CN105513925B - A kind of method for eliminating folded waveguide the first stop-band of slow-wave structure - Google Patents
A kind of method for eliminating folded waveguide the first stop-band of slow-wave structure Download PDFInfo
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- CN105513925B CN105513925B CN201510895584.8A CN201510895584A CN105513925B CN 105513925 B CN105513925 B CN 105513925B CN 201510895584 A CN201510895584 A CN 201510895584A CN 105513925 B CN105513925 B CN 105513925B
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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
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Abstract
The present invention proposes a kind of method for eliminating folded waveguide the first stop-band of slow-wave structure, comprises the following steps：Electron beam channel is arranged on the axis of folded waveguide slow-wave structure；Control the length of electron beam channel and the ratio d of the radius of electron beam channel scope in the monocycle：0.95≤d≤1.13, so that in the folded waveguide slow-wave structure course of work, electromagnetic wave and the electron beam channel direct-coupling in rectangular waveguide, self-oscillation is avoided the occurrence of, while can further expand the bandwidth performance of vacuum electron device.
Description
Technical field
The present invention relates to vacuum electron device technical field, more particularly to a kind of folded waveguide slow-wave structure first that eliminates to stop
The method of band.
Background technology
The development of external high-frequency vacuum electron device shows that folded waveguide has become a kind of slow wave the most frequently used at present
Structure.In folded waveguide slow-wave structure, electromagnetic wave is propagated in rectangular waveguide, and electronics note passes in cylindrical type electron beam channel
It is defeated.Slow-wave structure can typically have stop-band as a kind of periodic structure in dispersion curve.In folded waveguide slow-wave structure,
Waveguide bend and electron beam channel in the presence of mismatch due to can all produce a part of reflection, although these reflection very littles, not
It can ignore, by the superposition of multicycle more point reflections, cause to generate stop-band in the dispersion curve of folded waveguide slow-wave structure, it is special
It is not that the first stop-band is located at the movement of geometry periodic phase and easily produces self-oscillation for the position near 4 π, becomes folded waveguide
Most important technical problem during travelling-wave tubes is developed.Therefore, it is necessary to it is a kind of eliminate folded waveguide the first stop-band of slow-wave structure method,
To solve above-mentioned technical problem present in prior art.
The content of the invention
The present invention provides a kind of method for eliminating folded waveguide the first stop-band of slow-wave structure, avoids the occurrence of self-oscillation, together
When can further expand the bandwidth performance of vacuum electron device.
The technical solution adopted by the present invention is：A kind of method for eliminating folded waveguide the first stop-band of slow-wave structure, it includes
Following steps：Electron beam channel is arranged on the axis of folded waveguide slow-wave structure；Control electron beam channel in the monocycle
Length and the electron beam channel radius ratio d scope：0.95≤d≤1.13, so that folded waveguide slow-wave structure
In the course of work, electromagnetic wave and the electron beam channel direct-coupling in rectangular waveguide.
Preferably, ratio d=(the p-b)/rc, wherein p is the half geometry cycle of folded waveguide slow-wave structure, and b is square
The narrow length of side of shape waveguide, rcFor the radius of the electron beam channel.
Using above-mentioned technical proposal, the present invention at least has following effect：
The method of the elimination stop-band of folded waveguide structure first of the present invention, is noted using the electromagnetic wave in rectangular waveguide and electronics
Passage direct-coupling, the first stop-band characteristic of the dispersion curve of folded waveguide slow-wave structure is controlled, makes high-frequency folded waveguide row
Wave duct avoids the occurrence of self-oscillation, while can further expand the bandwidth performance of device.
