CN101728183B - Slow wave structure used for X-waveband space travelling wave tube - Google Patents
Slow wave structure used for X-waveband space travelling wave tube Download PDFInfo
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- CN101728183B CN101728183B CN2009102514333A CN200910251433A CN101728183B CN 101728183 B CN101728183 B CN 101728183B CN 2009102514333 A CN2009102514333 A CN 2009102514333A CN 200910251433 A CN200910251433 A CN 200910251433A CN 101728183 B CN101728183 B CN 101728183B
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Abstract
The invention discloses a slow wave structure used for an X-waveband space travelling wave tube. A tube shell adopts a Monel tube shell with the inner diameter of 1.9 millimeters, a holding rod is made of a wedge-shaped BeO99 material, the slow wave structure adopts a high-pure vacuum smelted molybdenum helix of 0.13mm*0.26mm, the helix at the output section of the slow wave structure has a plurality of sections with different thread pitches, and a two-section carbon film attenuator is selected for inhibiting self-oscillation. The slow wave system has the advantages of large coupling impedance, strong heat dissipation capability, high interactive efficiency and the like, and is suitable for the space travelling wave tube.
Description
Technical field
The invention belongs to microwave electron tube field, specifically a kind of slow wave structure that is used for the X-band space travelling wave tube.
Background technology
Space travelling wave tube is the critical component of payload system such as communication, navigation and number biography of present space flight equipment and spaceborne transponder and synthetic aperture radar (SAR) transmitter, and requirement has higher efficient.In travelling wave tube, high-frequency signal axially transmits along slow wave line, and the kinetic energy of in traveling process, annotating because of electron gain obtains amplifying.Therefore, the interaction efficiency of high-frequency signal and electronics notes is key factors that influence the travelling wave tube gross efficiency.
The design of high efficiency slow wave system is the important step of development space travelling wave tube.Because annotating with high-frequency signal, electronics only under synchronous condition, just can carry out effective interaction; Thereby the electronics notes can be the pairing kinetic energy of part that its speed exceeds than synchronizing speed to the energy that radio-frequency field is surrendered; Make that its electronic efficiency is lower, have only about 20% usually.And travelling wave tube is easy to generate self-oscillation, needs the suitable attenuator of design to suppress.Simultaneously, consider the problem of helix heat radiation and coupling impedance, need the suitable supporting rod of design.
In principle, electronics annotate with the microwave field interaction process in, annotate and surrender energy along with electronics, its speed also decreases, when be reduced to the microwave field phase velocity near the time, the transducing process just progressively stops, pipe output reaches capacity.For making the electronics notes continue to surrender energy to radio-frequency field, improve interaction efficiency, we adopt pitch saltus step technology, reduce the phase velocity of high-frequency signal, and it is synchronous again to make high-frequency signal and electronics notes reach speed.
Summary of the invention
The present invention provides a kind of slow wave structure that is used for the X-band space travelling wave tube, and this slow wave structure is made up of shell, helix, supporting rod and attenuator, and the deferent segment helix that it is characterized in that this slow wave structure has different a plurality of sections of pitch.
According to the slow wave structure that is used for the X-band space travelling wave tube of the present invention; Wherein shell adopts the Monel material of internal diameter R=1.9mm; Helix adopts high-purity vacuum melting molybdenum, is of a size of 0.13mm * 0.26mm, and supporting rod adopts wedge structure; Material selection has the BeO99 of thermal conductive resin, and attenuator adopts the carbon film with a cut-out.
According to the slow wave structure that is used for the X-band space travelling wave tube of the present invention, wherein attenuator is divided into length and is respectively 15mm and 21.5mm two sections, and the drift region that length is 2.3mm is left in the centre.
According to the slow wave structure that is used for the X-band space travelling wave tube of the present invention, wherein the input section spiral line length of slow wave structure is 44mm, and pitch is 0.54mm.The deferent segment helix comprises that successively length is 43mm, and pitch is the beginning section of 0.57mm; Length is 2.12mm, and pitch is the changeover portion of 0.53mm; And length is 10.58mm, and pitch is the ending segment of 0.49mm.
Method for designing of the present invention is carried out according to the following steps:
At first,, confirm γ a=1.1, select the preliminary dimension of internal diameter, helix size and the supporting rod of shell, and calculate input section pitch according to the electric current and voltage index.
Secondly,, confirm magnetic field intensity, utilize the mutual effect of computed in software input section, obtain the length and the pitch of the section of input, make the input section obtain higher gain according to the electric current and voltage index.
Once more,,, utilize the parameter of computed in software deferent segment, make the deferent segment state that reaches capacity, obtain the pitch and the length of deferent segment in conjunction with the small signal gain curve according to the parameter of input section.
At last, the input-output section good in calculating is provided with attenuator, utilizes computed in software, obtains input-output section pitch curve, and the length curve of attenuator makes power output satisfy high efficiency requirement.
The invention has the beneficial effects as follows that the interaction efficiency of calculating is up to 35.78%, thereby the gross efficiency of pipe is improved, in conjunction with depressed collector, the travelling wave tube gross efficiency can reach 50%.
Description of drawings
Fig. 1 is a slow wave assembling sectional view of the present invention;
Fig. 2 is a concentrated attenuator sketch map of the present invention;
Fig. 3 is a helix pitch distribution map of the present invention;
Fig. 4 is the slow wave structure cutaway view.
