CN105513925A - Method for eliminating first stop band of folded waveguide slow-wave structure - Google Patents
Method for eliminating first stop band of folded waveguide slow-wave structure Download PDFInfo
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- CN105513925A CN105513925A CN201510895584.8A CN201510895584A CN105513925A CN 105513925 A CN105513925 A CN 105513925A CN 201510895584 A CN201510895584 A CN 201510895584A CN 105513925 A CN105513925 A CN 105513925A
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- wave structure
- folded waveguide
- electron beam
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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 invention provides a method for eliminating a first stop band of a folded waveguide slow-wave structure. The method comprises the following steps: an electron beam channel is arranged on the central axis of the folded waveguide slow-wave structure; the ratio range d between the length of the electron beam channel and the radius of the electron beam channel in single cycle is controlled within 0.95<=d<=1.13, so that in the working process of the folded waveguide slow-wave structure, the electromagnetic wave of rectangular waveguide is directly coupled with the electron beam channel, self-excited oscillation is avoided, and the bandwidth performance of a vacuum electronic device can be further expanded.
Description
Technical field
The present invention relates to vacuum electron device technical field, particularly relate to a kind of method eliminated folded waveguide slow wave structure first and be only with.
Background technology
The development of external high-frequency vacuum electron device shows, folded waveguide has become a kind of slow wave structure the most frequently used at present.In folded waveguide slow wave structure, electromagnetic wave is propagated in rectangular waveguide, and electron beam transmits in column type electron beam channel.As a kind of periodic structure, generally can there is only band in dispersion curve in slow wave structure.In folded waveguide slow wave structure, waveguide bend and electron beam channel all can produce part reflection owing to existing not mate, although these reflections are very little, but can not ignore, through the superposition of multicycle multiple spot reflection, cause creating in the dispersion curve of folded waveguide slow wave structure only band, particularly first only band is positioned at that geometry periodic phase moves is that position near 4 π easily produces self-oscillation, becomes most important technical problem in the development of folded waveguide travelling wave tube.Therefore, a kind of method eliminated folded waveguide slow wave structure first and be only with is needed, to solve the above-mentioned technical problem existed in prior art.
Summary of the invention
The invention provides a kind of method eliminated folded waveguide slow wave structure first and be only with, avoid occurring self-oscillation, the bandwidth performance of vacuum electron device can be expanded simultaneously further.
The technical solution used in the present invention is: a kind of method eliminated folded waveguide slow wave structure first and be only with, and it comprises the following steps: electron beam channel be arranged on the axis of folded waveguide slow wave structure; Control the scope of the ratio d of the length of electron beam channel and the radius of described electron beam channel in the monocycle: 0.95≤d≤1.13, to make in the folded waveguide slow wave structure course of work, the electromagnetic wave in rectangular waveguide and described electron beam channel direct-coupling.
Preferably, described ratio d=(p-b)/r
c, wherein p is the half geometry cycle of folded waveguide slow wave structure, and b is the narrow length of side of rectangular waveguide, r
cfor the radius of described electron beam channel.
Adopt technique scheme, the present invention at least has following effect:
The method that elimination folded waveguide structure first of the present invention is only with, utilize the electromagnetic wave in rectangular waveguide and electron beam channel direct-coupling, control the dispersion curve of folded waveguide slow wave structure first is only with characteristic, make high-frequency folded waveguide travelling wave tube avoid occurring self-oscillation, the bandwidth performance of device can be expanded simultaneously further.
Accompanying drawing explanation
Fig. 1 is the flow chart that elimination folded waveguide slow wave structure first of the present invention stops band method;
Fig. 2 adopts shown in Fig. 1 to eliminate the generalized section that folded waveguide slow wave structure first stops the folded waveguide slow wave structure that band method is made;
Fig. 3 is the dispersion curve of the slow wave structure of folded waveguide shown in Fig. 2;
Fig. 4 is the schematic diagram of the slow wave structure of folded waveguide shown in Fig. 2 first axis coupling impedance only near band when geometry periodic phase shifts is 4 π;
Fig. 5 obtains folding slow wave structure shown in Fig. 2 for utilizing microwave studio software emulation, considers the characteristic after high-frequency loss.
Wherein, 1-rectangular waveguide; 2-electron beam channel.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, the present invention is described in detail as after.
The method that elimination folded waveguide slow wave structure first provided by the invention is only with, avoids folded waveguide travelling wave tube to occur self-excited vibration.Method and each step thereof that elimination folded waveguide slow wave structure first of the present invention stops band will be described in detail belows.
As shown in Figure 1, the method that elimination folded waveguide slow wave structure first of the present invention is only with, comprises the following steps: step S10: electron beam channel be arranged on the axis of folded waveguide slow wave structure.Step S20: the scope controlling the ratio d of the length of electron beam channel and the radius of electron beam channel in the monocycle: 0.95≤d≤1.13, to make in the folded waveguide slow wave structure course of work, the electromagnetic wave in rectangular waveguide and electron beam channel direct-coupling.There is only band in the dispersion curve of folded waveguide slow wave structure, particularly first to stop band be cause folded waveguide travelling wave tube to occur self-oscillation, can eliminate the above-mentioned first only band by method of the present invention.
