249results about "Travelling-wave tubes" patented technology

The invention provides a double-cycle magnetic focusing system and a traveling wave tube. The double-cycle magnetic focusing system comprises an integrally-formed pole shoe structure and magnetic steel coaxial with the pole shoe structure. The pole shoe structure comprises a channel penetrating in the axial direction of the pole shoe structure and a plurality of periodic annular grooves formed in the side wall of the outer circumferential face of the pole shoe structure. The annular grooves are axially arranged along the pole shoe structure and are coaxial with the channel; the channel is used for accommodating a slow wave circuit; the magnetic steel is annular and is fixed in the annular groove; an annular boss is formed in the annular groove; an annular groove body used for containing the annular boss is formed in the side wall of the inner circumferential face of the magnetic steel. According to the double-cycle magnetic focusing system, the good focusing state of electron beams can be kept, meanwhile, use of a non-magnetic spacer ring is avoided, the process step of multi-welding-seam welding of the pole shoe spacer ring is eliminated fundamentally, the production efficiency is greatly improved, and the air leakage risk is reduced.

The invention provides a multistage depressed collector for an ultra wide band traveling wave tube. The multistage depressed collector comprises an insulating porcelain cylinder with an inner cavity, an inner collector accommodated and fixed in the inner cavity of the insulating porcelain cylinder, and an outer collector fixedly arranged on the outer wall of the insulating porcelain cylinder, the inner collector comprises a preceding-stage collector and a final-stage collector which are arranged along the axial direction of the insulating porcelain cylinder; the preceding-stage collector comprises a top wall part, a through hole for an electron beam to pass through is formed in the top wall part, and the surface of one side, facing the last-stage collector, of the top wall part comprises a protruding structure protruding towards the last-stage collector. The collector can effectively restrain reflection of secondary electrons, reduce the electron backflow rate, achieve high recovery efficiency and improve the efficiency of the ultra-wideband traveling wave tube.

SOLUTION: To joint vacuum electronic devices (VEDs) having a plurality of two-dimensional layers formed of different materials and create at least one VED at the same time, a two-dimensional material layer being mechanically processed to include features necessary for device operations to form features of a three-dimension when the two-dimensional material layer is assembled and is joined and becomes a three-dimensional structure and the two-dimensional layers being joined together to have a structure similar to a sandwich.EFFECT: This manufacturing step makes it possible to built in a metal material, a magnetic material, a ceramic material, and other materials which are necessary to manufacture a VED while maintaining a required positional accuracy and a large number of devices for a batch capacity.SELECTED DRAWING: Figure 1

The invention provides a structure for improving electron beam energy distribution after beam-wave interaction. The structure comprises a traveling wave interaction circuit, a standing wave interaction circuit and a step-down collector which are sequentially arranged in the electron beam transmission direction. The standing wave interaction circuit comprises a resonant cavity; an electron beam channel of the traveling wave interaction circuit is communicated with an electron beam channel of the standing wave interaction circuit; and the step-down collector is communicated with an electron beam channel of the standing wave interaction circuit. The structure can solve the problem that the whole optimization process becomes more complex due to the existing mode of improving the energy recovery efficiency by optimizing the traveling wave interaction circuit.

The invention discloses a slow wave structure, a traveling wave tube and network equipment, and relates to the technical field of vacuum electronics. The slow-wave structure comprises a shell, a slow-wave transmission line, an input coupler and an output coupler, the shell comprises a first shell cover and a second shell cover which are connected in a stacked mode in the first direction, so that the slow-wave structure is of a stacked structure, the slow-wave transmission line is located on a first plane perpendicular to the first direction, and the input coupler and the output coupler are electrically connected with the slow-wave transmission line. At least one of the input coupler and the output coupler is not coplanar with the first plane, so that the at least one of the input coupler and the output coupler has good consistency with the stacking direction, the production and assembly of the input coupler and / or the output coupler are simplified, the integration level of the input coupler and the output coupler is improved, and the cost is reduced. And miniaturization of the slow wave structure is realized.

The present invention relates to the technical field of vacuum electronic devices, and provides an electron gun frame, comprising an insulating porcelain seat, a first anode seat and a second anode seat arranged on the insulating porcelain seat, and a positioning member for fixing the first anode seat and the second anode seat, wherein the insulating porcelain seat comprises an insulating porcelain ring, and at least two positioning block groups evenly distributed along the circumference of the top surface of the insulating porcelain ring, each positioning block group comprises a first positioning block, a second positioning block and a third positioning block, the first positioning block, the second positioning block and the third positioning block are arranged in sequence and equidistantly, the setting heights of the first positioning block, the second positioning block and the third positioning block are successively larger, and each of the first positioning block, the second positioning block and the third positioning block is fixedly connected to the first anode seat, the second anode seat and the positioning member respectively by a clamping method. The present invention solves the technical problem that the miniaturized traveling wave tube in the prior art cannot meet the requirements in terms of weight reduction, processing, assembly and precision.

