CN206697441U - The slow-wave structure and its high-frequency structure of helix TWT comprising more transitions - Google Patents
The slow-wave structure and its high-frequency structure of helix TWT comprising more transitions Download PDFInfo
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Abstract
The utility model provides a kind of slow-wave structure of the helix TWT comprising more transitions, including：Input (100), has been arranged between input transition, has realized electron bunching, established increasing wave；Output end (200), including：Phase velocity increase section (210), is just being compensated electronic phase angle and is continuing clustering to electronics；Phase velocity transition (220), connection phase velocity increase section (210) reduce section (230) with phase velocity, are provided with least two and divide transition with Different Slope；And phase velocity reduces section (230), energy output is completed；Cut off (300), be arranged between input (100) and output end (200), cut off feedback approach；And attenuator (400), including master fader (410), positioned at the both sides of cut-out (300)；And secondary attenuator (420), it is internal positioned at input (100).The utility model realizes suppression backward wave oscillation, while keeps the good linearity, and also has higher electronic efficiency and power output.
Description
Technical field
The microwave tube field that the utility model belongs in electronic component, it is related to a kind of spiral for including more transitions
The slow-wave structure and its high-frequency structure of line travelling-wave tubes.
Background technology
Millimeter wave helix TWT has high efficiency, high-gain, high-power and wide band feature, satellite communication,
The field such as radar and electronic countermeasure is widely used.Core component of the space travelling wave tube as power amplifier, its is each
Item performance indications need larger lifting, and then adapt to the development of high-resolution radar Detection Techniques and high rate communication technology
Demand.
Two-band Ka wave bands (33GHz~36GHz)/Q ripples are improved when double gradual change helical line slow-wave structures using routine
During the electronic efficiency of section (43.5GHz~46.5GHz) travelling-wave tubes, there is backward wave oscillation in two frequency ranges, have a strong impact on
The stability of travelling-wave tubes work；When travelling-wave tubes works in saturation state, power output is higher, but the linearity now is poor,
Multi-carrier signal can be made to produce intermodulation composition, cause the generation of crosstalk and monkey chatter phenomenon, influence whole communication system
Performance.
Corresponding research is carried out for the problems such as high-power backward wave oscillation existing for travelling-wave tubes and poor linearity, at present should
With it is most be to use dynamic phase velocity gradual change/jump technique, generally speaking, current research is mainly from suppressing high power travelling wave tube
Backward wave oscillation improves the individually progress of the two aspects of the linearity of travelling-wave tubes, and a comprehensive scheme is not same by the two
When combine and improved, the slow-wave structure of the helix TWT designed at present is suitable only for Ka wave bands or Q ripples
The one-segment of section, bandwidth of operation are not wide enough, it is impossible to meet the growth requirement of two-band space travelling wave tube.Therefore there are still as follows
Technical problem is urgently to be resolved hurrily：A kind of high-power two-band millimeter wave helix TWT slow wave structure is proposed, realization suppresses simultaneously
The backward wave oscillation linearity good with holding, and also there is higher electronic efficiency and power output.
Utility model content
(1) technical problems to be solved
The utility model provides a kind of slow-wave structure and its high-frequency structure of the helix TWT comprising more transitions,
At least partly to solve technical problem set forth above.
(2) technical scheme
According to one side of the present utility model, there is provided a kind of slow wave knot of the helix TWT comprising more transitions
Structure, including：Input 100, input transition is arranged between, this part exists by the velocity modulation and density modulation of electronics
Electron bunching is realized in the end of input 100, establishes increasing wave；Output end 200, including：Phase velocity increases section 210, to electronics phase
Position is just being compensated and the clustering electronics to input continues clustering；Phase velocity transition 220, connection phase velocity increase section 210
Section 230 is reduced with phase velocity, at least two is provided with and divides transition with Different Slope；And phase velocity reduces section 230, by electronics
The energy of note gives electromagnetic field, completes energy output；Cut-out 300, is arranged between input 100 and output end 200, and it cuts off
Feedback approach；And attenuator 400, including：Master fader 410, positioned at the both sides of cut-out 300, cut off feedback approach；It is and secondary
Attenuator 420, inside input 100, it absorbs back wave and backward wave power.
