CN203607364U - Slow wave line of trapezoidal line structure - Google Patents
Slow wave line of trapezoidal line structure Download PDFInfo
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- CN203607364U CN203607364U CN201320794045.1U CN201320794045U CN203607364U CN 203607364 U CN203607364 U CN 203607364U CN 201320794045 U CN201320794045 U CN 201320794045U CN 203607364 U CN203607364 U CN 203607364U
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- rectangular
- rectangular metal
- metal plate
- ridge
- slow wave
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Abstract
The utility model discloses a slow wave line with a trapezoidal line structure, which is characterized in that rectangular metal plates are periodically arranged in a rectangular waveguide in a staggered mode, an adjacent part of the upper inner wall and the lower inner wall of the rectangular waveguide is provided with a rectangular slot to act as an electromagnetic wave coupling slot, so that electromagnetic waves can pass through, a rectangular metal ridge is additionally arranged at a part clinging to each of the two sides of the rectangular metal plate below the electromagnetic wave coupling slot, the center of the rectangular metal plate on which the rectangular metal edges are additionally arranged is provided with a rectangular hole to act as a channel for electron beams and provide a necessary channel for the electron beams. The time-efficient slow wave line with the trapezoidal line structure is a ridge loading rectangular waveguide, and compared with a rectangular waveguide of the same size, the cut-off wavelength of a TE10 mold is longer, thereby being applicable to lower frequencies, and having a wider working frequency band. Meanwhile, a longitudinal electric field at the electron beam channel is enabled to be enhanced because of the existence of the rectangular metal ridges, thereby being capable of acquiring higher coupling impedance, and enabling a travelling wave tube to have higher gain and efficiency.
Description
Technical field
The utility model belongs to microwave vacuum technical field of electronic devices, more specifically says, relates to a kind of ladder track structure slow wave line in travelling wave tube.
Background technology
The electron tube that travelling wave tube is most widely used as microwave frequency band, has outstanding application status in various fields such as millimetre-wave radar, guidance, communication, microwave remote sensing, radiation measurements.Due to its broadband feature can not be substituted, modern travelling wave tube has become most important a kind of microwave tube in the equipment of each field.
A typical travelling wave tube is made up of electron gun, focusing system, slow wave line (slow wave structure), input/output unit and collector five parts.As the core component of travelling wave tube, the task of slow wave line is carry high frequency electromagnetic running wave and makes electromagnetic phase velocity drop to synchronizing speed, to realize the modulation of electromagnetic wave to electron beam, amplifies radio-frequency field thereby make electron beam surrender DC energy.Therefore, slow wave line is as the core component of dominant wave interaction of traveling wave tubes excitation microwave energy, and its performance has directly determined bandwidth of operation, power output and the efficiency etc. of travelling wave tube, is determining the technical merit of travelling wave tube.
In travelling wave tube, most popular slow wave structure is coupling cavity and helix.
The dispersion characteristics of helical line slow-wave structure are smooth, and working band is wide, in the travelling wave tube of low-frequency range, are widely used; But due to factors such as heat radiation difficulties, the power output of helix TWT is restricted; Particularly when travelling wave tube is operated in centimetre and when millimere-wave band, because helix lateral dimension is minimum, heat radiation difficulty, and the size of electron beam passage becomes very little, seriously restricted its power capacity.
Traditional Coupled-Cavity Slow Wave comprises Hughes's structure, cloverleaf structure, Chodoro-Ndos structure etc.Compared to helical line slow-wave structure, Coupled-Cavity Slow Wave adopts multiple cavitys as slow wave structure, therefore have larger coupling impedance, thereby interaction efficiency is higher; By selecting suitable cavity size and cavity coupling technique, can improve the speed of electron beam, thereby can realize high peak power; In addition, because Coupled-Cavity Slow Wave belongs to the all-metal construction being made up of copper and iron substantially, mechanical strength is high, thermal resistance is little, can provide higher average power, but the bandwidth of Coupled-Cavity Slow Wave is narrower.In addition, at millimeter wave band, Coupled-Cavity Slow Wave small-sized, the major issue according to the facing manufacturing technology of the Coupled-Cavity Slow Wave of traditional approach design: require very harsh, assembly precision to require high to the mismachining tolerance of part, rate of finished products is low, and cost is high.
Ladder track structure slow wave line is the simple coupling cavity structure of a kind of simple in structure, easy processing.It is by slotting on copper coin, the mode of formation " ladder " shape or " comb " shape structure is manufactured, utilize in the mode of broach top cutting half slot and form electron beam channel, then by weld parts identical two structures together, the cover plate of burn-oning on the two sides of ladder track assembly has just formed whole high-frequency circuit.
