CN210984686U - Rectangular frame-double-rod slow wave structure - Google Patents
Rectangular frame-double-rod slow wave structure Download PDFInfo
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- CN210984686U CN210984686U CN202020125278.2U CN202020125278U CN210984686U CN 210984686 U CN210984686 U CN 210984686U CN 202020125278 U CN202020125278 U CN 202020125278U CN 210984686 U CN210984686 U CN 210984686U
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Abstract
The utility model relates to a rectangular frame-double-rod slow wave structure, belonging to a travelling wave tube amplifier. The utility model comprises a rectangular shielding cylinder 1, a medium substrate 2 and a frame-rod slow wave circuit; the frame-rod slow wave circuit is a rectangular frame-double-rod slow wave circuit, and a pair of symmetrically distributed metal connecting rods is connected between adjacent rectangular metal wire frames. The utility model discloses can directly use spark-erosion wire at vertical and two perpendicular directions whole cutting process, processing is simple, and the wholeness is good, and the machining precision is high, assembles simply and guarantees the precision easily. The utility model discloses an electromagnetic wave that propagates in the banded electron beam of the same electrical parameter and the slow wave structure carries out the interact, compares with current frame-pole slow wave structure, not only has wideer working frequency band, has higher coupling impedance in the working frequency channel moreover, can further improve the working bandwidth and the output of travelling wave tube.
Description
Technical Field
The utility model relates to a rectangular frame-double-rod slow wave structure, belonging to a travelling wave tube amplifier.
Background
The traveling wave tube has wide application as a microwave power amplifier in the fields of communication, radar, electronic countermeasure and the like. Compared with a solid-state electronic device, the traveling wave tube has the outstanding advantages of wide frequency band, high gain, long service life and the like.
Among the components of the traveling wave tube, the slow wave system is a key component for determining the performance thereof. Electromagnetic waves with the phase velocity smaller than the light velocity are transmitted in the slow wave structure, when the velocity of the electromagnetic waves and the velocity of the externally added electron beam meet the synchronous condition, the electromagnetic waves and the externally added electron beam have the beam-wave interaction, the kinetic energy of the electron beam is converted into the energy of the electromagnetic waves, and the microwave power is amplified.
Higher operating frequencies and greater output power are two main directions of development for current traveling wave tubes. The traditional round spiral slow wave structure has the advantage of flat dispersion, and the traveling wave tube based on the slow wave structure can achieve octave bandwidth. However, the coupling impedance of the spiral is low, so that the output power is limited. In order to improve the output power of the traveling wave tube, researchers have proposed slow wave structures such as rectangular spiral lines, rectangular frames and single rods. The rectangular spiral line has the dispersion characteristic close to that of the traditional circular spiral line, but has larger coupling impedance, and the rectangular frame-single-rod slow-wave structure belongs to a double-winding type spiral line slow-wave structure, and the coupling impedance of the rectangular frame-single-rod slow-wave structure is obviously improved compared with the rectangular spiral line under the condition of the same structural parameters.
Although the coupling impedance of the rectangular frame-single-rod slow-wave structure is greatly improved compared with that of a rectangular spiral line, the working frequency band of the rectangular frame-single-rod slow-wave structure is relatively small. Along with the improvement of travelling wave tube operating frequency, the size of slow wave structure becomes littleer and more, has that the slow wave structure processing degree of difficulty is big, the machining precision is low scheduling problem, and the reduction of size also makes the passageway size of electron beam diminish, is unfavorable for big current electron beam to pass through. These factors have hindered the need for traveling wave tubes to be developed for high frequencies and high power.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rectangular frame-two pole slow wave structures further promote the operating frequency band and the output of frame-pole slow wave structure travelling wave tube.
A rectangular frame-double-rod slow wave structure comprises a rectangular shielding cylinder 1, a medium substrate 2 and a frame-rod slow wave circuit;
the frame-rod slow wave circuit is a rectangular frame-double-rod slow wave circuit, and a pair of symmetrically distributed metal connecting rods is connected between adjacent rectangular metal wire frames.
The pair of metal connecting rods are sequentially and alternately positioned on the central connecting line of the long side and the short side of the rectangular metal wire frame.
The pair of metal connecting rods are sequentially and alternately positioned on the opposite corners of the rectangular metal wire frame.
The lengths of the metal connecting rods between the adjacent rectangular metal wire frames are all equal, or the lengths are gradually increased or gradually decreased, or the lengths are randomly changed.