In one embodiment of the present utility model, have Different Slope divides transition to meet following condition：Each point
The absolute value of gradual change slope over 10 gradually successively decreases along longitudinal direction.
In one embodiment of the present utility model, the axial length of each point of transition in the phase velocity transition of output end
It is equal.
In one embodiment of the present utility model, input transition is first kind input transition 120, and it is used
Ramp structure, input 100 include three parts：AB sections, BC sections and CD1Section, wherein BC sections are slope, and its pitch is P1,
Meet following relational expression：
P1=1.035P0
Wherein, P0 represents benchmark pitch, and size is equal to the pitch of AB sections；A、B、C、D1Represent the spiral for including more transitions
The node of the slow-wave structure various pieces of line travelling-wave tubes；
Axial length L 1 corresponding to the pitch distribution of each several part of input 100, L2 and L3 are respectively less than the backward wave of input 100
Start oscillation length；The total length of input 100 between 0.4len~0.5len, wherein, len represents the overall length of the slow-wave structure
Degree.
In one embodiment of the present utility model, input transition is the second class input transition 140, and this second
Class input transition includes at least one projection.
In one embodiment of the present utility model, input transition includes a bulge-structure, and the bulge-structure is
Rectangle, including three parts：KL sections, MN sections and OD1Section, its corresponding pitch are respectively：P6, P7, P6, axial length difference
For：L7, L8, L9, meet following relational expression：
P6=1.017P0, P7=1.034P0, L7=0.1len, L8=0.0065len, L9=0.175len
Wherein, K, L, M, N, O represent the node of the slow-wave structure various pieces of the helix TWT comprising more transitions.
In one embodiment of the present utility model, a groove structure is provided with phase velocity increase section 210, the groove part
Including three parts：D2E sections, EF sections and FG sections, D2The pitch of E sections and FG sections is P2, corresponding axial length be respectively L4 and
The pitch of L6, EF section is P3, and corresponding axial length is L5, and it meets following relational expression：
P2=1.05P0, P3=1.05P0, L4=0.12len, L5=0.12len, L6=0.16len
Wherein, D2, E, F, G represent comprising more transitions helix TWT slow-wave structure various pieces node.
In one embodiment of the present utility model, the pitch that phase velocity reduces section 230 is P5, axial length I4, and it is full
The following relational expression of foot：
P5=0.95P0, I4=0.056len.
In one embodiment of the present utility model, 300 axial length is cut off between 1mm~2mm.
According to other side of the present utility model, a kind of high frequency knot of helix TWT slow wave structure is additionally provided
Structure, inside have the slow-wave structure that above-described embodiment is mentioned, in addition to：Helix 500, supporting rod 600, fan-shaped fin 700 with
And shell 800, wherein, as clamped by the side of three supporting rods being evenly distributed 600, its opposite side is fixed on helix 500
On shell 800, the fan-shaped uniform load of fin 700 is spatially spaced with supporting rod 600 and arranged on shell 800.
(3) beneficial effect
It can be seen from the above technical proposal that the utility model includes the slow-wave structure of the helix TWT of more transitions
And its high-frequency structure has the advantages that：
By using the helical line slow-wave structure of more gradual changes, input transition is set in input, effectively inhibits and returns
Ripple oscillatory occurences；At least two points of transitions are set in the phase velocity transition of output end, more gradual change segment structures is formed, is advantageous to change
The Energy distribution of the kind electronics note into before collector, improves its linearity, and passes through the phase velocity increase section in output end
Groove structure is set, higher harmonic components especially second harmonic is effectively inhibited, makes clustering effect more preferable.Therefore this practicality is new
The slow-wave structure and its high-frequency structure for the helix TWT that type includes more transitions can realize suppression backward wave oscillation, improve simultaneously
The purpose of the linearity, and also there is higher electronic efficiency and larger power output.
Brief description of the drawings
Fig. 1 is the slow-wave structure base for the helix TWT for including more transitions according to the utility model one embodiment
In the structural representation of MTSS2015 Software for Design.
