56 results about "Wave tube" patented technology

The utility model relates to the technical field of automobile radiators, and discloses an automobile radiator pipe root reinforcing structure which comprises a first mounting plate and a second mounting plate, a radiating pipe is fixedly connected between the first mounting plate and the second mounting plate, the middle of the radiating pipe is fixedly connected with a corrugated pipe, and the corrugated pipe is fixedly connected with the corrugated pipe. The outer side of the heat dissipation pipe is fixedly connected with a stretching block and a fixing block, the outer side of the heat dissipation pipe is provided with a strengthening assembly, the strengthening assembly comprises a first connecting block, the first connecting block is arranged on the outer side of the heat dissipation pipe in a sleeving mode, the outer side of the heat dissipation pipe is fixedly connected with a second connecting block, and the outer side of the stretching block is provided with a curved surface and an inclined surface. A plurality of heat dissipation pipes are specifically arranged. According to the structure, under the cooperation of the corrugated pipe, the heat dissipation pipe, the first mounting plate, the second mounting plate, the stretching block and other structures, a multi-direction and multi-angle fastening mode is formed, the reinforced fastening effect of the structure is achieved, and the practicability of the structure is effectively improved.

The utility model discloses a groove type CPED high-pressure spraying device which is applied to the field of groove type spraying and comprises a shell, a cover body is hinged to the top of the shell, a water passing plate located in the shell is arranged at the bottom of the cover body, and the top of the water passing plate is communicated with a pipeline penetrating into the cover body. When the groove-type CPED high-pressure spraying device is used, a wave tube can be matched with the rotary joint for water feeding, then the rotary joint transmits water to the pipeline and a water passing plate, and the water passing plate is connected with the water passing plate in a threaded mode to enable the water passing plate to pass through the water passing plate. And the spraying head is matched with the water passing plate to discharge water, so that the spraying effect is realized. And meanwhile, a water passing plate is driven to rotate through operation of a rotating motor, so that uniform spraying use of the spraying head on internal parts of the shell is realized. Through the arrangement, the spraying uniformity of groove type spraying is improved, and the use convenience of the device can be improved.

The embodiment of the present application discloses a kind of travelling wave tube slow wave structure welding mould, including the welding upper die and welding lower die of opposite arrangement;Positioning cylinder between the welding upper die and welding lower die;And the centering rod that passes through the welding upper die and welding lower die;The welding upper die and welding lower die are connected by screw rod and form welding support, two ends of the positioning cylinder are respectively with the welding upper die and welding lower die abut, the centering rod is located in the inner cavity of the positioning cylinder;To be welded slow wave structure is contained in the inner cavity of positioning cylinder, the centering rod includes first centering rod and second centering rod, the first centering rod is arranged in the electron beam passage of to be welded slow wave structure, and the second centering rod is arranged in the pin hole of to be welded slow wave structure.The improvement of slow wave structure degree, perpendicularity is realized, and the pipe body horizontal direction torsion is reduced, and the flow rate of further high-power travelling wave tube and yield rate are improved.

The invention relates to the technical field of vacuum electronics, and discloses a large-radius spiral waveguide slow wave device (including a traveling wave tube and a backward wave tube). The high-frequency structure of the novel slow-wave device is a two-dimensional periodic slow-wave structure formed by spirally winding a rectangular waveguide along a large-radius cylindrical surface. The transverse size of an electron beam channel can be greatly increased by increasing the spiral radius, so that higher injection electron beam power (under the same current density) is provided, and the output power is greatly improved. Compared with an existing slow-wave device, the large-radius spiral waveguide slow-wave device has the advantages that the output power can be greatly improved (in magnitude), and the bottleneck that the power of an existing vacuum electronic slow-wave device is limited can be broken through.

