51 results about "Wave transmission" patented technology

The application provides a low-frequency antenna, an antenna array and an electronic device. The low-frequency antenna comprises a dielectric substrate and a plurality of radiation units arranged on the dielectric substrate. Each radiation unit comprises a ring-shaped radiation element and a frequency selective surface arranged in the ring-shaped radiation element, and the frequency selective surface and the ring-shaped radiation element are insulated from each other. Each ring-shaped radiation element is provided with a gap. The low-frequency antenna provided by the application has a relatively wide wave transmission characteristic, and can realize relatively independent regulation and control.

The application discloses a kind of wideband sandwich radome based on double-band super surface, it includes sequentially arranged first impedance matching layer, radome frequency selective surface layer, second impedance matching layer, the radome frequency selective surface layer includes several periodic frequency selective surface units, radome frequency selective surface layer is formed by multilayer metal structure and dielectric substrate A space filter, so that corresponding wideband sandwich radome has wave band selectivity;When electromagnetic wave irradiates to the surface of wideband sandwich radome based on double-band super surface, two transmission poles are generated in low frequency band to form second-order band-pass filter response, and three transmission poles are generated in high frequency band to form third-order band-pass filter response.The advantages are: the wideband sandwich radome has the excellent characteristics of double-band wideband wave transmission, large-angle stability, out-of-band steep cutoff, adjustable frequency ratio of wave transmission band center frequency, polarization insensitivity and the like by the above structure, and the overall structure is simple and easy to process.

This disclosure discloses a millimeter-wave antenna device and a millimeter-wave antenna base station, belonging to the field of antenna technology. The millimeter-wave antenna device includes a transmitting module, a receiving module, an radome with wave transmission characteristics, and a base with electromagnetic wave shielding characteristics. The radome is fixedly connected to the base to form a cavity, and the transceiver modules are located inside the cavity and spaced apart on the base. An absorbing material layer is provided on the side of the radome facing the base, and the projection of the absorbing material layer onto the base lies between the transceiver modules. The absorbing material layer comprises the following components in parts by weight: 10-60 parts thermoplastic resin, 40-85 parts absorbing powder, and 2-15 parts toughening agent, wherein the absorbing powder includes carbonyl iron powder, and the particle size D50 of the carbonyl iron powder is 1μm-6μm. The absorbing material layer has strong normal and wide-angle absorption efficacy for millimeter waves in the 24.25GHz-29.5GHz frequency band, effectively reducing millimeter wave reflection interference from the base and improving signal isolation between the transceiver modules.

The application relates to a silicon-based millimeter wave broadband compact double-drive high-efficiency Doherty power amplifier, belonging to the technical field of radio frequency integrated circuits, comprising an input quadrature coupler, a main and auxiliary two power amplifier paths and a broadband load modulation output network; wherein the power amplifier path adopts a differential common source and common gate unit with cross-coupling capacitance and a double-mode drive topology to improve the gain and efficiency of the millimeter wave frequency band; the output network adopts a slow wave transmission line structure combined with a cascade coupling line pair to realize broadband active load modulation and absorb transistor parasitic capacitance, and simultaneously optimize the chip area. Thus, the problem that the efficiency and bandwidth are difficult to be considered simultaneously due to the limited load modulation bandwidth and the decreased transistor gain of the traditional silicon-based millimeter wave Doherty power amplifier is solved.

This invention provides a train formation control system and method that enable network connection between train formations and network separation within train formations without waiting for the physical coupling / uncoupling of electrical couplers, and that perform processing related to the coupling and splitting of train formations. [Solution] In the train formation control system, train formation 1A and train formation 1B are each equipped with a control device and a millimeter-wave transmission device. When train formation 1A and train formation 1B are separate formations, each control device, upon receiving the coupling signal, causes each millimeter-wave transmission device to search for each other to establish a transmission path. Once the transmission path is established, it performs the coupling process between train formation 1A and train formation 1B. When train formation 1A and train formation 1B are a single formation, upon receiving the coupling signal, it performs the separation process between train formation 1A and train formation 1B. Once the separation process is complete, it terminates radio wave transmission to each millimeter-wave transmission device.