Fig. 2 is the slow-wave structure base for the helix TWT for including more transitions according to second embodiment of the utility model
In the structural representation of MTSS2015 Software for Design.
Fig. 3 is the high frequency knot of the slow-wave structure for the helix TWT for including more transitions according to the utility model embodiment
Structure schematic diagram, wherein (a) is front view, (b) is left view.
Fig. 4 A are the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Ka wave band inputs backward wave gain diagram；Fig. 4 B are the spiral that more transitions are included according to the utility model one embodiment
The backward wave gain diagram of the Q-band input of the slow-wave structure of line travelling-wave tubes.
Fig. 5 A are the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Ka wave bands nonlinear phase shift and AM/PM conversion coefficient figures；Fig. 5 B are comprising more according to the utility model one embodiment
The nonlinear phase shift and AM/PM conversion coefficient figures of the Q-band of the slow-wave structure of the helix TWT of transition.
Fig. 6 A are the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Ka wave bands third order intermodulation gain diagram；Fig. 6 B are the helix that more transitions are included according to the utility model one embodiment
The third order intermodulation gain diagram of the Q-band of the slow-wave structure of travelling-wave tubes.
Fig. 7 A are the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Ka wave bands saturation output power, saturation gain and electronic efficiency figure；Fig. 7 B are according to the utility model one embodiment bag
Q-band saturation output power, saturation gain and the electronic efficiency figure of the slow-wave structure of helix TWT containing more transitions.
【Accompanying drawing main element symbol and letter character explanation】
100- inputs；
120- first kind input transitions；
140- the second class input transitions；
200- output ends；
210- phase velocities increase section；220- phase velocity transitions；
230- phase velocities reduce section；
300- is cut off；
400- attenuators；
410- master faders；420- pair attenuators；
500- helixes；600- supporting rods；
700- sector fins；800- shells；
A, B, C, D1, D2, E, F, G, H, I, J, K, L, M, N, O are used for marking the helix TWT comprising more transitions
The node of slow-wave structure various pieces；
L1, L2, L3, L4, L5, L6, L7, L8, L9, G1, I3, I4, len represent the helix TWT for including more transitions
Slow-wave structure in each several part axial length；
Each portion in the slow-wave structure of helix TWT of P0, P1, P2, P3, P4, P5, P6, the P7 expression comprising more transitions
The pitch dimension divided.
Embodiment
The slow-wave structure and its high-frequency structure of helix TWT of the utility model comprising more transitions are by using more
The helical line slow-wave structure of transition, input transition is set in input, backward wave oscillation phenomenon is effectively inhibited, is exporting
The phase velocity transition at end sets at least two points of transitions, forms more gradual change segment structures, is advantageous to improve into before collector
The Energy distribution of electronics note, its linearity is improved, and groove structure is set by increasing section in the phase velocity of output end, effectively
Higher harmonic components especially second harmonic is inhibited, makes clustering effect more preferable, realizes while suppresses backward wave oscillation and holding
The good linearity, and also there is higher electronic efficiency and power output.
For the purpose of this utility model, technical scheme and advantage is more clearly understood, below in conjunction with specific embodiment, and
Referring to the drawings, the utility model is further described.
In first exemplary embodiment of the present utility model, there is provided a kind of helix traveling wave for including more transitions
The slow-wave structure of pipe.Fig. 1 is the slow wave for the helix TWT for including more transitions according to the utility model one embodiment
Structural representation of the structure based on MTSS2015 Software for Design, shown in reference picture 1, the helix TWT comprising more transitions
Slow-wave structure includes：
Input 100, velocity modulation and the density modulation of electronics are produced, be arranged between first kind input transition
120, for suppressing backward wave oscillation, this part is realized by the velocity modulation and density modulation of electronics in the end of input 100
Electron bunching, establish increasing wave；
Output end 200, including：Phase velocity increases section 210, electronic phase angle is just being compensated and the clustering electronics to input
Continue clustering；Phase velocity transition 220, connection phase velocity increase section 210 reduce section 230 with phase velocity, are provided with least two gradually
Become section, the absolute value of each gradual change slope over 10 gradually successively decreases along longitudinal direction, slow space charge wave and helix on enhancing electronics note
The interaction of the electromagnetic wave of propagation, continue clustering electronics, improve the Energy distribution of electronics note and improve electronic efficiency；And phase velocity
Section 230 is reduced, gives the energy that electronics is noted to electromagnetic field, completes energy output；
Cut-out 300, is arranged between input 100 and output end 200, and it cuts off feedback approach；And
Attenuator 400, including master fader 410 and secondary attenuator 420, wherein, master fader 410 is positioned at cut-out 300
Both sides, it cuts off feedback approach；Secondary attenuator 420 is located inside input 100, and it absorbs back wave and backward wave power.
