CN105869971B - A kind of flat-head type sine waveguide slow-wave structure - Google Patents
A kind of flat-head type sine waveguide slow-wave structure Download PDFInfo
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- CN105869971B CN105869971B CN201610346019.0A CN201610346019A CN105869971B CN 105869971 B CN105869971 B CN 105869971B CN 201610346019 A CN201610346019 A CN 201610346019A CN 105869971 B CN105869971 B CN 105869971B
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- wave structure
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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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- 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
- H01J23/28—Interdigital slow-wave structures; Adjustment therefor
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Abstract
The invention discloses a kind of flat-head type sine waveguide slow-wave structure, on the basis of sinusoidal waveguide slow-wave structure, is suitably compressed narrow side size b, the size of compression is equal to the height that upper and lower sine line periods striped relief is cut top so that dimensional parameters meet：b<hb+ 2h, wherein hbThe height of passage is noted for ribbon-like electron, h is the height of sine line periods striped relief.After tested, flat-head type sine waveguide slow-wave structure of the present invention has higher coupled impedance value, dispersion characteristics are improved simultaneously, traditional coupled impedance is so overcome to improve, and the defects of dispersion characteristics reduction, mean the interaction ability increase of electronics note and electromagnetic wave, and then improve power output, gain and the interaction efficiency of travelling-wave tubes.
Description
Technical field
The invention belongs to vacuum electronics technology field, more specifically, is related to a kind of flat-head type sine waveguide slow wave knot
Structure, suitable for millimeter wave, terahertz wave band vacuum electron device.
Background technology
THz wave is electromagnetic wave of the frequency between microwave and infrared band, and it is in high-speed space communication, superelevation
Resolution ratio weapon guidance, medical imaging, material terahertz light Spectral characteristics analysis, safety inspection, material tests etc. field have
Important researching value and it is widely applied prospect.Vacuum electron device is that by the one of high-power terahertz radiation source
The very promising device of kind.Travelling-wave tubes is using relatively more extensive a kind of millimeter wave, terahertz emission in vacuum electron device
Source, it has the characteristics that high-power, high efficiency, high-gain, broadband and long-life.Core of the slow-wave structure as travelling-wave tubes
Part, directly determine the device performance of travelling-wave tubes.
At present, the slow-wave structure mainly studied in terahertz wave band travelling-wave tubes mainly has folded waveguide, rectangle staggeredly double
The structures such as grid, double rectangle grid tooth.Because the operation wavelength in terahertz wave band is very short, slow-wave structure physical dimension is smaller,
Therefore difficulty of processing is big, machining accuracy is low so that the reflection of radio frequency system is big, loss is big." it is being applied to 0.22THz travelling-wave tubes
Sinusoidal waveguide " (《Electron Device Letters》2011, volume 32, No. 8,1152-1154 pages, author：Xu Xiong, Wei Yanyu etc.) text
In have studied the signal input, defeated of sinusoidal waveguide slow-wave structure (as shown in Figure 1) and a kind of matching uniformly gradual change a kind of
Go out coupler, based on this succinct, uniform gradual change input, output coupler, sinusoidal waveguide radio frequency system has the anti-of very little
Penetrate, very low transmission loss.However, electric-field intensity of this structure on electromagnetic transmission direction is relatively weak, thus its coupling
Conjunction impedance is smaller, and so as to cause, the power output of sine wave leading wave duct, interaction efficiency are smaller, gain is relatively low and saturation interaction
With length it is longer the defects of.
The content of the invention
It is an object of the invention to overcome in the prior art sinusoidal waveguide coupled impedance it is small, propose a kind of flat-head type sine wave
Slow-wave structure is led, to improve its coupled impedance, improves dispersion characteristics, and then improve power output, gain and the interaction of travelling-wave tubes
Use efficiency.