This invention discloses a low-frequency electromagnetic energy selective surface structure in the field of electromagnetic protection technology. The structure comprises a double-layer energy selective surface, including a first surface layer and a second surface layer, which are correspondingly arranged. Both the first and second surface layers are composed of a periodic metal structure loaded with PIN diodes. This invention utilizes the impedance change characteristics of PIN diodes under strong and weak fields. Under strong electromagnetic pulses, the diodes automatically conduct to form a low-impedance shielding mesh, achieving protection performance close to that of a metal shield. Under normal communication conditions with weak fields, the diodes are cut off, exhibiting high capacitive reactance. Combined with the structural resonance of the ring-cross unit, efficient wave transmission is achieved in the L / S band.

This invention discloses a method for operating in a circular waveguide TE 11 This invention relates to a millimeter-wave high-power rotating reflective waveguide phase shifter, belonging to the field of millimeter-wave transmission technology. It comprises a rectangular waveguide wide-side slot 3dB coupler, a rectangular-circular waveguide transition section, and a rotating circular waveguide phase shifting section, with its central plane divided into two symmetrical microwave channels. Electromagnetic waves are first injected through the first port of the rectangular waveguide wide-side slot 3dB coupler, then split into two paths entering the rectangular-circular waveguide transition section through the third and fourth ports of the coupler, and subsequently injected into the rotating circular waveguide phase shifting section. After propagating a certain distance within the two phase shifting waveguides, the waves are reflected by a rotating metal plate piston and finally output from the second port of the rectangular waveguide wide-side slot 3dB coupler. This invention modulates the phase at the output end by changing the electrical length of the electromagnetic wave propagating within the phase shifting section by rotating the position of the metal plate piston. Within the same operating frequency band, it possesses advantages such as high power capacity, compact structure, high phase shifting accuracy, and a large phase shifting range.

A system for satellite communications includes a decision logic module, a payload integrated circuit, an optical transceiver, an optical array, a millimeter wave transceiver, and an antenna array. The decision logic module evaluates channel conditions and selects one of four transmission modes based on a signal quality metric. The payload integrated circuit generates outbound baseband data and receives demodulated data. The optical transceiver is coupled to the decision logic module and transmits and receives optical signals over a free space link using a first or second modulation format. The optical array is responsible for optical signal transmission and reception. The millimeter wave transceiver is coupled to the decision logic module and transmits and receives millimeter wave signals over a free space millimeter wave link using a third or fourth modulation format. The antenna array supports millimeter wave transmission and reception. The first modulation format requires a higher signal-to-noise ratio and provides a higher spectral efficiency than the second modulation format, and the third modulation format requires a higher signal-to-noise ratio and provides a higher data rate than the fourth modulation format.

This invention relates to the field of acoustic metamaterials technology, and more particularly to a high-throughput topological beam splitter based on multimode phononic crystals. The device includes: an acoustic wave transmission channel; valley phononic crystals A and B, respectively disposed below and above the acoustic wave transmission channel; valley phononic crystals A and B are composed of scatterers with a two-dimensional cross-section resembling a triangle, and the scatterers of valley phononic crystals A and B have different rotational orientations; valley phononic crystals A and B are mirror-symmetrically distributed about the acoustic wave transmission channel; the acoustic wave transmission channel includes a first segment and a second segment connected sequentially, the second segment being a coupling region, and its terminal branching into three sub-channels, the three sub-channels being located at the middle and both sides of the end of the second segment. The device provided by this invention can achieve high-throughput transmission and precisely control the acoustic wave propagation path by adjusting the operating frequency.

This invention belongs to the field of ultrasonic transducer technology and discloses a transceiver integrated fiber optic all-optical ultrasonic probe and its fabrication method. The probe includes an optical fiber (1), a capillary tube (2), a plano-concave diaphragm (4), and a photoacoustic conversion layer (5). One end of the plano-concave diaphragm is concave, and the other end is planar, forming a closed FP cavity (3) with the optical fiber and capillary tube. The photoacoustic conversion layer can absorb the laser beam energy of the excitation light and convert it into ultrasonic waves, which are then emitted outwards to realize ultrasonic wave transmission. At the same time, the photoacoustic conversion layer can receive ultrasonic wave echoes and deform the plano-concave diaphragm according to the strength of the ultrasonic wave echoes, causing the cavity length of the FP cavity to change, thereby realizing the function of receiving and detecting sound waves. This invention utilizes a capillary tube and forms a plano-concave diaphragm at the end of the capillary tube, which on the one hand facilitates the miniaturization of the probe, and on the other hand significantly improves the reflection contrast of the FP cavity, thereby enhancing the detection performance.

