449 results about "Wave structure" patented technology

The invention discloses a method and a system for constructing a characteristic of influence of a solitary wave on underwater sound propagation loss in an ocean. The method comprises the following steps: acquiring acoustic environment parameters of a specified simulated ocean area to construct an ocean acoustic environment; constructing a plurality of internal solitary wave structures according to the internal solitary wave characteristic parameters; combining the marine acoustic environment and the internal solitary wave structure to construct a plurality of internal solitary environment models; setting a sound source and a receiver, and calculating a sound field by adopting a kraken model based on the internal isolated environment models and the set sound source and receiver to obtain sound propagation loss of each internal isolated environment model; and comparing and analyzing the sound propagation loss of various internal isolated environment models to obtain the influence of the internal isolated waves on the sound propagation loss characteristics. The invention aims to improve the accuracy of the characteristic data of the underwater sound propagation loss influenced by the marine internal solitary wave based on the influence of the internal solitary wave characteristic parameters on the sound propagation loss.

The invention relates to the technical field of blowers, in particular to a low-noise blower and a low-noise drying machine. The low-noise blower comprises a shell provided with a first air inlet; the inner shell is arranged in the outer shell, the outer shell is in closed connection with the rear end of the inner shell, an air outlet is formed in the rear end of the inner shell, and a flow collecting air inlet is formed in the front end of the inner shell; an air outlet channel is formed between the flow collecting air inlet and the air outlet through the inner wall of the inner shell, and a driving component is arranged in the air outlet channel. A first air inlet channel is formed between the first air inlet and the flow collecting air inlet through an interlayer space between the inner wall of the outer shell and the outer wall of the inner shell, and the first air inlet channel surrounds the driving component. The front end face of the flow collecting air inlet is of a wave-shaped structure. The first air inlet channel wraps the driving component through the double-layer shell structure, noise of turbulent flow gas in the driving component is isolated through laminar flow gas, the end face of the flow collecting air inlet is arranged to be of a wave structure, airflow entering the driving component is combed, and turbulent flow noise generated by airflow steering is reduced.

The invention discloses a seismic surface wave suppression method based on EWT-Curvelet, and belongs to the technical field of seismic exploration data processing. The method comprises the following steps: firstly, performing empirical wavelet transform (EWT) on post-stack seismic data channel by channel, extracting a frequency localized modal component through adaptive spectrum segmentation, and constructing a surface wave noise model; then converting the model to a curvelet domain, performing physical constraint filtering at a specific scale and in a nearly horizontal direction, and combining pixel connectivity analysis to suppress a continuous noise region; and finally, reconstructing and optimizing noise through inverse transformation and removing the noise from the original data. The method has the advantages that the modal aliasing problem is solved through channel-by-channel adaptive spectrum segmentation, a surface wave energy dense region is accurately locked by curvelet domain scale-direction combined filtering, isolated effective signals are protected in combination with connectivity analysis, high-precision suppression of surface waves is efficiently achieved in a non-iterative mode, meanwhile, the structural integrity of reflected waves is kept, and high-precision suppression of the surface waves is achieved. The seismic section signal-to-noise ratio and the geological interpretation precision are remarkably improved, and the method is suitable for land seismic exploration data processing.

The invention belongs to the field of wireless communication, and particularly relates to a Butler matrix feed network with a slow wave structure, which comprises a substrate integrated waveguide and a Butler matrix feed network formed on the substrate integrated waveguide, the Butler matrix feed network comprises a first 3dB coupler, a second 3dB coupler, a third 3dB coupler, a fourth 3dB coupler, a first cross coupler, a second cross coupler, a first 45-degree slow wave loading phase shifter, a second 45-degree slow wave loading phase shifter, a first 0-degree slow wave loading phase shifter and a second 0-degree slow wave loading phase shifter. According to the Butler matrix feed network, a row of non-radiation transverse slots are introduced into each phase shifter to serve as phase delay lines, so that the structure size of the Butler matrix feed network is reduced, and the dispersion is reduced.

