CN105679626A - Helical line slow-wave structure with asymmetrical metal loaded blocks - Google Patents
Helical line slow-wave structure with asymmetrical metal loaded blocks Download PDFInfo
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- CN105679626A CN105679626A CN201511020383.XA CN201511020383A CN105679626A CN 105679626 A CN105679626 A CN 105679626A CN 201511020383 A CN201511020383 A CN 201511020383A CN 105679626 A CN105679626 A CN 105679626A
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- wave structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/24—Slow-wave structures, e.g. delay systems
- H01J23/26—Helical slow-wave structures; Adjustment therefor
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Abstract
The invention relates to a helical line slow-wave structure with asymmetrical metal loaded blocks. The slow-wave structure comprises a tube shell, a helical line and a clamping rod positioned between the helical line and the tube shell, wherein the slow-wave structure further comprises at least one metal loaded block with asymmetrical angular directions; and the metal loaded blocks are positioned on the inner wall of the tube shell and are not in contact with the helical line. According to the helical line slow-wave structure provided by the invention, the metal load blocks with asymmetrical angular directions are arranged in the helical line slow-wave structure of any clamping structures, an electromagnetic wave transmission forbidden band is formed; therefore, interaction of electron beams and backward waves is avoided, so that the backward wave oscillation is restrained; and the helical line slow-wave structure can be manufactured conveniently under a normal line-cutting tube shell manufacturing process condition.
Description
Technical field
The invention belongs to microwave vacuum field of electronic devices, it is specifically related to a kind of angle to asymmetric Metal loading helical line slow-wave structure.
Background technology
Helical line slow-wave structure be widely used in needing broadband operation satellite communications, electronics antagonism and radar travelling-wave tubes in. Fig. 1 show conventional helical line slow-wave structure, is the core of broad-band TWT. Fig. 2 is the sectional view of helical line slow-wave structure shown in Fig. 1, and this structure comprises shell, and the spiral-line that coaxially arranges of shell and symmetrically arranged three clamping bars between spiral-line and shell. Clamping bar can have different shape, can also be the various shapes such as rectangle, circle and isosceles triangle except the wedge shape shown in figure. R in Fig. 2aFor spiral inside radius, rbFor spiral outside radius, rcFor shell inside radius, α is the subtended angle of clamping bar. Fig. 3 gives the Brillouin figure (helical line slow-wave structure and below obtains by microwave studio (MWS) simulation of CST company) and the electronics speed line synchronous with base ripple that describe the dispersion property of slow-wave structure shown in Fig. 1 herein, can see electronics except with base ripple synchronously except, also must can meet at A point with the space harmonic wave as backward wave, and and this frequency synchronous. The feedback formed due to backward wave meets phase condition automatically, as long as therefore the electronics note electric current of travelling-wave tubes arrives greatly the amplitude conditions that can meet starting of oscillation, will starting of oscillation and destroy the normal amplification work of travelling-wave tubes. This kind of slow-wave structure limits the power raising of travelling-wave tubes.
In order to suppress the backward wave of spiral-line travelling-wave tubes to vibrate, domestic and international scientists and engineers has carried out a large amount of work. Main technological line is that spiral-line is divided into multistage, and every section note synchronous backward wave frequency from electronics all different to destroy starting of oscillation condition. Publication number is that CN101728183A name is called that the Chinese patent application of " a kind of slow-wave structure for X-band space travelling wave tube " discloses a kind of like this slow-wave structure. The feature of this kind of slow-wave structure is, exports section spiral line and has different multiple sections of pitch, such as, and the beginning section of it comprises length successively to be 43mm, pitch be 0.57mm; Length is 2.12mm, pitch is the transition section of 0.53mm; And length be 10.58mm, pitch is the ending segment of 0.49mm, as shown in Figure 4.This kind of slow-wave structure can suppress backward wave to vibrate under certain condition, but technique relative complex and can not thoroughly solve backward wave synchronous frequency Problems existing.
The travelling-wave tube slow-wave structure of backward wave vibration can not be there is it is thus desirable to provide a kind of.
Summary of the invention
It is an object of the present invention to provide a kind of helical line slow-wave structure to solve in existing travelling-wave tube slow-wave structure the backward wave oscillation problem existed.
According to an aspect of the present invention, a kind of helical line slow-wave structure is provided, comprises shell, spiral-line and the clamping bar between spiral-line and shell, wherein, this helical line slow-wave structure comprises the angle being positioned on inner wall of tube shell further and arranges at least one Metal loading to asymmetric.