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 relates to the field of high-frequency electronics, and discloses an ultra-wideband traveling wave tube which comprises a focusing control electron gun, a slow wave system and a three-stage depressed collector. The focusing control electron gun is used for providing stable electron beams and realizing effective focusing and acceleration of the electron beams through a cathode assembly, a heating wire, a bunching electrode and an anode assembly which are accurately designed; the slow wave system is composed of an input high frequency and an output high frequency, high-efficiency energy exchange between an input signal and an electron beam is ensured through a conical spiral line and a composite tube shell structure, and therefore signal amplification is achieved. The three-stage depressurization collector effectively recovers residual electron beams through a step-by-step depressurization design, energy loss is reduced, and the total efficiency of the traveling wave tube is improved. The traveling wave tube can provide output power exceeding 100 W in the frequency band of 2-18 GHz, the gain is larger than 25 dB, and the total efficiency is larger than 30%. Due to the excellent performance, the method can be widely applied to the fields of communication, radar, electronic countermeasures and the like.

Vacuum electron devices (VEDs) having a plurality of two-dimensional layers of various materials are bonded together to form one or more VEDs simultaneously. The two-dimensional material layers are machined to include features needed for device operation so that when assembled and bonded into a three-dimensional structure, three-dimensional features are formed. The two-dimensional layers are bonded together into a sandwich-like structure. The manufacturing process enables incorporation of metallic, magnetic, ceramic materials, and other materials required for VED fabrication while maintaining required positional accuracy and multiple devices per batch capability.

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.

The present invention belongs to the technical field of space traveling wave tubes, and specifically provides a method and system for preparing an attenuator. The method for preparing the attenuator includes using a vacuum coating machine to coat a carbon film on the area to be coated in the clamping rod to form a coated area, and the actual thickness value of any point in the coated area is not lower than a preset value; axially dividing the coated area along the clamping rod into multiple sub-areas, measuring the resistance of each sub-area, and calculating the actual thickness value of the carbon film in each sub-area according to the resistance of the sub-area, the size of the clamping rod, the length of the sub-area, and the resistivity of the carbon film; comparing the actual thickness value of each sub-area with the preset value, and using laser ablation to remove the carbon film with excessive thickness.

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.

The invention relates to the field of electron tubes, and discloses a low-evaporation three-layer film cathode assembly for a space traveling wave tube, which comprises a tungsten substrate positioned on a substrate; the first layer of rhenium film and the rhenium film cover the tungsten substrate; the carbon nanotube composite material layer is deposited on the rhenium film; the second osmium-tungsten film is deposited on the carbon nanotube layer; the third osmium-ruthenium film is deposited on the osmium-tungsten film; wherein the thicknesses of the rhenium film, the carbon nanotube layer, the osmium-tungsten film and the osmium-ruthenium film are respectively controlled to be 0.5-2 mu m, 10-50 nm, 50-200 nm and 20-100 nm, and the carbon nanotube composite material layer is obtained by growing on the rhenium film through chemical vapor deposition. By adopting the osmium-tungsten and osmium-ruthenium films with high crystallinity and the optimized carbon nanotube composite material layer, the electron emission efficiency of the cathode assembly is remarkably improved, so that the energy required by electron emission is reduced, and the electron output quantity under the same working condition is increased.

Vacuum electron devices (VEDs) are produced having a plurality of two-dimensional layers of various materials that are bonded together to form one or more VEDs simultaneously. The two-dimensional material layers are machined to include features needed for device operation so that when assembled and bonded into a three-dimensional structure, three-dimensional features are formed. The two-dimensional layers are bonded together using brazing, diffusion bonding, assisted diffusion bonding, solid state bonding, cold welding, ultrasonic welding, and the like. The manufacturing process enables incorporation of metallic, magnetic, and ceramic materials required for VED fabrication while maintaining required positional accuracy and multiple devices per batch capability. The VEDs so produced include a combination of magnetic and electrostatic lenses for electron beam control.

The invention discloses a miniaturized periodic permanent magnet focusing metamaterial backward wave oscillator, which comprises a metamaterial slow wave structure, a coupling cavity, a periodic permanent magnet focusing system and a coaxial output interface, the metamaterial slow-wave structure comprises a waveguide shell, a periodic resonance structure and a first vacuum gap; the coupling cavity comprises a coupling cavity shell, a coupling cavity inner conductor and a second vacuum gap; the coupling cavity inner conductor is connected with the periodic resonance structure and the coaxial output interface; the periodic permanent magnet focusing system comprises a first permanent magnet focusing structure and a second permanent magnet focusing structure which are asymmetrically arranged up and down, and the metamaterial slow wave structure is arranged between the first permanent magnet focusing structure and the second permanent magnet focusing structure. According to the backward wave oscillator, the metamaterial slow wave structure and the periodic permanent magnet focusing system are arranged, and the coupled cavity is multiplexed as the collector, so that the size of the backward wave oscillator is reduced. And an asymmetric focusing magnetic field is generated through the asymmetrically arranged periodic permanent magnet focusing system, so that electron beams can perform energy exchange better.

