136 results about "Microwave applications" patented technology

The present invention relates to minimally invasive surgery techniques. It provides a method for manufacturing an antenna for percutaneous acute hyperthermia microwave applications of the monopole or dipole co-axial type provided with trap, commonly called choke, for blocking the propagation of the backwards reflecting wave towards the generator. The miniaturisation of the device allows a use minimally invasive for interstitial hyperthermia in medicine and surgery, in particular for oncology. The method of manufacturing the antenna provides a metal needle (1) for the introduction of the antenna (2, 3, 4) in the target tissue. On the external conductor (4) of the antenna (2) a metal collar (6) is connected in a predetermined position; a plastics sheath (5) is applied in order to cover the external conductor (2) in the portion between the feed (7) and the collar (6); the inner wall of the metal needle (1) wherein the antenna is inserted is then used for containing and guiding the collar (6) and the sheath (5); in particular, the collar (6) being in electrical contact with the inner wall of the metal needle (1). An antenna is thus obtained with choke of variable length and with miniaturized diameter. A thermocouple can be introduced through the choke that protrudes the directly in the "feed" zone.

A system and method for supplying microwave energy to tissue for microwave therapy includes an electrosurgical generator having an output for coupling to a surgical instrument. The electrosurgical generator includes a microwave energy source and a controller for controlling the operation of the electrosurgical generator. The surgical instrument, coupled to the electrosurgical generator, includes a microwave antenna for delivering microwave energy from the microwave energy source. The controller of the electrosurgical generator is operable for causing the electrosurgical generator to apply at least two pulses of microwave energy.

The present invention relates to minimally invasive surgery techniques. It provides a method for manufacturing an antenna for percutaneous acute hyperthermia microwave applications of the monopole or dipole co-axial type provided with trap, commonly called choke, for blocking the propagation of the backwards reflecting wave towards the generator. The miniaturization of the device allows a use minimally invasive for interstitial hyperthermia in medicine and surgery, in particular for oncology. The method of manufacturing the antenna provides a metal needle (1) for the introduction of the antenna (2,3,4) in the target tissue. On the external conductor (4) of the antenna (2) a metal collar 6 is connected in a predetermined position; a plastics sheath (5) is applied in order to cover the external conductor (2) in the portion between the feed (7) and the collar 6; the inner wall of the metal needle 1 wherein the antenna is inserted is then used for containing and guiding the collar 6 and the sheath 5; in particular, the collar 6 being in electrical contact with the inner wall of the metal needle 1. An antenna is thus obtained with choke of variable length and with miniaturized diameter. A thermocouple can be introduced through the choke that protrudes the directly in the “feed” zone.

The invention discloses a tea making technology using light microwaves. The technology comprises the following steps of: sunning with light waves; putting fresh tea leaves in light wave equipment; turning on a power supply, wherein the wavelength of the light waves is 250-800nm, the power is 400-3,000W, and the illumination time is 1-10min; removing green with light microwaves, drying and sterilizing; extracting aroma with light waves; and performing tea screening, check and vacuum packing to obtain a tea product. The light microwaves are applied to the tea processing; and due to the non-thermal effect of the light microwave electric field in the green removing and drying processes, the processing time is greatly shortened, and the tea quality is maintained. Meanwhile, the light microwaves have a sterilization function and can effectively kill microorganisms in tea. Through the tea making technology using light microwaves, the fresh leaves can be collected and processed on the site, and the processes of sunning, green removing, drying, aroma extraction and sterilization are finished in one step, thus the efficiency is high, the operation is simple and the production cost is effectively reduced. Through the invention, the prepared tea has high and stable quality.

High frequency circuits for wireless, digital and microwave applications place requirements upon the impedance of their signal lines, interconnects and packaging. In designing and implementing the substrates for these signal lines it is beneficial to employ meta-materials to provide the desired impedance. Such meta-materials providing a means to provide modified permittivity and permeability for the substrate, these being different than the real permittivity and permeability of the insulator used. In an example embodiment, a substrate is configured as a meta-material. It is desirable therefore to have a means to model these meta-material aspects of the signal lines rapidly and accurately allowing the circuits, interconnects and packages to be designed and implemented without expensive andexhaustive iterative experimental characterization. Within the cited invention design parameters for the meta-material structure are determined in dependence upon input parameters characterising the conductive medium, dielectric medium enveloping the conductive material, and the pre-determined shapes of the conductive medium.

