87results about How to "High coupling impedance" patented technology

A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide range of output voltages and delivered power.

The invention relates to a circular-waveguide slow-wave structure for angularly loading spiral lines, which belongs to the technical field of vacuum electrons and comprises a circular waveguide, N identical spiral lines and two circular-ring medium sheets, wherein the radius of the circular waveguide is R1, the outer radii of the two circular-ring medium sheets are R1, and the inner radii of the two circular-ring medium sheets are R5; the two circular-ring medium sheets are respectively fixed on the two end surfaces of the circular waveguide, and the N identical spiral lines are all connected between the two circular-ring medium sheets, so that the N identical spiral lines are angularly and uniformly distributed inside the circular waveguide; and the hollow parts of the two circular-ring medium sheets and a space part surrounded by all the spiral lines together form an electron-beam passage. The circular-waveguide slow-wave structure can work at short millimeter-wave and terahertz-wave bands, the coupling impedance can be effectively improved, and a dispersion curve is more flat, so that a traveling-wave tube adopting the novel slow-wave structure has higher gain and interaction efficiency, and the larger output power is obtained; and in addition, the phase velocity can be greatly decreased in the invention, accordingly a lower working voltage can be adopted, and the circular-waveguide slow-wave structure is favorable to the miniaturization of devices.

The invention provides a rectangular-grooved loading winding waveguide slow wave line, relating to a travelling wave tube amplifying device in the technical field of microwave vacuum electronics. A series of arc (or right-angle) bend waveguides and straight waveguides are connected end to end to form a winding waveguide structure; each bend waveguide is inboard provided with an opening along the broadside direction of the waveguides; each opening position is connected with a rectangular groove; the whole winding waveguides and the chambers of the rectangular-grooves are mutually communicated; the central axis symmetric line of the winding waveguide structure, the straight waveguides walls and the rectangular-grooved walls are provided with circular through holes at the points of intersection thereof; then two through holes of all adjacent straight waveguide walls and rectangular-grooved walls are connected by metal tubes with the same aperture size as the aperture size of the circular through holes to form an electron bunch channel. In the invention, the rectangular grooves featuring periodic loading are used for improving field distribution in conventional winding waveguide slow wave line; the slow wave line of the invention, compared with ordinary slow wave line, has higher coupling impedance, higher power gain and output power and smaller volume.

The invention discloses a planar annular microstrip slow-wave structure which belongs to the field of microwave electric vacuum technology. The planar annular microstrip slow-wave structure relates to a traveling-wave tube amplifier device. The planar annular microstrip slow-wave structure comprises a dielectric substrate (2) and metal wires (1) on the surface of the dielectric substrate (2). The planar annular microstrip slow-wave structure is characterized in that each metal wire (1) has a periodical structure which is obtained through successively connecting a plurality of annular units with same shape and same dimension. Each annular unit is obtained through joining two open rings which are in mirror symmetry in a vertical direction. Two adjacent annular units are connected at a joining part between the two open rings through a microstrip line. Compared with an existing microstrip slow-wave structure, the planar annular microstrip is advantageous in that a vacuum device with the planar annular microstrip slow-wave structure can be used in a higher operating frequency band on condition of same dimension because of wider cold bandwidth. The planar annular microstrip slow-wave structure provided by the invention has a wide transverse dimension, thereby effectively reducing a requirement for an electronic gun and a focusing magnetic field. The planar annular microstrip slow-wave structure has a relatively high coupling impedance and can perform interaction with an electron beam in a relatively good manner. Therefore the planar annular microstrip slow-wave structure has relatively high potential and is suitable for miniature planar traveling-wave tubes.

The invention relates to a ridge loading zigzag waveguide slow wave line which belongs to the technical field of microwave vacuum electrons and relates to a traveling wave tube amplification device. The device is formed by connecting a series of arc bending waveguides (or right-angle bending waveguides) and straight waveguides end to end, i.e. bending rectangular waveguides into a U-shaped zigzagline (or a right-angle zigzag line) periodically along the electric field surface, so as to form a zigzag waveguide structure. A metal ridge sheet with a certain thickness is loaded on the inner wallsof the straight waveguides of each zigzag unit, and the waveguide walls and the metal ridge sheets are provided with round through holes along the position of a middle axle symmetric line of a slow wave structure, wherein the round through holes of the straight waveguides of two adjacent zigzag units are connected through a metal pipe with an aperture size the same as the aperture size of the round through hole so as to form an electron bunch passage. The invention can improve the coupling impedance of a zigzag waveguide slow wave system, thereby ensuring that a zigzag waveguide traveling wave tube has higher gain and efficiency.