According to connecting the difference of coupling channel position, ladder track structure slow wave line can be divided into three kinds: have two trapezium structures that connect coupling channels, have the trapezium structure of staggered coupling channel and have the trapezium structure of two channels interleaveds.Wherein two trapezium structures that connect coupling channel have maximum power, and the wrong ladder track of double cross has the widest working band, and the performance of the wrong ladder track of single cross is comparatively balanced.
The rectangular metal plate of ladder track structure slow wave line and the contact area of rectangular waveguide are large, and heat-sinking capability is very strong, and therefore the power capacity of ladder track structure slow wave line is large, has the ability to bear the operating state of high-output power, and this is its first advantage.When electromagnetic wave in ladder track structure slow wave line when unit of transfer's length the change amount (phase shift) of phase place increase, when frequency reduces (negative dispersion state) on the contrary, the operating voltage of travelling wave tube is low; And the coupling slot size of change ladder track structure slow wave line can change the variation tendency of electromagnetic phase shift with frequency, therefore, ladder track structure slow wave line has advantages of that operating voltage is low, and this is its 3rd advantage.
Although ladder track structure slow wave line has above-mentioned advantage, single chamber gain of ladder track structure slow wave line is lower, and therefore ability magnify power and gain are smaller, and the length needing in the time being applied to travelling wave tube is longer.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of ladder track structure slow wave line is provided, under comparable size, improve the working band of ladder track structure slow wave line, and further improve its coupling impedance, thereby make travelling wave tube there is higher gain and efficiency.
For achieving the above object, the utility model ladder track structure slow wave line, comprising:
One section of straight rectangular waveguide, the cross sectional dimensions of rectangular waveguide is determined by operating frequency;
It is characterized in that, also comprise:
Multi-disc rectangular metal plate, the both sides of every a slice rectangular metal plate, are added with rectangular metal ridge in vertical direction center;
Rectangular opening is opened in every rectangular metal plate center that is added with rectangular metal ridge, and as electron beam passage, every one end that is added with the rectangular metal plate of rectangular metal ridge has rectangular channel, as electromagnetic wave coupling slot;
The rectangular metal plate that is added with rectangular metal ridge is carried in rectangular waveguide, and is staggered by the fixed cycle, has formed ridge and has loaded ladder track structure slow wave line;
Wherein, described interlocking is alternately positioned at the upper and lower inwall of rectangular waveguide for the rectangular channel of the rectangular metal plate that is added with rectangular metal ridge, the width edge length of described rectangular metal ridge is less than width of rectangular and is greater than 1/2nd width of rectangular, and the narrow edge lengths of rectangular metal ridge equals rectangular metal plate height and deducts rectangular channel height.
Goal of the invention of the present utility model is achieved in that
The utility model ladder track structure slow wave line, rectangular metal plate is periodically staggered in rectangular waveguide, open rectangular channel as electromagnetic wave coupling slot at the upper and lower inwall adjacent of rectangular waveguide, so that electromagnetic wave can pass through, below electromagnetic wave coupling slot, be close to both sides, rectangular metal plate place and be added with respectively a rectangular metal ridge, opening a rectangular opening at the rectangular metal plate center that is added with rectangular metal ridge provides electron beam necessary passage as electron beam passage.When normal work, suitably select the size of rectangular metal plate center rectangle electron beam passage, just can make electron beam pass through, and electromagnetic wave can not pass through, electromagnetic wave can only transmit by rectangular channel.
The utility model ladder track structure slow wave line is ridge rectangular wave guide loaded asymmetrical medium, with respect to the rectangular waveguide of same size, the cut-off wavelength of its TE10 mould is longer, be applicable to lower frequency, have wider working band, therefore ridge loading ladder track structure slow wave line of the present utility model has wider working band; Meanwhile, due to the existence of rectangular metal ridge, make to be enhanced in the longitudinal electric field at electron beam passage place, thereby can obtain higher coupling impedance, thereby there is higher interaction efficiency, make travelling wave tube there is higher gain and efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art ladder track structure slow wave line;
Fig. 2 is a kind of embodiment structural representation of the utility model ladder track structure slow wave line;
Fig. 3 is the size marking figure of rectangular metal plate and rectangular metal ridge in the structure of ladder track shown in Fig. 2 slow wave line;
Fig. 4 is the dispersion characteristics comparison diagram of the utility model ladder track structure slow wave line and existing ladder track structure slow wave line;
Fig. 5 is the coupling impedance Character Comparison figure of the utility model ladder track structure slow wave line and existing ladder track structure slow wave line.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described, so that those skilled in the art understands the utility model better.Requiring particular attention is that, in the following description, in the time that perhaps the detailed description of known function and design can desalinate main contents of the present utility model, these are described in here and will be left in the basket.
