CN101615554B - Curved groove loading winding waveguide slow wave line - Google Patents
Curved groove loading winding waveguide slow wave line Download PDFInfo
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- CN101615554B CN101615554B CN200910060071XA CN200910060071A CN101615554B CN 101615554 B CN101615554 B CN 101615554B CN 200910060071X A CN200910060071X A CN 200910060071XA CN 200910060071 A CN200910060071 A CN 200910060071A CN 101615554 B CN101615554 B CN 101615554B
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Abstract
The invention provides a curved groove loading winding waveguide slow wave line, relating to a travelling wave tube amplifying device in the technical field of microwave vacuum electronics. A series of arc (or right-angle) bend waveguides and straight waveguides are connected end to end to form a winding waveguide structure; each bend waveguide is provided with an opening along the broadside direction of the waveguides outboard; each opening position is connected with a curved groove; curved grooves at the same side of a central axis symmetric line share the same bending direction, while curved grooves at the two different sides of the central axis symmetric line have opposite bending directions; the whole winding waveguides and the chamber of the curved grooves are mutually communicated; the central axis symmetric line of the winding waveguide structure and the straight waveguides wall are provided with circular through holes at the point of intersections thereof; two through holes of all adjacent straight waveguide walls are connected by metal tubes with the same aperture size as the aperture size of the circular through holes to form electron bunch channel. In the invention, the curved grooves are loaded to improve field distribution in conventional winding waveguide slow wave line, and the slow wave line of the invention, compared with ordinary slow wave line, has broader bandwidth, higher output power and smaller device volume.
Description
Technical field
The invention belongs to the microwave vacuum electronic technology field, relate to the travelling wave tube amplification system, relate in particular to the waveguide slow wave line in the travelling wave tube amplification system.
Background technology
Modern travelling wave tube has become the important microwave electronic device of electronic equipments such as radar, electronic countermeasures, satellite communication, navigation, remote sensing.Slow wave line then is the core of travelling wave tube as the parts of travelling wave tube notes-Bo mutual effect with excitation amplification microwave energy, and its performance is directly determining the technical merit of travelling wave tube.In travelling wave tube, most popular slow wave structure is helix and coupling cavity.The dispersion characteristics of helix are smooth, and working band is wide, obtained extensive use in travelling wave tube; But the power output of helix TWT is restricted, particularly when travelling wave tube works in short centimetre and millimere-wave band, because the helix lateral dimension is minimum, and the heat radiation difficulty, its power capacity is little.The coupling impedance height of coupling cavity, the interaction efficiency height, but this is a cost to reduce bandwidth.In addition, the millimeter wave coupled-cavity TWT is small-sized, and processing, assembly precision require high, and rate of finished products is low, the cost height.Therefore, searching can be operated in millimere-wave band, and the novel TWT slow wave structure of function admirable just seems very necessary.
Winding waveguide slow wave line as shown in Figure 1, is the novel all-metal slow wave line of a class, and it is periodically bent to perpendicular type meander line or U type meander line and form along electric field face (the wide face of waveguide) by rectangular waveguide 1; At position opened round through hole on wave guide wall along the axis line of symmetry 2 of slow wave structure; Periodically between two manholes of trough with straight angle or U type groove, use the metal tube identical 3 to connect in each of slow wave structure then, form electronics and annotate passage with the manhole aperture size.Winding waveguide slow wave line longitudinally the plane of symmetry profile as shown in Figure 2.This slow wave structure has good broadband performance when realizing high power capacity.This structure mainly contains that mechanical strength height, good heat dissipation, power capacity are big, processing is than being easier to and the relatively simple advantage of input and output coupled structure.Simultaneously, owing to can adopt Micrometer-Nanometer Processing Technology manufacturing, the miniature winding waveguide travelling wave tube that with the winding waveguide slow wave structure is core becomes a kind of high-power, miniaturized radiation source in that millimere-wave band is very potential, has good application prospects in fields such as military electronic system and broadband millimeter-wave communications.
According to existing domestic and international related experiment report, though the broader bandwidth of winding waveguide slow wave structure, its volume and power output still can not satisfy the requirement of travelling wave tube to the development of miniaturization high power.In addition, for the range of application that makes the winding waveguide slow wave structure is more extensive, the bandwidth of further expanding it is also necessary.
Summary of the invention
In order to improve the power output of winding waveguide slow wave line, reduce its device volume, further expand its bandwidth simultaneously, the present invention proposes a kind of curved groove loading winding waveguide slow wave line.
