21 results about "Microwave propagation" patented technology

The invention discloses a parameter optimization method based on an evaporation waveguide and troposphere scattering mixed channel, and the method comprises the steps: calculating the loss of a microwave propagation path through simulating a near sea surface evaporation waveguide and troposphere scattering environment in combination with an evaporation waveguide model, a troposphere scattering model, an atmospheric absorption attenuation model and a parabolic equation model; and obtaining the optimal transmitting antenna height, the optimal receiving antenna height and the optimal electromagnetic wave frequency under the evaporation waveguide and troposphere scattering mixed channel by using the target function and a global optimization algorithm. The method disclosed by the invention can adapt to application scenes such as complex offshore beyond visual range communication, can provide a flexible optimization scheme for different offshore propagation conditions and distances, and realizes all-weather beyond visual range communication by combining the advantages of an evaporation waveguide channel and a troposphere scattering channel; the influence of communication system parameters on electromagnetic wave propagation under an evaporation waveguide and troposphere scattering mixed channel can be effectively reflected, the loss of an electromagnetic wave propagation path is remarkably reduced, and the reliability of signal transmission is improved.

The invention relates to the technical field of antennas, and discloses a reconfigurable transflective array antenna applied to non-line-of-sight microwave propagation, which comprises a control circuit, and a first polarization grid layer, a first dielectric layer, M * N resonant sheets, a second dielectric layer and a second polarization grid layer which are sequentially arranged, the resonance piece comprises a radiation part, a grounding wire, four extension parts and two PIN diodes, the four extension parts are symmetrically arranged on the periphery of the radiation part and are connected with the radiation part, and the two PIN diodes are respectively arranged on two adjacent extension parts and are respectively connected with the upper polarization grid layer and the lower polarization grid layer through bending wires on the extension parts and metal columns in the dielectric layer; one end of the grounding wire is connected with the radiation part, and the other end is connected with direct-current ground; and the control circuit controls the connection and disconnection of the PIN diode through the polarization gate layer to realize a transmission mode or a reflection mode. The reconfigurable transflective array antenna applied to non-line-of-sight microwave propagation is relatively simple in structure, and loss can be reduced.

The invention provides a multi-reflection superposition enhanced microwave displacement measurement method and system, and the method comprises the steps: S1, constructing a microwave multi-reflection propagation path, enabling a microwave radar to transmit electromagnetic waves to the microwave multi-reflection propagation path as a transmission signal, and receiving a corresponding echo signal; s2, extracting length change information of a microwave multi-reflection propagation path according to the echo signal; s3, establishing a linear superposition relation model between the total length of the microwave propagation path and respective displacements of W reflection surfaces in the microwave multi-reflection propagation path; w2; and S4, based on the linear superposition relation model, displacement information of the corresponding reflection surface is obtained and output. According to the invention, a larger phase variation can be obtained under the condition of small displacement or weak vibration, so that the measurement sensitivity is improved and the signal-to-noise ratio is improved.

The invention discloses a regional evaporation waveguide prediction method based on path loss inversion, and relates to the technical field of maritime communication. Actual measurement path losses corresponding to the multiple propagation signals are obtained through a point-to-point microwave propagation link, inversion is carried out on the actual measurement path losses corresponding to the multiple propagation signals, and the long-time-sequence evaporation waveguide height is obtained; taking the long-time-sequence evaporation waveguide height and the corresponding long-time-sequence meteorological and hydrological characteristics as a training sample set, training a recurrent neural network, and obtaining an evaporation waveguide height prediction model; the meteorological and hydrological characteristics comprise wind speed, air temperature, humidity, sea surface temperature, evaporation capacity, atmospheric pressure and rainfall capacity; predicting an evaporation waveguide height prediction value of each grid point in the target area through an evaporation waveguide height prediction model; and generating continuous regional evaporation waveguide height distribution through inverse distance weighted interpolation according to the evaporation waveguide height prediction value of each grid point in the target region. The method improves the prediction accuracy of the regional evaporation waveguide.

This invention discloses a microwave detection method for wellbore rock humidity in gas drilling, comprising the following steps: S1: Establishing a near-bit annular space microwave propagation model based on the annular structure of the gas drilling well and the properties of the rock wall interface; S2: Establishing a microwave reflection coefficient calculation model for the wellbore rock wall interface based on the near-bit annular space microwave propagation model; S3: Establishing a quantitative calculation model for the change in microwave reflection coefficient of the wellbore rock wall under low humidity conditions near the drill bit, based on the microwave reflection coefficient calculation model; S4: Establishing a simulation model for microwave reflection of the wellbore rock wall under low humidity conditions based on the quantitative calculation model; S5: Performing simulations across the entire frequency band according to the simulation model to determine the most reasonable band for the microwave detection method of wellbore rock humidity in gas drilling. This invention enables effective ultra-fast dynamic monitoring of humidity changes during drilling in low humidity ranges.

