CN206697441U - The slow-wave structure and its high-frequency structure of helix TWT comprising more transitions - Google Patents

Abstract

The utility model provides a slow wave structure of a helical traveling wave tube comprising multiple gradual changing sections, comprising: an input end (100), with an input end gradual changing section arranged therebetween to realize electron clustering and build up a growth wave; an output end ( 200), including: a phase velocity increase section (210), which positively compensates the electronic phase and continues to cluster the electrons; a phase velocity gradual change section (220), which connects the phase velocity increase section (210) and the phase velocity decrease section (230 ), is provided with at least two sub-gradient sections with different slopes; and a phase velocity reduction section (230), completes the energy output; cuts off (300), is arranged between the input end (100) and the output end (200), and cuts off a feedback path; and attenuators (400), including a main attenuator (410), located on both sides of the cutoff (300); and a sub attenuator (420), located inside the input (100). The utility model realizes suppressing the return wave oscillation while maintaining good linearity, and also has higher electronic efficiency and output power.

Description

Slow-wave structure and its high-frequency structure of a helical traveling-wave tube with multiple transitions

technical field

The utility model belongs to the field of microwave electron tubes in electronic components, and relates to a slow-wave structure and a high-frequency structure of a helical traveling-wave tube with multiple gradual changes.

Background technique

The millimeter wave helical traveling wave tube has the characteristics of high efficiency, high gain, high power and wide frequency band, and has been widely used in satellite communication, radar and electronic countermeasures and other fields. As the core component of the power amplifier, the space traveling wave tube needs to be greatly improved in its various performance indicators, so as to meet the development needs of high-resolution radar detection technology and high-speed communication technology.

When the conventional dual-tapered helical slow-wave structure is used to improve the electronic efficiency of the dual-band Ka-band (33GHz-36GHz)/Q-band (43.5GHz-46.5GHz) TWT, back wave oscillations appear in both frequency bands , which seriously affects the stability of the TWT; when the TWT works in a saturated state, the output power is high, but the linearity at this time is poor, which will cause intermodulation components in multi-carrier signals, resulting in intermodulation distortion and The occurrence of adjacent channel interference affects the performance of the entire communication system.

Corresponding research has been carried out on the problems of high-power return wave oscillation and poor linearity in traveling wave tubes. At present, the most widely used technology is the dynamic phase velocity gradient/jump technology. Generally speaking, the current research mainly focuses on suppressing large The return wave oscillation of the power traveling wave tube or the improvement of the linearity of the traveling wave tube are carried out separately, and there is no comprehensive plan to combine the two at the same time for improvement. The slow wave structure of the helical traveling wave tube currently designed It is only suitable for single-band Ka-band or Q-band, and the working bandwidth is not wide enough to meet the development needs of dual-band space traveling wave tubes. Therefore, there are still the following technical problems to be solved urgently: to propose a high-power dual-band millimeter-wave helical traveling-wave tube slow-wave structure, which can simultaneously suppress the return wave oscillation and maintain good linearity, and also has high electronic efficiency and output power.

Utility model content

(1) Technical problems to be solved

The utility model provides a slow-wave structure and a high-frequency structure of a helical traveling-wave tube including multiple gradually changing segments, so as to at least partly solve the above-mentioned technical problems.

(2) Technical solution

According to one aspect of the present invention, there is provided a slow-wave structure of a helical traveling wave tube with multiple gradual changes, including: an input end 100, with input end gradual changes, which are electronically modulated by speed and density The modulation realizes electronic clustering at the end of the input terminal 100, and builds up growth waves; the output terminal 200 includes: a phase velocity increase section 210, which positively compensates the electronic phase and continues to cluster the clustered electrons at the input terminal; phase velocity gradual change section 220, connect the phase velocity increasing section 210 and the phase velocity reducing section 230, and be provided with at least two sub-gradient sections with different slopes; and the phase velocity reducing section 230, give the energy of the electron injection to the electromagnetic field to complete the energy output; cut off 300 , is arranged between the input terminal 100 and the output terminal 200, and it cuts off the feedback path; and the attenuator 400 includes: a main attenuator 410, located on both sides of the cutoff 300, and cutting off the feedback path; and a sub-attenuator 420, located at the input end 100 internal, which absorbs reflected waves and returned wave power.