A phased antenna array in a package is provided. The phased array antenna in a package comprises an antenna array with an integrated passive beamformer network, and at least one actuation mechanism. The passive beamformer network comprises at least one phase shifter, and each of the at least one phase shifter comprises a transmission line having a slow-wave structure and a ceramic. Each of the at least one actuation mechanism comprises a magnet and an electromagnet coil, where the magnet is coupled to the ceramic. The at least one actuation mechanism configured to increase or decrease a gap between the transmission line and the ceramic.

The invention provides an anti-wave structure and an anti-wave method suitable for offshore new energy engineering, and belongs to the technical field of offshore new energy engineering, the anti-wave structure comprises a mounting cylinder fixed on the bottom end face of an offshore equipment platform, and an energy consumption assembly is arranged on the mounting cylinder; the energy consumption assembly comprises an outer side fixing ring and a friction metal ring, the outer side fixing ring is fixed to the outer wall of the mounting cylinder, the friction metal ring is arranged on the mounting cylinder in a sleeving mode and located below the outer side fixing ring, and the top of the friction metal ring is rotationally connected with the outer side fixing ring through a fixing ring sleeve; an annular friction strip is arranged at the position, close to the bottom of the friction metal ring, of the friction metal ring, and the surface of the annular friction strip is attached to the rough face in the friction metal ring. A wave receiving disc is arranged at the bottom end of the friction metal ring. According to the structure, through the deformation-friction synergistic effect, the wave impact effect of the offshore equipment platform under the complex sea condition is effectively weakened, and the wave resistance of the offshore equipment platform is improved.

The invention discloses a three-dimensional wave liquid level visual intelligent reconstruction evaluation system, and belongs to the field of ocean engineering monitoring. The system comprises an image acquisition module, an image stereoscopic vision processing module, an attention-enhanced reconstruction neural network module, a camera attitude evaluation module, a visualization and output module and a hydrodynamic parameter analysis module. An image is collected through a fixed baseline binocular camera system, after preprocessing, a neural network fused with a multi-scale attention mechanism is utilized to reconstruct a three-dimensional wave structure, coordinate system conversion is achieved in combination with self-supervised attitude evaluation, and finally hydrodynamic parameters such as significant wave height and a three-dimensional velocity field are extracted and visualized. The system does not need explicit calibration and large-scale data, has high automation, real-time performance and strong environmental adaptability, can be deployed on various platforms, and significantly improves the precision and engineering applicability of non-contact wave observation.

The invention belongs to the technical field of ocean engineering, and particularly relates to a potential flow-viscous flow real-time coupling hydrodynamic analysis method and system for a floating body with a heaving plate. The method comprises the following steps of: 1, establishing a free surface potential flow model based on a three-dimensional potential flow theory, simulating wave-structure interaction, ignoring a viscous effect, converting a frequency domain result of a hydrodynamic load into a time domain load through a frequency-to-hour method, and taking the time domain load as an input for solving a motion state; 2, establishing an unbounded viscous flow CFD model, viscous force not covered by a potential flow model and an updated unbounded turbulent flow field around the heaving plate, and calculating the viscous force of the heaving plate; 3, establishing an unbounded potential flow model, and separating a force component repeated with the potential flow from a viscous flow result; 4, integrating the potential flow force and the viscous force to solve a floating body motion equation, iteratively updating the motion state and feeding back the motion state to the two solvers. The method is used for solving the problems that the efficiency is correspondingly reduced if the precision is improved and the precision cannot meet the requirement if the efficiency is improved in the prior art.