Various pieces in the present embodiment are specifically introduced below.
AD in the corresponding diagram 1 of input 100 in the present embodiment1Section, this section carries out velocity modulation and the density modulation of electronics, real
Existing electron bunching, establishes increasing wave；Transition is set in input 100, and this transition is first kind input in the present embodiment
Transition 120 is held, using ramp structure, BC sections and CD in corresponding diagram 11Section, this transition are being schemed to suppress backward wave oscillation
Input 100 divides for three parts in 1：AB sections, BC sections and CD1Section；
Pitch on the basis of the pitch of AB sections in the present embodiment, P0 being set to, the pitch of the transition of input 100 is set to family 1,
Its value meets：P1=1.035P0；
In order to reach the purpose for suppressing backward wave oscillation, the condition met when designing 100 each several part axial length of input
For：Axial length L 1 corresponding to the pitch distribution of each several part of input 100, L2 and L3 are respectively less than the backward wave starting of oscillation of input 100
Length；And in order to obtain certain gain, to compensate the gain loss of output end 200, AD1Section takes longer helix, its
Axial length is typically in the range of between 0.4len~0.5len, and its axial length of the present embodiment passes through simulation optimization, and value is
0.4375len；
D in the corresponding diagram 2 of output end 200 in the present embodiment2J sections, including phase velocity increase section 210, phase velocity transition 220 and phase
Low section 230 of prompt drop, distinguish the D in corresponding diagram 12G sections, GI sections and IJ sections；Wherein, GI sections are divided into two transitions, right respectively
Answer the GH sections and HI sections in Fig. 1；Phase velocity increase section 210 is provided with a groove structure, EF sections in corresponding diagram 1, by D2G sections are divided into
Three parts：D2E sections, EF sections and FG sections, EF section groove structures are act as：It is especially secondary humorous to suppress higher harmonic components
Ripple；
Wherein, the axial length of phase velocity increase section 210 pitch change and depth determine electronics note and fast space charge wave
Degree of coupling, if D2The pitch of E sections and FG sections is P2, and corresponding axial length is respectively L4 and L6, and the pitch of EF sections is P3, corresponding
Axial length is L5, and the present embodiment takes P2=1.05P0, P3=1.05P0, L4=0.12len, L5=0.12len, L6=
0.16len.In order to reduce phase distortion, during optimization, can suitably increase phase velocity increase section 210 axial length and
Pitch；
In phase velocity transition 220, the interaction of the electromagnetic wave that slow space charge wave and the helix of electronics note are propagated by
Cumulative strong, the clustering degree of electronics note also improves therewith, and the velocity spread of electronics and little, therefore is advantageous to improve electronics note
Energy distribution and improve electronic efficiency；In order to improve the linearity of travelling-wave tubes, at least two are provided with gradually in phase velocity transition
Become section, the present embodiment is equal to 0.5 I3, wherein I3 tables with double grading structure examples, corresponding GH sections and HI sections, its axial length
Show the axial length of GI sections, the absolute value of each gradual change slope over 10 gradually successively decreases along longitudinal direction, by between output end GH sections and HI sections
Flex point H pitch is set to P4, and the present embodiment takes P4=0.99 P0；
In phase velocity reduces section 230, its pitch is set to P5, and axial length is set to I4, P5=0.95P0, I4 in the present embodiment
=0.056 len；
The axial length of cut-out 400 is set to Gl, generally 1mm~2mm, and it act as cutting off feedback approach.