Brief description of the drawings
Fig. 1 is the flow chart of elimination folded waveguide slow-wave structure the first stop-band method of the present invention；
Fig. 2 is using folded waveguide slow wave knot made of elimination folded waveguide slow-wave structure the first stop-band method shown in Fig. 1
The diagrammatic cross-section of structure；
Fig. 3 is the dispersion curve of folded waveguide slow-wave structure shown in Fig. 2；
Fig. 4 is axis coupling of folded waveguide slow-wave structure shown in Fig. 2 when geometry periodic phase shifts are 4 π near the first stop-band
Close the schematic diagram of impedance；
Fig. 5 considers the spy after high-frequency loss to obtain folding slow-wave structure shown in Fig. 2 using microwave studio software emulation
Property.
Wherein, 1- rectangular waveguides；2- electron beam channels.
Embodiment
Further to illustrate the present invention to reach the technological means and effect that predetermined purpose is taken, below in conjunction with accompanying drawing
And preferred embodiment, the present invention is described in detail as after.
The method provided by the invention for eliminating folded waveguide the first stop-band of slow-wave structure, avoids folded waveguide travelling-wave tubes from occurring
Self-excited vibration.The method of elimination folded waveguide the first stop-band of slow-wave structure of the present invention and its each step will be described in detail belows
Suddenly.
As shown in figure 1, the method for elimination folded waveguide the first stop-band of slow-wave structure of the present invention, comprises the following steps：Step
Rapid S10：Electron beam channel is arranged on the axis of folded waveguide slow-wave structure.Step S20：Control electronics note in the monocycle
The ratio d of the length of passage and the radius of electron beam channel scope：0.95≤d≤1.13, so that folded waveguide slow-wave structure
In the course of work, electromagnetic wave and electron beam channel direct-coupling in rectangular waveguide.The dispersion curve of folded waveguide slow-wave structure
In stop-band, particularly the first stop-band to be present be to cause folded waveguide travelling-wave tubes self-oscillation occur, can by the method for the present invention
To eliminate above-mentioned first stop-band.
Fig. 2 is illustrated that using folded waveguide slow wave knot made of the first stop-band of folded waveguide slow-wave structure method of the present invention
The diagrammatic cross-section of structure, wherein hatched parts are metal, and no fill part represents vacuum material, by the rectangular waveguide 1 folded
Formed with cylindrical electron beam channel 2, rectangular waveguide 1 is bent along electric field surface, and electron beam channel 2 is located at folded waveguide slow-wave structure
Axis on, the ratio of monocycle electron beam channel length and radius is d=(p-b)/rc, the ratio is limited to 0.95 to 1.13
In the range of.
Preferably, ratio d=(p-b)/rc, wherein p is the half geometry cycle of folded waveguide slow-wave structure, and b is square
The narrow length of side of shape waveguide, rcFor the radius of electron beam channel.
Fig. 3 represents the dispersion curve of folded waveguide slow-wave structure shown in Fig. 2, the tool of folded waveguide slow-wave structure shown in Fig. 2
Following (the unit of body physical dimension：mm)：A=2, b=0.47, p=0.72, h=0.8, rc=0.24, d=0.89.Can from Fig. 3
To find out, under endless, loss-free ideal conditions, the first stop-band in the dispersion curve of the folded waveguide slow-wave structure disappears
Lose.
Fig. 4 represents the axis of first stop-band when geometry periodic phase shifts are near 4 π of folded waveguide slow-wave structure shown in Fig. 2
Coupled impedance, the following (unit of concrete structure size of folded waveguide slow-wave structure shown in Fig. 2：mm)：A=2, b=0.47, p=
0.72, h=0.8, rc=0.24, d=0.89.As reference, C and D represents prior art folded waveguide slow-wave structure in figure
Axis coupled impedance, and C ' and D ' represents the axis coupled impedance of folded waveguide slow-wave structure shown in Fig. 2.It can be obtained by comparing
Go out, under endless, loss-free ideal conditions, the coupled impedance of the first stop-band upper cut off frequency when periodic phase shifts are near 4 π
Reduce a lot, show that now unstable caused root has obtained elimination in a way.
