CN112863976B - Design method for electrical performance of spiral slow-wave circuit of L-band 500W space traveling wave tube - Google Patents
Design method for electrical performance of spiral slow-wave circuit of L-band 500W space traveling wave tube Download PDFInfo
- Publication number
- CN112863976B CN112863976B CN202110038231.1A CN202110038231A CN112863976B CN 112863976 B CN112863976 B CN 112863976B CN 202110038231 A CN202110038231 A CN 202110038231A CN 112863976 B CN112863976 B CN 112863976B
- Authority
- CN
- China
- Prior art keywords
- pitch
- section
- wave
- spiral line
- electron beam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000013461 design Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010894 electron beam technology Methods 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 239000011295 pitch Substances 0.000 claims description 73
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 abstract description 12
- 230000010349 pulsation Effects 0.000 abstract description 6
- 238000004364 calculation method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 230000010363 phase shift Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/34—Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
-
- 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
- H01J23/26—Helical slow-wave structures; Adjustment therefor
- H01J23/27—Helix-derived slow-wave structures
-
- 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
- H01J23/34—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
Landscapes
- Microwave Amplifiers (AREA)
Abstract
The invention discloses a design method for electrical properties of a spiral slow wave circuit of an L-band 500W space traveling wave tube, which relates to the technical field of slow wave circuits and specifically comprises the following steps: in the input modulation section, the electron beam is well modulated by adopting a gradual change pitch, and an alternating current component is formed to reduce group delay fluctuation; in the output spiral line clustered section, a pulse type pitch combined structure is adopted, and along with gradual enhancement of electron beam clustered, alternating current with higher amplitude is formed, and meanwhile harmonic wave is restrained from increasing fundamental wave amplitude; in the synchronous section of the output spiral line, a double negative jump structure is adopted, the phase velocity of the line wave is reduced to maintain the synchronous relation between the injection waves, so that the line wave is amplified, and the continuous increase of fundamental wave current is further ensured; and the pitch is increased at the tail end of the energy exchange section of the output spiral line, so that intermodulation component can be effectively reduced, and simultaneously, the defocusing of the electron beam is reduced, and further, the pulsation of the electron beam is ensured. Besides the high efficiency characteristic of the current navigation product, the traveling wave tube further innovates a slow wave structural design, and solves the problems of large group delay distortion, large second harmonic and large third-order intermodulation component which affect navigation accuracy.
Description
Technical Field
The invention relates to the technical field of slow wave circuits, in particular to an L-band 500W space traveling wave tube spiral slow wave circuit for a navigation satellite.
Background
The L-band space traveling wave tube is a core device of a Beidou navigation satellite system in China and is used for a transponder subsystem to be used as a final amplification of microwave power. At present, an L-band 135W space traveling wave tube is used on the satellite.
Along with the development of foreign GPS-III navigation system, galileo satellite navigation system and new generation Beidou navigation system in China, the influence of signal power enhancement on the quality of other navigation signals is analyzed from the two aspects of frequency spectrum overlapping and equivalent carrier-to-noise ratio of received signals, and the analysis result shows that when the signal enhancement amplitude is within 20dB, the anti-interference performance of the enhanced signals can be obviously improved. While the increase in signal amplitude is largely dependent on the increase in output power of the traveling wave tube.
Therefore, the new generation of Beidou navigation satellite system provides clear requirements for the larger power output performance of the L-band space traveling wave tube, and the design structure of the electrical performance of the spiral line slow wave circuit is particularly important.
Disclosure of Invention
The invention aims to solve the technical problems that an L-band 500W space traveling wave tube spiral slow wave circuit for a navigation satellite is designed aiming at the electrical property of the spiral slow wave circuit with high power and low nonlinear distortion of the L-band 500W space traveling wave tube in the background technology, and the traveling wave tube not only has the high efficiency characteristic of the existing navigation product, but also further innovates the slow wave structural design, thereby solving the problems of large group delay distortion, large second harmonic and large third-order intermodulation component which affect the navigation precision.
The invention adopts the following technical scheme for solving the technical problems:
the design method of the electrical performance of the spiral line slow wave circuit of the L-band 500W space traveling wave tube specifically comprises an input modulation section, an output spiral line grouping section, an output spiral line synchronizing section and an output spiral line energy exchange section, and specifically comprises the following steps:
step 1, in an input modulation section, adopting gradual change pitch to enable an electron beam to be well modulated, forming an alternating current component and reducing group delay fluctuation;
step 2, in the output spiral line clustered section, a pulse type pitch combined structure is adopted, along with gradual enhancement of electron beam clustered, alternating current with higher amplitude is formed, and meanwhile harmonic wave is restrained from increasing fundamental wave amplitude;
step 3, in the output spiral line synchronous section, a double negative jump structure is adopted, the phase velocity of the line wave is reduced to maintain the synchronous relation between the injection waves, so that the line wave is amplified, and further the continuous increase of fundamental wave current is ensured;
and step 4, increasing the screw pitch at the tail of the energy exchange section of the output spiral line, so that the intermodulation component can be effectively reduced, and the defocusing of the electron beam can be reduced, and further, the pulsation of the electron beam can be ensured.
As a further preferable scheme of the electrical performance design method of the spiral slow wave circuit of the L-band 500W space traveling wave tube, the synchronous voltage of the slow wave circuit is 4700V, and the total current is 255mA;
as a further preferable scheme of the electrical performance design method of the spiral line slow wave circuit of the L-band 500W space traveling wave tube, in an input modulation section, the pitch p1 is gradually changed to the pitch p2, wherein p1=1.71 mm, p2=1.85 mm, the total length of the input modulation section is 182.5mm, the pitch corresponding length of the p1 section is 68mm, the pitch corresponding length of the p2 section is 73.5mm, and the length of the gradual change section is 41mm.
As a further preferable scheme of the electrical performance design method of the spiral line slow wave circuit of the L-band 500W space traveling wave tube, the output clustered segment comprises a pitch p3, a pitch p4 and a pitch p5, wherein p3=1.99 mm, p4=1.88 mm and p5=2.06 mm, the pitch corresponding to the first segment of p3 is 104.5mm in length, the pitch corresponding to the first segment of p4 is 5mm in length, the pitch corresponding to the second segment of p4 is 13mm in length, and the pitch corresponding to the p5 segment is 63mm in length.
As a further preferable scheme of the electrical performance design method of the spiral line slow wave circuit of the L-band 500W space traveling wave tube, the output synchronous section comprises a pitch p5, a pitch p6 and a pitch p7, wherein p6=1.85 mm, p7=1.68 mm, and the lengths of the two gradual change sections are respectively 12.9mm and 18mm.
As a further preferable scheme of the electrical performance design method of the spiral line slow wave circuit of the L-band 500W space traveling wave tube, the output energy exchange section comprises a pitch p7 and a pitch p8, wherein p7=1.68 mm and p8=2.1 mm, and the corresponding lengths of the two pitches are 20mm and 2.1mm respectively.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects:
1. compared with the maximum power level of the currently used navigation product, the L-band 500W space traveling wave tube has obvious advantages, and has great research significance for the highest level of the currently developed space traveling wave tube for the navigation satellite;
2. besides the high efficiency characteristic of the current navigation product, the traveling wave tube further innovates a slow wave structural design, and solves the problems of large group delay distortion, large second harmonic and large third-order intermodulation component which affect navigation precision;
3. particularly, the novel pulse-type pitch combination structure is adopted to convert harmonic waves into fundamental waves, the harmonic waves are restrained, meanwhile, the electronic efficiency is improved, meanwhile, the large pitch is adopted at the tail end of the output spiral line, so that intermodulation components can be effectively reduced, meanwhile, the electron beam defocusing is reduced, and the small pulsation of the electron beam is ensured;
4. according to the design method of the slow wave circuit, the output power is larger than 600W, the electronic efficiency is larger than 50%, the second harmonic is below-30 dB, the group delay fluctuation is within 0.8ns, the saturation point phase shift is smaller than 40 degrees, and the third-order intermodulation is larger than the slow wave circuit with electrical performance indexes such as 10.5dB when the input rollback is 3 dB.