The invention belongs to the technical field of antennas, and discloses a dual circularly polarized leaky-wave antenna based on a substrate integrated waveguide, which comprises a feed structure and a radiation structure, the feed structures are symmetrically arranged at the two ends of the radiation structure, and the feed structures and the radiation structure are substrate integrated waveguides; the feed structure is used for converting received external electromagnetic energy into guided electromagnetic waves and has the characteristic of widening impedance; wherein a gradient coplanar waveguide transmission line is designed in the feed structure; the radiation structure is used for converting the guided electromagnetic waves transmitted by the feed structure into circularly polarized electromagnetic waves in a free space; wherein a grid window leaky wave structure is designed in the radiation structure; by combining the leaky-wave antenna and the substrate integrated waveguide technology, the gradient coplanar waveguide transmission line is designed on the feed structure, and the grid window leaky-wave structure is designed on the radiation structure, so that the millimeter wave working frequency band requirement is met, and the antenna has the characteristics of wide axial ratio bandwidth, low side lobe, large scanning range, low profile and low cost.

The invention discloses a multi-beam VICTS antenna and a communication terminal, and the multi-beam VICTS antenna is of a multi-layer structure, and comprises a continuous cross section node slot radiation layer, a slow wave structure wave guide layer and a microstrip Rotmann lens feed network layer which are sequentially arranged from top to bottom. An air gap between the continuous section nodal gap radiation layer and the slow wave structure wave guide layer forms a quasi-plane parallel plate waveguide. An electromagnetic wave signal emitted by a satellite antenna enters a quasi-planar waveguide formed by the continuous cross section and the slow wave structure wave guide layer through a gap in the continuous cross section joint gap radiation layer, and electromagnetic waves are transmitted in the quasi-planar waveguide and are sent to the microstrip Rotmann lens feed network through the connection waveguide. And the beam is output from the beam port of the microstrip Rotmann lens. The multi-beam VICTS antenna provided by the invention can utilize multi-beam scanning in the same time period, has larger space coverage capability, and is beneficial to quick satellite finding when a communication-in-moving system is started and quick satellite recapturing after a satellite signal is lost.

A wheel disc for vehicle wheels manufactured by flow forming, in particular for passenger cars, which has a stretched disc transition surface subsequently provided with ventilation holes and a radial outer disc edge. All ventilation holes are located in the transition surface and are attached by punching or cutting. In order to improve the competitiveness of vehicle wheels made of steel or other materials suitable in particular for cold forming compared to cast vehicle wheels made of aluminium, the transition surface is provided with several changes in material thickness generated during flow forming by displacement of the tool and, viewed in the radial direction, effecting a wave structure on the surface facing the tool during flow forming. The surface provided with the wave structure can in particular form the non-visible inner side of a vehicle wheel, but can also form the visible side. In addition, the opposite surface can also be provided with a wave structure.

The invention discloses a reinforced photoelectric composite cable of a coal mining machine, which belongs to the technical field of cables, and comprises a composite cable core structure, an armored protective layer and a sheath system, and the armored protective layer comprises a first steel belt, a second steel belt and a metal net braid layer, a third steel belt which is continuously bent to be of a wave structure is arranged in a cavity formed by the first steel belt and the second steel belt, the wave troughs of the third steel belt make contact with the inner wall of the first steel belt, and the wave crests of the third steel belt make contact with the inner wall of the second steel belt. The cable can be subjected to multi-dimensional mechanical property collaborative optimization under complex working conditions, the purpose of graded unloading is achieved through deformation of the steel plate, the situation that a traditional structure generally depends on rigid resistance of an armor layer is not needed, the flexibility is considered while the mechanical property is guaranteed, and the cable adapts to frequent bending scenes; and the long-term stable operation of the cable in a severe mine environment is further ensured.

The invention belongs to the field of millimeter wave point-to-point communication, and particularly relates to a broadband fixed-beam leaky-wave antenna with a filtering characteristic. The substrate integrated coaxial line transmission structure is adopted to feed the two ends of the leaky-wave structure, and the substrate integrated coaxial line transmits quasi-TEM waves and has a very weak dispersion characteristic, and the phase constant beta of the quasi-TEM waves changes slightly in a wide frequency band range, so that a fixed radiation wave beam can be obtained in a certain frequency band range; inversion signals are fed at the two ends of the leaky-wave structure so that the two wave beams can form a main wave beam, when the two wave beams deviate from the broadside to radiate by a certain angle, a wave beam with good radiation can still be formed, and therefore the bandwidth corresponding to the fixed radiation wave beam is further widened. On the basis, a plurality of radiation matching units are sequentially arranged on the metal strip in the length direction of the metal strip, so that the fixed-beam leaky-wave antenna has the characteristics that the angle of a radiation beam is kept unchanged in a relatively wide bandwidth, the gain is high, the efficiency is high and the side lobe is low.

