CN101819912A - Slow-wave system structure of dual mode traveling wave tube - Google Patents
Slow-wave system structure of dual mode traveling wave tube Download PDFInfo
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- CN101819912A CN101819912A CN200910251489A CN200910251489A CN101819912A CN 101819912 A CN101819912 A CN 101819912A CN 200910251489 A CN200910251489 A CN 200910251489A CN 200910251489 A CN200910251489 A CN 200910251489A CN 101819912 A CN101819912 A CN 101819912A
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- slow wave
- mode traveling
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Abstract
The invention relates to a slow-wave system structure of a dual mode traveling wave tube, which is characterized in that a slow-wave system is divided into four sections, wherein the first section, the third section and the fourth section are sections of a Huges coupled-cavity slow-wave system; and the second section (speed adjusting tube section) comprises disconnected coupled cavities adjusted under a second mode frequency, namely a Huges coupled-cavity structure and a coupled-cavity slow-wave system structure combined with a speed adjusting tube. In the sense, the tube is mixed and contains attributes of the traveling wave tube and the speed adjusting tube. The slow-wave system structure of the dual mode traveling wave tube can realize that the same input power excites two working modes and realize similar gains of the whole tube when working on the same frequency band in high and low modes.
Description
Technical field
The invention belongs to microwave electron components and parts field, specially refer to the coupling cavity type slow-wave system structure of dual mode traveling wave tube that a kind of Hughes's structure combines with klystron.
Background technology
Along with the raising of aircraft and armament systems performance thereof, its delivery scope of the operation scene in the imagination is increasing.Therefore, require airborne radar not only to have over-the-horizon detection, tracking and missile guidance ability, and require single portion radar to work in many ways.Its function preferably covers all aspects interested.This just requires can to that is to say with the work of multiple PRF pattern as the travelling wave tube of radar transmitter heart, requires travelling wave tube can either be operated in high-peak power, low work than pattern, can be operated in low peak power, high working ratio pattern again.Novel highpowerpulse dual mode traveling wave tube can satisfy these needs.
The slow wave system frequency band broad of coupling cavity structure is easy to realize high-power output.Therefore powerful pulsed TWT slow wave system adopts the coupling cavity structure more.Hughes's type coupled cavity chain just commonly used, to certain concrete system, but the coupling impedance of its negative primary space harmonic wave and gain parameter simple table are shown
K
-1＝f(ω，b)
C＝a(K
1，I
0)
1/3
Wherein: b is that electronics is annotated radius, I
0Be cathode current, a is a coefficient.
Usually, in dual mode traveling wave tube, low mould electronics is annotated radius b
lAlways annotate radius b less than high mould electronics
hAnd the representative value of high and low mould cathode current ratio is 3: 1.Imagination can make b by the utilization of certain technology
l≈ b
h, that is the coupling impedance of high and low mould is the same substantially, then low mould gain parameter C
lCan accomplish: C
l≈ 0.7C
hBut since the restriction of technical difficulty, actual obtainable C
lHas only 0.5C
hOr it is bigger.
In dual mode traveling wave tube, C
lWith C
hThis difference in essence bring a very serious problem.That is: if the low mould of orientation gains and bandwidth, then high mould gain will bring hidden danger to the steady operation of travelling wave tube; If the high module feature of orientation, then low mould gain will cause the deficiency of bandwidth.Above-mentioned C
lWith C
hGap be inevitable outcome when high and low pattern works in identical frequency band.If radar is not abandoned high and low pattern with working method frequently, then this problem can not fundamentally be solved.For this reason, the radar dual-mode transmitter of some new development has adopted the working method that a kind of high and low pattern operating frequency staggers.
But the demand of complete machine is impelled the development of device, is C since cause the main cause with frequency band dual mode traveling wave tube gain inequality distance
lWith C
hDifference, so the solution of problem also is at first to overcome C
lWith C
hDifference.
Summary of the invention
The present invention proposes a kind of novel slow-wave system structure of dual mode traveling wave tube that is used for microwave electronic device, realize two kinds of mode of operations of same input power excitation, and realize the close gain of homogeneous tube when high and low pattern works in identical frequency band.Described technical scheme is as follows:
A kind of dual mode traveling wave tube slow wave device is characterized in that, described dual mode traveling wave tube slow wave device comprises a plurality of common coupled-cavity TWTs and one section klystron.
Preferably,, described slow wave device is divided into four sections, and first section, the 3rd section and the 4th section is Hughes's coupling cavity slow wave system; Second section is that the velocity modulation pipeline section is included in the disjunct coupling cavity of adjusting under second kind of mode frequency, the coupling cavity slow wave system structure that Hughes's type coupling cavity structure combines with klystron.