For achieving the above object, flat-head type sine waveguide slow-wave structure of the present invention, including：
One sinusoidal waveguide, its width edge length are a, and narrow edge lengths are b, and longitudinal direction (transmission direction) is centered on broadside up and down
The sine line periods striped relief to be risen and fallen, the height of sine line periods striped relief are h, sine line periods banding
The Cycle Length of fluctuating is p, and the width of sine line periods striped relief is a；
Passage is noted for ribbon-like electron between upper and lower sine line periods striped relief, the width of ribbon-like electron note passage is
The width edge length a of sinusoidal waveguide, it is highly hb；
Characterized in that, the sine line periods striped relief up and down being cut in ribbon-like electron note channel direction
Top, becomes flat-head type so that dimensional parameters meet：b<hb+2h。
The object of the present invention is achieved like this.
Flat-head type sine waveguide slow-wave structure of the present invention, on the basis of sinusoidal waveguide slow-wave structure, is suitably compressed narrow
Side size b, the size of compression are equal to the height that upper and lower sine line periods striped relief is cut top so that dimensional parameters meet：b
<hb+ 2h, wherein hbThe height of passage is noted for ribbon-like electron, h is the height of sine line periods striped relief.After tested, this hair
Bright flat-head type sine waveguide slow-wave structure has higher coupled impedance value, while dispersion characteristics are improved, and so overcome
The defects of traditional coupled impedance improves, and dispersion characteristics reduce, it is meant that electronics is noted to be increased with the interaction ability of electromagnetic wave
Add, and then improve power output, gain and the interaction efficiency of travelling-wave tubes.
Brief description of the drawings
Fig. 1 is the structural representation of the sinusoidal waveguide slow-wave structure of prior art；
Fig. 2 is a kind of embodiment structural representation of flat-head type sine waveguide slow-wave structure of the present invention；
Fig. 3 is sinusoidal waveguide slow-wave structure figure compared with the dispersion characteristics of flat-head type sine waveguide slow-wave structure；
Fig. 4 is sinusoidal waveguide slow-wave structure figure compared with the coupled impedance of flat-head type sine waveguide slow-wave structure；
Fig. 5 is sinusoidal waveguide slow-wave structure figure compared with the reflection parameters of flat-head type sine waveguide slow-wave structure；
Fig. 6 is sinusoidal waveguide slow-wave structure figure compared with the configured transmission of flat-head type sine waveguide slow-wave structure.
Embodiment
The embodiment of the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps
When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Fig. 1 is the structural representation of the sinusoidal waveguide slow-wave structure of prior art.
In the present embodiment, as shown in figure 1, a is waveguide broadside length, b is the sinusoidal waveguide slow-wave structure of prior art
Narrow Wall of Waveguide edge lengths, h be sine line periods striped relief height, p be sinusoidal line Cycle Length, sine line periods band
The width that shape rises and falls is a.In the present embodiment, in 220GHz frequency ranges, physical dimension is (unit：mm)：A=0.77mm, b=
0.57mm, p=0.46mm, h=0.215mm, hb=0.14mm, i.e. b=hb+2h。
Fig. 2 is a kind of embodiment structural representation of flat-head type sine waveguide slow-wave structure of the present invention.
In the present embodiment, as shown in Fig. 2 flat-head type sine waveguide slow-wave structure of the present invention includes sinusoidal waveguide 1, it is wide
Edge lengths are a, and narrow edge lengths are b, and longitudinal direction (length direction) is the sine line periods to be risen and fallen centered on broadside up and down
Striped relief 2, the height of sine line periods striped relief 2 is h, and the Cycle Length of sine line periods striped relief 2 is p,
The width of sine line periods striped relief 2 is a；
Passage is noted for ribbon-like electron between upper and lower sine line periods striped relief 2, the ribbon-like electron notes the width of passage
It is highly h for the width edge length a of sinusoidal waveguideb；
Flat-head type sine waveguide slow-wave structure of the present invention, shown in Fig. 2, on the basis of existing sinusoidal waveguide slow-wave structure,
In the case that other sizes keep constant, the narrow edge lengths b of appropriate compression, meanwhile, to upper and lower sine line periods striped relief
Carry out cutting top in ribbon-like electron note channel direction, it is become flat-head type, the height for cutting top is hsSo that dimensional parameters
Meet：b<hb+ 2h, that is, the part compressed is equal to cuts top sum 2h up and downs, 2hs=hb+2h-b。
In the present embodiment, in 220GHz frequency ranges, the physical dimension of flat-head type sine waveguide slow-wave structure of the present invention is (single
Position：mm)：A=0.77mm, b=0.50mm, p=0.46mm, h=0.215mm, hb=0.14mm, hs=0.035mm, i.e. b<hb+
2h, i.e., narrow edge lengths b have compressed 0.07mm, and compression section is exactly to cut top sum 2h up and downs=2 × 0.035mm=0.07mm.