Disclosed are synthetic garnets and related devices that can be used in radio-frequency (RF) applications. In some embodiments, such RF devices can include garnets having reduced or substantially nil Yttrium or other rare earth metals. Such garnets can be configured to yield high dielectric constants, and ferrite devices, such as TM-mode circulators / isolators, formed from such garnets can benefit from reduced dimensions. Further, reduced or nil rare earth content of such garnets can allow cost-effective fabrication of ferrite-based RF devices. In some embodiments, such ferrite devices can include other desirable properties such as low magnetic resonance linewidths. Examples of fabrication methods and RF-related properties are also disclosed.

The present invention is directed to a thick film composition for use in low temperature co-fired ceramic circuits comprising, based on weight percent total thick film composition: (a) 30-98 weight percent finely divided particles selected from noble metals, alloys of noble metals and mixtures thereof; (b) one or more selected inorganic binders and / or mixtures thereof, and dispersed in (c) organic medium, and wherein said glass compositions are immiscible or partially miscible with remnant glasses present in the low temperature co-fired ceramic substrate glasses at the firing conditions.The present invention is further directed to methods of forming multilayer circuits utilizing the above composition and the use of the composition in high frequency applications (including microwave applications).

Method for the microwave emulsion treatment of water-in-oil (W / O) emulsions, including a) determining, for an W / O emulsion the optimum conditions of the variables: water content, salt content, pH value of the aqueous phase, initial temperature, microwave application power, final temperature and drop size distribution to be adjusted in the industrial plant, as a function of the features of the tested crude oil such as viscosity, density, asphaltene content, total acidity, such conditions being those required for obtaining at least 90% separation efficiency of the emulsion in the presence of microwave radiation: b) utilizing such information for the initial adjustment of application conditions of the method to phase separation units in refineries and production units; c) perform on line tests of the variables of step a) of the process response in the streams effluent from separation units, being the response the water content and salt content tests, so as to feedback the information to the best adjustment of the process conditions for microwave application; and d) utilizing the on line or laboratory tests of the effect of the method as a tool for monitoring the efficiency of the breaking of the W / O emulsion.

Disclosed are synthetic garnets and related devices that can be used in radio-frequency (RF) applications. In some embodiments, such RF devices can include garnets having reduced or substantially nil Yttrium or other rare earth metals. Such garnets can be configured to yield high dielectric constants, and ferrite devices, such as TM-mode circulators / isolators, formed from such garnets can benefit from reduced dimensions. Further, reduced or nil rare earth content of such garnets can allow cost-effective fabrication of ferrite-based RF devices. In some embodiments, such ferrite devices can include other desirable properties such as low magnetic resonance linewidths. Examples of fabrication methods and RF-related properties are also disclosed.

A high-power microwave generator employing a plurality of inexpensive commercial magnetron tubes cross-coupled by means of a secondary coupling path between each magnetron output pair, whereby a portion of the output energy from a first magnetron tube is injected into a second magnetron tube and a portion of the output energy from the second magnetron tube is similarly injected into the first magnetron tube. The resulting cross-injection of microwave energies brings the respective magnetron tube pair into a phase-lock sufficiently stable to permit coherent combination of their outputs for many high-power microwave applications, such as directed energy weapon systems. The magnetron phase-locking system requires no external components other than the secondary coupling paths of this invention.

A novel ferroelectric ink comprising multiphase Barium Strontium Titanate (BST) in a polymer composite is described. The ink can be employed using direct-ink writing techniques to print high dielectric constant, low loss, and electrostatically-tunable dielectrics on substrates. The substrates can be flexible such as plastics or rigid, such as substrates comprising semiconductor materials or ceramics and the like. The dielectric ink is made by suspending pre-sintered nano / submicron-sized particles of BST in a thermoplastic polymer with a solvent. After printing with the ink, a low temperature curing process is performed at temperatures below 200° C., a temperature too low to sinter BST. Fully printed devices, such as a varactor and a phase shifter using direct ink writing methodologies are described.