The application discloses a traveling wave antenna unit, an array and a method for improving high-field magnetic resonance radio frequency field uniformity, relates to the field of magnetic resonance imaging, and aims to improve high-field magnetic resonance radio frequency field uniformity. The application increases the component of the wave number of the traveling wave antenna unit in the traveling wave transmission line direction in the traveling wave antenna array through physical or chemical means to relieve the radial standing wave effect. The traveling wave antenna unit comprises a layer-by-layer designed metal microstrip, a first bearing substrate, a filling layer substrate, a slotted metal floor, a second bearing substrate and a spacing layer substrate. A feeding port is connected between the first end of the metal microstrip and the slotted metal floor, and a load is connected between the second end of the metal microstrip and the slotted metal floor. The filling layer substrate is a fillable structure. The component in the traveling wave transmission line direction is increased by increasing the relative dielectric constant of the filling medium or changing the slotted structure. The application is simple in design, convenient in operation and does not need additional hardware.

This invention relates to an InP-based Mach-Zehnder interferometer electro-optic modulator and its fabrication method, belonging to the field of electro-optic modulator fabrication technology. The invention discloses an InP-based Mach-Zehnder interferometer electro-optic modulator, comprising a sequentially connected optical input terminal, an optical modulation region, and an optical output terminal. The traveling wave electrode in the optical modulation region includes a microwave transmission line and several periodically arranged electrodes connected to the transmission line. The electrodes are located on the surface of a P-type contact layer of an active waveguide structure, and the active waveguide structure, from bottom to top, comprises an InP substrate layer and an epitaxial wafer. The epitaxial wafer, from bottom to top, comprises an N-type doped layer, spacer layer I, a quantum well layer, spacer layer II, a lightly doped P-type layer, a P-type doped layer, and a P-type contact layer.

This application relates to the field of medical device testing technology, specifically a phantom and method for coronal plane reflection detection in a three-dimensional imaging device. The phantom includes: a top panel and a sealed space inside the acoustic window filled with a background tissue-like material; target lines embedded in the background tissue-like material; an acoustic window, a window for ultrasonic wave transmission, simulating the acoustic characteristics of human epidermal tissue; the background tissue-like material is a water-based polymer gel-based composite material; target lines, with their upper ends fixed in openings in the top panel and their lower ends free; used for quantitative measurement of imaging parameters in the coronal plane, where the coronal plane is a plane parallel to the horizontal plane when the human body is prone on the three-dimensional ultrasound imaging device; the imaging parameters include the lateral linearity, longitudinal linearity, axial image resolution, and lateral image resolution of the reflected image in the coronal plane; the center-to-center distance between two adjacent target lines is a predetermined distance; the predetermined distance is determined by the resolution of the three-dimensional ultrasound imaging device at the corresponding position in the coronal plane.

This invention discloses an ultra-wideband V-band deployable arm rotary joint and its signal transmission method, relating to the field of microwave communication. The rotary joint includes a first rotating part and a second rotating part coaxially rotated together via bearings, forming a microwave transmission cavity connected along an axis. First and second microwave transmission components are symmetrically arranged within the cavity. Each component includes an input / output rectangular waveguide port, an orthogonal mode coupler, a cross-shaped gate structure, and a phase shifter. The orthogonal mode coupler enables the mutual conversion between linearly polarized and mixed-polarized waves, the cross-shaped gate structure enables power splitting and combining, and the phase shifter generates a 90° phase difference to generate or combine circularly polarized waves. This invention achieves ultra-wideband, low insertion loss, high isolation, and independent dual-polarization dual-channel transmission, suitable for single deployment of satellite deployable arms, and solves the problems of narrow bandwidth, few channels, and poor stability in existing rotary joints.