The invention discloses a rectangular slow wave line used for a traveling wave tube. A rectangular ridge waveguide is used as a rectangular shielding cylinder; on the basis of the rectangular shielding cylinder, n, or n+1, or n-1 metal rectangular rings with square externals and circular internals and two metal flat plates are provided additionally; the centers of the metal rectangular rings are overlapped with the central axis of the rectangular ridge waveguide, and are periodically distributed in an axial direction; the internal circular parts of the metal rectangular rings form an electron beam channel of the traveling wave tube; and the metal rectangular rings and the outer shielding cylinder are connected together by the two metal flat plates which are arranged parallel to the wide edge of the rectangular shielding cylinder between the metal rectangular rings and narrow edge of the rectangular shielding cylinder. Therefore, the all-metal slow wave line is formed; the slow wave line is directly connected with the rectangular shielding cylinder, so that the thermal conductivity is greatly improved; the coupling impendence is higher; the power capacity is increased; a ridge loaded structure is adopted, so that a relatively wide bandwidth is realized; meanwhile, the rectangular slow wave line is simple to process, high in integrality, high in processing precision, simple to assemble and good in the radiating effect; and furthermore, the precision of the slow wave tube can be ensured easily.

The invention discloses a one-side folded waveguide slow wave structure for a backward wave oscillator. Curved waveguides on one side of a folded waveguide are arranged in symmetrical positions along a midline. The one-side folded waveguide slow wave structure particularly structurally comprises a straight waveguide array consisting of a plurality of straight waveguides and a plurality of curved waveguides, wherein every two adjacent straight waveguides are connected via one curved waveguide to form a periodic structure; and an electron beam channel penetrates through the straight waveguide array. According to the one-side folded waveguide slow wave structure, the curved waveguides on one side are transferred to the symmetric positions along the midline, so that fundamental waves of the slow wave structure are forward waves; and the backward wave oscillator can achieve appropriate working voltage and higher coupling impedance simultaneously by using the one-side folded waveguide slow wave structure.

The invention discloses a quasi-coaxial zigzag sheet beam slow-wave structure, which comprises a metal shell, a metal slow-wave line and two dielectric support rods, wherein the metal shell is dividedinto an inner layer and an outer shell, the inner layer adopts a zigzag waveguide structure, an electron beam channel is strip-shaped, the bending between two adjacent ridge sheets of the zigzag waveguide structure is provided with an opening; the metal slow-wave line is obtained by folding a metal line, the folding path is the same as the folding path of the zigzag waveguide structure of the inner layer of the metal shell, and an identical electron beam channel is set; and the two dielectric support rods are respectively fixed between the inner layer and the outer layer at two sides of the metal shell, and the side surfaces of the dielectric support rods are partially exposed from the openings set on the zigzag waveguide structure and performs surface contact with the metal slow-wave line so as to clamp the metal slow-wave line and enable the metal slow-wave line to be suspended in an inner cavity of the metal shell. The quasi-coaxial zigzag sheet beam slow-wave structure can reducethe dispersion characteristics and improve the coupling impedance under the premise of ensuring high bandwidth.

The invention discloses a microstrip line slow-wave structure and belongs to the technical field of microwave vacuum electrons and relates to an O-shaped electron vacuum device. The microstrip line slow-wave structure comprises a microsrip transmission line structure which is formed by a metal microstrip line (1), a medium substrate (2) and a metal base plate (3), wherein the metal microstrip line (1) is of a periodic structure which is formed by a plurality of O-shaped metal microstrip line units, the O-shaped metal microstrip line units are in end-to-end connection, each O-shaped metal microstrip line unit is composed of an ellipse opening ring microstrip line and two microstrip lines, and the two microstrip lines are respectively connected with two ends of an opening of the ellipse opening ring microstrip line respectively. Compared with a traditional N-shaped microstrip line slow-wave structure, the microstrip line slow-wave structure has higher coupling impedance and lower working voltages under the size of the same devices, and comprehensive requirements for the aspects such as output power, the working voltages and weight of a traveling-wave tube can be further met.

The invention discloses a curved ridge-loading rectangular slot waveguide slow wave line, which belongs to the field of microwave vacuum electronic devices. The slow wave line comprises two parallel metal plates, wherein an upper metal plate and a lower metal plate are supported and fixed together through a side wall; the two metal plates are provided with curved slots; the shapes of sections of the curved slots are the same as those of half sections formed after the section of a rectangular single-ridge waveguide or a rectangular double-ridge waveguide is sectioned along the central line of a wide edge of the waveguide; each curved slot is formed by connecting a series of curved slot parts with straight slot parts side by side alternately; and the curved slots of the upper metal plate and the lower metal plate are formed in a mirror symmetry mode relative to a central plane between the upper metal plate and the lower metal plate. The curved ridge-loading rectangular slot waveguide slow wave line provided by the invention has the advantages of curved slot waveguide slow wave lines and ridge waveguides, so that the slow wave line has higher power capacity and a wider operating bandwidth; and the slow wave line has the wider operating bandwidth and higher coupling resistance under the same size compared with the conventional curved slot waveguide slow wave line, so that the increase of the bandwidth of a travelling wave tube and the improvement on gains and efficiency are facilitated.