The utility model discloses can directly use spark-erosion wire at vertical and two perpendicular directions whole cutting process, processing is simple, and the wholeness is good, and the machining precision is high, assembles simply and guarantees the precision easily.
The utility model discloses an electromagnetic wave that propagates in the banded electron beam of the same electrical parameter and the slow wave structure carries out the interact, compares with current frame-pole slow wave structure, not only has wideer working frequency band, has higher coupling impedance in the working frequency channel moreover, can further improve the working bandwidth and the output of travelling wave tube.
Drawings
Fig. 1 is a schematic diagram of a prior art frame-rod slow wave structure.
Fig. 2 is a schematic structural diagram of embodiment 1 (frame-center double rod) of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 2 (frame-diagonal double bar) of the present invention.
Fig. 4 is a three-dimensional view of embodiment 1 of the present invention.
Fig. 5 is a three-dimensional view of embodiment 2 of the present invention.
Fig. 6 is a schematic diagram comparing the dispersion curve of the present invention with the existing rectangular frame-single rod slow wave structure.
Fig. 7 is a schematic diagram comparing the coupling impedance of the present invention with the existing rectangular frame-single rod slow wave structure.
In the figure: the device comprises a rectangular shielding cylinder 1, a dielectric substrate 2, an electron beam channel 4, a rectangular frame-single-rod slow-wave circuit 13, a rectangular frame-center double-rod slow-wave circuit 23 and a rectangular frame-diagonal double-rod slow-wave circuit 33.
Detailed Description
Example 1:
a rectangular frame-double-rod slow wave structure comprises a rectangular shielding cylinder 1, a medium substrate 2 and a frame-rod slow wave circuit; the frame-rod slow wave circuit is arranged on the central axis of the rectangular shielding cylinder 1, a medium substrate 2 with a rectangular frame cross section is distributed between the rectangular shielding cylinder 1 and the frame-rod slow wave circuit, and an electron beam channel 4 of a traveling wave tube is formed inside the frame-rod slow wave circuit; the frame-rod slow wave circuit is a rectangular frame-double-rod slow wave circuit and consists of a plurality of rectangular metal wire frames with the same size and a pair of symmetrically distributed metal connecting rods between the adjacent rectangular metal wire frames; the pair of metal connecting rods are sequentially and alternately positioned on the central connecting line of the long side and the short side of the rectangular metal wire frame, as shown in fig. 2.
Example 2:
a rectangular frame-double-rod slow wave structure comprises a rectangular shielding cylinder 1, a medium substrate 2 and a frame-rod slow wave circuit; the frame-rod slow wave circuit is arranged on the central axis of the rectangular shielding cylinder 1, a medium substrate 2 with a rectangular frame cross section is distributed between the rectangular shielding cylinder 1 and the frame-rod slow wave circuit, and an electron beam channel 4 of a traveling wave tube is formed inside the frame-rod slow wave circuit; the frame-rod slow wave circuit is a rectangular frame-double-rod slow wave circuit and consists of a plurality of rectangular metal wire frames with the same size and a pair of symmetrically distributed metal connecting rods between the adjacent rectangular metal wire frames; the pair of metal connecting rods are alternately positioned on opposite corners of the rectangular metal wire frame in turn, as shown in fig. 3.
The embodiment of the utility model provides a relevant parameter: the dielectric substrate 2 having a rectangular frame cross section has a relative dielectric constant ofrThe width of an inner cavity of the rectangular metal wire frame is a, the height of the inner cavity is b, the thickness of the side of the rectangular metal wire frame is t, the axial thickness of the rectangular metal wire frame is w, the length of the metal connecting rod is L, the rod width is equal to the axial thickness of the rectangular metal wire frame and is w, the rod thickness is equal to the thickness of the side of the rectangular metal wire frame and is t, and the cycle length of the rectangular frame-double-rod slow wave circuit in a single cycle (the length between three adjacent rectangular metal wire frames) is p.
The specific parameters are set as follows: (except for the relative dielectric constant)rIn addition, the unit is: mm): relative dielectric constant of dielectric substrate 2 having rectangular frame cross sectionrThe method is characterized in that 4, w is 0.05, t is 0.02, L is 0.2, a is 1.08, b is 2.16, c is 1.72, d is 2.80, and p is 0.5, wherein c and d are the cavity width and the cavity height of the cross section of the rectangular shielding cylinder 1 respectively, a rectangular frame-dual-rod slow wave structure of the parameters is established by using three-dimensional electromagnetic simulation software, and simulation is carried out to obtain the dispersion characteristic and the coupling impedance of the rectangular frame-dual-rod slow wave structure, and the simulation result is shown in fig. 6 and fig. 7.