This invention relates to the field of electromagnetic wave technology and discloses a frequency selective surface structure with a stable angle and high frequency ratio, comprising multiple identical regular hexagonal FSS units arranged in a periodic equilateral triangle pattern. Each FSS unit includes, from top to bottom, a first dielectric substrate, a metal layer, and a second dielectric substrate. The metal layer, from the outside in, consists of a hexagonal ring, three elongated branches of the same size, and three patches of the same size. The three patches are rotationally symmetrical about the center of the hexagonal ring and are connected to the hexagonal ring through the three elongated branches. The patches are rhomboid patches, with the extension of the shorter diagonal of each rhomboid patch passing through the center of the hexagonal ring; alternatively, the patches can be isosceles triangles, ">" shapes, or "<" shapes. Under perpendicular incidence conditions, this invention achieves a frequency ratio of approximately 4, and with rhomboid patches, the frequency ratio is 4.3. Even at large incident angles, the wave transmission performance remains relatively stable. This structure is simple and easy to manufacture.

This application discloses a terminal device, a management node, and a wireless communication method. The wireless communication method includes: the terminal device receiving reference signal configuration information sent by the management node in a first frequency band; the terminal device receiving or transmitting a reference signal in the millimeter-wave frequency band based on the reference signal configuration information, when the millimeter-wave transmission of the terminal device is in a deactivated state, so as to maintain time-frequency synchronization with the transmitting or receiving end of the reference signal in the millimeter-wave frequency band; the first frequency band is lower than the millimeter-wave frequency band.

This invention discloses a dynamic error compensation system and method for millimeter-wave transmission links, relating to the field of millimeter-wave wireless communication transmission technology. It includes a millimeter-wave signal transceiver module operating between 24 GHz and 100 GHz, a multi-dimensional error sensing module employing a synchronous parallel sampling architecture to synchronously detect phase, amplitude, group delay, and frequency offset coupling errors, a digital predistortion compensation module implemented on an FPGA, and an adaptive parameter adjustment module that dynamically adjusts compensation parameters using a dual-driven mechanism of error and environment. Combined with multi-modal environment sensing, it achieves active pre-compensation. Time-division multiplexing within the data frame protection interval enables uninterrupted online calibration, and a fault self-diagnosis and redundancy backup module is integrated to achieve graded fault handling. This invention improves compensation accuracy and response speed through deep multi-module collaboration, enables uninterrupted online calibration, possesses fault self-diagnosis capabilities, and can maintain stable millimeter-wave communication transmission quality over a long period.

The application discloses a taekwondo hitting judgment method and system coupling force-angle-penetration force, relates to the technical field of taekwondo competition detection, and comprises the following steps: collecting the peak value of hitting force, hitting angle, outer layer displacement of a protector, inner layer displacement of the protector and impact wave transmission speed synchronously in the core hitting area of the protector through an integrated detection module; calculating the displacement difference value based on the outer layer displacement of the protector and the inner layer displacement of the protector, determining the hitting penetration force in combination with the impact wave transmission speed and a pre-labeled calibration coefficient, and performing filtering, analog-digital conversion and normalization processing on the peak value of hitting force, hitting angle and hitting penetration force to obtain standardized parameters; under the condition that the hitting angle is in the effective range of 0 degrees to 30 degrees, performing weighted fusion based on the standardized parameters to generate a hitting effective coefficient; and judging the hitting result as invalid hitting, light hitting, heavy hitting or critical hitting according to the numerical interval of the hitting effective coefficient.

a kind of nC 60+ Fullerene meteorite-based radar and communication antenna technology solution, nC 60+ This approach utilizes focused ion beam electromagnetic field technology, which leverages shared ionic bonds and large π-bonded covalent bonds; micro / nano electronic grid resonant cavities formed by laser direct writing and sintering of large π-bonded electron clouds; and selective terahertz wave propagation technology using metal, semiconductor, and CMOS chips directly written onto micro / nano electronic grid resonant arrays and phased arrays. This scheme enables antennas to become superconducting tools for transmitting and receiving optical and electromagnetic waves. Applications include long-distance terahertz weak signal communication, radar, "black holes" and "light boxes" for optical and electromagnetic waves (such as terahertz wave absorption or submersion – used for stealth), imaging detection, sensitive wave identification, and selective sensing. 60+ Fullerene meteorite-like materials, including laboratory-produced nC60. + and having nC 60+ Mineral or synthetic polymer substitutes with a particular strength or complementarity.