Core starting point of the present invention is to utilize cycle load bending groove, improve the field distribution in the conventional winding waveguide slow wave line, the extension bandwidth also improves the power gain of each unit length in the slow wave line, promote total power output and reduce power needed device length when saturated with this, reach the purpose of broadband, high power, miniaturization.
The technical solution adopted in the present invention is:
A kind of curved groove loading winding waveguide slow wave line, extremely shown in Figure 4 as Fig. 3, be formed by connecting from beginning to end by series of arc curved waveguide (or right-angle bending waveguide) and straight wave guide, be equal to by rectangular waveguide 1 and periodically bend to U type meander line (or perpendicular type meander line) along the electric field face, formation winding waveguide structure; The outside of each circular arc curved waveguide (or right-angle bending waveguide) has opening along the waveguide broadside, and each opening part connects a curved slot 4; And be in the bending direction unanimity of all curved slot 4 of axis line of symmetry 2 tops, it is consistent and opposite with the bending direction of the curved slot 4 of axis line of symmetry 2 tops to be in the bending direction of all curved slot 4 of axis line of symmetry 2 belows; The cavity of whole winding waveguide and curved slot is communicated with each other; Have manhole at the axis line of symmetry 2 of winding waveguide structure and the intersection point place of straight wave guide wall; Between two through holes of all adjacent straight wave guide walls, use the metal tube identical 3 to connect, form electronics and annotate passage with the manhole aperture size.
In the such scheme, described curved slot 4 can be the quarter bend crank slot, also can be the circular arc curved slot.
The dimensional parameters of curved groove loading winding waveguide slow wave line is as shown in Figure 4: a is the rectangular waveguide width edge length, and b is the narrow edge lengths of rectangular waveguide, and L is the meander length of single tortuous periodic structure, and p is the axial length of single tortuous periodic structure, r
0Be the radius of electronics notes passage, b
0Be the narrow edge lengths of curved slot, p
0Be curved slot axial length, h
0Be the curved slot lateral length.
Set above-mentioned curved groove loading winding waveguide slow wave line physical dimension (unit: mm): a=5, b=0.7, L=3.1, p=1.2, r
0=0.5, b
0=0.5, p
0=1.2, h
0=0.68.Utilize the 3 D electromagnetic simulation software that curved groove loading winding waveguide slow wave line is carried out emulation, obtain its coupling impedance characteristic, and compare with common winding waveguide, the result as shown in Figure 5.Curve 5 is the coupling impedance characteristic of common winding waveguide slow wave line, and curve 6 is the coupling impedance characteristic of curved groove loading winding waveguide slow wave line provided by the invention.
Utilize three-dimensional notes-Bo mutual effect simulation software that the power output of curved groove loading winding waveguide slow wave line provided by the invention and bandwidth, device length required when power is saturated have been carried out emulation respectively, and compared with common winding waveguide slow wave line.Fig. 6 is the comparing result of power and bandwidth, and wherein curve 7 is the power output and the bandwidth performance of common winding waveguide slow wave line, and curve 8 is the power output and the bandwidth performance of curved groove loading winding waveguide slow wave line provided by the invention; Fig. 7 is the simulation result of common winding waveguide slow wave line power required device length when saturated; Fig. 8 is the simulation result of curved groove loading winding waveguide slow wave line power provided by the invention required device length when saturated.
The invention has the beneficial effects as follows:
Curve 5 can obviously be found out with the comparison of curve 6 from Fig. 5, curved groove loading winding waveguide slow wave line provided by the invention in whole working band under the same frequency coupling impedance all exceed common winding waveguide slow wave line more than 80%, mean the more effective support notes-Bo of its energy mutual effect, thereby improve the power output of travelling wave tube.
From the contrast of Fig. 7 and Fig. 8 when curved groove loading winding waveguide slow wave line power is saturated as can be seen required device length (134.4mm) to lack much than common winding waveguide slow wave line (174.2mm), significantly reduced the volume of device.
Description of drawings
Fig. 1 is the schematic perspective view of common winding waveguide slow wave line.
Fig. 2 is the profile of common winding waveguide slow wave line along y direction.
Fig. 3 is the schematic perspective view of curved groove loading winding waveguide slow wave line provided by the invention.
Fig. 4 is the cellular construction and the size marking figure of curved groove loading winding waveguide slow wave line provided by the invention.
Fig. 5 is the coupling impedance characteristic comparison diagram of curved groove loading winding waveguide slow wave line provided by the invention and common winding waveguide slow wave line.
Fig. 6 is the power and the bandwidth comparison diagram of curved groove loading winding waveguide slow wave line provided by the invention and common winding waveguide slow wave line.