A ferroelectric dielectric for microwave applications is provided comprising a polycrystalline perovskite phase of lead zirconate titanate dielectric material. Small grain size material is provided by a low temperature process, by a rapid thermal annealing process. A layer of amorphous ferroelectric precursor material is deposited and annealed in an oxygen containing atmosphere in the presence of water vapor, preferably with the addition of a few percent of ozone, and at a temperature of less than 500.degree. C. Advantageously, the method provides for formation of a ferroelectric material comprising lead zirconate titanate with a grain size less than 20 nm, with low film stress, high dielectric constant and low leakage current, which has excellent ferroelectric characteristics up to 10 GHz. This material has applications for capacitors, as filters, decoupling, coupling, and bypass elements and also for high frequency surface acoustic wave devices.

The invention discloses an MCP (microwave coupled plasma) resonant cavity, and belongs to the technical field of microwave application. The structure of the MCP resonant cavity comprises an outer conductor (1), a microwave antenna (2), an inner conductor (3), a sample inlet (7), a gas maintaining inlet (10), a gas shielding partition plate (11), a gas shielding inlet (12), a cooling ring (13), a gas shielding choke cone (14) and an impedance matching cone (15). The design of the MCP resonant cavity increases the power density of a plasma, and further increases the volume of a plasma torch, so that the bearing capability and the excitation capacity of a torch sample are stronger, a gaseous sample or an atomized water solvent sample and an organic solvent sample can be directly introduced to be measured. The MCP resonant cavity disclosed by the invention further has the characteristics of high stability, wide application range and the like.

A microwave applicator for heating loads being a waveguide transition between the rectangular TE10 and TE20 modes comprising a TE10 mode section and a TE20 mode section. The location of the load being inside said TE20 mode section and with its major axis perpendicularly to the major propagation direction of the TE20 mode, close to a shorting wall of said TE20 mode section and also close to the centreline of said propagation direction.

The invention relates to an industrial microwave application apparatus, and particularly relates to a side intake air microwave drying apparatus. According to the side intake air microwave drying apparatus the middle part of a box type structure acts as a microwave action cavity which is provided with a door body on one side, a microwave resource and the microwave action cavity are matched and separately distributed on the upper part of the box body; the microwave action cavity is provided with a tray and a tray holder; a power system is arranged on the lower part of the microwave action cavity in the box body, a motor of the power system is connected with the tray holder by a reducing mechanism in order to drive the tray to rotate by the tray holder; the side wall of the microwave action cavity is provided with an amount of air intake holes; and the top end of the box body is provided with a moisture pumping system which is communicated with the microwave action cavity. With the adoption of the independent box type structure, the side intake air microwave drying apparatus has the advantages of reasonable design, convenience for operation, easiness of installation, no special requirement to site and materials, and convenience for implementation and promotion.

Method for the microwave emulsion treatment of water-in-oil (W / O) emulsions, including a) determining, for an W / O emulsion the optimum conditions of the variables: water content, salt content, pH value of the aqueous phase, initial temperature, microwave application power, final temperature and drop size distribution to be adjusted in the industrial plant, as a function of the features of the tested crude oil such as viscosity, density, asphaltene content, total acidity, such conditions being those required for obtaining at least 90% separation efficiency of the emulsion in the presence of microwave radiation: b) utilizing such information for the initial adjustment of application conditions of the method to phase separation units in refineries and production units; c) perform on line tests of the variables of step a) of the process response in the streams effluent from separation units, being the response the water content and salt content tests, so as to feedback the information to the best adjustment of the process conditions for microwave application; and d) utilizing the on line or laboratory tests of the effect of the method as a tool for monitoring the efficiency of the breaking of the W / O emulsion.

The invention belongs to the technical field of microwave application, and specifically relates to a dual-probe differential device for online measuring the water content of microwave and a measuringmethod. The device consists of microwave probe units, a probe fixed seat, a sliding platform a lead screw guide rail unit, a servo motor unit and a signal display control unit. The dual-microwave probes are mounted on the probe fixed seat in the material conveying direction, the vertical height difference is 1 / 4 of microwave length, the dual-microwave probes are integrally fixed on the sliding platform in the lead screw guide rail unit, the servo motor is connected with the lead screw guide rail unit to control the movement of the sliding platform, the signal display control unit is used for controlling the servo motor to rotate so that the dual-microwave probes are positioned at the positions of phase position extreme points respectively; dual-probe data are collected through synchronousdelay for carrying out differential inversion operation processing so as to obtain water information of a measured material. According to the dual-probe differential device, the measurement accuracy is improved, and rapid non-damage detection for water content of materials such as cereals, gravels and chemicals on a conveyor belt can be realized.