Fig. 1 is the structural representation of prior art ladder track structure slow wave line.
As shown in Figure 1, ladder track structure slow wave line is arranged and is formed by connecting by a series of rectangular metal plate 3 being carried in rectangular waveguide, it is coupling slot 1 that every one end has rectangular channel, it is that rectangular metal plate 3 was staggered by the fixed cycle that rectangular channel is alternately positioned at the upper and lower inwall of rectangular waveguide, between two rectangular metal plate 3, form coupling cavity 2, rectangular opening is opened as electron beam passage 4 in rectangular metal plate 3 centers.Electron beam transmits along electron beam passage 4, electromagnetic wave along coupling slot 1, coupling cavity 2 transmit and in coupling cavity 2 electron gain beam energy, amplified.
Fig. 2 is a kind of embodiment structural representation of the utility model ladder track structure slow wave line.
In the present embodiment, as shown in Figure 2, the utility model ladder track structure slow wave line comprises one section of straight rectangular waveguide, and the cross sectional dimensions of rectangular waveguide is determined by operating frequency.In addition, also comprise multi-disc rectangular metal plate 3, the both sides of every a slice rectangular metal plate 3, are added with rectangular metal ridge 5 in vertical direction center;
Rectangular opening is opened as electron beam passage 4 in every rectangular metal plate 3 centers that are added with rectangular metal ridge, and every one end that is added with the rectangular metal plate of rectangular metal ridge has rectangular channel as electromagnetic wave coupling slot 1;
The rectangular metal plate 3 that is added with rectangular metal ridge is carried in rectangular waveguide, and is staggered by the fixed cycle, has formed ridge and has loaded ladder track structure slow wave line;
Wherein, described interlock for the rectangular channel of the rectangular metal plate 3 that is added with rectangular metal ridge be that electromagnetic wave coupling slot 1 is alternately positioned at the upper and lower inwall of rectangular waveguide, the width edge length 5 of described rectangular metal ridge is less than rectangular channel 1 width and is greater than 1/2nd width of rectangular, and the narrow edge lengths of rectangular metal ridge 5 equals rectangular metal plate 3 and highly deducts rectangular channel 1 height.Between two rectangular metal plate 3, form coupling cavity 2.On rectangular metal plate 3 placement directions, differ 180 °, so just formed staggered rectangle electromagnetic wave passage.
Certainly in specific implementation process, also can adopt by slotting on copper coin, form " ladder " shape with ridge or the mode of " comb " shape structure and manufacture.
Fig. 3 has marked out each dimensional parameters of rectangular metal plate and rectangular metal ridge, and the height that wherein a is rectangular metal plate is also the channel height of rectangular waveguide; B is the width of rectangular metal plate, is also the channel width of rectangular waveguide; W is the width edge length of rectangular metal ridge, and s is the narrow edge lengths of rectangular metal ridge, and t is the thickness of rectangular metal ridge; L is the width of rectangular channel, the height that d is rectangular channel; M is the height of electron beam passage, and n is electron beam channel width; C is the thickness of rectangular metal plate, p is the spacing of two adjacent rectangle metallic plates, and p-c-2t is that the distance in space between two adjacent rectangle metallic plates is gap thickness, and relevant size meets: l/2<w<l, s=a-d, t<c/4.
At Ka wave band, the physical dimension of the utility model ladder track structure slow wave line concrete scheme following (unit: mm): a=3.7, b=6, c=0.9, l=4.9, d=0.48, p=1.8, m=0.2, n=2, w=4.5, t=0.1.
Utilize 3 D electromagnetic simulation software to carry out analogue simulation to the utility model ladder track structure slow wave line, obtain its dispersion characteristics and coupling impedance characteristic, and compare with dispersion characteristics and the coupling impedance characteristic of prior art ladder track structure slow wave line, simulation result as shown in Figure 4 and Figure 5, wherein in Fig. 4, curve 1 is the dispersion characteristics of the utility model ladder track structure slow wave line, and curve 2 is dispersion characteristics of prior art ladder track structure slow wave line; In Fig. 5, curve 3 is coupling impedances of the utility model ladder track structure slow wave line, and curve 4 is coupling impedance characteristics of prior art ladder track structure slow wave line.