The invention discloses a zigzag waveguide slow-wave line which comprises a zigzag waveguide and a plurality of metal ridge pieces and metal wing pieces, wherein the zigzag waveguide is formed by connecting a series of arc bending waveguides or right-angled bending waveguides and straight waveguides end to end; and one metal ridge piece in a certain thickness is loaded along the wide side direction of the internal wall of each of the straight waveguides, and one metal wing piece in a certain thickness is loaded along the narrow side direction of the internal wall of each of the straight waveguides. Circular through holes are arranged on the internal wall of the wide side of the straight wave guide and the metal ridge piece along the axial symmetry line of the zigzag waveguide, and the circular through holes of the straight waveguides of the two adjacent zigzag units are connected by a metal tube in the same aperture size of the circular through hole so as to form an electronic stream channel. The test indicates that the zigzag waveguide slow-wave line has a more flat dispersion curve in the same structural size, so that the zigzag waveguide slow-wave line can work in a wider scope of frequency band, with a wider working frequency band, and in addition, the coupled impedance can be increased.

The invention discloses a microstrip period meander line slow-wave structure. A dielectric support rod of a linear structure supports the periodic microstrip meander line, the processing difficulty isreduced greatly, and the design flexibility is increased. A present meandering dielectric support rod cannot be realized without a semiconductor technology and uses a silicon substrate, and the dielectric support rod in the structure of the invention is made of a diamond material, the effective dielectric constant (5.7) of diamond is lower than that (11.5) of silicon, and the coupling impedance of the dielectric support rod of the diamond material is higher compared with that of silicon. In addition, the dielectric support rod of the linear structure directly supports the lower surface of theperiod microstrip meander line instead of embedding the meandering band-shaped dielectric support rod, so that a heat radiation problem in the microstrip period meander line slow-wave structure becomes serious, and the diamond of high thermal conductivity can be used to solve the problem.

The invention provides a slow-wave device adopting a circular arc body V-shaped waving micro-strip curve and belongs to the technical field of microwave vacuum electronic technologies. The slow-wave device comprises a cylindrical wave conductor, a circular arc body insulating medium substrate arranged in the cylindrical wave conductor and the circular arc body V-shaped waving micro-strip curve arranged on the arc-shaped surface of the circular arc body insulating medium substrate. Due to the fact that the slow-wave device adopts the cylindrical wave conductor, and the medium substrate arranged in the cylindrical wave conductor and the circular arc body V-shaped waving micro-strip curve are circular arc bodies, a traditional cylindrical electron beam can be adopted to act with electromagnetic wave in working, the coupling impedance and the output power of the slow-wave device are effectively improved, and the slow-wave device can work under the condition of low working voltage. Therefore, compared with the prior art, the slow-wave device has the advantages of being high in coupling impedance, output power and mutual effect efficiency, low in working voltage and small in volume, facilitating expansion of an application range and improvement of wave duct performance and the like.

The invention provides a slow wave structure applicable to a millimeter-wave terahertz-band multi-electron beam return wave pipe. The slow wave structure can be applicable to a millimeter terahertz band and belongs to the field of a microwave vacuum electronic device. In the structure, two fixedly-connected metal gating teeth form a unit ridge, a plurality of unit ridges are periodically arrangedto form a ridge, and the ridge and a rectangular waveguide structure form the slow wave structure. The structure combines the structural characteristics of a ridge waveguide, the rectangular waveguideand a trapezoid line to form a novel slow wave structure. The structure after the slow wave structure is connected in parallel is similar to a multi-conductor slow wave structure, the advantage liesin that the coupling impedance is easy to adjust; by an appropriate parameter design, relatively large coupling impedance can be achieved; the attenuation speed of the coupling impedance in a direction far away from a grate surface is relatively low, a relatively large-area electron beam can be achieved, higher output power is further achieved, and the horizontal size is free from the limitation of wavelength and can be arbitrarily expanded.