Preferably,, iron and copper part are alternately placed, and these parts form the coupling cavity wall, and the copper part forms the wall of coupling cavity, and carries out the transition to cylindrical part, and this cylindrical part has been set the distance between the iron disk on the direction of principal axis.
Preferably, second section, promptly the velocity modulation pipeline section is made up of the disjunct coupling cavity of two annulars, is processed with screw hole above being used to constitute the iron disk sidewall of this section.
Preferably, the size of the pad by selecting to be fixed on iron disk part central boss outside is tentatively regulated under low frequency, makes its resonance frequency roughly in desired scope.
Preferably, soldering re-uses screw and finally regulates after finishing one section complete velocity modulation pipeline section, makes the resonance frequency in two chambeies reach desired value respectively.
Preferably, described set screw utilizes laser welding to fix.
Preferably, described slow wave device forms an integral body by soldering processes with velocity modulation pipeline section and the welding of each section of coupling cavity slow wave system.
Preferably, be coated with the coating of guaranteed quality factor on the coupling cavity inner cylindrical surface.
The invention has the beneficial effects as follows, compare with the chamber slow wave structure of closing commonly used, the velocity modulation pipeline section of introducing replenishes modulation once more to electron beam under second pattern, the gain and first pattern that improve under second pattern are close, make dual mode traveling wave tube when work, can realize equal excitation, can make the bandwidth of two patterns when working reach the practicability requirement again with frequency.
Description of drawings
Fig. 1 is the whole system of the coupling cavity slow wave system structural representation that Hughes's type coupling cavity structure of the present invention combines with klystron; Wherein, 1-1,1-3,1-4 section are each section of coupling cavity slow wave, and 1-2 is the velocity modulation pipeline section;
Fig. 2 is the partial structurtes schematic diagram of velocity modulation pipeline section of the present invention; Wherein, 2-1 is a pad, and 2-2 is a set screw;
Fig. 3 is the iron disc structure schematic diagram that is used for the velocity modulation pipeline section of the present invention.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Dual mode traveling wave tube slow wave system of the present invention is characterised in that slow wave system is divided into four sections, and first section, the 3rd section and the 4th section is each section of Hughes's coupling cavity slow wave system; Second section (velocity modulation pipeline section) is included in the disjunct coupling cavity of adjusting under second kind of mode frequency.It is the coupling cavity slow wave system structure that Hughes's type coupling cavity structure combines with klystron.This pipe mixes in this sense, comprises the attribute of travelling wave tube and klystron.
Slow wave system is designed to iron and the copper part is alternately placed, and these parts form the coupling cavity wall.Iron disk also can play the effect of periodic magnetic focusing system pole shoe simultaneously.The copper part forms the wall of coupling cavity, and carries out the transition to cylindrical part, and this cylindrical part has been set the distance between the iron disk on the direction of principal axis, thereby has just formed the cycle of slow wave system.
Second section (velocity modulation pipeline section) is made up of the disjunct coupling cavity of two annulars, is processed with screw hole above being used to constitute the iron disk sidewall of this section.The size of the pad by selecting to be fixed on iron disk part central boss outside is tentatively regulated under low frequency, makes its resonance frequency roughly in desired scope.After finishing one section complete velocity modulation pipeline section by the high temperature brazing technology of vacuum device, re-use screw and finally regulate, make the resonance frequency in two chambeies reach desired value respectively.Simultaneously, come the guaranteed quality factor by the certain coating of coating on coupling cavity inner cylindrical surface.
Equally, utilize the high temperature brazing technology of vacuum device to finish other three sections Hughes's coupling cavity slow wave system sections of dual mode traveling wave tube respectively, utilize identical soldering processes four segmentation butt joint solderings of having welded, constitute the dual mode traveling wave tube slow wave system then, just finish one section complete dual mode traveling wave tube slow wave system.
The slow wave system working method of this structure is as follows: under first kind of pattern, as input signal on common travelling wave tube electron beam is regulated.The input section has the terminal matching load.In fact the electron beam of regulating through there not being second section of mutual effect, and encourage the 3rd section, continues pack and signal takes place to amplify on the 3rd section.Signal is increased to specified level on the 4th section, and enters the energy delivery outlet, finishes energy output.
Under second kind of pattern, because electron beam current acutely reduces (being about 1/3 size of electric current under first kind of pattern), the bunching action of the section and other sections is not enough.At this moment, second section (velocity modulation pipeline section) of introducing plays the effect of guide field, and electron beam is replenished modulation.The 3rd section and the 4th section is still carried out work under the travelling wave tube amplification mode.Through having of the additional modulation of the velocity modulation pipeline section of particular resonant frequency to electron beam, the gain under second pattern can bring up to first pattern under gain close.