This application provides a travelling-wave tube, an electron gun, and a power amplification system, to improve electronic efficiency of the travelling-wave tube when the travelling-wave tube performs linear amplification on a radio frequency signal, thereby effectively reducing power consumption of the travelling-wave tube. The travelling-wave tube includes an input apparatus, a control circuit, an electron gun, a slow-wave circuit, and an output apparatus. The input apparatus may be configured to: receive a radio frequency signal, and feed the radio frequency signal into the slow-wave circuit. The control circuit may be configured to: determine a quantity N of electron beams and currents of the N electron beams, and control the electron gun to emit the N electron beams. Further, the slow-wave circuit may perform beam-wave interaction with the N electron beams, to amplify power of the radio frequency signa, and because the slow-wave circuit works in a saturation region, electronic efficiency of the travelling-wave tube can be greater than or equal to a first threshold. The output apparatus may output an amplified radio frequency signal.

The invention provides a slow wave structure, a terahertz traveling wave tube device and a communication device. According to the slow wave structure provided by the invention, the first sub slow wave structure and the second sub slow wave structure are ingeniously combined, so that the technical problem of insufficient output power in the prior art can be effectively solved. Specifically, the first sub-slow-wave structure performs cluster modulation on the electron beam through preset strong coupling impedance, so that the density and the modulation efficiency of the electron beam are improved; and the second slow wave sub-structure ensures that the electron beams subjected to cluster modulation can efficiently export microwave energy through the design of low transmission loss, so that the energy loss is obviously reduced. Through the innovative structural design, higher output power can be provided at a high frequency band, attenuation of microwave signals is effectively reduced, the overall performance of the system is improved, and the application requirements of high power and high efficiency are met.

The application discloses a broadband folded full-metal slow wave structure, which comprises a first grid body and a second grid body arranged in a central symmetry; the first grid body and the second grid body enclose an electron beam channel; the first grid body comprises a plurality of metal grids arranged at equal intervals along a direction of a traveling wave; a cross section of the metal grid along the direction of the traveling wave comprises a first rectangular section, a trapezoidal section and a second rectangular section connected in sequence; the first rectangular section is provided with an arc-shaped opening with an opening direction away from the trapezoidal section; the arc-shaped opening comprises a first opening and a second opening; a hollowed-out part of the first opening is a rectangular body, and a hollowed-out part of the second opening is a semi-cylindrical body. By setting the hollowed-out part of the first opening as the rectangular body and the hollowed-out part of the second opening as the semi-cylindrical body, a ring-shaped tip of the slow wave structure is prevented, the slow wave structure is easy to manufacture, the dispersion characteristic is improved to expand a bandwidth, high-frequency loss is reduced, and output power, gain, bandwidth and interaction efficiency of the traveling wave tube 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.

Vacuum electron devices (VEDs) are produced having a plurality of two-dimensional layers of various materials that are bonded together to form one or more VEDs simultaneously. The two-dimensional material layers are machined to include features needed for device operation so that when assembled and bonded into a three-dimensional structure, three-dimensional features are formed. The two-dimensional layers are bonded together using brazing, diffusion bonding, assisted diffusion bonding, solid state bonding, cold welding, ultrasonic welding, and the like. The manufacturing process enables incorporation of metallic, magnetic, and ceramic materials required for VED fabrication while maintaining required positional accuracy and multiple devices per batch capability. The VEDs so produced include a combination of magnetic and electrostatic lenses for electron beam control.

The present disclosure relates to an observation unit, a traveling wave tube unit, and an observation method. An observation unit includes a housing having a vacuum inside, a base housed in the housing and fixed to the housing, and an observation device housed in the housing and supported by the base, wherein the base includes a first magnet, and the observation device includes a second magnet mounted so as to repel the first magnet and supported in a state of being separated from the base.

This invention provides a power transmission window for a traveling wave tube and its fabrication method, belonging to the field of electronic vacuum device technology. The power transmission window includes an outer conductor, an inner conductor, and a window ceramic. The outer conductor is configured as a coaxial annular composite structure, including a first annular portion and a second annular portion. The second annular portion is brazed within the first annular portion. The first annular portion is made of a molybdenum-copper alloy, and the second annular portion is made of oxygen-free copper. The inner conductor is formed by brazing a power transmission needle and a power transmission needle sealing body. The inner conductor axially penetrates the outer conductor from the power transmission needle side, and the power transmission needle sealing body is a hollow structure. The window ceramic passes through the power transmission needle sealing body and is brazed perpendicularly to it, with the outer circumference of the window ceramic brazed to the inner side of the second annular portion.