The invention discloses an improved tempered glass air cooling channel and a cooling method thereof, and relates to the technical field of glass deep processing equipment.The improved tempered glass air cooling channel comprises a channel, a plurality of rotating shafts driven by an external motor are rotationally installed on the lower portion of the interior of the channel, and a plurality of evenly-distributed conveying wheels are installed on the outer side of each rotating shaft in a sleeving mode; the conveying wheels located on the outer sides of every two adjacent rotating shafts are sequentially distributed in a staggered mode, a plurality of evenly-distributed corrugated pipes are further installed on the lower portion of the interior of the channel in a penetrating mode, a plurality of auxiliary air nozzles are connected to the ends of the corrugated pipes in a penetrating mode, and a plurality of main air nozzles are connected to the middles of the corrugated pipes in a penetrating mode. The auxiliary air taps and the conveying wheels are distributed in a penetrating mode in the transverse direction, and a plurality of upper air tap rows are connected to the upper portion of the interior of the channel in a penetrating mode. The improved tempered glass air cooling channel and the cooling method thereof disclosed by the invention have the effects of improving the finished product quality and the working efficiency.

Provided in the present application are a traveling-wave tube, a transmitter, an electronic device and a signal processing method. The traveling-wave tube comprises an input apparatus, an electron emission apparatus, a plurality of slow-wave structures and an output apparatus, wherein at least one transmission channel is formed in the plurality of slow-wave structures, and the number of transmission channels is less than the number of slow-wave structures; the input apparatus is used for receiving a plurality of radio-frequency signals and feeding the plurality of radio-frequency signals into the plurality of slow-wave structures; the electron emission apparatus is used for emitting an electron beam into the at least one transmission channel of the plurality of slow-wave structures; the plurality of slow-wave structures are used for respectively receiving the plurality of radio-frequency signals, and using the electron beam to respectively amplify the plurality of radio-frequency signals, so as to obtain a plurality of amplified radio-frequency signals; and the output apparatus is used for outputting the plurality of amplified radio-frequency signals. The present application can reduce the volume of a traveling-wave tube, thereby decreasing the cost of the traveling-wave tube.

The invention discloses a wiring terminal production laser cutting device and process, and relates to the field of laser cutting devices.The wiring terminal production laser cutting device comprises a machine body, bases are symmetrically installed at the top of the machine body, and the tops of the bases are connected with a positioning plate through air cylinders; a dust collection wave tube is rotationally arranged at the top of the positioning plate, a swing range adjusting assembly for the dust collection wave tube is arranged in the positioning plate, the two sides of the dust collection wave tube are connected with the inner side faces of the long ends of side plates, and the side plates and the dust collection wave tube form a fan-shaped dust collection structure; a base plate is arranged on the outer end face of the positioning plate, a clamping spring is arranged between the outer end face of the positioning plate and the base plate, and a pre-tightening force adjusting assembly of the clamping spring is arranged in the positioning plate. According to the laser cutting device and process for wiring terminal production, through linkage operation of clamping positioning, synchronous dust collection range adjustment, reciprocating swing dust collection and pre-tightening force adjustment, wiring terminal clamping, cutting dust efficient cleaning and clamping force self-adaption are achieved, and the laser cutting quality is improved.

The utility model relates to the technical field of heat exchangers, in particular to a corrugated tube sleeve type fixed tube sheet heat exchanger, which comprises a heat exchanger main body, corrugated tubes are uniformly distributed in the heat exchanger main body, tube joints are uniformly and integrally arranged outside the corrugated tubes at intervals, sleeves are sleeved outside the corrugated tubes, and the length of the sleeves is larger than that of the corrugated tubes. A first flow guide plate and a second flow guide plate are further arranged on the two sides between the corrugated pipe and the sleeve respectively, a second fixing pipe plate and a first fixing pipe plate are arranged at the two ends of the corrugated pipe and the two ends of the sleeve respectively, and a barrel is arranged on the heat exchanger body. According to the corrugated tube sleeve type fixed tube sheet heat exchanger, the sleeve is arranged outside the corrugated tube, so that three fluids which are not communicated with one another can respectively circulate in the corrugated tube, between the corrugated tube and the sleeve and outside the sleeve, and the flow guide plates are designed between the corrugated tube and the sleeve, so that the impact of the fluids can be increased, and the heat exchange effect of the heat exchanger is improved; and the stability of the connection between the corrugated pipe and the sleeve is ensured.