The objective of the present invention is to provide a plasma processing device that generates an axially symmetrical electric field distribution under a wide range of conditions without actively allowing microwave energy to be lost other than for the generation of plasma, and to enable uniform processing. To this end, the plasma processing device comprises a septum polarizer (15) that allows microwaves that have propagated via a circulator (12) to propagate to a processing chamber, wherein: one port of the circulator (12) is connected to each of one port of the septum polarizer (15) and the other port of the septum polarizer (15), and the other port of the circulator (12) is connected to a high-frequency power supply; and the one port of the septum polarizer (15) is a port for converting the propagated microwaves to right-handed circularly polarized waves, and the other port of the septum polarizer (15) is a port for converting the propagated microwaves to left-handed circularly polarized waves.

Provided are an outer conductor 29 as a conductive waveguide having an opening 34 at a first end, a first dielectric 31 extending along a main axis of the outer conductor 29 in an interior of the outer conductor 29, connected to a microwave supply cable 5 that supplies microwaves, and configured to propagate the supplied microwaves to the first end side, and a second dielectric 33 arranged so as to close the opening 34 and configured to generate plasma with use of the microwaves propagated by the first dielectric 31.

The present application relates to meteorological detection and environmental monitoring technical field, specifically to microwave rain measurement environmental noise recognition method based on feature fingerprint library matching, including obtaining aliasing signal containing rainfall echo and environmental noise and extracting radar detection metadata, then by introducing non-negative and sparse constraint, and taking system impulse response as prior information, applying deconvolution processing to separate aliasing signal into independent signal components with high precision; Parallel processing signal scaling, echo gating and space-time alignment, etc. to the separated signal components, construct rain measurement link view, and extract features from it to generate rain measurement binding fingerprints bound with metadata; By matching the fingerprint with the pre-constructed rain measurement environmental noise fingerprint library based on microwave propagation path perception and combining the rainfall physical mechanism constraint to weigh the multi-source evidence, the noise type is identified, and the pure rain measurement signal is obtained. The present application realizes the recognition of microwave rain measurement environmental noise through deconvolution processing.

The invention is applicable to the technical field of microwave detection, and provides a microwave-based object detection imaging method and system, which comprises the following steps: acquiring microwave signal emission data, and acquiring a microwave propagation speed through a microwave type; microwave signal receiving data are obtained, the microwave signals are received through a receiver, the received data are processed, the processing modes comprise filtering, amplifying and denoising, and the processed data are sent to a terminal; performing imaging processing on the article according to the summarized information, obtaining electromagnetic characteristics of different materials, obtaining microwave signal reflection data, and determining a material type and an article structure according to the reflection data and the electromagnetic characteristics; the method comprises the following steps: acquiring multi-angle microwave data, performing three-dimensional reconstruction through the multi-angle microwave data, a material type and an article structure, and sending a three-dimensional reconstruction result to a terminal, thereby solving the problem that in the existing microwave imaging process, microwave signals cannot be processed to analyze the article structure and surface smoothness; and more real performance cannot be realized during three-dimensional imaging.

In order to provide a plasma processing device which generates an axially-symmetric electric field distribution under various conditions and enables uniform processing without actively losing microwave energy other than through plasma generation, this plasma processing device is configured as below.　The plasma processing device further comprises a septum polarizer for propagating, to a processing chamber, a microwave having been propagated via a circulator. One port of the circulator is connected to one port of the septum polarizer and the other port of the septum polarizer via an impedance matching unit. The other port of the circulator is connected to a high frequency power source via an impedance matcher. The one port of the septum polarizer is a port that converts the propagated microwave to a right-hand circular polarization wave. The other port of the septum polarizer is a port that converts the propagated microwave to a left-hand circular polarization wave. The impedance matching unit has specified dimensions so that the impedance matching of the propagated microwave is achieved.

A component carrier includes a stack with at least one electrically conductive layer structure and at least one electrically insulating layer structure, and a microwave structure embedded at least partially in the stack. The microwave structure configured for exciting a microwave propagation mode and having at least two stack pieces being interconnected with each other at an electrically conductive connection interface.