So far, one embodiment of the present utility model includes the slow-wave structure introduction of the helix TWT of more transitions
Finish.
In second exemplary embodiment of the present utility model, there is provided a kind of helix traveling wave for including more transitions
The slow-wave structure of pipe.Fig. 2 is the slow wave for the helix TWT for including more transitions according to second embodiment of the utility model
Structural representation of the structure based on MTSS2015 Software for Design, as shown in Fig. 2 the helix TWT comprising more transitions is slow
Wave structure and the difference of one embodiment are：The transition that input 100 is set is different, and the second class is used in the present embodiment
Input transition 140, using the structure with projection, the projection can be one, or multiple, the present embodiment is with band
There is a raised topology example, such as BD in Fig. 21Shown in MN sections in section, projection corresponding to the transition divides this transition
For KL sections, MN sections and OD1Section, its corresponding pitch are respectively：P6, P7, P6, axial length are respectively：L7, L8, L9, this reality
Apply and P6=1.017 P0 are taken in example, P7=1.034 P0, L70.1 len, L8=0.0065 len, L90.175 len.
So far, the slow-wave structure for the helix TWT that second embodiment of the utility model includes more transitions has been introduced
Finish.
In the 3rd embodiment of the present utility model, there is provided a kind of helix TWT comprising more transitions it is slow
The high-frequency structure of wave structure, Fig. 3 are the slow wave knot for the helix TWT for including more transitions according to the utility model embodiment
The high-frequency structure schematic diagram of structure, wherein (a) is front view, (b) is left view.As shown in figure 3, include the helix of more transitions
The high-frequency structure of the slow-wave structure of travelling-wave tubes includes：
Helix 500, supporting rod 600, fan-shaped fin 700 and shell 800；Wherein, helix 500 is equal by three distributions
Clamped by the side of even supporting rod 600, its opposite side is fixed on shell 800, and fan-shaped fin 700 is uniformly distributed in shell
On 800, spatially it is spaced and arranges with supporting rod 600；
The material of the selection of helix 500 is in the present embodiment：Copper-plated molybdenum composite material, the high frequency of travelling-wave tubes can be reduced
Loss；Supporting rod 600 select material be：Beryllium oxide；Shell 700 select material be：Disperse copper alloy；Fan-shaped fin 800
Act as：Expand the working band of travelling-wave tubes.
Special instruction, above example are exemplary illustration of the present utility model, bag provided by the utility model
The axial length of slow-wave structure each several part and the parameter of pitch of helix TWT containing more transitions are all based on
MTSS2015 softwares are as obtained from emulation optimizes design, it is not limited to the design parameter that above-described embodiment is mentioned,
And transition can be multiple in the phase velocity transition 220 of output end 200, its slope and axial length are according to the slow of travelling-wave tubes
Wave structure carries out simulation optimization design, and it is defeated that the transition in input 100 is also not limited to the first kind that above-described embodiment is enumerated
The ramp structure and the second class input transition 140 for entering to hold transition 120 contain at least one raised structure；On and
The shape that example in embodiment is also not limited to containing at least one raised structure of the second class input transition 140 is stated,
It can also be the other shapes for meeting features described above, such as gradual change and raised combined shaped etc..
The slow-wave structure of the helix TWT comprising more transitions according to the utility model one embodiment,
Simulation calculation is carried out using MTSS2015, its performance map is as shown in Fig. 4 A~7B.