Relatively can significantly the finding out of curve 1 and curve 2 from Fig. 4: the utility model ladder track structure slow wave line has lower cut-off frequency than prior art ladder track structure slow wave line, wider free transmission range, dispersion curve is more smooth, can in wider frequency range, realize note-Bo mutual effect synchronous condition.Change an angle, if require identical cut-off frequency, the sectional dimension of ridge loading ladder track structure slow wave line is less.This just makes corresponding the reducing of field regions radius of periodic perperiodic permanent magnet focusing system, thereby be conducive to improve the longitudinal magnetic field intensity on axis, can more effectively utilize magnetic field resource, so, in the situation that beam current is identical, can better guarantee the circulation of electron beam in passage.
Relatively can significantly the finding out of curve 3 and curve 4 from Fig. 5: the utility model ladder track structure slow wave line has larger coupling impedance than prior art ladder track structure slow wave line, mean in the time noting ripple mutual effect, electron beam can be given electromagnetic field of high frequency more energy, obtains larger power stage and gain.
Although above the illustrative embodiment of the utility model is described; so that those skilled in the art understand the utility model; but should be clear; the utility model is not limited to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present utility model determined in; these variations are apparent, and all innovation and creation that utilize the utility model design are all at the row of protection.
Claims (2)
1. a ladder track structure slow wave line, comprising:
One section of straight rectangular waveguide, the cross sectional dimensions of rectangular waveguide is determined by operating frequency;
It is characterized in that, also comprise:
Multi-disc rectangular metal plate, the both sides of every a slice rectangular metal plate, are added with rectangular metal ridge in vertical direction center;
Rectangular opening is opened in every rectangular metal plate center that is added with rectangular metal ridge, and as electron beam passage, every one end that is added with the rectangular metal plate of rectangular metal ridge has rectangular channel, as electromagnetic wave coupling slot;
The rectangular metal plate that is added with rectangular metal ridge is carried in rectangular waveguide, and is staggered by the fixed cycle, has formed ridge and has loaded ladder track structure slow wave line;
Wherein, described interlocking is alternately positioned at the upper and lower inwall of rectangular waveguide for the rectangular channel of the rectangular metal plate that is added with rectangular metal ridge, the width edge length of described rectangular metal ridge is less than width of rectangular and is greater than 1/2nd width of rectangular, and the narrow edge lengths of rectangular metal ridge equals rectangular metal plate height and deducts rectangular channel height.
2. ladder track structure slow wave line claimed in claim 1, is characterized in that, the thickness t <c/4 of described rectangular metal ridge, wherein, the thickness that c is rectangular metal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320794045.1U CN203607364U (en) | 2013-12-05 | 2013-12-05 | Slow wave line of trapezoidal line structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320794045.1U CN203607364U (en) | 2013-12-05 | 2013-12-05 | Slow wave line of trapezoidal line structure |
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| CN203607364U true CN203607364U (en) | 2014-05-21 |
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| CN201320794045.1U Withdrawn - After Issue CN203607364U (en) | 2013-12-05 | 2013-12-05 | Slow wave line of trapezoidal line structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632905A (en) * | 2013-12-05 | 2014-03-12 | 电子科技大学 | Trapezoidal line structured slow wave line |
| CN105513925A (en) * | 2015-12-08 | 2016-04-20 | 中国电子科技集团公司第十二研究所 | Method for eliminating first stop band of folded waveguide slow-wave structure |
| CN111342185A (en) * | 2018-12-18 | 2020-06-26 | 日本电产株式会社 | Waveguide device, antenna device, and communication device |
-
2013
- 2013-12-05 CN CN201320794045.1U patent/CN203607364U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632905A (en) * | 2013-12-05 | 2014-03-12 | 电子科技大学 | Trapezoidal line structured slow wave line |
| CN103632905B (en) * | 2013-12-05 | 2015-12-02 | 电子科技大学 | A kind of ladder track structure slow wave line |
| CN105513925A (en) * | 2015-12-08 | 2016-04-20 | 中国电子科技集团公司第十二研究所 | Method for eliminating first stop band of folded waveguide slow-wave structure |
| CN111342185A (en) * | 2018-12-18 | 2020-06-26 | 日本电产株式会社 | Waveguide device, antenna device, and communication device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140521 Effective date of abandoning: 20151202 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140521 Effective date of abandoning: 20151202 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |