and two microwave radiation fracturing assemblies, and the two microwave radiation fracturing assemblies are the microwave radiation surface fracturing assembly and the microwave radiation in-hole fracturing assembly respectively; the true triaxial loading assembly comprises a fixed loading frame, a movable loading frame, a base, a rail, a sliding table and a two-degree-of-freedom movable frame; two groups of Z-direction actuators and two groups of Y-direction actuators are arranged on the fixed loading frame, and an X-direction actuator is arranged on the movable loading frame; a rock sample loading cavity is located in the middle of the fixed loading frame; both the movable loading frame and the sliding table are arranged on the rail through sliding blocks; both the microwave radiation surface fracturing assembly and the microwave radiation in-hole fracturing assembly are installed on the sliding table through the two-degree-of-freedom movable frame, and the slidingtable and the two-degree-of-freedom movable frame are driven by servo motors; a microwave shielding net is arranged on the movable loading frame, and the testing device is wholly arranged in an electromagnetic shielding chamber.

A door assembly for a microwave or electric oven is disclosed, which has an improved structure in which an optimum microwave-shielding frequency is not changed even though an incident angle of microwave is changed, to obtain a user's convenience on cleaning a door. The door assembly for a microwave oven includes a door frame to open and close a cooking cavity; and a door filter having a filter plate adhered to one side of the door frame, a choke portion bent to an opposite side of the cooking cavity in an edge of the filter plate, a first slot formed in a width direction of the choke portion, and a second slot formed in a length direction of the choke portion.

The invention discloses a multifunctional ultrasonic microwave collaborative chemical reactor and a method for preparing a nano semiconductor chalcogenide by using the same. The multifunctional ultrasonic microwave collaborative chemical reactor comprises an ultrasonic generator, a microwave generator, a temperature/time/power display control device, a reaction vessel, a condensing device, a microwave resonator, a microwave shielding device, an air exhausting and air feeding device, and a reaction vessel supporting and lifting device. The chemical reactor has the advantages of uniform vibration, consistent action stressed by all the points in a sample medium, many varieties of selectable extraction solvents, wide range of targets, reduction of the binding force of the targets and sample substrates; accelerated process of the targets from solid phase to solvent phase, large processed sample amount and the like. The chemical reactor can overcome the phenomenon of overheat charring, and can obtain more uniform and better-quality products than single microwave reaction. The chemical reactor has wide application prospect in the fields of chemistry and chemical industry, pharmacy, materials, energy sources, food processing and the like.

A bidirectional wave absorption strong electromagnetic shielding optical window of a multilayer graphene mesh/metal mesh laminated structure belongs to the optical transparent member electromagnetic shielding technology field. The electromagnetic shielding optical window utilizes the different light transmission and microwave shielding characteristics performed by the graphene mesh films when the graphene mesh films have different mesh unit hole area ratios to organically combine the low-reflection and partial absorption microwave characteristics of the graphene mesh films with the strong electromagnetic reflection characteristics of the high-light transmission dual-layer metal meshes, and the multilayer graphene mesh films are placed at the two sides of the dual-layer metal meshes to form a multilayer structure. The dual-layer metal meshes separated by the graphene mesh films are used as the transparent reflection layers, and the graphene mesh films separated by the transparent mediums are used as the transparent absorption layers. By the structure, the radio frequency radiation at the two sides of the optical window can penetrate the absorption layers simultaneously and repeatedly to be absorbed strongly, so that the bidirectional strong shielding and low-reflection characteristics are realized, the visible light has a high light transmission rate by transmitting the laminated structure once. The electromagnetic shielding optical window solves the problem that a conventional transparent electromagnetic shielding method can not consider the bidirectional low-electromagnetic reflection, the strong electromagnetic shielding and the high light transmission simultaneously.

The invention relates to a microwave shielding fibre and its preparation method. It has a skin-core structure whose skin-core volume ratio is 2:8-6:4, skin material composition includes (by wt%) 49-89.8% of skin layer polymer, 10-50% of coductive powder and 0.2-1% of coupling agent; and the core layer material composition includes (by wt%) 13-79.7% of core layer polymer, 20-85% of microwave absorbent and 0.3-2% of compatibility. Its preparation method includes the following steps: 1. uniformly mixing materials according to the formula of skin layer material, extruding by using twin screw extruder and granulating at 180-290 deg.C to make skin layer material of said microwave hielding fibre; 2. uniformly mixing materials according to the core layer material formula, extruding and granulating at 180-280 deg.c to make core layer material; 3. using skin-core composite spinningm achine to make the skin layer material and core layer material into windup filament yarn, drawing at 70-100 deg.C to obtain the invented product.