In the present embodiment, as preferred plan, the height for cutting top is hs=hb/4。
Existing sinusoidal waveguide slow-wave structure and flat-head type sine waveguide slow wave of the present invention for above-mentioned 220GHz frequency ranges
Structure, calculated using 3 D electromagnetic simulation software HFSS, obtain its dispersion characteristics, coupled impedance disengaging is compared.Meanwhile profit
Simulated with 3 D electromagnetic simulation software CST 85 cycles each to two kinds of slow-wave structures, obtain the reflection of two kinds of slow-wave structures
Parameter and configured transmission.Simulation result as shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, wherein, curve 1, curve 3, curve 5, curve 7 are distinguished
It is the dispersion characteristic curve of flat-head type sine waveguide slow-wave structure of the present invention, coupled impedance curve, reflection parameters curve, transmission ginseng
Number curve；Curve 2, curve 4, curve 6, curve 8 are the dispersion characteristic curve of existing sinusoidal waveguide slow-wave structure, coupling resistance respectively
Anti- curve, reflection parameters curve, configured transmission curve.
Fig. 3 is existing sinusoidal waveguide slow-wave structure compared with the dispersion characteristics of flat-head type sine waveguide slow-wave structure of the present invention
Figure.
In the present embodiment, it was found from the curve 1 in Fig. 3 compares with curve 2, flat-head type sine waveguide slow wave of the present invention
Structure is compared to existing sinusoidal waveguide slow-wave structure, and in comparatively wide frequency band (195~235GHz), flat-head type of the present invention is sinusoidal
The normalization phase velocity of waveguide slow-wave structure is essentially identical, and in the high band higher than 235GHz, flat-head type sine waveguide of the present invention
The normalization phase velocity of slow-wave structure is slightly higher, and dispersion characteristics are improved.
Fig. 4 is existing sinusoidal waveguide slow-wave structure compared with the coupled impedance of flat-head type sine waveguide slow-wave structure of the present invention
Figure.
In the present embodiment, compare with curve 4 from the curve 3 in Fig. 4 and relatively can significantly find out, compared to it is existing just
String waveguide slow-wave structure, in comparatively wide frequency band (195~260GHz), flat-head type sine waveguide slow wave provided by the present invention
Structure has higher coupled impedance value.Illustrate that the coupled impedance of flat-head type sine waveguide slow-wave structure in the present invention is worth to
Effectively improve, meanwhile, with reference to Fig. 3, it will be seen that while coupled impedance improves, dispersion characteristics do not reduce, instead
And make moderate progress, it means that electronics is noted to be increased with the interaction ability of electromagnetic wave, and then is improved the power output of travelling-wave tubes, increased
Benefit and interaction efficiency.
Fig. 5 is sinusoidal waveguide slow-wave structure figure compared with the reflection parameters of flat-head type sine waveguide slow-wave structure.
In the present embodiment, it was found from the curve 5 in Fig. 5 compares with curve 6, compared to existing sinusoidal waveguide slow wave knot
Structure, in 195~225GHz frequency bands, the reflectance factor of flat-head type sine waveguide slow-wave structure of the present invention is substantially suitable.Higher than
In 225GHz frequency band, flat-head type sine waveguide slow-wave structure of the present invention has lower slightly reflection parameters.
Fig. 6 is sinusoidal waveguide slow-wave structure figure compared with the configured transmission of flat-head type sine waveguide slow-wave structure.