The invention provides a method, device and equipment for exciting a single-mode guided wave in grounding flat steel, and belongs to the technical field of engineering structure detection, and the method comprises the steps: building a two-dimensional section model of the detected grounding flat steel through finite element analysis software, defining boundary conditions for the width and thickness in the two-dimensional section model, and carrying out the mode analysis and solving of the grounding flat steel. Performing statistics to obtain frequency-wave number data; based on frequency-wave number data, a phase velocity frequency dispersion curve and a group velocity frequency dispersion curve are drawn, after a corresponding mode is selected, excitation of specific single-mode guided waves is achieved in combination with a wave structure diagram and the application size and direction of a modulation load, and due to the fact that a two-dimensional section model including a width condition is obtained through finite element analysis, the excitation accuracy of the guided waves is improved. The phase velocity frequency dispersion curve and the group velocity frequency dispersion curve are recalculated, the corresponding wave structure diagram is combined, and the appropriate modal guided wave under the specific frequency is reselected for single excitation, so that the appropriate modal can be more accurately selected, and the defect detection accuracy is improved.

The invention discloses a high-power super-radiation light-emitting diode based on three-section integration and a preparation method, belongs to the technical field of structures and processing of optoelectronic devices, and solves the technical problem of directional amplification of optical power output by a super-radiation light-emitting diode based on a three-section integration structure. The diode is of a three-section integrated structure, and the three-section integrated structure is of a cascade structure formed by sequentially connecting a DBR grating area, a J-shaped ridge waveguide super-radiation light-emitting diode area and a semiconductor optical amplifier area. The three-section integrated structure is provided with multiple layers of structures from bottom to top, and the multiple layers of structures are a lower electrode, a lower substrate, a lower limiting layer, an MQW multi-quantum well active layer, an upper limiting layer, an upper substrate and an upper electrode in sequence. And the DBR grating region comprises a waveguide layer and a transverse tapered waveguide structure of a cladding. The J-shaped ridge waveguide super-radiation light-emitting diode area is composed of a bent waveguide part and a straight waveguide part. The semiconductor optical amplifier area is of a conical traveling wave structure. The optical power amplifier is suitable for the fields of optical coherence tomography and optical fiber gyroscopes, and optical power amplification is achieved.

The embodiment of the invention discloses a traveling wave tube high-frequency assembly and an assembling method thereof, the traveling wave tube high-frequency assembly comprises a traveling wave tube high-frequency assembly, the high-frequency assembly comprises a composite tube shell and an all-metal slow wave structure arranged in the composite tube shell, the composite tube shell comprises an electron gun welding disc, a pole shoe, a spacer ring and a collector welding disc, and the electron gun welding disc, the pole shoe and the spacer ring are brazed together. The all-metal slow-wave structure is composed of a plurality of radial sub-cavities, and the radial sub-cavities are fixed in the composite tube shell through high-temperature diffusion welding. The high-frequency assembly does not need to use a thin-wall tube shell, is simple to assemble, can reduce the inner diameter of a magnetic system, increases bunching current, and further increases the output power under the condition that the voltage is not changed. The composite tube shell and the all-metal slow wave structure are matched through a circle, and the machining precision error can be 0.08 mm. The multiple radial sub-cavities can be fixed in the composite tube shell only through high-temperature diffusion welding, the technological process is simple, the assembly efficiency and precision are high, and the problem that the matching degree becomes poor due to the fact that welding flux flows into the slow-wave structure is solved.