The invention provides a magnetic focusing system for a terahertz strip beam traveling wave tube, and belongs to the technical field of vacuum electronic devices. According to the system, a group of parallel long-strip-shaped magnets are arranged on a main magnet at certain intervals, the distance between the long-strip-shaped magnets is adjusted at the same time through a synchronous knob, and a proper magnetic field is generated in a slow-wave structure channel and used for focusing a banding beam so as to prevent the banding beam from diverging and being intercepted by the inner wall of the channel; meanwhile, the main magnets and the long-strip-shaped magnets are arranged at intervals and used for eliminating most of unnecessary Bx components near the center of an electron beam channel, so that a magnetic field generated by the magnets can better focus the banding beam, and the flow rate of the banding beam is effectively improved.

The design method of the micro-structure in the gas wave channel for pressurization and vortex elimination of the present invention belongs to the technical field of pressurization of a rotating hub type shock wave refrigerator, and relates to a design method of the micro-structure in the gas wave channel for pressurization and vortex elimination. This method first constructs a numerical simulation model of the gas wave tube to analyze the gas flow state during the refrigeration cycle of the channel and analyze the cause of the turbulent vortex at the leading edge of the channel during the high-pressure intake stage. Secondly, based on the passive control theory of wall turbulence, the thickness of the viscous sublayer at large Reynolds numbers and the actual channel interval thickness, the feasible processing size range of the tube wall micro-structure is determined, and orthogonal simulation comparison is carried out to analyze the specific influence of the micro-structure morphology under different depth-width ratios on the turbulent vortex. Finally, the optimal micro-structure size parameters for pressurization and vortex elimination are obtained. This method has the characteristics of strong versatility, simple calculation process, high processing feasibility, etc. Without changing the macroscopic flow characteristics of the existing channel, this method has important practical application value for improving the refrigeration efficiency of the gas wave refrigerator.

This disclosure relates to a refrigerant compressor including a diffuser with one or more quarter wave tubes. The compressor is used in a heating, ventilation, and air conditioning (HVAC) chiller system, for example.

The invention discloses a broadband coaxial-circular waveguide output structure of a coaxial gyrotron traveling wave tube, and relates to the field of microwave and millimeter wave passive devices. The structure comprises a coaxial outer conductor, a coaxial inner conductor and a supporting structure arranged between the coaxial outer conductor and the coaxial inner conductor, the supporting structure comprises a plurality of supporting units distributed along the circumference, the widths of the supporting units are increased and then reduced along the axial direction, and the middle sections of the adjacent supporting units are quasi-rectangular waveguide cavities; two cavities with the two ends communicated are dug in the coaxial inner conductor, and the coaxial inner conductor, the supporting unit and the coaxial outer conductor are provided with penetrating through holes used for injecting cooling liquid into the cavity and enabling the cooling liquid to flow out of the other cavity. The supporting structure is adopted to solve the supporting problem of the output part of the coaxial gyrotron traveling wave tube, and has the advantages of wide band and high mode conversion efficiency; in addition, through the arrangement of the through hole and the cavity structure, the cooling of the output part of the coaxial gyrotron traveling wave tube is realized.

The invention discloses an all-metal slow-wave structure with a periodically slotted flat plate structure loaded with a rectangular waveguide, which is characterized in that a double-F-shaped slot structure is periodically etched on a metal flat plate, and the periodically slotted flat plate is embedded into the rectangular waveguide to form an all-metal slow-wave structure, so that a double-strip electron beam channel is formed. The structure greatly enhances the longitudinal field intensity at an electron beam channel, has higher coupling impedance than that of a conventional slow wave structure at the frequency band, keeps lower synchronous voltage, and can simultaneously realize synchronization of forward wave / backward wave regions. In addition, the structure also has the advantages of all-metal structure, open internal space, heat dissipation convenience, simple structure and easiness in processing. Therefore, the structure provided by the invention is particularly suitable for designing W-band traveling wave tube amplifiers or backward wave oscillators with relatively high interaction electron efficiency and output power.

