64 results about "Electromagnetic propagation" patented technology

The present invention provides a method and apparatus for non-invasive reduction of excessive fat tissue by externally applying radio frequency (RF) electromagnetic (EM) waves adjusted to specific fat cells absorption frequency and electromagnetic propagation mode. Based on the performed experiments described further, the method and working apparatus has been invented that reduces fat layers without any medication, non-invasively through the intact skin. The invented method and apparatus facilitates the safe fat removal, and may lead to reduction and eradication of obesity and obesity associated diseases.

A device and method for obtaining an electromagnetic propagation measurement of a subterranean geologic formation, with the formation being intersected by a borehole. The device comprises a transmitter for transmitting an electromagnetic signal, and a first and second receiver for receiving the transmitted signal. The device further comprises a circuit for injecting a calibration signal into the first receiver and the second receiver, and a processor for processing the uncalibrated receiver signal and the calibration signal to obtain electromagnetic propagation measurement that is free from errors introduced by the receiving elements of the system. The processor may include a receiver data acquisition circuit for correcting data acquisition errors related to the first receiver and the second receiver.

A method and apparatus for sensing conditions in a subsurface geologic formation heated for the extraction of hydrocarbons is disclosed. A time domain reflectometer in conjunction with an open wire transmission line is employed in real time to determine impedance discontinuities in the geologic formation. These impedance discontinuities correspond to physical conditions in the geologic formation. The open wire transmission line can include pipes running into the subsurface geologic formation or other conductors, including a split tube well casing. The method may operate in the low frequency window for subsurface electromagnetic propagation.

The invention provides a high-gain dielectric resonator antenna applied to a 60 GHz millimeter wave communication system, belongs to the technical field of electromagnetic propagation and receiving and provides a high-gain dielectric resonator antenna based on an H-shaped slot fractal uniplanar compact electromagnetic bandgap (HSF-UC-EBG) structure. The specific implementation is that a circle of HSF-UC-EBG structure is loaded around a radiating main body of a dielectric resonator antenna; and the high-gain dielectric resonator antenna is characterized in that the gain in a working frequency range of the antenna is effectively improved under the conditions of keeping size and section of the dielectric resonator antenna unchanged. The designed high-gain HSF-UC-EBG dielectric resonator antenna can be used in the 60 GHz millimeter wave communication system and provides guidance for designing a high-gain antenna which works in a high-frequency system.

The invention relates to an implementation method of a multi-frequency-band UC-EBG (Uniplanar Compact Electromagnetic Band Gap) structure and belongs to the technical field of electromagnetic propagation and reception. According to the method provided by the invention, an H-type groove is arranged on a unit paster, so as to design a four-frequency-band H-type groove UC-EBG structure within a frequency range of less than 60GHz; the invention also provides a method for realizing the miniaturization of the structure by increasing the groove length w of the H-type groove, decreasing the groove width a and increasing the dielectric constant epsilon of a dielectric substrate and the like. In addition, the method provided by the invention can be used for further realizing the miniaturization of the EBG structure by introducing an H-type groove primary fractal structure, and designing the four-frequency-band H-type groove UC-EBG structure within a frequency range of less than 3 GHz by enlarging the structure through the period unit size SF (Scale Factor). The implementation method provided by the invention can be used for solving the problem that the EBG structure has less possibility of realizing multiple frequency bands in a lower frequency because of the size restriction and providing guidance for the specific design of a multi-frequency-band miniaturized electromagnetic band-gap structure.

The invention provides a high-gain antenna which can simultaneously work at two frequency bands of 2.45 GHz and 5.8GHz and a method for realizing the high-gain antenna, which belong to the technical field of electromagnetic propagation and receiving. A double-frequency high-gain coaxial feed patch antenna provided by the invention comprises a rectangular thin metal patch, a metal earth plate and two EBG (electromagnetic band gaps) coatings. The method specifically comprises steps of loading the EBG coatings right above the coaxial feed patch antenna. The coaxial feed patch antenna is characterized in that a loaded EBG coating structure has specific dimensions and arrangement, and a specific distance is left between the two EBG coatings and a metal earth plate of the antenna. The gains of two working frequency bands of the antenna are effectively increased through the loaded EBG coating structures; and moreover, the EBG coating structures and the patch antenna can be respectively designed, and a double-frequency high-gain antenna designing process is simplified. The antenna provided by the invention can work at two frequency bands of 2.45 GHz and 5.8GHz and is particularly suitable for application occasions with high directional requirements. Guidance is provided for designing the multi-frequency high-gain antenna through utilizing the method provided by the invention.