In one embodiment of the present invention, the sub-gradient sections with different slopes satisfy the following condition: the absolute value of the slope of each sub-transition section gradually decreases along the longitudinal direction.

In one embodiment of the present invention, the axial lengths of each sub-gradient segment in the phase velocity gradual change segment at the output end are equal.

In one embodiment of the present invention, the input terminal transition section is the first type of input terminal transition section 120, which adopts a slope structure. The input terminal 100 includes three parts: AB section, BC section and CD ₁ section, wherein BC section is a slope, and its pitch is P1, which satisfies the following relationship:

P1=1.035P0

Among them, P0 represents the reference pitch, which is equal to the pitch of the AB section; A, B, C, and D1 represent the nodes _of each part of the slow wave structure of the helical TWT that includes multiple gradual changes;

The axial lengths L1, L2 and L3 corresponding to the pitch distribution of the various parts of the input end 100 are all smaller than the return wave starting length of the input end 100; the total length of the input end 100 is between 0.4len and 0.5len, where len represents The total length of the slow wave structure.

In one embodiment of the present invention, the input-end gradual change section is a second-type input-end gradual change section 140 , and the second-type input-end gradual change section includes at least one protrusion.

In one embodiment of the present utility model, the gradual change section at the input end includes a raised structure, which is rectangular and includes three parts: KL section, MN section and OD ₁ section, and the corresponding pitches are: P6 , P7, P6, the axial lengths are: L7, L8, L9, satisfying the following relationship:

P6=1.017P0, P7=1.034P0, L7=0.1len, L8=0.0065len, L9=0.175len

Among them, K, L, M, N, O denote the nodes of each part of the slow wave structure of the helical TWT including multi-gradient segments.

In one embodiment of the present utility model, a groove structure is arranged in the phase velocity increasing section 210, and the groove part includes three parts: D ₂ E section, EF section and FG section, D ₂ E section and FG section The pitch is P2, and the corresponding axial lengths are L4 and L6 respectively. The pitch of the EF segment is P3, and the corresponding axial length is L5, which satisfy the following relationship:

P2=1.05P0, P3=1.05P0, L4=0.12len, L5=0.12len, L6=0.16len

Among them, D ₂ , E, F, and G represent the nodes of each part of the slow wave structure of the helical TWT including multi-gradient sections.

In one embodiment of the present invention, the pitch of the phase velocity reduction section 230 is P5, and the axial length is I4, which satisfy the following relational expression:

P5=0.95P0, I4=0.056len.

In one embodiment of the present invention, the axial length of the cut 300 is between 1 mm and 2 mm.

According to another aspect of the present utility model, there is also provided a high-frequency structure of a slow-wave structure of a helical traveling wave tube, which has the slow-wave structure mentioned in the above embodiment inside, and further includes: a helix 500, a clamping rod 600 , the fan-shaped fin 700 and the tube shell 800, wherein the helix 500 is clamped by one side of three uniformly distributed clamping rods 600, and the other side is fixed on the tube shell 800, and the fan-shaped fin 700 is evenly loaded on the tube The housing 800 is spaced apart from the clamping rod 600 .

(3) Beneficial effects

It can be seen from the above technical solution that the slow wave structure and high frequency structure of the helical traveling wave tube with multiple gradual changes in the present invention has the following beneficial effects:

By adopting a multi-gradient helical slow-wave structure and setting an input-end gradual change section at the input end, the return wave oscillation phenomenon is effectively suppressed; at least two sub-gradient sections are set at the output end phase-velocity gradual change section to form a multi-change section structure. It is beneficial to improve the energy distribution of the electron beam entering the front of the collector and improve its linearity, and by setting the groove structure at the phase velocity increase section at the output end, the high-order harmonic components, especially the second harmonic, are effectively suppressed, so that the group Poly effect is better. Therefore, the slow-wave structure and high-frequency structure of the helical traveling-wave tube with multi-gradient sections in this utility model can realize the purpose of suppressing the return wave oscillation and improving the linearity at the same time, and also has higher electronic efficiency and larger output power.