Fig. 4 A are the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Ka wave band inputs backward wave gain diagram；Fig. 4 B are the spiral that more transitions are included according to the utility model one embodiment
The backward wave gain diagram of the Q-band input of the slow-wave structure of line travelling-wave tubes；Fig. 5 A are according to the utility model one embodiment
The nonlinear phase shift and AM/PM conversion coefficient figures of the Ka wave bands of the slow-wave structure of helix TWT comprising more transitions；Figure
5B is the non-of the Q-band of the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Linear phase shift and AM/PM conversion coefficient figures；
Fig. 6 A are the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Ka wave bands third order intermodulation gain diagram；Fig. 6 B are the helix that more transitions are included according to the utility model one embodiment
The third order intermodulation gain diagram of the Q-band of the slow-wave structure of travelling-wave tubes；As shown in Figure 6 A and 6 B, for 35GHz and 35.505GHz
Incoming frequency, its gain is 54.92dB；For 34.495GHz and 35.51GHz incoming frequency, its gain is respectively
34.83GHz and 35.09GHz, is more or less the same substantially, and the curve shown in figure almost overlaps；
Fig. 7 A are the slow-wave structure for the helix TWT for including more transitions according to the utility model one embodiment
Ka wave bands saturation output power, saturation gain and electronic efficiency figure；Fig. 7 B are according to the utility model one embodiment bag
Q-band saturation output power, saturation gain and the electronic efficiency figure of the slow-wave structure of helix TWT containing more transitions.
From Fig. 4 A~7B, Ka wave bands (33GHz~36GHz) and the input of Q-band (43.5GHz~46.5GHz) phase velocity
The backward wave gain at end is respectively -6.68dB and -6.63dB；The AM/PM conversion coefficients of saturation point be respectively 4.14deg/dB and
2.37deg/dB；Third order intermodulation during saturation power rollback 3dB is respectively 19.83dB and 16.86dB, meets in job specification and returns
Ripple vibration is less than 5deg/dB more than -15dB, saturation point AM/PM conversion coefficients and third order intermodulation is more than 10dB requirement.Simultaneously
The power output of Ka wave bands and Q-band is respectively greater than 385W and 173.5W, and electronic efficiency is respectively greater than 19.23% and 10.11%,
Realize high-output power and efficient target.
In summary, the utility model proposes a kind of slow-wave structure of helix TWT comprising more transitions and its
High-frequency structure, by using the helical line slow-wave structure of more gradual changes, input transition is set in input, effectively inhibits and returns
Ripple oscillatory occurences, at least two points of transitions are set in output end phase velocity transition, more gradual change segment structures is formed, is advantageous to improve
Into the Energy distribution of the electronics note before collector, its linearity is improved, and groove knot is set by increasing section in phase velocity
Structure, higher harmonic components especially second harmonic is effectively inhibited, make clustering effect more preferable, realized while suppress backward wave oscillation
The good linearity with holding, and also there is higher electronic efficiency and power output.Generally speaking, the utility model helps
In widening the working band of space travelling wave tube, and the stability and the linearity of work are also improved, there is important engineer applied
Value.
It should be noted that in accompanying drawing or specification description, similar or identical part all uses identical figure number；It is real
Apply the direction term mentioned in example, such as " on ", " under ", "front", "rear", "left", "right" " longitudinal direction " etc., only it is refer to the attached drawing
Direction, not it is used for limiting the scope of protection of the utility model.In addition, above-described embodiment can be examined based on design and reliability
Consider, the collocation that is mixed with each other uses using or with other embodiment mix and match, i.e., the technical characteristic in different embodiments can be certainly
More embodiments are formed by combination.Word "comprising" does not exclude the presence of element or step not listed in the claims.It is located at
Word "a" or "an" before element does not exclude the presence of multiple such elements.The shape and size of each part are not anti-in figure
Actual size and ratio are reflected, and only illustrates the content of the utility model embodiment.
Certainly, above-described embodiment illustrates rather than to the utility model and the utility model is limited, and this
Art personnel can design alternative embodiment without departing from the scope of the appended claims.According to actual need
Will, the slow-wave structure and its high-frequency structure that the utility model includes the helix TWT of more transitions also include other basic
Element and relevant parameter, due to unrelated with innovation of the present utility model, here is omitted.
Particular embodiments described above, the purpose of this utility model, technical scheme and beneficial effect are carried out to enter one
Step describes in detail, should be understood that and the foregoing is only specific embodiment of the utility model, is not limited to this
Utility model, it is all within the spirit and principles of the utility model, any modification, equivalent substitution and improvements done etc., it all should wrap
It is contained within the scope of protection of the utility model.