The present invention discloses a P-band full-cavity extraction relativistic magnetron, which belongs to the field of high-power microwave technology. It includes a vacuum chamber, an anode, an axial extraction structure, and a cathode arranged inside the anode, which are connected in sequence along the axial direction; wherein the anode includes an anode shell, N large fan-shaped anode blades and N small fan-shaped anode blades, and there is a fan-shaped gap between the outer side of the small fan-shaped anode blades and the anode shell; the axial extraction structure includes a mode conversion section and a coaxial output section. The present invention proposes a P-band full-cavity extraction relativistic magnetron, which reduces the guide magnetic field compared to the relativistic backward wave tube; improves the energy conversion efficiency compared to the magnetic isolation line oscillator; and reduces the radial size and improves the compactness of the system compared to the relativistic magnetron with a traditional full-cavity extraction structure. Therefore, the full-cavity extraction relativistic magnetron of the present invention takes into account compactness, low magnetic field, and high efficiency while ensuring fundamental mode output.

The invention discloses a sampling device for waste treatment atmosphere non-point source emission quantification, and belongs to the technical field of gas sampling equipment.The sampling device comprises a sampling ship body, the sampling ship body comprises a cuboid frame with three faces enclosed, hollow quadrangular frames are installed at the two ends of the cuboid frame, and ventilation openings are formed in one ends of the two hollow quadrangular frames; the two hollow quadrangular frames are respectively used as a gas outlet and a gas inlet, the gas inlet is communicated with a gas pump, the gas pump is communicated with a gas inlet corrugated pipe, the sampling ship body is detachably connected with a floating body, the two hollow quadrangular frames are respectively communicated with a Teflon gas pipe, the other ends of the Teflon gas pipes are respectively communicated with different interfaces of a gas path exchange valve, and the gas path exchange valve is communicated with a gas analyzer. Continuous automatic online monitoring of solid and liquid atmospheric surface sources can be realized by loading and unloading the floating body, the defects of limited environment, low time resolution, low automation degree and the like when a traditional gas sampling device is used on the water surface are overcome, and the sampling efficiency, precision and reliability are greatly improved.

The utility model discloses a no-clean range hood, including casing, air-inlet grille, high voltage discharge plate and composite ultraviolet light wave tube, air-inlet grille is provided at the air inlet of casing, the high voltage discharge plate is provided behind the air passage of air-inlet grille, the composite ultraviolet light wave tube is provided behind the air passage of high voltage discharge plate. According to the range hood, the high-voltage discharge plate and the composite ultraviolet light wave tube are arranged in the machine shell, so that oil fume is decomposed and completely purified in the range hood, grease is prevented from being accumulated in the range hood, and the effects that the interior of the machine shell is free of cleaning, and exhausted gas is free of oil fume are achieved.

A slow-wave structure, a traveling-wave tube, and a communication apparatus are provided. The slow-wave structure includes a tube housing, a slow-wave line, and a plurality of support portions. The slow-wave line and the plurality of support portions are all located inside the tube housing, and the tube housing, the slow-wave line, and the plurality of support portions are integrally connected. The plurality of support portions are sequentially spaced apart along the slow-wave line. One end of each support portion is connected to the tube housing, and the other end is connected to the slow-wave line.