Description of drawings

Fig. 1 is a schematic structural diagram of a slow-wave structure of a helical traveling-wave tube including multiple transition segments designed based on MTSS2015 software according to the first embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a slow wave structure of a helical traveling wave tube including multiple transition segments designed based on MTSS2015 software according to the second embodiment of the present invention.

Fig. 3 is a schematic diagram of a high-frequency structure of a slow-wave structure of a helical traveling-wave tube including multi-gradient segments according to an embodiment of the present invention, wherein (a) is a front view, and (b) is a left view.

Fig. 4A is the return wave gain diagram of the Ka-band input end of the slow-wave structure of the helical traveling wave tube comprising multiple gradual transitions according to the first embodiment of the present invention; Return-wave gain plot at the Q-band input of the slow-wave structure of the helical TWT with the tapered section.

Fig. 5A is the non-linear phase shift and AM/PM conversion coefficient diagram of the Ka band of the slow wave structure of the helical TWT including multi-gradient sections according to the first embodiment of the present invention; Fig. 5B is the graph according to the first embodiment of the present invention One embodiment includes a graph of nonlinear phase shift and AM/PM conversion coefficients for the Q-band of the slow-wave structure of a helical TWT with multiple tapered segments.

Fig. 6A is the third-order intermodulation gain diagram of the Ka band of the slow-wave structure of the helical traveling wave tube including multi-gradient sections according to the first embodiment of the present invention; Fig. 6B is a diagram according to the first embodiment of the present invention including The third-order intermodulation gain diagram of the Q-band of the slow-wave structure of the helical TWT with multiple transitions.

Fig. 7A is a Ka-band saturation output power, saturation gain and electronic efficiency graph of the slow wave structure of the helical TWT including multi-gradient sections according to the first embodiment of the present invention; Fig. 7B is a graph according to the first embodiment of the present invention The embodiment includes graphs of Q-band saturated output power, saturation gain and electron efficiency of the slow-wave structure of the helical TWT with multiple tapered sections.

[Description of main component symbols and letter symbols in the attached drawings]

100-input terminal;

120-the first type of input end gradient segment;

140-the second type of input end gradient segment;

200-output terminal;

210-phase velocity increase section; 220-phase velocity gradual change section;

230-phase velocity reduction section;

300 - cut off;

400 - attenuator;

410-main attenuator; 420-sub-attenuator;

500-helix; 600-clamping rod;

700-sector fin; 800-tube shell;

A, B, C, D1, D2, E, F, G, H, I, J, K, L, M, N, O are used to mark the various parts of the slow wave structure of the helical traveling wave tube with multiple gradients the node;

L1, L2, L3, L4, L5, L6, L7, L8, L9, G1, I3, I4, len represent the axial lengths of each part in the slow wave structure of the helical traveling wave tube with multiple gradient segments;

P0, P1, P2, P3, P4, P5, P6, P7 indicate the pitch size of each part in the slow wave structure of the helical TWT including multiple gradual transition segments.

detailed description

The utility model includes the slow wave structure of the helical traveling wave tube with multi-gradient sections and its high-frequency structure. By adopting the helical slow-wave structure with multi-gradient sections, the input end is provided with a gradual change section at the input end, which effectively suppresses the return wave oscillation phenomenon. , at least two sub-gradient sections are set in the phase velocity gradient section at the output end to form a multi-gradient section structure, which is conducive to improving the energy distribution of the electron beam entering the front of the collector, improving its linearity, and increasing the phase velocity at the output end The section is equipped with a groove structure, which effectively suppresses the high-order harmonic components, especially the second harmonic, so that the grouping effect is better, and the return wave oscillation is suppressed and the linearity is maintained at the same time, and it also has high electronic efficiency. and output power.

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

In the first exemplary embodiment of the present invention, a slow wave structure of a helical traveling wave tube comprising multiple tapering segments is provided. Fig. 1 is a schematic diagram of the structure of the slow wave structure of the helical traveling wave tube including multi-gradient sections according to the first embodiment of the present invention based on MTSS2015 software design. Referring to Fig. 1, the helical traveling wave tube including multi-gradient sections The slow wave structures include:

The input end 100 produces electronic speed modulation and density modulation, and a first-type input end gradual change section 120 is arranged therebetween to suppress the return wave oscillation. This part realizes electronic speed modulation and density modulation at the end of the input end 100 through electronic speed modulation and density modulation Clustering, creating waves of growth;