Preferably, at least one Metal loading described is separately positioned in one or more inner wall of tube shell part being positioned between clamping bar.
Preferably, at least one is positioned in the inner wall of tube shell part between clamping bar not arrange Metal loading.
Preferably, at least one Metal loading be arranged on one be positioned at clamping bar between inner wall of tube shell part on.
Preferably, described each Metal loading and described shell are integrally formed, or are formed on inner wall of tube shell by welding.
Preferably, described each Metal loading has identical or different cross-section structures.
Preferably, the section shape of described Metal loading is rectangle, circle, wedge shape, spill or convex.
Preferably, described Metal loading is designed to the subtended angle of the distance between spiral-line and Metal loading make electronics speed line not crossing with backward wave part in the dispersion curve of this helical line slow-wave structure.
Preferably, minor increment between the outside surface of described spiral-line and the inner face of Metal loading is between 0.02mm and the 35% of spiral-line outside radius.
According to a further aspect in the invention, it is provided that a kind of travelling-wave tubes comprising helical line slow-wave structure described above.
Helical line slow-wave structure according to the present invention, by arranging angle in the helical line slow-wave structure of any clamp structure to asymmetric Metal loading, defines the forbidden band of electromagnetic transmission, avoids electronics note and backward wave mutual effect, thus suppresses backward wave to vibrate. The slow-wave structure of the present invention conveniently can manufacture under conventional Linear cut shell fabrication process condition.
Adopt the slow-wave structure according to the present invention, overcome the defect that existing slow-wave structure exists backward wave vibration, it is to increase the job stability of slow-wave structure. Adopt and can note current work by electronics greatly according to the travelling-wave tubes of slow-wave structure of the present invention, it is to increase the power of travelling-wave tubes, significantly improve its amplification performance.
Adopt the slow-wave structure according to the present invention, by Metal loading block and shell being integrally formed, when not increasing processing step, the slow-wave structure eliminating backward wave vibration can be obtained. Compared with the slow-wave structure eliminating backward wave vibration in prior art by changing spiral-line pitch, the slow-wave structure of the present invention is simple for assembly process, the stability of process consistency and slow-wave structure can be significantly improved, also can significantly improve the stability adopting the travelling-wave tubes according to slow-wave structure of the present invention.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the schematic perspective view of existing helical line slow-wave structure;
Fig. 2 is the sectional view of helical line slow-wave structure shown in Fig. 1;
Fig. 3 is the dispersion property of helical line slow-wave structure shown in Fig. 1;
Fig. 4 is the schematic diagram of the pitch of existing slow-wave structure change;
Fig. 5 is the sectional view of helical line slow-wave structure according to a first embodiment of the present invention;
Fig. 6 is the dispersion property of slow-wave structure shown in Fig. 5;
Fig. 7 A-7C is the sectional view of the helical line slow-wave structure of distortion according to a first embodiment of the present invention;
The sectional view of Fig. 8 A-8B helical line slow-wave structure according to a second embodiment of the present invention;
The sectional view of the helical line slow-wave structure of Fig. 9 A-9B distortion according to a third embodiment of the present invention;
Figure 10 is dispersion property and the electronics speed line of the slow-wave structure of present example;
Figure 11 be the slow-wave structure of present example and the reference examples phase light velocity than with the comparing of frequency relation;
Figure 12 is the slow-wave structure of present example and reference examples mutual impedance and the comparing of frequency relation.
Embodiment
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further. Parts similar in accompanying drawing represent with identical Reference numeral. It will be understood and appreciated by those or skill in the art that specifically described content is explanation property but not restrictive below, it should not limit the scope of the invention with this.
Owing to angle is to the introducing of asymmetric Metal loading, the width of the Distance geometry loading blocks of Metal loading block and spiral-line is regulated can effectively to change the width in forbidden band thus affect the effect suppressing backward wave vibration. This distance should can ensure not occur under any machinery or thermal stresses between the minor increment of the mechanical contact of Metal loading block and spiral-line to 35% spiral-line outside radius.