The application belongs to the field of vacuum electron devices, and particularly relates to a kind of attenuation solving method of G-band edge alignment staggered grid row wave tube high-frequency structure.The attenuation quantity definition of passive device is introduced into the high-frequency structure of active device-G-band edge alignment staggered grid row wave tube for the first time, and the solving method of the change rate of time-averaged radio frequency power P along the axial direction used in the solving of attenuation constant of existing high-frequency structure is deviated, the solving formula of attenuation constant of G-band edge alignment staggered grid row wave tube high-frequency structure is obtained by starting from the basic theory of attenuation and transmission, deduction and numerical verification, the attenuation constant solved can support 3-dimensional large signal nonlinear beam-wave interaction solver BWISFW calculation, and compared with CST-PIC, the calculation results are consistent.The attenuation constant calculation method provided by the application is especially suitable for G-band edge alignment staggered grid row wave tube high-frequency structure, and is helpful to shorten the development cycle and reduce the production cost.

An electromagnetic power source (100, Fig. 1), e.g. a cylindrical or co-axial cavity gyrotron, surface wave source, klystron or travelling wave tube, configured to generate microwave or terahertz power modes for heating plasma in a nuclear fusion reactor (300, Fig. 6) is described. The power source comprises an excitation cavity 108 configured to generate an electromagnetic power mode 112, wherein the excitation cavity comprises a first, inner layer 122 thermally coupled to a second, outer layer 124, wherein the first layer comprises electrically conducting metal, e.g. copper, silver or gold, and the second layer comprises diamond. The diamond of the second layer may be a metal composite diamond or may be formed by chemical vapour deposition (CVD). The second layer may, for example, comprise: a unitary structure; a plurality of coaxially stacked, hollow cylindrical or toroidal segments (130, Fig 8a); or a plurality of rectangular bars joined using a brazing or bonding material (123, Fig. 4).

The invention belongs to the technical field of high-power microwaves, and particularly relates to an ultra-high-power ultra-large-radius coaxial backward wave tube which is particularly suitable for national defense and military application. According to the ultra-large-radius coaxial corrugated backward wave tube, on the basis that the difference between the inner radius and the outer radius of a fundamental wave (TEM wave) is not changed, by increasing the center radius of a slow wave device and keeping the electron beam voltage and current density unchanged, the input current is increased in an equal proportion mode, and the output power is increased in a year-on-year mode. The problem that the power of an existing slow-wave device is limited can be solved.

The utility model relates to the technical field of sealing valves, in particular to a reinforced corrugated pipe sealing valve which comprises a valve body, a valve clack is arranged in the valve body, a corrugated pipe is arranged on the valve clack, a valve rod is arranged on the surface of the valve clack, the corrugated pipe is sleeved on the valve rod, and a reinforcing spring is arranged between the corrugated pipe and the valve rod. A plurality of fastening screws are arranged on the surface of the upper sealing plate, and the upper end of the corrugated pipe is clamped between the upper sealing plate and the valve body; the corrugated pipe valve has the beneficial effects that when the corrugated pipe valve is used, the upper sealing plate can be detached from the surface of the valve body by rotating the fastening screw rod on the surface of the upper sealing plate, so that the interior is convenient to repair and maintain, and the reinforcing spring positioned between the corrugated pipe and the valve rod can play a role in supporting and buffering, so that the abrasion of the corrugated pipe is reduced, the overall sealing performance is improved, and the service life of the corrugated pipe is prolonged. The service life of the corrugated pipe sealing valve is prolonged, the reliability of equipment operation is improved, and the leakage problem caused by long-term compression deformation of the corrugated pipe is avoided.

The application discloses an ultrahigh-power Cherenkov radiation generator, and solves the problems of low output power, low conversion efficiency and narrow frequency modulation range of a current frequency modulation waveform generated by a relativistic backward wave tube, and specifically comprises a ring cathode, a coaxial reflector, a non-uniform slow wave structure, a uniform slow wave structure, a coaxial coupling structure and a magnetic field coil which are coaxially connected in sequence at the back side of the ring cathode; the non-uniform slow wave structure and the uniform slow wave structure are both overmoded structures, compared with a single-mode structure, the device power capacity is improved, and meanwhile, the device can work at a higher working voltage, which is beneficial to generating ultrahigh power.