From a comparison of fig. 6, it can be seen that: under the same parameter condition, the utility model discloses have almost identical dispersion flatness with current rectangle frame-single pole slow wave structure, nevertheless the utility model discloses have apparent wideer working bandwidth. The working bandwidth of the existing rectangular frame-single rod slow wave structure is limited below 14.5GHz, while the working bandwidth of the embodiment 1 and the embodiment 2 reaches 27GHz, and the working bandwidth of the embodiment 1 and the embodiment 2 is improved by more than 80% on the basis of the working bandwidth of the existing rectangular frame-single rod slow wave structure. Moreover, the conclusion that the working bandwidth of the embodiments 1 and 2 is improved by more than 80% on the basis of the working bandwidth of the existing rectangular frame-single-rod slow-wave structure is also true when the structural parameters are changed under the condition of keeping the same size.
From a comparison in fig. 7 it can be seen that: under the same parameter condition, for current rectangle frame-single pole slow wave structure, the utility model discloses have higher coupling impedance at the well high frequency channel. At the central frequency point of 7GHz of the conventional rectangular frame-single-rod slow-wave structure, the coupling impedance of the embodiment 1 is almost completely equal to that of the conventional rectangular frame-single-rod slow-wave structure and is 17 ohms; whereas the coupling impedance of example 2 is slightly higher, 20 ohms. The center frequency point of the utility model is 13.5GHz, the coupling impedance of embodiment 1 is above 7 ohms, the coupling impedance of embodiment 2 is above 10 ohms, and the coupling impedance of the existing rectangular frame-single-rod slow-wave structure is below 1 ohm. In the frequency range of 7GHz-14GHz, the coupling impedance of the embodiment 1 of the utility model is improved by more than 40% compared with the coupling impedance of the existing rectangular frame-single-rod slow-wave structure. The coupling impedance of example 2 is greatly improved compared with example 2 in example 1.
It can be known from fig. 6 and fig. 7 that, under the same parameters and process conditions, the present invention can work in a higher frequency band and has a wider working bandwidth, and also has a higher coupling impedance and can obtain a higher output power in the working frequency band.
Claims (4)
1. A rectangular frame-double-rod slow wave structure comprises a rectangular shielding cylinder (1), a medium substrate (2) and a frame-rod slow wave circuit; the method is characterized in that:
the frame-rod slow wave circuit is a rectangular frame-double-rod slow wave circuit, and a pair of symmetrically distributed metal connecting rods is connected between adjacent rectangular metal wire frames.
2. The rectangular frame-dual bar slow wave structure of claim 1, wherein: the pair of metal connecting rods are sequentially and alternately positioned on the central connecting line of the long side and the short side of the rectangular metal wire frame.
3. The rectangular frame-dual bar slow wave structure of claim 1, wherein: the pair of metal connecting rods are sequentially and alternately positioned on the opposite corners of the rectangular metal wire frame.
4. The rectangular frame-dual bar slow wave structure of claim 1, wherein: the lengths of the metal connecting rods between the adjacent rectangular metal wire frames are all equal, or the lengths are gradually increased or gradually decreased, or the lengths are randomly changed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020125278.2U CN210984686U (en) | 2020-01-20 | 2020-01-20 | Rectangular frame-double-rod slow wave structure |
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| CN202020125278.2U CN210984686U (en) | 2020-01-20 | 2020-01-20 | Rectangular frame-double-rod slow wave structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113011068A (en) * | 2021-03-25 | 2021-06-22 | 赣江新区澳博颗粒科技研究院有限公司 | Three-dimensional simulation method for walking beam type plate blank heating |
| CN114005718A (en) * | 2021-10-29 | 2022-02-01 | 南通大学 | Connecting rod notch cuttype symmetrical split ring slow wave structure |
-
2020
- 2020-01-20 CN CN202020125278.2U patent/CN210984686U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113011068A (en) * | 2021-03-25 | 2021-06-22 | 赣江新区澳博颗粒科技研究院有限公司 | Three-dimensional simulation method for walking beam type plate blank heating |
| CN114005718A (en) * | 2021-10-29 | 2022-02-01 | 南通大学 | Connecting rod notch cuttype symmetrical split ring slow wave structure |
| CN114005718B (en) * | 2021-10-29 | 2023-08-04 | 南通大学 | Connecting rod ladder type symmetrical split ring slow wave structure |
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