The invention relates to the technical field of meteorological detection and environmental monitoring, in particular to a microwave rain measurement environmental noise identification method based on feature fingerprint database matching, which comprises the following steps: acquiring aliasing signals containing rainfall echoes and environmental noise and extracting radar detection metadata, and then extracting radar detection metadata by introducing non-negative and sparse constraints and taking system pulse response as prior information. The aliasing signals are separated into independent signal components in a high-precision mode through deconvolution processing; performing parallel processing such as signal calibration, echo gating and space-time alignment on the separated signal components, constructing a rain measurement link view, and extracting features from the rain measurement link view to generate rain measurement binding fingerprints bound with metadata; the fingerprint is matched with a pre-constructed rain measurement environment noise fingerprint database based on microwave propagation path perception, multi-source evidence tradeoff is carried out in combination with rainfall physical mechanism constraints, the noise type is identified, and a pure rain measurement signal is obtained. According to the method, microwave rain measurement environment noise identification is realized through deconvolution processing.

A microwave generator is connected with a waveguide, a coil is installed in the waveguide, and the microwave generator is connected with the coil in the waveguide in series through a wire. During working, the microwave generator transmits microwaves into the waveguide tube through the antenna, when the microwaves reach the first coil, the wire transmits microwave electric signals to the first coil and generates a magnetic field, and due to the fact that the phases of the microwaves and the first coil are always the same, attraction force is generated. And when the magnetic field of the first coil is transmitted to the antenna of the microwave generator in the opposite direction, the phase difference between the waveform emitted by the microwave and the waveform returned by the first coil is pi / 2, and the interaction force generated between the antenna and the first coil has the same direction, so that unidirectional power is provided for the system. The method has the beneficial effects that the direction of the counter-acting force is changed by utilizing the time difference of microwave propagation, the defect that an aerospace engine depends on spraying substances is overcome, and a new scheme is provided for aerospace development.

The application discloses a regional evaporation duct prediction method based on path loss inversion, and relates to the technical field of maritime communication. A plurality of measured path losses corresponding to a plurality of propagation signals are obtained through a point-to-point microwave propagation link, and the plurality of measured path losses corresponding to the plurality of propagation signals are inverted to obtain long-time evaporation duct heights; the long-time evaporation duct heights and corresponding long-time meteorological and hydrological characteristics are taken as a training sample set to train a recurrent neural network to obtain an evaporation duct height prediction model; the meteorological and hydrological characteristics include a wind speed, an air temperature, a humidity, a sea surface temperature, an evaporation amount, an atmospheric pressure and a rainfall amount; an evaporation duct height prediction value of each grid point in a target region is predicted through the evaporation duct height prediction model; and a continuous regional evaporation duct height distribution is generated through inverse distance weighted interpolation according to the evaporation duct height prediction value of each grid point in the target region. The method improves the prediction accuracy of the regional evaporation duct.

The invention discloses a tobacco microwave dryer and a control method thereof, and the tobacco microwave dryer comprises a housing which is internally provided with a shielding cavity; the partition plate is arranged in the shielding cavity so as to divide the shielding cavity into a drying cavity for containing tobacco and a mounting cavity, and a microwave antenna is arranged in the mounting cavity; the microwave antenna comprises a micro-strip feeder line extending in the direction close to the drying cavity, the extending end of the micro-strip feeder line is connected with an emitting part expanding outwards in the radial direction, the emitting part is provided with a first surface facing the drying cavity and parallel to the partition plate, and the first surface emits microwaves to the drying cavity. The tobacco drying device has the beneficial effects that the emitting part which is parallel to the partition plate and has a certain area is arranged in the mounting cavity, so that microwaves are directionally propagated into the drying cavity in a manner of being perpendicular to the first surface and can directly pass through tobacco without being reflected by the wall of the cavity, the energy loss in the microwave propagation process is reduced, and the tobacco drying efficiency is improved. Therefore, the heating and drying efficiency of the tobacco microwave dryer is improved, and the heating and drying time is shortened.

The utility model relates to the technical field of household appliances, and discloses a cooking device which comprises an inner container, a heating device and a heating device. The magnetron is positioned outside the cooking cavity and is used for generating microwaves; the waveguide box is positioned between the cooking cavity and the magnetron and is used for guiding the microwaves from the magnetron into the cooking cavity; a microwave inlet is formed in one end of the waveguide box, a microwave outlet is formed in one side face of the waveguide box, and a first convex hull is arranged on the inner side wall, opposite to the microwave outlet, of the waveguide box; the waveguide box between the first convex hull and the microwave inlet is provided with a convex cavity formed by protruding towards the outer side; the stirring antenna assembly is used for transmitting the microwaves guided by the waveguide box into the cooking cavity. According to the cooking equipment and the waveguide box, by designing the convex cavities and the first convex hulls, microwaves can be effectively gathered, microwave energy can be efficiently and directionally reflected and guided to be output from the microwave outlet, the transmission efficiency of the microwave energy is remarkably improved, and the heating performance of the cooking equipment is improved.