This invention discloses a filter media wave tube laying and installation device for saline-alkali land treatment, comprising: a laying and installation device operating platform, a filter media wave tube loading box, and an electric telescopic rod body. A fixing limiting tooth is fixedly installed on the upper end of the laying and installation device operating platform, a filter media wave tube support inclined frame is fixedly installed on the upper end of the operating platform, and the filter media wave tube body is disposed on the upper end of the support inclined frame. The filter media wave tube loading box is fixedly installed on the upper end of the operating platform, and a limiting plate is fixedly installed on the inner end of the loading box. A clamping mechanism mounting plate is fixedly installed on the lower end of the electric telescopic rod body, and a miniature electric telescopic rod is fixedly installed on the inner end of the clamping mechanism mounting plate. This filter media wave tube laying and installation device for saline-alkali land treatment facilitates automatic clamping and unloading, is easy to operate, automatically transfers materials, assists in laying, has high work efficiency, and saves time and labor.

The utility model belongs to the technical field of water quality detection, and particularly relates to a compact folding mechanism for saving space, which comprises a vacuum pump, the output end of the vacuum pump is communicated with a multi-angle corrugated tube, and one end of the multi-angle corrugated tube is communicated with a first detection mechanism. The first detection mechanism comprises an outer corrugated pipe communicated with one end of the multi-angle corrugated pipe, an inner corrugated pipe is movably sleeved with the outer corrugated pipe, the interior of the outer corrugated pipe is communicated with the exterior of the inner corrugated pipe, a collection mechanism is arranged at the bottom of the inner corrugated pipe, and a second detection mechanism is arranged at the bottom of the inner corrugated pipe. Water can enter a water source inlet at any angle through the arranged multi-angle corrugated pipe, water can be taken from water sources at different depths at the same time through the arranged first detection mechanism, second detection mechanism and collection mechanism, and the equipment is easy to use and recycle, can be disassembled and stored, and is convenient to use. And the first detection mechanism and the second detection mechanism are compressed, so that the space is saved.

The present invention discloses an ultrafast, shape-modulated relativistic backward wave tube with a coaxial premodulation cavity, aiming to solve the technical problem of low microwave generation efficiency in existing relativistic backward wave tubes. Specifically, the device comprises an annular cathode and a coaxial premodulation cavity, a resonant reflector, a first-segment slow-wave structure, a drift segment, a second-segment slow-wave structure, an extraction cavity, an output waveguide, and a magnetic field coil disposed on the periphery of the structure, which are sequentially arranged behind the annular cathode. The annular cathode is used to emit an annular relativistic electron beam under the action of a high-voltage pulse. The magnetic field coil is used to provide a guiding magnetic field for the annular relativistic electron beam. The coaxial premodulation cavity comprises a coaxially packaged outer conductor tube and an inner conductor tube. The outer conductor tube is connected to the annular cathode and the resonant reflector at both ends, respectively. The inner conductor tube is sealed at both ends. The inner wall of the outer conductor tube is provided with three annular outer grooves and two outer drift segments. The outer wall of the inner conductor tube is provided with three annular inner grooves and two inner drift segments.

The utility model discloses a cutting device with a waste recovery structure, which belongs to the field of cutting devices and is characterized in that a sliding chute of a first support is connected with a limiting seat, the limiting seat is connected with an adjusting seat, one end of the limiting seat is connected with an adjusting screw rod, the adjusting screw rod is connected with the adjusting seat, and a clamping groove for a corrugated pipe to be cut is formed between the adjusting seat and the limiting seat; the sliding groove of the second support is connected with an electric push rod and a sliding device, the upper end of the sliding device is connected with a sliding seat, and the side wall of the sliding seat is connected with a cutting blade. The cutting adjusting mechanism accurately controls the position of the corrugated pipe through cooperation of a limiting seat, an adjusting seat and an adjusting screw rod, and accurate and efficient cutting is ensured. Due to the control, the cutting quality is improved, waste materials are reduced, and the material utilization rate is increased; the waste collecting mechanism effectively collects cutting waste through the design of a collecting cover and a horn cover. The collecting cover is aligned with a cutting point to ensure timely and complete collection of waste materials, keep the environment clean, reduce scattering and flying, and reduce interference and harm to operators.