The output terminal 200 includes: a phase velocity increase section 210, which positively compensates the electronic phase and continues to cluster the clustered electrons at the input terminal; a phase velocity gradual change section 220, which connects the phase velocity increase section 210 and the phase velocity decrease section 230, and sets There are at least two gradient sections, and the absolute value of the slope of each gradient section gradually decreases along the longitudinal direction, which enhances the interaction between the slow space charge wave on the electron beam and the electromagnetic wave propagating in the helix, continues to gather electrons, improves the energy distribution of the electron beam and Improving the electron efficiency; and the phase velocity reduction section 230, which transfers the energy injected by the electrons to the electromagnetic field to complete the energy output;

a cut-off 300, disposed between the input end 100 and the output end 200, which cuts off the feedback path; and

The attenuator 400 includes a main attenuator 410 and a sub-attenuator 420, wherein the main attenuator 410 is located on both sides of the cut-off 300, which cuts off the feedback path; the sub-attenuator 420 is located inside the input terminal 100, which absorbs reflected waves and return waves power.

Each part in this embodiment will be described in detail below.

In this embodiment, the input end 100 corresponds to section AD ₁ in Fig. 1, and this section performs electronic speed modulation and density modulation to realize electronic clustering and build up a growth wave; a gradual change section is set in the input end 100, and in this embodiment, the gradual change The segment is the first type of input end gradual change segment 120, which adopts a slope structure, corresponding to the BC segment and the CD ₁ segment in Fig. 1. This gradual change segment is used to suppress the return wave oscillation, so the input end 100 in Fig. 1 is divided into three parts: AB segment, BC segment and CD ₁ segment;

In the present embodiment, the pitch of the AB section is the reference pitch, which is set to P0, and the pitch of the gradual change section of the input terminal 100 is set to user 1, and its value satisfies: P1=1.035P0;

In order to achieve the purpose of suppressing the return wave oscillation, the conditions to be met when designing the axial length of each part of the input end 100 are: the axial lengths L1, L2 and L3 corresponding to the pitch distribution of each part of the input end 100 are all smaller than the return wave of the input end 100. Wave vibration length; and in order to obtain a certain gain to compensate for the gain loss of the output terminal 200, AD ₁ section takes a longer helical line, and its axial length is generally between 0.4len and 0.5len. In this embodiment, The axial length is optimized by simulation, and the value is 0.4375len;

In the present embodiment, the output terminal 200 corresponds to the D2J section in Fig. ₂ , including the phase velocity increasing section 210, the phase velocity gradually changing section 220 and the phase velocity reducing section 230, respectively corresponding to the _D2G section, GI section and IJ section in Fig. 1 section; wherein, the GI section is divided into two gradient sections, respectively corresponding to the GH section and the HI section in Fig. 1; a groove structure is arranged in the phase velocity increasing section 210, corresponding to the EF section in Fig. 1, and the D ₂ G section is divided into three Two parts: D ₂ E section, EF section and FG section, the function of the groove structure of the EF section is to suppress high-order harmonic components, especially the second harmonic;

Among them, the axial length and depth of the pitch change in the phase velocity increasing section 210 determine the coupling degree of the electron beam and the fast space charge wave. Let the pitch of the _D2E section and the FG section be P2, and the corresponding axial lengths are L4 and L6 respectively, The pitch of the EF segment is P3, and the corresponding axial length is L5. In this embodiment, P2=1.05P0, P3=1.05P0, L4=0.12len, L5=0.12len, L6=0.16len. In order to reduce phase distortion, during the optimization process, the axial length and pitch of the phase velocity increasing section 210 can be appropriately increased;

In the phase velocity gradient section 220, the interaction between the slow space charge wave of the electron beam and the electromagnetic wave propagating in the helix gradually strengthens, and the clustering degree of the electron beam also becomes better, and the velocity of the electron is not scattered, so there is It is beneficial to improve the energy distribution of the electron beam and improve the electron efficiency; in order to improve the linearity of the traveling wave tube, at least two gradual transition sections are provided in the phase velocity transition section. This embodiment uses a double gradual transition structure as an example, corresponding to the GH section and the HI section, Its axial length is equal to 0.5 I3, where I3 represents the axial length of the GI segment, and the absolute value of the slope of each gradient segment gradually decreases along the longitudinal direction, and the pitch of the inflection point H between the GH segment and the HI segment at the output end is set as P4. Embodiment gets P4=0.99 P0;

In the phase velocity reduction section 230, the pitch is set to P5, and the axial length is set to I4, in this embodiment P5=0.95P0, I4=0.056 len;

The axial length of the cutting 400 is set to G1, generally 1 mm to 2 mm, and its function is to cut off the feedback path.