This invention is related to thick film conductor compositions comprising electrically conductive gold powder, one or more glass frit or ceramic oxide compositions and an organic vehicle. It is further directed to the composition's uses for LTCC (low temperature co-fired ceramic) tape, for fabrication of multilayer electronic circuits and in high frequency microelectronic applications.

The invention discloses a microwave plasma igniter for an automobile engine, which belongs to the technical field of microwave application. The invention provides seven microwave plasma igniters with different structures for the automobile engine igniter, and achieves extreme field intensity at an exciter end by using an electromagnetism principle that the voltage amplitude is maximum at the end of a quarter coaxial resonator. A top structure at the end of an inner conductor can further enhance the field intensity, thereby breaking down surrounding oil gas mixture and generating the plasma and igniting. Afterwards the rapid movement of electrons of the plasma in a combustor quickly realizes the volume combustion of the whole combustor and full combustion of the oil gas mixture. The engine igniter provided by the invention has a similar external profile to the conventional spark plug, and can directly replace the conventional spark plug ignition system on the basis of not changing an engine cylinder structure. The work center frequency is 2.45GHz. The engine igniter is designed integrally, and has the characteristics of high efficiency, low cost, easy mass production and the like.

The invention relates to the technical field of microwave application and discloses a dielectric constant measuring device which is not only used for measuring dielectric constant of a solid dielectric material but also used for measuring corrosive chemical solution dielectric constant. The dielectric constant measuring device comprises a groove structure. Signal interfaces are arranged at two ends of the groove structure and used for connecting a testing instrument and transmitting a testing signal. A hole is formed in the groove structure and located in a groove and used for placing a container for containing tested materials. The hole is large enough in size so that the tested materials contained in the container matched with the hole can fully affect the transmission property of the groove structure. The dielectric constant measuring device is simple in structure and high in sensitivity. A double-interface measuring method can avoid multiple solutions and is favorable for improving measuring precision and speed. The dielectric constant measuring device can be used for measuring the corrosive chemical solution dielectric constant, can achieve broadband measuring and online measuring and has wide applicability.

A fusing device complemented by a microwave application.

The present invention is directed to a thick film composition for use in low temperature co-fired ceramic circuits comprising, based on weight percent total thick film composition: (a) 30-98 weight percent finely divided particles selected from noble metals, alloys of noble metals and mixtures thereof; (b) one or more selected inorganic binders and / or mixtures thereof, and dispersed in (c) organic medium, and wherein said glass compositions are immiscible or partially miscible with remnant glasses present in the low temperature co-fired ceramic substrate glasses at the firing conditions.The present invention is further directed to methods of forming multilayer circuits utilizing the above composition and the use of the composition in high frequency applications (including microwave applications).

A high-power microwave generator employing a plurality of inexpensive commercial magnetron tubes cross-coupled by means of a secondary coupling path between each magnetron output pair, whereby a portion of the output energy from a first magnetron tube is injected into a second magnetron tube and a portion of the output energy from the second magnetron tube is similarly injected into the first magnetron tube. The resulting cross-injection of microwave energies brings the respective magnetron tube pair into a phase-lock sufficiently stable to permit coherent combination of their outputs for many high-power microwave applications, such as directed energy weapon systems. The magnetron phase-locking system requires no external components other than the secondary coupling paths of this invention.

A high-performance, broad-band antenna that is small enough to be used in an array for biomedical imaging, yet has an aperture large enough to allow operations in the 1 GHz to 2.7 GHz frequency range. The present antenna advantageously uses a Vivaldi antenna with unique lobe designs to provide a small antenna that provides excellent near field imaging. The ends of each lobe have a tilted half-disc shape that increases the aperture of the antenna without increasing overall size. Other unique features of the lobes include exponential structures and an impedance matching design. Multiple units of the present antipodal Vivaldi antenna can be used in an array of antennas. Such an array, or stack or multiple arrays, can be used in many microwave applications for biomedical imaging.