The invention provides a novel data label and data reading-writing system and method of the data label. The data reading-writing method of the data label is namely LID (Luminous Intensity Distribution) optical recognition technology. The data label is a passive device, comprising a photoelectric detector, a power managing circuit, a photo-cell, a data storage and a light emitter; the output end of the photo-cell is connected with the input end of the power managing circuit; the photoelectric detector is used for detecting a photosignal, converting the photosignal into an electric signal after receiving the photosignal from a reader-writer, and reading and writing the data storage according to an instruction in the electric signal; the light emitter is used for converting the data read from the data storage into the photosignal. According to the novel data label and the data reading-writing system and method of the data label, the data label is read and written through the photosignal, the directionality of the photosignal propagation is not involved with radio-frequency radiation, so that the data label is able to recognize signal target, and avoid electromagnetic propagation loss or interference or monitoring, and as a result, the safety and reliability are improved, and the applicable scope is expanded.

The invention provides an ultra wideband antenna-oriented uniplanar compact electromagnetic bandgap (UC-EBG) structure and a design method thereof, and belongs to the technical field of electromagnetic propagation and receiving. When five anisotropic H-shaped slot fractal (HSF) UC-EBG periodic units designed by the invention are arranged in x1 direction, the bandgap is 1.30-2.58 GHz; when the five anisotropic HSF UC-EBG periodic units designed by the invention are arranged in y1 direction, the bandgap is 2.57-4.31 GHz; and when the units which are arranged in the x1 direction and the y1 direction are crosswise arranged, a formed quasi homonymous crossed HSF-UC-EBG structure has similar bandgap characteristics in two orthogonal directions (set as x2 and y2 directions), the bandgaps are 1.40-4.93 GHz and 1.37-4.93 GHz respectively, and the relative bandgap reaches up to 111.0 percent. The ultra wideband HSF-UCEBG structure provided by the invention can be actually used in an ultra wideband antenna of a corresponding frequency band, so that the problem of difficulty of applying the conventional UC-EBG structure to a wideband system due to narrow relative bandwidth (generally 5-27 percent) is solved.

A method and apparatus for sensing conditions in a subsurface geologic formation heated for the extraction of hydrocarbons is disclosed. A time domain ref lectometer (10) in conjunction with an open wire transmission line (12, 14) is employed in real time to determine impedance discontinuities in the geologic formation. These impedance discontinuities correspond to physical conditions in the geologic formation. The open wire transmission line can include pipes running into the subsurface geologic formation or other conductors, including a split tube well casing. The method may operate in the low frequency window for subsurface electromagnetic propagation.

The invention belongs to the technical field of electronic and scientific application, and discloses a large-volume chaff cloud electromagnetic scattering measurement method based on a partition vector transport theory. The large-volume chaff cloud electromagnetic scattering measurement method includes the steps: calculating the distribution of chaff clouds in wake flow in combination with an aerodynamic theory; based on the chaff cloud space distribution model, using a K-means algorithm to carry out rapid partitioning processing on the chaff cloud space distribution model, and using a linearmoment method to calculate an electromagnetic propagation attenuation coefficient in each subarea; based on the partition data and the obtained intra-area propagation attenuation coefficient, establishing a vector transport equation in the whole space area occupied by the chaff cloud, solving the vector transport equation by using a Monte Carlo method, and solving a statistical solution of the vector transport equation by using the emitting, transporting, colliding, tracking and receiving processes of the virtual photons; and based on a solving result of the vector transport equation, obtaining scattering HH, HV, VV and VH polarization modes through Stokes vector transformation processing. According to the large-volume chaff cloud electromagnetic scattering measurement method the problem of low calculation efficiency of the scattering cross section of the large-volume chaff cloud radar in the prior art is solved, and meanwhile, the problem of calculation of the scattering cross sectionof the chaff cloud radar in the aircraft wake flow is effectively solved.