Embodiment
1), chooses cathode current I according to the technical requirement of pipe
k=60mA, slow wave voltage V
0=3900V calculates the speed of electronics notes, the physical parameters such as power, phase velocity, guide wavelength, speed reducing ratio, axial phase constant and radial phase constant of high-frequency input signal;
2) mean radius and the channel radius of calculating helix; Choose high-purity vacuum melting molybdenum helix, the internal diameter R=1.9mm of 0.13mm * 0.26mm the Monel shell, have the wedge shape BeO99 supporting rod of thermal conductive resin, slow wave assembly structure sectional view is as shown in Figure 1;
3) get λ
p/ L=3.5 obtains L=λ
p/ 3.5=7.03mm confirms that the magnetic field cycle is 7.0mm, wherein
Brillouin's magnetic field intensity:
is because the influence of HF defocusing and anode hole effect weakening; Actual required value is:
through adjustment repeatedly, finally getting uniform magnetic field intensity is 1700Gs.
4) mutual effect of the section of input is calculated; Pitch makes
confirms that input section pitch is 0.54mm in adjustment, and selecting interaction region length is 44mm.Wherein b is asynchronous parameter, and Q is a space charge parameter, and C is the gain parameter.
5) confirm that deferent segment interaction region length is 55.7mm;
6) concentrated attenuator (as shown in Figure 2) is set, the long cut-out of 2.3mm is set between input and the deferent segment, attenuator input segment length is set to 15mm, and deferent segment is set to 21.5mm.Used herein is the carbon film attenuator, and the overall attenuation of attenuator is greater than the saturation gain 50dB of pipe, and therefore 60dB is measured in decay here;
7) unite input section and deferent segment and carry out homogeneous tube mutual effect calculating.The deferent segment helix comprises that successively length is 43mm, and pitch is the beginning section of 0.57mm; Length is 2.12mm, and pitch is the changeover portion of 0.53mm; And length is 10.58mm, and pitch is the ending segment of 0.49mm;
8) according to above result, it is as shown in Figure 3 to confirm that helix pitch distributes, and Fig. 4 is the slow wave structure cutaway view.Input section total length is 59mm, and the deferent segment total length is 77.2mm, and the helix total length is 138.5mm.
Final calculation result is as shown in the table:
| Frequency (GHz) | Power output (W) | Efficient (%) |
| ?f min | ?78 | 33.6 |
| ?f 0 | ?83 | 35.78 |
| ?f max | ?74 | 31.7 |
Wherein, f
Min, f
MaxBe respectively lowest frequency points and highest frequency point in the working band, f
0Be center frequency point.
Claims (2)
1. slow wave structure that is used for the X-band space travelling wave tube, this slow wave structure is made up of shell, helix, supporting rod and attenuator, and the deferent segment helix that it is characterized in that this slow wave structure has different a plurality of sections of pitch; Described attenuator is divided into length and is respectively 15mm and 21.5mm two sections, and the drift region that length is 2.3mm is left in the centre.
2. the slow wave structure that is used for the X-band space travelling wave tube according to claim 1 is characterized in that the input section spiral line length of this slow wave structure is 44mm, and pitch is 0.54mm; The deferent segment helix comprises that successively length is 43mm, and pitch is the beginning section of 0.57mm; Length is 2.12mm, and pitch is the changeover portion of 0.53mm; And length is 10.58mm, and pitch is the ending segment of 0.49mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102514333A CN101728183B (en) | 2009-12-18 | 2009-12-18 | Slow wave structure used for X-waveband space travelling wave tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102514333A CN101728183B (en) | 2009-12-18 | 2009-12-18 | Slow wave structure used for X-waveband space travelling wave tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101728183A CN101728183A (en) | 2010-06-09 |
| CN101728183B true CN101728183B (en) | 2012-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009102514333A Expired - Fee Related CN101728183B (en) | 2009-12-18 | 2009-12-18 | Slow wave structure used for X-waveband space travelling wave tube |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117200A (en) * | 2013-02-02 | 2013-05-22 | 成都国光电气股份有限公司 | Slow-wave structure for traveling wave tubes on C wave bands and X wave bands |
| CN104599924B (en) * | 2014-12-24 | 2017-10-10 | 中国电子科技集团公司第十二研究所 | A kind of multistage interacting system helix TWT |
| CN105304438B (en) * | 2015-11-20 | 2017-06-16 | 电子科技大学 | A kind of broadband helical line travelling-wave tubes second harmonic suppressing method |
| CN112030162B (en) * | 2019-06-04 | 2022-08-23 | 中国电子科技集团公司第十二研究所 | Microwave attenuation material dispersion liquid suitable for plating process, waveguide slow wave structure and preparation method thereof |
| CN111063593B (en) * | 2019-12-23 | 2022-10-14 | 南京三乐集团有限公司 | X-waveband 900W pulse space traveling wave tube |
| CN113690118B (en) * | 2021-07-29 | 2022-07-29 | 电子科技大学 | Novel helix slow wave structure with variable pitch and variable inner diameter |
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2009
- 2009-12-18 CN CN2009102514333A patent/CN101728183B/en not_active Expired - Fee Related
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