The invention discloses a planar slow wave structure of an integrated graphene metamaterial wave absorber, and belongs to the field of microwave devices. A novel planar slow wave structure loaded with a graphene metamaterial wave absorber is designed by utilizing the perfect wave absorbing characteristic and good heat conductivity coefficient of a graphene metamaterial, electromagnetic waves are propagated in a microstrip line of the structure, and a wave absorber which is parallel to the transmission direction of the electromagnetic waves and has frequency selectivity is arranged below the structure. The designed planar slow wave structure of the integrated graphene metamaterial wave absorber conforms to the miniaturization and integration development trend of traveling wave tubes, and has wide application prospects.

The utility model discloses a wave-shaped PTFE (Polytetrafluoroethylene) membrane structure for a building facade. The wave-shaped PTFE membrane structure comprises wave-shaped PTFE membrane structure units, the number of the wave-shaped PTFE film structure units is multiple, and the multiple wave-shaped PTFE film structure units are installed on the outer vertical face of a building in a multi-layer structure. The wave-shaped PTFE membrane structure units are of arc-shaped structures, and the wave-shaped PTFE membrane structure units on the same layer are sequentially connected to form a wave structure; and the wavy PTFE membrane structure units and the wavy PTFE membrane structure units on the adjacent layers are arranged in a staggered manner. The PTFE membrane structure is designed into a multi-layer structure, each layer of PTFE membrane structure is designed into a wave-shaped structure, the adjacent layers of wave-shaped PTFE membrane structures are arranged in a staggered mode, the visual effect of abutted seams is weakened in a wave-shaped modeling mode at the abutted seam positions of the PTFE membrane structures, modeling embodiment is highlighted, and aesthetic requirements are better met.

The invention discloses an anode with a three-dimensional structure and a manufacturing method and application thereof, and belongs to the technical field of electroplating. The anode with the three-dimensional structure comprises an anode rod, an anode active part and a connecting rod, wherein the anode active part has a wave structure, and an included angle between the extension direction of the wave and the anode rod is less than or equal to 10 degrees; the wave structure comprises a straight part and a wave part which are connected; the wave part is in the shape of at least one of a quadrangle, a triangle, an arc and an irregular waveform; the connecting rod connects the anode rod and the anode active component. The anode provided by the invention can provide complex current density distribution, has the advantages of current density compensation for thick plate electroplating, especially BGA dense holes, and can well improve the TP value of the dense holes, so that the electroplating uniformity is improved, specifically, the copper thickness range on the surface of a PCB is reduced, and the electroplating efficiency is improved. The invention also provides a preparation method and application of the anode.

The invention discloses an elastic Bragg breakwater structure response prediction method, and belongs to the technical field of ocean engineering structure dynamic response prediction, and the method comprises the steps: obtaining the front and rear wave surface elevation and motion response data of a breakwater; a double-flow attention mechanism based on physical prior guidance is constructed, and wave-structure interaction is decoupled into two parallel attention flows of structural dynamic evolution and wave-structure coupling feedback; a self-attention mechanism is combined with a time decay physical prior coding structure motion feature, and a bidirectional cross attention mechanism based on a resonance characteristic is combined with a wave-structure phase relation physical prior coding coupling feature; the double-flow features are adaptively integrated through a global context fusion module, and a multi-step prediction sequence is output through linear layer decoding; and a time-frequency domain joint loss function optimization model is adopted, so that the prediction precision is improved. According to the method, physical prior is explicitly embedded into an attention mechanism and is improved by more than 16% compared with an optimal baseline model, and the generalization ability is enhanced by more than 13% under the working condition that waves do not appear.

The utility model discloses a slow wave structure and an expansion interaction oscillator, relates to the vacuum electronic device technology field, and comprises a housing, the housing is internally provided with a coupling cavity, a first grid structure, a second grid structure and a third grid structure, the first grid structure is provided with a first electron beam channel, and the second grid structure is provided with a second electron beam channel. The first grid-shaped structure is provided with a first electron beam channel, the second grid-shaped structure is provided with a second electron beam channel, the third grid-shaped structure is provided with a third electron beam channel, the first electron beam channel, the second electron beam channel and the third electron beam channel are all communicated with the coupling cavity, and electron beams generate beam-wave interaction in the three electron beam channels connected in parallel. Generated electromagnetic waves are coupled in the coupling cavity, and the size and the output power of the trapezoidal line slow wave structure are optimized and improved.