The invention provides a polarization conversion unit and a reconfigurable polarization converter, and belongs to the technical field of microwave propagation, the polarization conversion unit comprises a top-layer metal covering surface, an intermediate-layer dielectric substrate and a bottom-layer metal covering surface, and the top-layer metal covering surface and the bottom-layer metal covering surface have the same structure; the top-layer metal covering surface is positioned on the upper surface of the middle-layer dielectric substrate, and the bottom-layer metal covering surface is positioned on the lower surface of the middle-layer dielectric substrate; the top metal covering surface comprises a first metal patch and a second metal patch which are orthogonal to each other; the first metal patch and the second metal patch are respectively provided with a plurality of PIN diodes. The first metal patch and the second metal patch which are orthogonal to each other form a cross-bar-shaped anisotropic structure, and can serve as a metal bias line when the PIN diode is in a conduction state, so that the polarization conversion unit has the functions of regulating and controlling electromagnetic waves and the PIN diode at the same time, the metal bias line does not need to be independently arranged for the PIN diode, and the cost is reduced. And the structure of the polarization conversion unit is simplified.

The present application relates to the field of high-temperature superconductivity, and in particular to a device and method for detecting the critical current density of a high-temperature superconducting film, comprising a vector network analyzer, a waveguide, a coil unit, and a low-temperature sample stage arranged in sequence along the direction of microwave propagation, and also comprising a data acquisition and analysis system connected to the vector network analyzer in communication, the high-temperature superconducting film to be tested is placed on the low-temperature sample stage, and the coil unit is used to generate an alternating magnetic field according to different currents to stimulate the internal part of the high-temperature superconducting film to be tested to generate a superconducting current, so that the high-temperature superconducting film to be tested changes from a superconducting state to a non-superconducting state, and the reflection coefficient of microwaves is detected by the vector network analyzer to monitor the change of the critical state of the high-temperature superconducting film, thereby detecting the critical current density. The device can solve the technical problems faced by the prior art, such as low resolution and unreliable measurement.

The invention discloses an intelligent regulation and control method and system suitable for SF6 waste gas microwave plasma treatment, and relates to the technical field of intelligent regulation and control, and the method comprises the steps: carrying out the region division of an SF6 waste gas treatment cavity, constructing and designing a particle and energy balance model, updating the particle concentration and energy density, and carrying out the calculation of the particle concentration and energy density. Analyzing free space path loss to calculate a large-scale fading coefficient, analyzing random fluctuation in a microwave propagation process to calculate a small-scale fading coefficient, and further calculating comprehensive attenuation. According to the method, through calculation of the comprehensive attenuation coefficient, random fluctuation and physical propagation conditions are considered at the same time, so that the system can still accurately reflect microwave transmission characteristics under different working conditions, and the real evolution trend of reaction gas is learned through a differential equation of continuous time; temperature and concentration nonlinear fluctuation caused by microwave input, gas flow and discharge intensity change is captured.

This invention relates to a hybrid waveguide inversion method based on microwave path loss. By establishing a point-to-point microwave link, employing multiple transmitting and receiving antennas at various altitudes, multiple monitoring frequencies, and multiple monitoring locations, and combining system parameters, the path loss of microwave propagation at different antenna altitudes, frequencies, and distances along the link is calculated. Then, a hybrid waveguide profile is established on the link. Using electromagnetic wave propagation models, objective functions, and optimization algorithms, a hybrid waveguide profile including surface waveguides and evaporating waveguides is obtained. This method acquires multiple hybrid waveguide profiles, improving the performance evaluation accuracy of marine electromagnetic systems and enabling the inversion of hybrid profile characteristics of evaporating waveguides and surface waveguides.

The invention discloses a human trunk thermotherapy device with a radio frequency radiator array, and relates to the technical field of medical instruments, the human trunk thermotherapy device comprises a microwave thermotherapy machine, the microwave thermotherapy machine comprises a machine body, the two sides of the inner cavity of the machine body are provided with control panels, the front side of the machine body is provided with a mobile station, the inner cavity of the machine body is provided with a reflection mechanism, and the reflection mechanism is provided with a radio frequency radiator array. According to the human body trunk thermal therapy device with the radio frequency radiator array, the reflection unit is arranged, the microwave radiator is started through an external power source, the microwave radiator transmits microwaves to the surface of a patient, due to the fact that the coverage range of the microwave radiator is large, part of the microwaves can be lost, and the microwave radiator can be used for thermal therapy. Loss microwaves are reflected through the first reflecting plate and prevented from being dissipated in the surrounding environment, the microwaves reflected through the first reflecting plate can make contact with the surface of the second reflecting plate, the microwaves are reflected back to the body surface of a patient through the second reflecting plate, and therefore the thermal therapy effect is improved.