So far, the introduction of the slow wave structure of the helical traveling wave tube including the multi-gradient segments in the first embodiment of the present invention is completed.

In the second exemplary embodiment of the present invention, a slow wave structure of a helical traveling wave tube comprising multiple tapering segments is provided. Fig. 2 is a schematic diagram of the structure of the slow wave structure of the helical traveling wave tube containing multiple gradual changes according to the second embodiment of the present invention based on MTSS2015 software design. As shown in Fig. 2, the helical traveling wave tube containing multiple gradual changes The difference between the slow wave structure of the first embodiment and the first embodiment is that: the input end 100 is provided with a different gradual change section. In this embodiment, the second type of input end gradual change section 140 is adopted, and a structure with a protrusion is adopted. The protrusion can be One, or multiple, this embodiment is an example of a structure with a protrusion, as shown in the MN segment in the BD ₁ segment in Figure 2, the corresponding protrusion of the transition segment divides the transition segment into a KL segment , MN section and OD ₁ section, its corresponding pitch is respectively: P6, P7, P6, and axial length is respectively: L7, L8, L9, take P6=1.017 P0, P7=1.034 P0, L70 in the present embodiment. 1 len, L8=0.0065 len, L90.175 len.

So far, the second embodiment of the present invention includes the slow wave structure of the helical traveling wave tube with multiple gradual changes.

In the third embodiment of the present utility model, a high-frequency structure of a slow-wave structure of a helical traveling wave tube containing multiple gradual transition sections is provided. Schematic diagram of the high-frequency structure of the slow-wave structure of the linear traveling wave tube, where (a) is the main view and (b) is the left view. As shown in Figure 3, the high-frequency structure of the slow-wave structure of the helical traveling-wave tube with multiple gradients includes:

The helix 500, the clamping rod 600, the fan-shaped fin 700 and the tube shell 800; wherein, the helix 500 is clamped by one side of three evenly distributed clamping rods 600, and the other side is fixed on the tube shell 800, The fan-shaped fins 700 are evenly distributed on the tube shell 800 and spaced apart from the clamping rod 600;

In this embodiment, the material selected for the helix 500 is: copper-plated molybdenum composite material, which can reduce the high-frequency loss of the traveling wave tube; the material selected for the clamping rod 600 is: beryllium oxide; the material selected for the shell 700 is: dispersion Copper alloy; the function of the fan-shaped fin 800 is to expand the working frequency band of the traveling wave tube.

In particular, the above embodiments are only exemplary illustrations of the utility model, and the parameters of the axial length and pitch of each part of the slow wave structure of the helical traveling wave tube provided by the utility model are based on MTSS2015 The software is obtained by optimizing the design through simulation, and is not limited to the specific parameters mentioned in the above-mentioned embodiments, and there can be multiple phase velocity gradient sections 220 at the output end 200, and its slope and axial length are determined according to the traveling wave The slow wave structure of the tube is simulated and optimized, and the transition section in the input end 100 is not limited to the slope structure of the first type of input end transition section 120 listed in the above embodiment and the second type of input end transition section 140 contains at least one Protruding structure; and the structure containing at least one protruding structure of the above-mentioned second type of input terminal transition segment 140 is not limited to the shape illustrated in the embodiment, and can also be other shapes that meet the above characteristics, such as gradual change and protruding Composite shapes etc.

According to the slow wave structure of the helical traveling wave tube with multiple gradual changes shown in the first embodiment of the present invention, MTSS2015 is used for simulation calculation, and its performance diagrams are shown in Figures 4A-7B.