The invention relates to a microwave source device in the technical field of high-power microwaves, in particular to an L-band compact relativistic Cerenkov microwave generating device, and belongs to the technical field of high-power microwaves. Comprising a cathode structure, an external electromagnetic structure and an internal electromagnetic structure, and the cathode structure comprises a cathode seat and a cathode; the external electromagnetic structure comprises an anode outer cylinder, an outer cut-off neck, outer conductor ripples, a collector, a collector baffle and a solenoid coil; the internal electromagnetic structure comprises an inner cut-off neck, an inner conductor ripple, a short circuit block and a microwave output port; the whole structure is rotationally symmetrical about a central axis; through reasonable design of an electromagnetic structure, a coaxial non-uniform double-ripple slow-wave structure is adopted to enhance beam-wave coupling, a high-efficiency beam-wave effect is realized in a relatively short period, and a coaxial collector structure is adopted to improve the resonance characteristic of the slow-wave structure to reduce the axial size, so that miniaturization and compactness of the device are realized.

The utility model relates to the technical field of vacuum electronics, in particular to a trapezoidal staggered gate slow-wave structure of a circular electron beam channel, which comprises a metal shell, trapezoidal upper metal gates and trapezoidal lower metal gates which are symmetrically arranged in a staggered manner are arranged in the metal shell, and the upper metal gates and the lower metal gates are respectively provided with arc-shaped concave holes; along the electron transmission direction, the concave holes respectively penetrate through the upper metal gate and the lower metal gate, and the upper and lower concave holes are enclosed to form a circular electron beam channel. Through the slow-wave structure, the bandwidth of the slow-wave structure can be increased, so that the longitudinal electric field in the slow-wave structure is enhanced.

The utility model discloses a kind of based on three-layer separation's multiphase separator, including tank, its one side is equipped with air inlet, the top of the tank is equipped with exhaust port, and the bottom of the tank is equipped with drain and oil outlet respectively;Inlet baffle, the inlet baffle is set in the tank and is close to the one end of the air inlet;Rectifier, it is installed in the tank top;Overflow partition, it is vertically installed in the tank, and with the tank top clearance is kept, forms a overflow port;Anti-wave structure, it includes multiple anti-wave board, driving part and flow control part, multiple the anti-wave board equidistant installation in the tank, and the driving part is set in the tank outside, and its output end extends to the tank inside.The utility model plays the beneficial effect of: solve the technical problem that the hole diameter of hole on anti-wave board in three-phase separator in prior art cannot be adaptively adjusted, resulting in finally affecting the technical problem of equipment oil outlet effect.

The invention provides a permeable breakwater and a design method thereof, and relates to the technical field of permeable breakwater. Aiming at the lack of a design method for high-precision environment coupling and high-accuracy structure stress prediction during design of a permeable breakwater in the prior art, the method comprises the following steps: establishing a wave-structure-foundation coupling model based on structure stress data, environment soil characteristics and a transmission coefficient of waves; s5, selecting a wave-structure-foundation coupling model, simulating different structure parameter combinations based on the wave-structure-foundation coupling model, and when the simulation results do not meet the target requirements, circularly executing the steps S2 to S5 until the simulation results meeting the target requirements are screened out, and determining a corresponding final structure parameter combination. The cooperative working mechanism of the reduction foundation and the pile foundation is realized, the dynamic interaction of the wave load and the structural response is simulated, and the environmental coupling precision and the structural stress prediction accuracy are improved.