Fig. 7 is the simulation result of common winding waveguide slow wave line power required device length when saturated.
Fig. 8 is the simulation result of curved groove loading winding waveguide slow wave line power provided by the invention required device length when saturated.
In above each figure: the 1st, rectangular waveguide, the 2nd, the axis line of symmetry of slow wave structure, the 3rd, form the metal tube that electronics is annotated passage, the 4th, curved slot, curve 5 is coupling impedance characteristics of common winding waveguide slow wave line, curve 6 is coupling impedance characteristics of curved groove loading winding waveguide slow wave line provided by the invention, and curve 7 is power and bandwidth characteristics of common winding waveguide slow wave line, and curve 8 is power and bandwidth characteristics of curved groove loading winding waveguide slow wave line provided by the invention.
Specific embodiments
As Fig. 5, in the 8mm millimere-wave band, the physical dimension of setting the curved groove loading winding waveguide slow wave line specific embodiments is (unit: mm): a=5, b=0.7, L=3.1, p=1.2, r
0=0.5, b
0=0.5, p
0=1.2, h
0=0.68.
Utilize 3 D electromagnetic simulation software and three-dimensional notes-Bo mutual effect simulation software that curved groove loading winding waveguide slow wave line is carried out emulation, obtain its coupling impedance, power output, bandwidth, required performances such as device length when power is saturated, and compare with common winding waveguide slow wave line.Curved groove loading winding waveguide slow wave line has higher coupling impedance, can export the power that is higher than 1.65 times of common winding waveguide slow wave lines in wideer frequency band with littler volume.
Claims (4)
1. a curved groove loading winding waveguide slow wave line is formed by connecting from beginning to end by series of arc curved waveguide and straight wave guide, promptly periodically bends to U type meander line by rectangular waveguide (1) along the electric field face, forms the winding waveguide structure; The outside of each circular arc curved waveguide has opening along the waveguide broadside, and each opening part connects a curved slot (4); And be in the bending direction unanimity of all curved slot (4) of axis line of symmetry (2) top, it is consistent and opposite with the bending direction of the curved slot (4) of axis line of symmetry (2) top to be in the bending direction of all curved slot (4) of axis line of symmetry (2) below; The cavity of whole winding waveguide and curved slot is communicated with each other; Have manhole at the axis line of symmetry (2) of winding waveguide structure and the intersection point place of straight wave guide wall; Between two through holes of all adjacent straight wave guide walls, use the metal tube (3) identical to connect, form electronics and annotate passage with the manhole aperture size.
2. a curved groove loading winding waveguide slow wave line is formed by connecting from beginning to end by a series of right-angle bending waveguides and straight wave guide, promptly periodically bends to the perpendicular type meander line by rectangular waveguide (1) along the electric field face, forms the winding waveguide structure; The outside of each right-angle bending waveguide has opening along the waveguide broadside, and each opening part connects a curved slot (4); And be in the bending direction unanimity of all curved slot (4) of axis line of symmetry (2) top, it is consistent and opposite with the bending direction of the curved slot (4) of axis line of symmetry (2) top to be in the bending direction of all curved slot (4) of axis line of symmetry (2) below; The cavity of whole winding waveguide and curved slot is communicated with each other; Have manhole at the axis line of symmetry (2) of winding waveguide structure and the intersection point place of straight wave guide wall; Between two through holes of all adjacent straight wave guide walls, use the metal tube (3) identical to connect, form electronics and annotate passage with the manhole aperture size.
3. curved groove loading winding waveguide slow wave line according to claim 1 and 2 is characterized in that, described curved slot (4) is the quarter bend crank slot.
4. curved groove loading winding waveguide slow wave line according to claim 1 and 2 is characterized in that, described curved slot (4) is the circular arc curved slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910060071XA CN101615554B (en) | 2009-07-22 | 2009-07-22 | Curved groove loading winding waveguide slow wave line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910060071XA CN101615554B (en) | 2009-07-22 | 2009-07-22 | Curved groove loading winding waveguide slow wave line |
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| Publication Number | Publication Date |
|---|---|
| CN101615554A CN101615554A (en) | 2009-12-30 |
| CN101615554B true CN101615554B (en) | 2011-02-09 |
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| CN200910060071XA Expired - Fee Related CN101615554B (en) | 2009-07-22 | 2009-07-22 | Curved groove loading winding waveguide slow wave line |
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| CN109936040B (en) * | 2019-04-04 | 2020-08-04 | 中国工程物理研究院应用电子学研究所 | Dielectric filling short pulse high-power microwave device |
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