Fig. 4A is the return wave gain diagram of the Ka-band input end of the slow-wave structure of the helical traveling wave tube comprising multiple gradual transitions according to the first embodiment of the present invention; The return wave gain diagram of the Q-band input end of the slow-wave structure of the helical traveling-wave tube with gradual changes; FIG. 5A is the Ka of the slow-wave structure of the helical traveling-wave tube with multiple gradual changes according to the first embodiment of the present invention. The non-linear phase shift and AM/PM conversion coefficient figure of wave band; Fig. 5 B is the non-linear phase shift and AM of the slow wave structure of the helical line traveling wave tube that comprises multi-gradient section according to the first embodiment of the utility model /PM conversion coefficient graph;

Fig. 6A is the third-order intermodulation gain diagram of the Ka band of the slow-wave structure of the helical traveling wave tube including multi-gradient sections according to the first embodiment of the present invention; Fig. 6B is a diagram according to the first embodiment of the present invention including The third-order intermodulation gain diagram of the Q-band of the slow-wave structure of the helical traveling wave tube with multiple gradual changes; as shown in Figure 6A and Figure 6B, for the input frequencies of 35GHz and 35.505GHz, the gain is 54.92dB; for For the input frequencies of 34.495GHz and 35.51GHz, the gains are 34.83GHz and 35.09GHz respectively, basically the same, and the curves shown in the figure almost overlap;

Fig. 7A is a Ka-band saturation output power, saturation gain and electronic efficiency graph of the slow wave structure of the helical TWT including multi-gradient sections according to the first embodiment of the present invention; Fig. 7B is a graph according to the first embodiment of the present invention The embodiment includes graphs of Q-band saturated output power, saturation gain and electron efficiency of the slow-wave structure of the helical TWT with multiple tapered segments.

From Figures 4A to 7B, it can be seen that the return wave gains at the Ka-band (33GHz-36GHz) and Q-band (43.5GHz-46.5GHz) phase velocity input terminals are -6.68dB and -6.63dB respectively; the AM/PM conversion coefficients at the saturation points are respectively It is 4.14deg/dB and 2.37deg/dB; the third-order intermodulation when the saturation power backs off by 3dB is 19.83dB and 16.86dB respectively, which meets the return wave oscillation greater than -15dB in the working specification, and the AM/PM conversion coefficient at the saturation point is less than 5deg /dB and third-order intermodulation greater than 10dB requirements. At the same time, the output powers of the Ka-band and Q-band are greater than 385W and 173.5W, respectively, and the electronic efficiency is greater than 19.23% and 10.11%, achieving the goals of high output power and high efficiency.

In summary, the utility model proposes a slow-wave structure of a helical traveling wave tube with multiple gradual changes and its high-frequency structure. By adopting a multi-gradient helical slow-wave structure, a gradual change at the input end is set section, which effectively suppresses the back wave oscillation phenomenon, and at least two sub-gradient sections are set in the phase velocity gradient section at the output end to form a multi-gradient section structure, which is conducive to improving the energy distribution of the electron beam entering the collector and improving its linearity , and by setting the groove structure in the phase velocity increase section, the high-order harmonic components, especially the second harmonic, are effectively suppressed, so that the grouping effect is better, and the return wave oscillation is suppressed at the same time and good linearity is maintained, and It also has high electronic efficiency and output power. In general, the utility model helps to broaden the working frequency band of the space traveling wave tube, and also improves the working stability and linearity, and has important engineering application value.

It should be noted that in the drawings or descriptions, similar or identical parts use the same figure number; the direction terms mentioned in the embodiments, such as "upper", "lower", "front", "rear" , "left", "right", "vertical", etc., are only referring to the directions of the accompanying drawings, and are not used to limit the protection scope of the present utility model. In addition, the above-mentioned embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, technical features in different embodiments can be freely combined to form more embodiments. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The shape and size of each component in the figure do not reflect the real size and proportion, but only illustrate the content of the embodiment of the present utility model.

Rather, the above-mentioned embodiments illustrate rather than limit the invention, and those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. According to actual needs, the utility model includes the slow-wave structure of the helical traveling wave tube with multi-gradient sections and its high-frequency structure, and also includes other basic components and related parameters. Since it has nothing to do with the innovation of the utility model, it is not mentioned here Let me repeat.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. It should be understood that the above descriptions are only specific embodiments of the present utility model and are not intended to limit the present invention. For the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope 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.