The embodiment of the invention discloses a multi-operator-based wireless network site planning method and device, relates to the technical field of wireless communication network planning, and aims to increase the utilization rate of a site. The method comprises the following steps: performing automatic site planning based on an electromagnetic propagation prediction method specific to a first communication system on the basis of a first site set in order to obtain a second site set satisfying a first condition; and performing automatic cell optimization based on the electromagnetic propagation prediction method specific to a communication system planned to be built by a single operator in the site planning area in order to screen a site set of the single operator satisfying a second condition from the second site set. The multi-operator-based wireless network site planning method and device in the embodiment of the invention are applied to site planning.

A method of determining the dielectric constant of a formation, comprising acquiring phase-related and amplitude-related measurements for electromagnetic signals propagating though the formation from a transmitter to a receiver; deriving a complex-valued quantity comprising terms relating to the phase shift and attenuation of the signals; defining a one-component complex-valued relationship relating the phase shift, attenuation and complex dielectric constant; and using the derived complex-valued quantity in the defined relationship to obtain a calculated value of the complex dielectric constant. An apparatus for determining the dielectric constant of a formation, comprises a transmitter for transmitting electromagnetic signals into the formation; a receiver for receiving the electromagnetic signals that have propagated from the transmitter through the formation; and means for determining the dielectric constant of the formation in accordance with a method according to the first aspect of the invention.

The invention relates to a microwave circuit technology, in particular to a substrate-integrated waveguide equalizer. Two grooves penetrating through a metal layer are formed in an SIW body at equal intervals along an electromagnetic propagation direction, an energy consumption original piece-resistance thin film is introduced, and the loss of a propagation channel is increased; and when an electromagnetic wave is propagated in the SIW body in a TE1.0 mode, a signal can be attenuated to a certain extent as well as the TE1.0 mode is propagated in surface resistance film, and the attenuation isclosely related to a working frequency. The surface resistance of a side wall part of the SIW body can be divided into two parts comprising a first region, a second region and a third region, the insertion loss difference between a high-frequency point and a low-frequency point can be increased with increase of k at the first region, and the insertion loss difference between the high-frequency point and the low-frequency point can become small with increase of k at the second region and the third region. The SIW equalizer structure can be used in micro-wave or millimeter-wave circuit and system, and different attenuation is performed on signals at different frequencies.

The invention discloses an electromagnetic propagation resistivity logging joint inversion method based on parallel computing technology. The method comprises following steps of A: loading electromagnetic propagation resistivity logging data; B: performing smooth filtering and automatic layering for logging curves; C: selecting stratum model invasion depth and invasion electrical resistivity according to curve separation degree; D: calculating electromagnetic propagation resistivity logging response of corresponding depth points of measured curved by use of the limited element method based on multinuclear parallel or GPU parallel computing technology; and E: calculating a relative error of the forward simulation response value and measured data, outputting the model value to be the inversion result if the relative error is smaller than a set threshold value, and if not, calculating variable quantity of the model, resetting stratum model parameter, and returning to the step D until outputting the reversion result according to the Marquette iterative algorithm. According to the invention, the method is quick inversion calculating speed, high in precision, suitable for server invasion of mud, and capable of providing technical support for storage layer evaluation and pollution level evaluation of the storage layer.

The invention discloses an absorbing / scattering-integrated stealth metamaterial, which belongs to the technical field of stealth materials. The absorbing / scattering-integrated stealth metamaterial comprises a second metamaterial layer, a third substrate, a first metamaterial layer, a fourth substrate and a metal plate bottom layer sequentially arranged along an electromagnetic propagation direction, wherein the first metamaterial layer comprises a first substrate, an artificial microstructure arranged on the first substrate, and a first absorbing metamaterial printed on the first substrate; the second metamaterial layer comprises a second substrate and a second absorbing metamaterial printed on the second substrate; and positions of a second artificial microstructure unit and the first artificial microstructure unit are corresponding. Comprehensive control on absorbing and scattering can be realized, and through optimizing the structural design, the absorbing metamaterial and the supersurface can be effectively combined, and the frequency bands of the two are expanded; and due to the ultra-wideband, efficient reduction, lightweight and ultra-thin characteristics, the absorbing / scattering-integrated stealth metamaterial has higher value in practical application.