Fig. 5 shows the sectional view of a kind of angle according to a first embodiment of the present invention to asymmetric Metal loading helical line slow-wave structure. This helical line slow-wave structure comprises shell 1, clamping bar 2, spiral-line 3 and the Metal loading block 4 being positioned between clamping bar on inner wall of tube shell. In this slow-wave structure, raFor spiral-line inside radius, rbFor spiral outside radius, rcFor shell inside radius, α is the subtended angle of clamping bar. Trapezoidal Metal loading block 4 preferably and shell be formed between clamping bar. This trapezoidal loading blocks inner face is the circle concentric with spiral-line, rjFor the inner face radius of Metal loading block, θ is the subtended angle of Metal loading block. As shown in Figure 6, between the shell and spiral-line of slow-wave structure, angle is to the Metal loading block of asymmetric setting, defines forbidden band in helical line slow-wave structure, it is possible to prevent electronics note and backward wave from synchronously thus inhibiting backward wave to vibrate. Regulate the distance d=r between Metal loading block and spiral-linej-rbAnd the subtended angle θ of the Metal loading block width that can effectively change forbidden band makes backward wave part in the dispersion curve of electronics speed line discord helical line slow-wave structure intersect, only crossing with slow-wave structure dispersion curve forward-wave. If the energy gap required is certain, then the subtended angle θ of Metal loading is more big, and the minimum clearance d between the outside surface of spiral-line and the inner face of Metal loading is also more big. The distance between Metal loading block and spiral-line is regulated can effectively to change the width in forbidden band thus affect the effect suppressing backward wave vibration. This distance should in the minor increment that can ensure not occur the mechanical contact of Metal loading block and spiral-line under any machinery or thermal stresses, such as, between 0.02mm to 35% spiral-line outside radius. In order to keep design phase velocity when not loading, pitch and spiral-line inside radius can be done corresponding adjustment by those skilled in the art as required. For simplicity's sake, the present invention is to how adjusting spiral-line pitch and inside radius repeats.Loading blocks according to the present invention can be integrally formed with shell under conventional Linear cut shell fabrication process condition, it is also possible in existing slow-wave structure assembling process, on inner wall of tube shell, welding metal loading blocks is formed. It may be seen that adopt the slow-wave structure according to the present invention, when not increasing processing step, overcome existing slow-wave structure and there is the special defect of backward wave vibration, it is to increase the job stability of slow-wave structure.
According to embodiments of the invention, the shape of Metal loading block can have various shape perhaps. The shape of Metal loading block section such as but not limited to, rectangle, circle, wedge shape, T-shaped, spill or convex. Fig. 7 A-7C is the sectional view of the helical line slow-wave structure of distortion according to a first embodiment of the present invention, and in diagram slow-wave structure, helical line slow-wave structure comprises shell, 3 clamping bars, spiral-line and the Metal loading block being positioned between clamping bar on inner wall of tube shell. This Metal loading is arranged on the inner wall of tube shell between clamping bar, equal apart from sandwich bar. In other words, Metal loading about spiral-line angle to being arranged on inner wall of tube shell asymmetrically. Metal loading shown in Fig. 7 A has the section of similar rectangle, and its inner face distance spiral-line external diameter has minor increment d, and inner face has width L and makes loading not contact clamping bar. Metal loading shown in Fig. 7 B has T-shaped section, and its inner face distance spiral-line external diameter has minor increment d, and inner face has width L. Metal loading shown in Fig. 7 C has T-shaped section, and its fan-shaped inner face has radius rb, it is greater than spiral-line outside radius rj. By regulating inner face width L or the radius r of the distance d between Metal loading block and spiral-line and Metal loading blockbThe width that can effectively change forbidden band with subtended angle θ makes backward wave part in the dispersion curve of electronics speed line discord helical line slow-wave structure intersect, only crossing with slow-wave structure dispersion curve forward-wave. In order to keep design phase velocity when not loading, and technique convenience, pitch and spiral-line inside radius can be done corresponding adjustment by those skilled in the art as required.
According to embodiments of the invention, multiple Metal loading block can be set between clamping bar. Fig. 8 A-8B illustrates the sectional view of helical line slow-wave structure according to a second embodiment of the present invention. In diagram slow-wave structure, helical line slow-wave structure comprises shell, 3 clamping bars, spiral-line and the multiple Metal loading blocks being positioned between clamping bar on inner wall of tube shell. The plurality of Metal loading block is arranged in the space that is formed by clamping bar, and each Metal loading block, is integrally formed to being arranged on inner wall of tube shell asymmetrically with shell about spiral-line angle. Fig. 8 A is arranged between adjacent clamping bar with illustrating two Metal loading block non-equidistances with different size and shape, and the inner face of two Metal loading blocks is all formed with gap with spiral-line outside. Fig. 8 B is arranged between two clamping bars with illustrating the wedge metal loading blocks non-equidistance that five sizes are different, and the inner face of five Metal loading blocks is all formed with gap with spiral-line outside. By regulating the quantity of Metal loading block, and the inner face width of distance between spiral-line and each Metal loading block or subtended angle can eliminate the backward wave vibration of slow-wave structure, it is to increase the job stability of slow-wave structure.