Drawings
FIG. 1 is a schematic diagram of a novel slow wave circuit design method of the present invention.
FIG. 2 is a schematic diagram of a pitch profile of a novel slow wave circuit of the present invention;
FIG. 3 is a schematic diagram of the slow wave circuit distribution in the MTSS software of the present invention;
FIG. 4 is a graph showing the result of the output power calculation according to the present invention;
FIG. 5 is a schematic diagram of the result of calculation of the electronic efficiency according to the present invention;
FIG. 6 is a graph showing the gain calculation results according to the present invention;
FIG. 7 is a schematic diagram of the phase shift calculation result of the present invention;
FIG. 8 is a schematic diagram of the second harmonic calculation result of the present invention;
fig. 9 is a schematic diagram of the group delay fluctuation calculation result of the present invention;
FIG. 10 is a diagram showing the result of the novel third-order intermodulation calculation according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to study the electrical performance design of a spiral line slow wave circuit with high power and low nonlinear distortion of an L-band 500W space traveling wave tube, obtain a design scheme through theoretical analysis and CAD simulation design, lay a foundation for the development of the L-band 500W space traveling wave tube, and finally promote the index of a new generation Beidou navigation satellite system.
Selecting proper voltage and current, adopting gradual change pitch in an input modulation section to enable an electron beam to be well modulated, forming an alternating current component and reducing group delay fluctuation; the output spiral line clustered segment innovatively adopts a pulse-type pitch combined structure, and along with gradual enhancement of electron beam clustered, alternating current with higher amplitude is formed, and meanwhile, the amplitude of fundamental wave is increased by differential modulation inhibition harmonic waves; the synchronous section of the output spiral line adopts a double negative jump structure, so that the phase velocity of the line wave is further reduced to maintain the synchronous relation between the injection waves, the line wave is amplified, and the continuous increase of fundamental wave current is ensured on the other hand; the tail end of the energy exchange section of the output spiral line is increased in pitch, so that intermodulation component can be effectively reduced, and meanwhile, electron beam defocusing is reduced, and electron beam pulsation is ensured.
Compared with the maximum power level of the currently used navigation product, the L-band 500W space traveling wave tube has obvious advantages, and has great research significance for the highest level of the currently developed space traveling wave tube for the navigation satellite. Besides the high efficiency characteristic of the current navigation product, the traveling wave tube further innovates a slow wave structural design, and solves the problems of large group delay distortion, large second harmonic and large third-order intermodulation component which affect navigation accuracy. Especially, the novel pulse type pitch combined structure is adopted to convert harmonic waves into fundamental waves, the harmonic waves are restrained, meanwhile, the electronic efficiency is improved, meanwhile, the large pitch is adopted at the tail end of the output spiral line, so that intermodulation components can be effectively reduced, meanwhile, the electron beam defocusing is reduced, and the small pulsation of the electron beam is ensured.
In the design process of the L-band 500W space traveling wave tube slow wave circuit, the high-efficiency 500W output power of fundamental wave signals is required to be realized, and meanwhile, nonlinear distortion such as second harmonic and intermodulation components is suppressed, so that the high navigation precision requirement of satellites is met. Under the high power requirement, the realization of the high efficiency and low linear distortion requirement needs to adopt a novel slow wave circuit gradual change, jump and difference modulation combined structure and a design method.