The invention discloses an electromagnetic radiation situation awareness prediction method and system in a complex electromagnetic environment. The method comprises the following steps: S1, giving a situation awareness prediction scene; S2, establishing a local coordinate system, and determining a mapping relation between the longitude and the latitude of the airplane in the local coordinate system; S3, setting the position and direction of the receiving antenna on each airplane relative to the airplane, and setting the position and direction of the transmitting antenna on each ship relative to the ship; S4, extracting antenna far-field gain data from the far-field pattern of the antenna; S5, generating the position and direction of the aircraft at each moment; S6, generating field intensity distribution on the vertexes of the regional grids; S7, calculating space loss L; S8, dynamically displaying the field distribution in the area along with the propulsion of the simulation moment; S9, calculating a transmitting antenna gain and a receiving antenna gain; S10, calculating the sensing power of each airplane. According to the invention, the problem that the traditional electromagnetic propagation model does not consider the spatial gain distribution of the antenna and cannot calculate the change of electromagnetic propagation along with time is solved.

Devices, systems and methods are disclosed which relate to reproducing and testing a simulation of electromagnetic propagation of multiple Radio Frequency (RF) jammers in an environment to determine the effectiveness of the jammer configuration. In some configurations, a multi-jammer simulator renders the electromagnetic propagation of a multiple jammer scenario, including multiple RF jammers onboard vehicles traveling through the environment, and records a multi-waveform output of the multiple jammer scenario to a recordable medium. A multi-waveform generator reads the multi-waveform output from the recordable medium and physically reproduces a plurality of waveforms consistent with the multi-waveform output. The plurality of waveforms is substantially similar to a physical reproduction of the multiple jammer scenario. An RF receiver, placed within a range of effectiveness of the multi-waveform generator, attempts to receive a signal from an RF transmitter during reproduction of the multi-waveform output. Results are recorded in the form of successes and failures associated with the attempts and compared with results from the simulation.

A device for acquisition of particles present in a sample includes a spatially coherent light source, an optical system, and an image sensor placed in the focal plane of the optical system. The image sensor is configured to capture an intensity image. A computational unit of the device is configured to construct a series of electromagnetic propagation matrices obtained for a plurality of defocusing offsets relative to a plane of focus of the optics. The computational unit is also configured to determine a first average focused electromagnetic matrix for the particles from the series of electromagnetic matrices, identifying at least one of the particles in the first electromagnetic matrix and storing the coordinates of said particle, and determining a second electromagnetic matrix at a distance of focus on a particle identified from the components of the series of electromagnetic matrices having the stored coordinates.

Identifying the dielectric constant and / or the electrical resistivity of part of a geological formation may reveal useful characteristics of the geological formation. This disclosure provides methods, systems, and machine-readable media to determine dielectric constant or electrical resistivity, or both, using contraction mapping. Specifically, contraction mapping may be used with a function of wavenumber k to iteratively solve for values of dielectric constant and electrical resistivity until convergence is achieved. This may allow for convergence to a solution without computing partial derivatives and / or with fewer iterations than previous techniques.

The invention relates to an electromagnetic solving method for particle launching simulation. The electromagnetic propagation is simulated by the motion of particles, and the density of particles represents electromagnetic energy. Each particle has the attributes of position, velocity, total displacement distance, interval angle, lifetime, existence and the like, and the particles follow the electromagnetic reflection and diffraction laws. In this way, the rendering of particles can be visualized; space can be partitioned according to the required resolution, the number of particles in a grid can be counted, and the electromagnetic energy of the point can be solved; the motion of particles represents the diffusion of irradiation, and the calculation of diffusion factor can be omitted. The electromagnetic solving method has the characteristics of high accuracy, simple and visual method and high degree of parallelism, and can be applicable to various electromagnetic calculation solving and visualization systems.