In the present embodiment, it was found from the curve 7 in Fig. 6 compares with curve 8, compared to existing sinusoidal waveguide slow wave knot
Structure, in 195~240GHz frequency bands, the transmission coefficient of flat-head type sine waveguide slow-wave structure of the present invention is substantially suitable.Higher than
In 240GHz frequency band, flat-head type sine waveguide slow-wave structure of the present invention has slightly higher configured transmission, it means that this new
Type slow-wave structure has even more excellent transmission characteristic suitable with sinusoidal waveguide slow-wave structure.
With reference to Fig. 5, Fig. 6, it will be seen that the relatively existing sinusoidal waveguide of flat-head type sine waveguide slow-wave structure of the present invention
Slow-wave structure, reflection parameters, configured transmission all do not have much affect, i.e., performance does not reduce, flat-head type sine waveguide of the present invention
Slow-wave structure has good performance.
Although the illustrative embodiment of the present invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of embodiment, to the common skill of the art
For art personnel, if various change in the spirit and scope of the present invention that appended claim limits and determines, these
Change is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (2)
1. a kind of flat-head type sine waveguide slow-wave structure, including：One sinusoidal waveguide, its width edge length are a, and narrow edge lengths are b, are indulged
It is up and down the sine line periods striped relief to be risen and fallen centered on broadside, sine line periods banding to i.e. transmission direction
The height of fluctuating is h, and the Cycle Length of sine line periods striped relief is p, and the width of sine line periods striped relief is
a；
Passage is noted for ribbon-like electron between upper and lower sine line periods striped relief, the width of ribbon-like electron note passage is sine
The width edge length a of waveguide, it is highly hb；
Characterized in that, the sine line periods striped relief up and down is cut top in ribbon-like electron note channel direction, become
Into flat-head type so that dimensional parameters meet：b<hb+2h。
2. slow-wave structure according to claim 1, it is characterised in that the described height for cutting top is hs=hb/4。
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| CN106443248B (en) * | 2016-09-12 | 2019-04-05 | 电子科技大学 | A kind of travelling-wave tubes saturated characteristic fast automatic measurement method |
| CN107887242A (en) * | 2017-11-06 | 2018-04-06 | 电子科技大学 | A kind of micro strip line type slow-wave structure of substrate fluting |
| CN110706992B (en) * | 2019-10-22 | 2020-09-08 | 电子科技大学 | Double-electron-beam-channel sine waveguide slow wave structure |
| CN110909515B (en) * | 2019-10-31 | 2022-03-25 | 电子科技大学 | Method for obtaining dispersion characteristic and coupling impedance of slow wave structure |
| CN110752131B (en) * | 2019-11-12 | 2020-09-01 | 电子科技大学 | Multi-electron-beam-channel slow-wave structure with trigonometric function profile |
| CN113113279B (en) * | 2021-04-15 | 2022-03-25 | 电子科技大学 | Cosine grid loading sine-like waveguide slow wave structure |
| CN113223910B (en) * | 2021-05-07 | 2022-03-11 | 电子科技大学 | Parallel multi-electron-beam flat-top type sine waveguide slow wave structure |
| CN114121575B (en) * | 2021-12-03 | 2024-08-27 | 电子科技大学长三角研究院(湖州) | Sine wave guide with sine grooves staggered |
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| CN102208315B (en) * | 2011-04-26 | 2012-11-14 | 中国人民解放军国防科学技术大学 | Compact relativity backward wave oscillator (RBWO) with adjustable low-frequency-range frequency |
| US9202660B2 (en) * | 2013-03-13 | 2015-12-01 | Teledyne Wireless, Llc | Asymmetrical slow wave structures to eliminate backward wave oscillations in wideband traveling wave tubes |
| CN103346056B (en) * | 2013-06-24 | 2015-11-04 | 合肥工业大学 | The Terahertz slow wave structure of two-stage series connection |
| CN203536356U (en) * | 2013-10-31 | 2014-04-09 | 电子科技大学 | A T-shaped staggered double-gate slow wave device |
| CN105513926B (en) * | 2015-12-21 | 2017-05-24 | 电子科技大学 | Ultra-wideband quasi-open slow-wave structure |
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