A filter material for manufacturing a segment of a smoking article is described. The filter material includes a hydro-entangled nonwoven, which includes fibers. The fibers are selected from the group consisting of pulp fibers, fibers of regenerated cellulose and mixtures thereof. These fibers are contained in the nonwoven in an amount of 50% to 100% of the mass of the hydro-entangled nonwoven. The nonwoven is in the form of a web, has a longitudinal direction in the running direction of the web, a cross direction orthogonal thereto and lying in the plane of the web and a thickness direction orthogonal to longitudinal direction and the cross direction. The nonwoven is shaped to have a wave structure in the plane formed by the cross direction and the thickness direction with a wave height from 50 μm to 1000 μm and a wave length from 150 μm to 5000 μm.

The utility model discloses an anti-slip dilatation balloon, which relates to the technical field of medical balloons, and comprises a sheath tube, a balloon and a soft head, the balloon is fixed between the sheath tube and the soft head, the two ends of the balloon are respectively and fixedly connected with the sheath tube and the soft head, fiber lines are arranged on the surface of the balloon, the fiber lines are divided into transverse limit lines and longitudinal limit lines, and the transverse limit lines and the longitudinal limit lines are connected with the soft head. The balloon is provided with the fragrance line which enables the balloon to deform, so that the balloon has good anti-falling and anti-skidding effects when the balloon is used for expanding a channel, the balloon is prevented from sliding off and moving, the expansion effect is prevented from being affected, gas on the two sides of the balloon can circulate, and the balloon is prevented from falling off and sliding off when the balloon is used for expanding the channel. The air pressure difference between the two sides of the expansion channel is eliminated, pain of a patient is reduced, the balloon can serve as a mark of the insertion depth and slippage, and medical staff can judge conveniently.

The invention discloses a slow wave structure loaded with a wave-absorbing metamaterial and a traveling wave tube. The technical field of microwave electronics; comprising a closed metal cavity structure for transmitting electromagnetic waves and a wave-absorbing metamaterial structure loaded on the wall surface of the closed metal cavity structure, the working frequency band of the wave-absorbing metamaterial structure is the non-working mode frequency band of the slow wave structure; according to the scheme, structural improvement is carried out on the basis of a traditional slow wave structure, and non-working mode signals are filtered out by loading the wave-absorbing metamaterial of the non-working mode frequency band in the slow wave structure; the loading of the wave-absorbing metamaterial has no influence on the working mode of the slow wave structure, but absorbs the non-working mode to achieve the filtering effect, thereby achieving the effect of inhibiting mode competition.

This invention discloses a microwave-millimeter-wave structured multiplexed antenna for vehicle communication, comprising a microwave half-mode Vivaldi antenna, a millimeter-wave vertically polarized oblique-fire phased array, and a millimeter-wave horizontally polarized oblique-fire phased array. The structured multiplexed antenna constructed by this invention embeds the vertically polarized and horizontally polarized millimeter-wave oblique-fire phased arrays into the inherent structure of the ultra-wideband microwave half-mode Vivaldi antenna, forming a seamlessly integrated high-frequency-ratio multi-band antenna. The vertically polarized and horizontally polarized millimeter-wave oblique-fire phased arrays have the characteristics of wide bandwidth, simple structure, and low profile, while the microwave Vivaldi antenna has the characteristics of ultra-wideband bandwidth and miniaturization. The vertically polarized millimeter-wave antenna and the horizontally polarized millimeter-wave antenna respectively utilize multi-mode resonance superposition and equiphase surface adjustment techniques to achieve a stable 45° oblique-fire beam across a wide operating frequency band without adding additional structures.

A slow-wave structure, a traveling wave tube, an electronic device, and a communication system are provided. The slow-wave structure includes a folded waveguide structure, where the waveguide structure has a cycle in a longitudinal direction and an amplitude in a transverse direction perpendicular to the longitudinal direction, and at least one of an amplitude of a first part of the waveguide structure and a cycle of the first part gradually changes in the longitudinal direction. Therefore, reflection of the slow-wave structure can be reduced, backward wave oscillation can be effectively suppressed, and a wider operating bandwidth can be obtained.