The invention belongs to the technical field of antennas, particularly relates to a method for calculating a wing shielding effect based on a diffraction principle, and discloses a method for calculating a wing shielding effect based on a diffraction principle. The core of the design method is that the UTD is simplified by an electromagnetic propagation shielding algorithm based on a Fresnel zonetheory, and the complexity of ray tracing is reduced. Then, on the basis, establishing an electromechanical coupling model of the shielded conformal array in the presence of structural errors; by means of the method, the influence of the shielding object on the array far field can be calculated more quickly and accurately, and reference is provided for array layout design under next shielding. Themethod can be used for calculating the influence of the fixed shielding object on the carrier on the array conformal on the body of the large carrier. The method is suitable for calculating the influence of the fixed shielding object on the carrier aircraft on the conformal array located on the carrier aircraft on the far-field directional diagram.

An acoustical noise reduction system which comprises a primary acoustic to electric transducer, digital signal processor (DSP), an electric to acoustic transducer, and a secondary acoustic to electric transducer is disclosed in the present invention. The active noise reduction system is located close to the noise source with the sound being sensed by a primary transducer before the noise enters the active noise reduction area. The system functions to generate an anti-noise cancellation sound wave with an acoustic propagation speed of approximately 330 m / sec and an electromagnetic propagation speed of approximately 3×10̂8 m / sec.

The invention discloses a corner hidden target imaging method based on multi-imaging dictionary fusion, and solves the problem of corner hidden target imaging positioning in an urban non-line-of-sightenvironment. Corner hidden target imaging detection is carried out by utilizing diffraction and reflection propagation characteristics of electromagnetic wave signals transmitted by an MIMO radar. Firstly, diffraction and primary reflection propagation characteristics in an L-shaped corner scene are analyzed; a diffraction and primary reflection virtual radar array is constructed based on the electromagnetic propagation characteristics, time delay of different propagation paths of the electromagnetic wave is calculated according to the virtual radar array, a corresponding imaging dictionary is established, and original imaging results containing a real target and a false target are obtained corresponding to the different propagation paths by using a back projection imaging algorithm; andfinally, all original imaging results are multiplied and fused to obtain a radar image only containing a real target. The method is simple in implementation process, can obtain a high-quality accurateradar target image, and can effectively solve a corner multi-target imaging positioning problem.

The invention relates to the technology of electromagnetic field intensity prediction, so as to enable a prediction model to be more suitable for a complex electromagnetic propagation environment and solve a problem that a conventional scheme is poor in prediction precision and low in convergence speed. The technical scheme employed in the invention is that a field intensity prediction method based on a modularized neural network comprises the following steps: 1, building a radio propagation scene, selecting a number of receiving sample points from the scene, and obtaining the intensity values of the points through measurement or simulation; 2, carrying out the clustering of all sample points through a K-mean clustering method according to the distribution characteristics of field intensity data of received signals, so as to achieve the decomposition of an input sample space, and build corresponding sub-neural-network modules; 3, carrying out the training of the sub-neural-network modules of the modularized neural network through the above sample points; 4, carrying out the prediction through the trained modularized neural network. The method is mainly used in an electromagnetic field prediction occasion.

The invention relates to a cross fold line type slotted wideband uniplanar compact electromagnetic band gap UC-EBG structure and a design method thereof, and belongs to the electromagnetic transmitting and receiving technology field. The UC-EBG structure has characteristics of wide band and adjustable band gap. The parallel reflection band gap of the CFL-UC-EBG is in a range from 63 to 935 GHz, and the relative bandwidth is 38.85%. Based on the same structure, by changing a structure unit number, when three CFL-UC-EBG structure units are in a periodic arrangement, the UC-EBG structure having the forbidden band gap in a range from 50 to 80 GHz and the relative bandwidth of 46.15% is acquired. The CFL-UC-EBG provided by the invention is widely used for 60GHz high frequency microwave antennas.