Shown in Fig. 2 is the generalized section adopting folded waveguide slow wave structure first of the present invention to stop the folded waveguide slow wave structure that band method is made, wherein hatched parts is metal, vacuum material is represented without filling part, be made up of the rectangular waveguide 1 folded and cylindrical electron beam channel 2, rectangular waveguide 1 bends along electric field surface, electron beam channel 2 is positioned on the axis of folded waveguide slow wave structure, and the ratio of monocycle electron beam channel length and radius is d=(p-b)/r
c, this ratio is limited in the scope of 0.95 to 1.13.
As preferably, ratio d=(p-b)/r
c, wherein p is the half geometry cycle of folded waveguide slow wave structure, and b is the narrow length of side of rectangular waveguide, r
cfor the radius of electron beam channel.
Fig. 3 represents the dispersion curve of the slow wave structure of folded waveguide shown in Fig. 2, the concrete structure size following (unit: mm) of the slow wave structure of folded waveguide shown in Fig. 2: a=2, b=0.47, p=0.72, h=0.8, r
c=0.24, d=0.89.As can be seen from Figure 3, under endless, loss-free ideal conditions, in the dispersion curve of this folded waveguide slow wave structure first is only with disappearance.
Fig. 4 represents the slow wave structure of folded waveguide shown in Fig. 2 first axis coupling impedance be only with when geometry periodic phase shifts is near 4 π, the concrete structure size following (unit: mm) of the slow wave structure of folded waveguide shown in Fig. 2: a=2, b=0.47, p=0.72, h=0.8, r
c=0.24, d=0.89.As a reference, in figure, C and D represents the axis coupling impedance of prior art folded waveguide slow wave structure, and C ' and D ' represents the axis coupling impedance of the slow wave structure of folded waveguide shown in Fig. 2.By relatively drawing, under endless, loss-free ideal conditions, when periodic phase shifts is near 4 π, first is only with the coupling impedance of upper cut off frequency to reduce a lot, shows that now the unstable root produced obtains elimination in a way.
Shown in Fig. 5 is utilize 3 D electromagnetic software to simulate the slow wave structure of folded waveguide shown in Fig. 2, the analytical method that have employed frequency domain improves the precision calculated, in addition in order to close to actual conditions, under the condition considering high-frequency loss, selective analysis is carried out to the transmission characteristic of folded waveguide slow wave structure first only near band that length is 20p.Result shows, and the electron beam channel draw ratio of traditional folded waveguide slow wave structure is 1.75, and by S11 parametric results, near being only with, the electromagnetic field of rectangular waveguide 1 is approximate presents standing wave state, easily causes self-oscillation.Adopt folded waveguide slow wave structure shown in Fig. 2, by controlling the ratio of electron beam channel length and radius in the scope of 0.958 to 1.125, d=0.958 is comprised in the value of above-mentioned scope in Fig. 5, d=1, d=1.042, d=1.083, d=1.125, S11 parameter, all below-10dB line, illustrates that first of this folded waveguide slow wave structure is only with reduction even to eliminate.Folded waveguide slow wave structure shown in key diagram 2 can solve the self-oscillation problem that folded waveguide travelling wave tube exists, and this method in addition can also be utilized to expand further with the bandwidth performance of the folded waveguide slow wave structure microwave electron tube that is core.
By the explanation of embodiment, should to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, but appended diagram be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
Claims (2)
1. eliminate the method that folded waveguide slow wave structure first is only with, it is characterized in that, comprise the following steps:
Electron beam channel is arranged on the axis of folded waveguide slow wave structure;
Control the scope of the ratio d of the length of electron beam channel and the radius of described electron beam channel in the monocycle: 0.95≤d≤1.13, to make in the folded waveguide slow wave structure course of work, the electromagnetic wave in rectangular waveguide and described electron beam channel direct-coupling.
2. elimination folded waveguide slow wave structure first according to claim 1 stops the method for band, it is characterized in that, described ratio d=(p-b)/r
c, wherein p is the half geometry cycle of folded waveguide slow wave structure, and b is the narrow length of side of rectangular waveguide, r
cfor the radius of described electron beam channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN105513925A true CN105513925A (en) | 2016-04-20 |
| CN105513925B CN105513925B (en) | 2017-11-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (5)
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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 |
| CN103854939A (en) * | 2014-01-10 | 2014-06-11 | 中国电子科技集团公司第十二研究所 | Arc-shaped curve boundary folding waveguide slow wave structure |
| CN104183444A (en) * | 2014-07-07 | 2014-12-03 | 中国电子科技集团公司第十二研究所 | Folding waveguide slow-wave structure provided with electron beam channel with progressively decreasing internal diameter dimension |
| CN104576266A (en) * | 2014-12-29 | 2015-04-29 | 中国电子科技集团公司第十二研究所 | One-side folded waveguide slow wave structure for backward wave oscillator |
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2015
- 2015-12-08 CN CN201510895584.8A patent/CN105513925B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103854939A (en) * | 2014-01-10 | 2014-06-11 | 中国电子科技集团公司第十二研究所 | Arc-shaped curve boundary folding waveguide slow wave structure |
| CN104183444A (en) * | 2014-07-07 | 2014-12-03 | 中国电子科技集团公司第十二研究所 | Folding waveguide slow-wave structure provided with electron beam channel with progressively decreasing internal diameter dimension |
| CN104576266A (en) * | 2014-12-29 | 2015-04-29 | 中国电子科技集团公司第十二研究所 | One-side folded waveguide slow wave structure for backward wave oscillator |
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| 蔡军 等: "Ｗ 波段折叠波导行波管振荡抑制", 《强激光与粒子束》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN105513925B (en) | 2017-11-14 |
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