Fig. 5 is illustrated that to be simulated using 3 D electromagnetic software to folded waveguide slow-wave structure shown in Fig. 2, employs frequency
The analysis method in domain improves the precision calculated, in addition to close to actual conditions, under conditions of high-frequency loss is considered, to length
Selective analysis is carried out for the transmission characteristic near the 20p stop-band of folded waveguide slow-wave structure first.As a result show, traditional folding
The electron beam channel draw ratio of waveguide slow-wave structure is 1.75, by S11 parametric results, the electricity of rectangular waveguide 1 near stop-band
Magnetic field is approximate to be presented standing wave state, easily causes self-oscillation.Using folded waveguide slow-wave structure shown in Fig. 2, by controlling electricity
For the ratio of son note passage length and radius in the range of 0.958 to 1.125, the value in Fig. 5 in above range includes d=
0.958, d=1, d=1.042, d=1.083, d=1.125, S11 parameter illustrate that the folded waveguide is slow below -10dB lines
First stop-band of wave structure, which reduces, even to be eliminated.Illustrate that folded waveguide slow-wave structure shown in Fig. 2 can solve the problem that folded waveguide traveling wave
Self-oscillation problem existing for pipe, in addition this method can also be utilized further to expand using folded waveguide slow-wave structure as core
The bandwidth performance of the microwave electron tube of the heart.
By the explanation of embodiment, should can to the present invention for reach technological means that predetermined purpose is taken and
Effect is able to more go deep into and specific understanding, but appended diagram is only to provide reference and purposes of discussion, not for this
Invention is any limitation as.
Claims (2)
- A kind of 1. method for eliminating folded waveguide the first stop-band of slow-wave structure, it is characterised in that comprise the following steps：Electron beam channel is arranged on the axis of folded waveguide slow-wave structure, wherein the folded waveguide slow-wave structure is square Shape waveguide forms along electric field surface according to periodic structure bending；Control the length of electron beam channel and the ratio d of the radius of electron beam channel scope in the monocycle：0.95≤d≤ 1.13, so that in the folded waveguide slow-wave structure course of work, electromagnetic wave and the direct coupling of the electron beam channel in rectangular waveguide Close.
- 2. the method according to claim 1 for eliminating folded waveguide the first stop-band of slow-wave structure, it is characterised in that the ratio Value d=(p-b)/rc, wherein p be folded waveguide slow-wave structure half geometry cycle, b be rectangular waveguide the narrow length of side, rcTo be described The radius of electron beam channel.
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| CN201510895584.8A CN105513925B (en) | 2015-12-08 | 2015-12-08 | A kind of method for eliminating folded waveguide the first stop-band of slow-wave structure |
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| CN201510895584.8A CN105513925B (en) | 2015-12-08 | 2015-12-08 | A kind of method for eliminating folded waveguide the first stop-band of slow-wave structure |
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| CN105513925B true CN105513925B (en) | 2017-11-14 |
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| 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 |
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| US3684913A (en) * | 1970-09-03 | 1972-08-15 | Varian Associates | Coupled cavity slow wave circuit for microwave tubes |
| CN203607364U (en) * | 2013-12-05 | 2014-05-21 | 电子科技大学 | Slow wave line of trapezoidal line structure |
| CN103854939B (en) * | 2014-01-10 | 2016-05-25 | 中国电子科技集团公司第十二研究所 | A kind of arc-shaped bend floding at boundary waveguide slow-wave structure |
| CN104183444B (en) * | 2014-07-07 | 2019-06-14 | 中国电子科技集团公司第十二研究所 | It is a kind of to successively decrease the folded waveguide slow-wave structure of electron beam channel with internal diameter |
| CN104576266B (en) * | 2014-12-29 | 2018-04-10 | 中国电子科技集团公司第十二研究所 | A kind of unilateral folded waveguide slow-wave structure for backward wave oscillator |
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