According to embodiments of the invention, Metal loading block can be set between many group clamping bars. Fig. 9 A-9B illustrates the sectional view of helical line slow-wave structure according to a third embodiment of the present invention. In diagram slow-wave structure, helical line slow-wave structure comprises shell, 3 clamping bars, spiral-line and the multiple Metal loading blocks being positioned between clamping bar on inner wall of tube shell.The plurality of Metal loading block is separately positioned in the space that two are formed by clamping bar, and each Metal loading block, is integrally formed to being arranged on inner wall of tube shell asymmetrically with shell about spiral-line angle. Fig. 9 A illustrates that two size shape different metal loading blocks are separately positioned in the space that two are formed by clamping bar, and the inner face of two Metal loading blocks is all formed with gap with spiral-line outside. In Fig. 9 B, the incomplete same Metal loading block of five size shape is arranged in the space that first is formed by clamping bar, is arranged on the 2nd by clamping in space that bar is formed the Metal loading block unequal-interval that three sizes are different. The inner face of each Metal loading block is all formed with gap with spiral-line outside. By regulating the quantity of Metal loading block, and the inner face width of distance between spiral-line and each Metal loading block or subtended angle can eliminate the backward wave vibration of slow-wave structure, it is to increase the job stability of slow-wave structure.
Below to be operated in 20-23GHz superpower spiral-line travelling-wave tubes, concrete illustrate the slow-wave structure according to the present invention and with the comparing of existing slow-wave structure. With reference to Fig. 1, in reference examples slow-wave structure, spiral-line is of a size of ra=0.38mm, rb=0.46mm, rc=1.1mm, clamping bar α=31 °, pitch is 0.71mm, and ribbon width is 0.3mm. With reference to Fig. 5, according to the slow-wave structure of this example, it is loaded with a Metal loading block, this loading blocks end face radius rj=0.46mm, subtended angle θ=71.6 °. Spiral-line after adjustment is of a size of: ra=0.32mm, rb=0.40mm, rc=1.1mm, α=31 °, pitch is 0.716mm, and ribbon width is 0.3mm. Figure 10 gives dispersion property and the electronics speed line of this real case simulation gained. It can be seen that define good forbidden band between Ji Bo and space harmonic wave, electronics speed line does not have and backward wave district intersects. Figure 11 gives the phase light velocity ratio of slow-wave structure and the reference examples slow-wave structure simulating this example of gained and comparing of frequency relation. As can be seen from the figure both are substantially identical, but the phase light velocity ratio of the present embodiment is more smooth. This illustrates compared with existing slow-wave structure, and under can being operated in same spiral-line voltage according to the slow-wave structure of present example, but the present embodiment synchronous frequency scope is wider. Impedance that Figure 12 gives this example slow-wave structure and reference examples slow-wave structure is coupled is compared with frequency relation. It may be seen that difference of them is little.
Although the present invention with comprise single conchoid and three clamping bars slow-wave structure to invention has been concrete explanation, it will be appreciated by those skilled in the art that, above-described embodiment and example are schematic. Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and it is not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot giving exhaustive to all enforcement modes, the apparent change that the technical scheme of every the present invention of belonging to is extended out or variation are still in the row of protection scope of the present invention.
Claims (9)
1. a helical line slow-wave structure, comprises shell, spiral-line and the clamping bar between spiral-line and shell, it is characterised in that,
This helical line slow-wave structure comprises angle at least one Metal loading to asymmetric setting further, and it is positioned on inner wall of tube shell and does not contact with described spiral-line.
2. helical line slow-wave structure as claimed in claim 1, it is characterised in that, at least one Metal loading described is separately positioned in one or more inner wall of tube shell part being positioned between clamping bar.
3. helical line slow-wave structure as claimed in claim 2, it is characterised in that, at least one is positioned in the inner wall of tube shell part between clamping bar not arrange Metal loading.