The present invention related to devices and methods that use returned power (RP) measurements during microwave energy delivery to perform one or more functions. For example, microwave devices and systems that comprise one or more features to measure the returned microwave power. One or more measurements of the returned microwave power may be used to obtain information about one or more of: antenna shape, system status and system performance. One or more measurements of the returned microwave power shaping elements may also be used to obtain information about one or more properties of the target material. The invention also discloses devices and methods for delivering microwave energy to a variety of target materials to achieve a variety of desired microwave effects.

A direct coupled cup shaped microwave energy feeding antenna and array microwave heating device belong to the microwave application technology field, and relates to industrial microwave heating technology. The direct coupled cup shaped microwave energy feeding antenna comprises a microwave magnetron (1), an output coaxial line segment (4) and a cup shaped antenna; the cup shaped antenna is connected with the output coaxial line segment (4) eccentricly. The direct coupled cup shaped microwave energy feeding antenna array microwave heating device comprises: a direct coupled cup shaped microwave energy feeding antenna array which consists of several direct coupled cup shaped microwave energy feeding antennae arranged tightly and displaced. The direct coupled cup shaped microwave energy feeding antenna in the invention has a low input standing wave ratio and a high coupling efficiency; the microwave radiation pattern generated by the tightly displaced arranged antenna array benefits for large area uniform high efficiency heating application, and achieves low cost and convenient maintenance. The invention is suitable for asphalt concrete road construction and heating in road waintenance and road surface deicing.

A system for incorporating ferromagnetic materials into several microwave application is described. The system employs a multi-layer substrate. A substrate for receiving microwave signals uses a base layer which has tunable elements and a nanofiber layer which uses magnetic nanotubes. The nanofibers have a high aspect ratio and the nanofiber layer is embedded in the base layer.

The invention relates to a microwave application system of a remotely monitored LCC resonant converter, and belongs to the technical field of microwave application devices. The microwave application system comprises mainly an input rectifier filter circuit, a half-bridge LLC filament power supply circuit, an LCC resonant converter main circuit, RS-485 communication circuits, and the like; through two RS-485 buses, the microwave application system on the one hand receives data and commands from the host computer and executes, on the other hand reads various electric parameters measured by the electrical parameter measurement module, to achieve the remote control; using the half-bridge LLC filament power supply circuit, the microwave application system achieves the direct current power supply of the filament. The microwave application system adopts the Internet of things technology using the microprocessor as the core, to achieve the remote monitoring of the microwave application devices, the operator can not only be far away from the microwave, but also simultaneously control more than one microwave application devices; through the mechanism of combining the LLC soft-switch technology with the synchronous rectification technology, the electronics issued by the magnetron cathode are more uniform, and the system stability of the microwave application devices is enhanced.

This invention is directed to pure and modified Ta2O5 thin films deposited on suitable substrate and methods for making these Ta2O5 thin films. These Ta2O5 thin films exhibit superior properties for microwave communication, dynamic random access memory and integrated electronic applications. The Ta2O5 thin films perform well in these types of technologies due to the Ta 2O5 thin film component which allows for high dielectric constants, low dielectric loss, and good temperature and frequency stability, thus making them particularly useful in high frequency microwave applications.

The invention relates to a microwave water content measurement device and a measurement method based on space traveling standing wave attenuation, and belongs to the technical field of microwave applications. The device is composed of a microwave transmitting probe, a sample container, a measured material, a microwave receiving probe, a sliding platform, a lead screw guide rail unit, a motor unit,a weight monitoring unit and a signal display control unit. The sample container of the device is located between the microwave transmitting probe and the microwave receiving probe; the microwave receiving probe is fixed on the sliding platform of the lead screw guide rail unit, and can move freely in the horizontal direction to realize continuous measurement of space standing wave signals. The signal display control unit establishes a water content inversion formula based on the power attenuation of traveling wave antinodal points, and eliminates measurement errors caused by multiple reflection effects. The microwave water content measurement device based on the space traveling standing wave attenuation provided by the invention improves the measurement accuracy, makes a measurement result not affected by the material thickness and the bulk density, and can realize the fast, non-destructive measurement of the water content of granular materials such as grains, feeds, woods, gravels and the like.