This invention discloses a low-loss microwave transmission line structure and microwave circuit based on 3D printing. The invention includes a single-dielectric transmission layer and first and second shielding shells. The shielding shells are integrally formed by 3D printing, and both their inner and outer surfaces are metallized to form an electromagnetic shielding layer. The single-dielectric transmission layer is fixed as an independent physical layer between the first and second shielding shells. The inner surface of the first or second shielding shell has a de-resonance support structure along the routing direction of the radio frequency signal transmission line. This structure includes a recessed structure and a solid portion forming the recessed structure. The solid portion serves as a protrusion for positioning and support during assembly. When the three components are assembled, the protrusion passes through the single-dielectric transmission layer, and the recessed structure forms continuous air cavities on the upper and lower sides of the radio frequency signal transmission line, enabling the radio frequency signal transmission line to be in a self-encapsulated state. This invention provides a potentially applicable basic architecture for constructing complex microwave and millimeter-wave subsystems.

The application provides a wave process calculation method considering the corrugated aluminum sheath structure of a high-voltage cable, and the steps include: deducing the inner radius formula of the corrugated aluminum sheath of the high-voltage cable according to the geometric characteristics of the corrugated aluminum sheath; using the average geometric radius technology to equivalently convert the corrugated aluminum sheath into a uniform cylindrical shell; using a sine function to fit the corrugation of the actual corrugated aluminum sheath; solving the effective length of the equivalent uniform cylindrical shell; deducing the conductor impedance calculation approximate formula based on the effective length and the equivalent uniform cylindrical shell structure; deducing the admittance calculation formula based on the actual corrugated aluminum sheath structure of the high-voltage cable; calculating the cable wave transmission process characteristic parameters considering the corrugated aluminum sheath structure based on the above formula; and verifying the calculation results by building a low-voltage pulse verification test loop. The application is not only suitable for the distributed parameter equivalent circuit calculation of the corrugated aluminum sheath power cable of different sizes, voltage grades and lengths, but also can improve the electromagnetic transient simulation accuracy of the cable.

The invention relates to the field of strain wave gearing, which is also commonly referred to as "harmonic drive". In order to provide a frictional strain wave gearing which enables the deformation of the flexspline in a simple, mechanical manner, including the generation of the necessary contact forces, so that technically usable forces can be transmitted without significant effort to compensate for mechanical tolerances present in the gearing, a frictional strain wave gearing is proposed, having an outer cylinder, a flexspline and a wave generator, wherein the outer cylinder, the flexspline and the wave generator are in force transmission by frictional contact, which is generated by a pressing force, wherein at least one structure having an elastic shape is formed by a component of the wave generator or the outer cylinder, the elastic shape being hollow in the region of the frictional contact and having a constant wall thickness even when the shape is deformed, wherein the elastic structure is configured to exert the pressing force. The invention also relates to a frictional planetary gearing.

The application is specifically an optimization method of an air unmanned aerial vehicle communication network based on AI, relates to the technical field of communication networks, and comprises intelligent sensing and data processing, an AI decision and optimization core, communication and task collaborative management, and resource and energy consumption optimization.In the application, a laser radar scans a canyon terrain in real time, a cutoff frequency is calculated in combination with a rectangular waveguide model, a transverse electric wave transmission mode is dynamically adjusted, terrain changes are predicted in advance and mode switching is triggered, a buffer interval and a rollback mechanism are matched, and signal interruption caused by a terrain-induced multipath trap can be avoided; when a canyon width suddenly changes, mode switching is started in advance, parameter updating is completed before the unmanned aerial vehicle reaches a critical area, the risk of communication interruption is reduced, the rollback mechanism can correct erroneous switching, and link continuity is ensured.