The application discloses a travelling wave tube power amplifier helix welding clamp, which comprises a support, an inner support cylinder horizontally arranged along the front-back direction is arranged on the upper portion of the support, three main clamping blocks and three auxiliary clamping blocks are radially and equiangularly connected to the inner circumferences of the inner support cylinder, the main clamping blocks and the auxiliary clamping blocks are equiangularly and staggeredly arranged, the main clamping blocks on the upper portion of the inner support cylinder are vertically upward, and the auxiliary clamping blocks on the bottom of the inner support cylinder are vertically downward. When the application is used, the clamping rods and the helix along the front-back horizontal direction are sequentially put into the second channel and the third channel, then the two main clamping blocks on the bottom of the inner support cylinder are made close to each other by the distance adjusting mechanism to clamp the helix, then the clamping rods along the front-back horizontal direction are sequentially put into the first channel and the fourth channel, then the two clamping rods are respectively in contact with the left and right sides of the helix, and then the main clamping blocks and the auxiliary clamping blocks on the upper portion of the inner support cylinder are made close to each other by controlling the distance adjusting mechanism.

A low-frequency-band convolution backward wave tube structure disclosed by the present invention comprises a cut-off transition section, an interaction section and an output transition section which are coaxially connected in sequence, the cut-off transition section is internally provided with a cathode structure, the interaction section is cylindrical, the interior of the interaction section is in a vacuum state, the interior of the interaction section is connected with a metamaterial unit sequence, and the output transition section is internally connected with a collector. The metamaterial unit sequence comprises a plurality of three-elliptical-ring metamaterial units which are connected at intervals in the axial direction of the interaction section, a dislocation angle is formed between every two adjacent three-elliptical-ring metamaterial units, the metamaterial unit sequence provides backward waves in the interaction section, and under the action of an external voltage and an axial magnetic field, the metamaterial unit sequence can generate a three-elliptical-ring metamaterial. The cut-off transition section reflects the backward wave back to the interaction section and cuts off the wave with the frequency lower than 2.41 GHz, the metamaterial unit sequence enables electromagnetic energy to be directed to a TE11 mode, the output transition section radiates the electromagnetic energy in the TE11 mode, and a miniaturized structure of the TE11 mode can be achieved at a low frequency band.

A slow-wave structure, a traveling-wave tube, and a communication apparatus are provided. The slow-wave structure includes a tube housing, a slow-wave line, and a plurality of support portions. The slow-wave line and the plurality of support portions are all located inside the tube housing, and the tube housing, the slow-wave line, and the plurality of support portions are integrally connected. The plurality of support portions are sequentially spaced apart along the slow-wave line. One end of each support portion is connected to the tube housing, and the other end is connected to the slow-wave line. This application can address processing and assembly errors caused by a discrete design, and simplifies assembly, thereby shortening an overall production cycle of the traveling-wave tube, and improving yields and consistency of the traveling-wave tube.

The utility model relates to the technical field of wave tube cleaning, in particular to an ultraviolet water treater glass tube cleaning mechanism which comprises a shell and a cleaning module, the cleaning module comprises a cleaning plate, a cleaning lantern ring, a jet flow plate, a pressing ring and a driving assembly, the cleaning plate is arranged in the shell, an opening is formed in the surface of the cleaning plate, and the jet flow plate is arranged in the opening. A plurality of wing plates are evenly arranged on the surface of the jet flow plate, the pressing ring is in bolted connection with the cleaning plate and located on one side of the opening, the cleaning lantern ring is connected with the jet flow plate in a clamped mode and located on one side of the jet flow plate, and the driving assemblies are arranged at the two ends of the cleaning plate. The use performance of the glass tube is influenced.