With reference to accompanying drawing 2, the size of the pad by selecting to be fixed on iron disk part central boss outside is tentatively regulated the velocity modulation pipeline section under low frequency, makes its resonance frequency roughly in desired scope.After finishing one section complete velocity modulation pipeline section by soldering processes, re-use screw and finally regulate, make the resonance frequency in two chambeies reach desired value respectively.Utilize laser welding secured adjusted screw.
With reference to accompanying drawing 3, on the iron disk part of velocity modulation pipeline section, there are three available use screws of screwed hole to carry out adjusting to the klystron resonance frequency.
With reference to accompanying drawing 1, by soldering processes velocity modulation pipeline section and the welding of each section of coupling cavity slow wave system are formed an integral body, obtain our desired slow wave system parts.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (9)
1. a dual mode traveling wave tube slow wave device is characterized in that, described dual mode traveling wave tube slow wave device comprises a plurality of common coupled-cavity TWTs and one section klystron.
2. dual mode traveling wave tube slow wave device as claimed in claim 1 is characterized in that described slow wave device is divided into four sections, and first section, the 3rd section and the 4th section is Hughes's coupling cavity slow wave system; Second section is that the velocity modulation pipeline section is included in the disjunct coupling cavity of adjusting under second kind of mode frequency, the coupling cavity slow wave system structure that Hughes's type coupling cavity structure combines with klystron.
3. as claim 1,2 described dual mode traveling wave tube slow wave devices, it is characterized in that iron and copper part are alternately placed, these parts form the coupling cavity wall, the copper part forms the wall of coupling cavity, and carries out the transition to cylindrical part, and this cylindrical part has been set the distance between the iron disk on the direction of principal axis.
4. as claim 1,2 described dual mode traveling wave tube slow wave devices, it is characterized in that second section, promptly the velocity modulation pipeline section is made up of the disjunct coupling cavity of two annulars, be processed with screw hole above being used to constitute the iron disk sidewall of this section.
5. dual mode traveling wave tube slow wave device as claimed in claim 3 is characterized in that, the size of the pad by selecting to be fixed on iron disk part central boss outside is tentatively regulated under low frequency, makes its resonance frequency roughly in desired scope.
6. dual mode traveling wave tube slow wave device as claimed in claim 3 is characterized in that, soldering re-uses screw and finally regulates after finishing one section complete velocity modulation pipeline section, makes the resonance frequency in two chambeies reach desired value respectively.
7. dual mode traveling wave tube slow wave device as claimed in claim 4 is characterized in that described set screw utilizes laser welding to fix.
8. as the described dual mode traveling wave tube slow wave of claim 1-7 device, it is characterized in that described slow wave device forms an integral body by soldering processes with velocity modulation pipeline section and the welding of each section of coupling cavity slow wave system.
9. as the described dual mode traveling wave tube slow wave of claim 1-8 device, it is characterized in that, be coated with the coating of guaranteed quality factor on the coupling cavity inner cylindrical surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910251489A CN101819912A (en) | 2009-12-22 | 2009-12-22 | Slow-wave system structure of dual mode traveling wave tube |
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982867A (en) * | 2010-09-06 | 2011-03-02 | 安徽华东光电技术研究所 | Method for improving gain flatness of coupling cavity traveling-wave tube |
| CN102254771A (en) * | 2011-03-10 | 2011-11-23 | 安徽华东光电技术研究所 | Coupling cavity multi-beam traveling wave tube slow wave system |
| CN103094025A (en) * | 2013-01-16 | 2013-05-08 | 电子科技大学 | High-power millimeter wave and terahertz source of radiation device |
| CN106597244A (en) * | 2016-11-21 | 2017-04-26 | 电子科技大学 | Equal excitation characteristic automatic test method for travelling wave tube with preamplifier |
-
2009
- 2009-12-22 CN CN200910251489A patent/CN101819912A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982867A (en) * | 2010-09-06 | 2011-03-02 | 安徽华东光电技术研究所 | Method for improving gain flatness of coupling cavity traveling-wave tube |
| CN102254771A (en) * | 2011-03-10 | 2011-11-23 | 安徽华东光电技术研究所 | Coupling cavity multi-beam traveling wave tube slow wave system |
| CN102254771B (en) * | 2011-03-10 | 2013-04-24 | 安徽华东光电技术研究所 | Coupling cavity multi-beam traveling wave tube slow wave system |
| CN103094025A (en) * | 2013-01-16 | 2013-05-08 | 电子科技大学 | High-power millimeter wave and terahertz source of radiation device |
| CN106597244A (en) * | 2016-11-21 | 2017-04-26 | 电子科技大学 | Equal excitation characteristic automatic test method for travelling wave tube with preamplifier |
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Application publication date: 20100901 |