The application relates to the technical field of unmanned aerial vehicle (UAV) millimeter wave communication, and particularly discloses a low-delay millimeter wave transmission method for UAV group communication measurement and control, which comprises the following steps: constructing a parallel conventional service data transmission channel and a physical layer bypass transmission channel, wherein the conventional service data transmission channel comprises a channel coding and interleaving module, and the physical layer bypass transmission channel bypasses the channel coding and interleaving module. According to the application, a bypass transmission channel independent of conventional data is constructed at the physical layer, so that emergency measurement and control instructions directly bypass time-consuming channel coding and interleaving modules, the waiting time of data processing is greatly reduced at the bottom hardware level, the instructions are directly output to the flight control system of the UAV after being parsed, and the instantaneous dynamic response requirement of the UAV when facing a sudden obstacle or emergency tactical action is met.

An obstacle detection device according to the present disclosure includes: a transmission circuit, which, in operation, transmits a transmitted wave signal subjected to frequency modulation; a reception circuit, which, in operation, receives a signal externally; an object detection circuit, which, in operation, detects an object existing in a wave transmission direction of the transmitted wave signal, based on a reflected wave of the transmitted wave signal received by the reception circuit; an interference detection circuit, which, in operation, detects, as interference, another transmitted wave signal transmitted from another transmission circuit different from the transmission circuit, based on the signal received by the reception circuit; and a determination circuit, which, in operation, determines a frequency modulation pattern to be applied to the transmitted wave signal and a transmission timing of the transmitted wave signal, based on detection results of the object detection circuit and the interference detection circuit.

This disclosure describes an apparatus (10) for improving the transmission behavior of radar waves (λ), the apparatus (10) comprising: a mounting portion (14) to which a radar sensor (12) can be fastened; and a wall portion (18) having a first surface (20) and a second surface (22), wherein a radar wave (λ) emitted by the radar sensor (12) when fastened to the mounting portion (14) impacts the first surface (20) at an incident angle (α, β, γ, δ), enters the wall portion (18), and exits the wall portion (18) via the second surface (22), the radar wave (λ) traveling a certain distance (d) between the first surface (20) and the second surface (22), the first surface (20) and the second surface (22) being shaped such that the travel distance (d) of the radar wave (λ) remains constant for each incident angle (α, β, γ, δ).

This invention discloses a frequency division multiplexer based on the propagation characteristics of magnetostatic waves in a magnetic double-layer thin film, relating to the field of microwave magnetic signal processing technology. Two magnetic thin films, FM1 and FM2, made of different materials, are stacked vertically. These two materials have different thicknesses, different saturation magnetizations, and different damping coefficients. Using one input metal line and two output metal lines as microstrip transmission lines, the input signal enters the middle metal line as a microwave current. Magnetostatic waves of different frequencies propagate along the left and right sides respectively. These different frequency magnetostatic waves are converted into microwave signals of corresponding frequencies on the left and right metal lines, thus achieving frequency division. This invention can achieve the propagation of magnetostatic wave signals at different frequencies along different directions without additional modulation or asymmetric structures, thereby completing frequency division multiplexing.

An ultrasonic sonar device 1 comprises: a first mark drawing means 15a for drawing a first mark 31 at a prescribed position of a first detection result image 22 on the basis of an operation from a user; and a second mark drawing means 16a for, on the basis of the depth in water at the prescribed position where the first mark 31 is drawn on the first detection result image 22 by the first mark drawing means 15a or the distance from a wave transmission / reception unit 50, drawing a second mark 32 at a position, in a second detection result image 23 and / or a third detection result image 24, corresponding to the depth or the distance.

The present disclosure provides a master sensor, a slave sensor, and a radar sensor system configured to control radar wave transmission. The master sensor includes a controller configured to generate a control signal for a start of radio wave transmission based on a radio wave transmission timing of a radar sensor of each sensor, and to process a reflection wave corresponding to the transmitted radio wave, and a transceiver configured to transmit the generated control signal to other sensors. The controller is configured to transmit the control signal to at least one sensor of a first group and at least one sensor of a second group at different timings. The present disclosure can prevent malfunction by avoiding interference between radar waves, i.e., reducing false alarms caused by false detection due to inter-wave interference.