The invention discloses a dual-mode travelling-wave tube slow-wave structure comprising a coupling cavity. Electron beam channels are formed in the center of the inner wall of the coupling cavity. A projection is formed at the center of the inner wall of the coupling cavity, and the electronic beam channels are formed in the projection. The electronic beam channels include a projection center layer, a middle layer and an outer layer sequentially from the center of the projection to the edge of the projection, wherein the number of the electronic beam channels in the projection center layer, the middle layer and the outer layer increases sequentially. The three layers of electronic beam channels in the dual-mode travelling-wave tube slow-wave structure provide a high-power operating mode, the two layers of electronic beam channels in the projection center layer and the middle layer provide a low-power operating mode; the low-mode electronic beams are located in the center of the coupling cavity, the electric field is strong, and coupling impedance is large; a plurality of high-mode electronic beams are located at the edge of the coupling cavity, the electric field is small, and the coupling impedance is small. Therefore, when a travelling-wave tube operates in the high-power mode and the low-power mode, the difference of gain parameters C is small. A dual-mode slow-wave system is highly compatible and applicable to focusing of electronic beams by the same electric field.

The invention discloses an ultra-wideband quasi-open slow-wave structure comprising two identical metal plates and supporting metal walls or mediums on the two sides. The center positions on the broad edges of the lower side of the upper metal plate and the upper side of the lower metal plate are each loaded with a striped metal ridge with periodic ups and downs along the longitudinal direction, wherein the width is Rw, the height is Rh, and the cycle length of the ups and downs is p. Thus, a striped electron beam channel is formed in the space between the striped metal ridges, and the height hb is the difference between the difference b of the metal plates and two times of ridge height Rh. The slow-wave structure has a natural electron beam channel, requires no additional processing, is of low processing difficulty and large coupling impedance, and is very beneficial to oscillation starting of a backward wave oscillator. The slow-wave structure is of low low-end cut-off frequency, and has the characteristics of ultra wideband and small high-frequency transmission reflection.

The invention discloses an ultra wide band high-power terahertz radiation source. The ultra wide band high-power terahertz radiation source comprises a negative electrode, a slow wave structure, an energy output coupler and a terminal adapter, wherein the energy output coupler is a three-port element; band-shaped electron beams generated by the negative electrode enter the energy output coupler from a band-shaped electro injecting port, and then the electron beams are output to the slow wave structure from a connecting port of the slow wave structure to generate a terahertz radiation source signal; after the terahertz radiation source signal is reflected in the terminal adapter, the terahertz radiation source signal passes through the slow wave structure to return to the energy output coupler; and finally the terahertz radiation source signal is output through a terahertz radiation source signal output port. The terahertz radiation source has the following characteristics that the terahertz radiation source has ultra wide tuning operation and watt-magnitude high power; the start-oscillation condition can be well satisfied; the requirement on the current density of the electron beams is relatively low; the terahertz radiation source is stable in output signals and pure in frequency spectrum; and the terahertz radiation source is low in operating voltage, small in size, easy to process and assemble, and the like.

The invention discloses a helix high-frequency structure, which comprises a tube housing and a helix fixedly arranged in the tube housing through a plurality of clamping rods. In the axial direction of the high-frequency structure, the high-frequency structure comprises a loading structure having at least two sections of loading sections in different shapes, wherein at least one section of loadingsection comprises a plurality of metal loadings formed on the inner wall of the tube housing. The high-frequency structure can optimize required different parameters in a focus manner on different loading structures; on one hand, coupling impedance is improved, interaction efficiency is enhanced, and output power of a high-end frequency band is enlarged; and on the other hand, a formed normal dispersion curve enables the low-end frequency not to be entirely in an optimal interaction region, so that second harmonic corresponding to the low frequency end and an electron beam cannot synchronize,and the second harmonic is suppressed.

The invention discloses an ultra-wideband planar dual-beam slow wave structure. The ultra-wideband planar dual-beam slow wave structure comprises a planar metal slow wave wire, a metal shell and two dielectric support rods; the planar metal slow wave wire comprises straight metal lines and curved metal lines alternatively connecting the straight metal lines; extension sections are disposed on twoopposite side surfaces of the inner layer of the metal shell, and an opening is disposed between every two adjacent extension sections; the two dielectric support rods are fixed between the inner andouter layers on both sides of the metal shell; parts of the side surfaces of the dielectric support rods are exposed from the openings between the extension sections, are in surface contact with the curved metal lines of the planar metal slow wave wire, and clamp the planar metal slow wave wire to make the planar metal slow wave wire suspend within the inner cavity of the metal shell; each of theextension sections of each side surface of the inner layer extends into the corresponding opening facing the side surface, of the planar metal slow wave wire. The invention can reduce the dispersion characteristics and improve the coupling impedance under the premise of ensuring a large bandwidth.