4. helical line slow-wave structure as claimed in claim 1, it is characterised in that, at least one Metal loading is arranged on one and is positioned in the inner wall of tube shell part between clamping bar.
5. helical line slow-wave structure as claimed in claim 1, it is characterised in that, described Metal loading and described shell are integrally formed, or are formed on inner wall of tube shell by welding.
6. helical line slow-wave structure as claimed in claim 1, it is characterised in that, described each Metal loading has identical or different cross-section structures.
7. helical line slow-wave structure as claimed in claim 1, it is characterised in that, the section shape of described Metal loading is rectangle, circle, wedge shape, T-shaped, spill or convex.
8. helical line slow-wave structure as claimed in claim 1, it is characterised in that, the minor increment between the outside surface of described spiral-line and the inner face of Metal loading is between 0.02mm and the 35% of spiral-line outside radius.
9. a travelling-wave tubes, comprises helical line slow-wave structure as claimed in claim 1.
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| CN201511020383.XA CN105679626B (en) | 2015-12-29 | 2015-12-29 | Asymmetric Metal loading helical line slow-wave structure |
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| CN201511020383.XA CN105679626B (en) | 2015-12-29 | 2015-12-29 | Asymmetric Metal loading helical line slow-wave structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106206218A (en) * | 2016-07-14 | 2016-12-07 | 中国电子科技集团公司第十二研究所 | A kind of angular asymmetric helical line slow-wave structure and the manufacture method of this slow-wave structure |
| CN108428608A (en) * | 2018-04-08 | 2018-08-21 | 电子科技大学 | A kind of angle logarithm complications slow wave line slow-wave structure of vane loaded being angularly clamped |
| CN111243921A (en) * | 2020-02-12 | 2020-06-05 | 电子科技大学 | Metal loading helix slow wave structure |
| CN112837981A (en) * | 2021-01-08 | 2021-05-25 | 南京三乐集团有限公司 | Ka-waveband high-efficiency light-weight space traveling wave tube |
| CN114864360A (en) * | 2022-05-17 | 2022-08-05 | 电子科技大学 | Ultra-wideband helix traveling wave tube and helix slow wave structure thereof |
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| US4947467A (en) * | 1988-03-24 | 1990-08-07 | Manoly Arthur E | Traveling-wave tube slow-wave structure with integral conductively-loaded barrel and method of making same |
| CN1571096A (en) * | 2003-07-21 | 2005-01-26 | 中国科学院电子学研究所 | Combined extrusion method using transition cellpacking to realize helical slow-wave structure |
| CN101533747A (en) * | 2009-04-27 | 2009-09-16 | 安徽华东光电技术研究所 | Method for manufacturing helix line slow-wave system of wide frequency band traveling wave tube |
| CN202076223U (en) * | 2011-05-20 | 2011-12-14 | 安徽华东光电技术研究所 | Loading slow-wave structure of helical line traveling-wave tube |
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2015
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| US4947467A (en) * | 1988-03-24 | 1990-08-07 | Manoly Arthur E | Traveling-wave tube slow-wave structure with integral conductively-loaded barrel and method of making same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106206218A (en) * | 2016-07-14 | 2016-12-07 | 中国电子科技集团公司第十二研究所 | A kind of angular asymmetric helical line slow-wave structure and the manufacture method of this slow-wave structure |
| CN108428608A (en) * | 2018-04-08 | 2018-08-21 | 电子科技大学 | A kind of angle logarithm complications slow wave line slow-wave structure of vane loaded being angularly clamped |
| CN111243921A (en) * | 2020-02-12 | 2020-06-05 | 电子科技大学 | Metal loading helix slow wave structure |
| CN111243921B (en) * | 2020-02-12 | 2021-06-04 | 电子科技大学 | Metal loading helix slow wave structure |
| CN112837981A (en) * | 2021-01-08 | 2021-05-25 | 南京三乐集团有限公司 | Ka-waveband high-efficiency light-weight space traveling wave tube |
| CN112837981B (en) * | 2021-01-08 | 2023-11-14 | 南京三乐集团有限公司 | Ka-band high-efficiency light-weight space traveling wave tube |
| CN114864360A (en) * | 2022-05-17 | 2022-08-05 | 电子科技大学 | Ultra-wideband helix traveling wave tube and helix slow wave structure thereof |
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