Claims (10)
1. a kind of slow-wave structure of the helix TWT comprising more transitions, including：
Input (100), has been arranged between input transition, and this part is by the velocity modulation and density modulation of electronics defeated
Electron bunching is realized in the end for entering end (100), establishes increasing wave；
Output end (200), including：
Phase velocity increase section (210), is just being compensated electronic phase angle and the clustering electronics to input continues clustering；
Phase velocity transition (220), connection phase velocity increase section (210) reduce section (230) with phase velocity, and being provided with least two has not
Divide transition with slope；And
Phase velocity reduces section (230), gives the energy that electronics is noted to electromagnetic field, completes energy output；
Cut off (300), be arranged between input (100) and output end (200), it cuts off feedback approach；And
Attenuator (400), including：
Master fader (410), positioned at the both sides of cut-out (300), cut off feedback approach；And
Secondary attenuator (420), internal positioned at input (100), it absorbs back wave and backward wave power.
2. slow-wave structure according to claim 1, wherein, it is described to divide transition to meet following bar with Different Slope
Part：The absolute value of each point of gradual change slope over 10 gradually successively decreases along longitudinal direction.
3. slow-wave structure according to claim 2, wherein, the axial length of each point of transition is equal.
4. slow-wave structure according to claim 1, wherein, the input transition is first kind input transition
(120), it uses ramp structure, and input (100) includes three parts：AB sections, BC sections and CD1Section, wherein BC sections are oblique
Slope, its pitch are P1, meet following relational expression：
P1=1.035P0
Wherein, P0 represents benchmark pitch, and size is equal to the pitch of AB sections；A、B、C、D1Represent the helix row for including more transitions
The node of the slow-wave structure various pieces of wave duct；
Axial length L 1 corresponding to the pitch distribution of input (100) each several part, L2 and L3 are respectively less than the backward wave of input (100)
Start oscillation length；
The total length of input (100) between 0.4len~0.5len, wherein, len represents the total length of the slow-wave structure.
5. slow-wave structure according to claim 1, wherein, the input transition is the second class input transition
(140), the second class input transition includes at least one projection.
6. slow-wave structure according to claim 5, the input transition includes a bulge-structure, the bulge-structure
For rectangle, including three parts：KL sections, MN sections and OD1Section, its corresponding pitch are respectively：P6, P7, P6, axial length point
It is not：L7, L8, L9, meet following relational expression：
P6=1.017P0, P7=1.034P0, L7=0.1len, L8=0.0065len, L9=0.175len
Wherein, K, L, M, N, O represent the node of the slow-wave structure various pieces of the helix TWT comprising more transitions.
7. slow-wave structure according to claim 1, wherein, a groove structure is provided with the phase velocity increase section (210),
The groove part includes three parts：D2E sections, EF sections and FG sections, D2The pitch of E sections and FG sections is P2, corresponding axial length point
Not Wei the pitch of L4 and L6, EF section be P3, corresponding axial length is L5, and it meets following relational expression：
P2=1.05P0, P3=1.05P0, L4=0.12len, L5=0.12len, L6=0.16len
Wherein, D2, E, F, G represent comprising more transitions helix TWT slow-wave structure various pieces node.
8. slow-wave structure according to claim 1, wherein, the pitch that the phase velocity reduces section (230) is P5, axial length
For I4, it meets following relational expression：
P5=0.95P0, I4=0.056len.
9. according to the slow-wave structure described in any one of claim 1 to 8, wherein, the axial length of the cut-out (300) between
Between 1mm~2mm.
10. a kind of high-frequency structure of helix TWT slow wave structure, including：
Slow-wave structure, helix (500), supporting rod (600), fan-shaped fin (700), shell (800), wherein, helix (500)
As clamped by the side of three supporting rods being evenly distributed (600), its opposite side is fixed on shell (800), fan-shaped fin
(700) uniform load is spatially spaced with supporting rod (600) and arranged on shell (800)；
The slow-wave structure is from the slow-wave structure described in any one of claim 1 to 8.
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