This invention discloses a slow-wave structure and circuit suitable for high-order modes, including a housing, an upper gate extending from the top wall to the bottom wall of the housing, and a lower gate extending from the bottom wall to the top wall of the housing. Multiple upper and lower gates are staggered, defining multiple periodic vacuum cavities. The upper and lower gates have different heights along the height direction of the slow-wave structure. An electron beam channel is formed between the upper and lower gates. This invention can suppress low-order mode competition and back-wave oscillations at low operating voltages, achieving stable operation in high-order modes and achieving high output power of 100W or more with low voltage.

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.

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.

To create a VED having a plurality of two-dimensional layers formed of different materials which are joined together to form at least one vacuum electronic device (VED) at the same time.SOLUTION: A two-dimensional material layer is mechanically processed to include features necessary for device operations to form features of a three-dimension when the two-dimensional material is assembled and is joined and becomes a three-dimensional structure. The two-dimensional layers are joined together using techniques such as brazing, diffusion bonding, assisted diffusion bonding, solid-state bonding, cold welding, and ultrasonic welding. This manufacturing step makes it possible to built in a metal material, a magnetic material, and a ceramic material which are necessary to manufacture a VED while maintaining a required positional accuracy and a large number of devices for a batch capacity. The thus formed VED includes a combination of a magnetic lens and an electrostatic lens for controlling electron beams.SELECTED DRAWING: Figure 1

The present application relates to an electron gun, which has a cathode having an electron emission surface, a planar shape of which is circular, and which emits electrons, a heater which warms the cathode, and an anode which applies a positive potential to the cathode and extracts the electrons in a certain direction. The cathode has a through-hole along a central axis of the cathode in a central portion thereof, and at least one of an opening edge portion of the through-hole on the electron emission surface side and an inner surface of the through-hole has a non-emission layer, or the opening edge portion of the through-hole on the electron emission surface side is a chamfered C face or a chamfered R face.

The invention provides a preparation method of a terahertz traveling wave tube based on an electron beam gasification chambering technology and the terahertz traveling wave tube, and the preparation method comprises the steps: machining an initial electron channel in a high-frequency interaction assembly, and enabling the diameter of the initial electron channel to be smaller than the design diameter of an electron beam; centering and welding the high-frequency interaction assembly and the electronic gun; carrying out vacuumizing operation on the terahertz traveling wave tube through a vacuum exhaust furnace; the electron gun is started, the anode is used for accelerating the electrons for the first time, high voltage is applied to the tube body of the high-frequency interaction assembly for accelerating the electrons for the second time, and the high voltage is larger than the voltage of the anode; wherein the material on the peripheral side of the initial electron channel is gasified and extracted by using the electrons subjected to secondary acceleration.

The present invention provides a waveguide energy transmission structure for a traveling wave tube and a traveling wave tube. The waveguide energy transmission structure includes an energy transmission window; a first output waveguide located on one side of the energy transmission window and connected to the traveling wave tube's slow-wave structure; and a second output waveguide located on the other side of the energy transmission window. The inner wall of the first output waveguide is formed with a stepped waveguide transmission structure arranged along the waveguide's transmission direction. The first output waveguide includes a through hole arranged opposite the stepped waveguide transmission structure. The waveguide energy transmission structure also includes an inner conductor. The inner conductor passes through the through hole and is fixedly coupled to the end face of the stepped waveguide transmission structure adjacent to the through hole. The axis of the inner conductor is perpendicular to the waveguide's transmission direction. This waveguide energy transmission structure can reduce the size of the traveling wave tube.

The present invention discloses a high-frequency helical slow-wave structure and a traveling wave tube, comprising a tube shell and a helical wire fixed in the tube shell by a clamping rod, wherein the helical wire and the tube shell are coaxially arranged; a loading structure is arranged on the inner wall of the tube shell, wherein the loading structure is a groove body formed by a depression of the inner wall of the tube shell, wherein the groove body spirally winds around the central axis of the tube shell on the inner wall of the tube shell to form a helical structure, and extends from one end of the tube shell to the other end of the tube shell. Compared with the existing slow-wave structure, the structure provided by the present invention improves the structure of the slow-wave structure, and by processing the loading structure inside the tube shell, the coupling impedance and output power of the slow-wave structure are improved, and the interaction coupling efficiency of the electron beam and the electromagnetic wave is further improved. In addition, the processing difficulty can be reduced, and a new technical direction is provided for the high-efficiency technology of space traveling wave tubes.