The slow wave circuit comprises a tube shell, a clamping rod, a spiral line, an input energy transmission device and an output energy transmission device; the spiral line is assembled in the tube shell through clamping rods with uniform intervals outside, the input energy transmission is connected with the left end of the tube shell, and the output energy transmission is connected with the right end of the tube shell;
the novel slow wave circuit design method is schematically shown in the following figure 1. The design method of the electrical performance of the spiral line slow wave circuit of the L-band 500W space traveling wave tube specifically comprises an input modulation section, an output spiral line grouping section, an output spiral line synchronizing section and an output spiral line energy exchange section, and specifically comprises the following steps:
unlike the traditional spiral space traveling wave tube gradual change structure, the slow wave circuit design method has the following characteristics:
step 1, in an input modulation section, adopting gradual change pitch to enable an electron beam to be well modulated, forming an alternating current component and reducing group delay fluctuation;
step 2, in the output spiral line clustered section, a pulse type pitch combined structure is adopted, along with gradual enhancement of electron beam clustered, alternating current with higher amplitude is formed, and meanwhile harmonic wave is restrained from increasing fundamental wave amplitude;
step 3, in the output spiral line synchronous section, a double negative jump structure is adopted, the phase velocity of the line wave is reduced to maintain the synchronous relation between the injection waves, so that the line wave is amplified, and further the continuous increase of fundamental wave current is ensured;
and step 4, increasing the screw pitch at the tail of the energy exchange section of the output spiral line, so that the intermodulation component can be effectively reduced, and the defocusing of the electron beam can be reduced, and further, the pulsation of the electron beam can be ensured.
The synchronous voltage of the slow wave circuit is 4700V, and the total current is 255mA;
in the input modulation section, the pitch p1 is gradually changed to the pitch p2, wherein p1=1.71 mm, p2=1.85 mm, the total length of the input modulation section is 182.5mm, the pitch corresponding length of the p1 section is 68mm, the pitch corresponding length of the p2 section is 73.5mm, and the length of the gradual change section is 41mm.
In the output clustered stage, the output clustered stage comprises a pitch p3, a pitch p4 and a pitch p5, wherein p3=1.99 mm, p4=1.88 mm and p5=2.06 mm, wherein the pitch of the first section of p3 corresponds to 104.5mm in length, the pitch of the second section is 5mm, the pitch of the first section of p4 corresponds to 20mm in length, the pitch of the second section is 13mm, and the pitch of the p5 section corresponds to 63mm in length.
In the output synchronous section, the pitch p5, the pitch p6 and the pitch p7 are included, wherein p6=1.85 mm and p7=1.68 mm, and the lengths of the two gradual change sections are respectively 12.9mm and 18mm.
In the output energy exchange section, a pitch p7 and a pitch p8 are included, wherein p7=1.68 mm and p8=2.1 mm, and the corresponding lengths of the two pitches are respectively 20mm and 2.1mm.
The calculation results of each parameter obtained by the slow wave circuit design method of the invention by using MTSS software are shown in figures 4-10.
In summary, by adopting the design method of the slow wave circuit, the output power is more than 600W, the electronic efficiency is more than 50%, the second harmonic is below-30 dB, the group delay fluctuation is within 0.8ns, the saturation point phase shift is less than 40 degrees, and the third-order intermodulation is more than 10.5dB and other electrical performance indexes when the input rollback is 3 dB.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention. The embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (1)
1. The design method for the electrical performance of the spiral line slow-wave circuit of the L-band 500W space traveling wave tube is characterized by comprising the following steps of: the method specifically comprises an input modulation section, an output spiral line grouping section, an output spiral line synchronizing section and an output spiral line energy exchange section, wherein the synchronizing voltage of a slow wave circuit is 4700V, the total current is 255mA, and the method specifically comprises the following steps:
step 1, in an input modulation section, modulating an electron beam by adopting a gradual change pitch to form an alternating current component so as to reduce group delay fluctuation; gradually changing the pitch p1 to the pitch p2, wherein p1=1.71 mm, p2=1.85 mm, the total length of the input modulation section is 182.5mm, the corresponding length of the pitch of the section p1 is 68mm, the corresponding length of the pitch of the section p2 is 73.5mm, and the length of the gradual change section is 41mm;
step 2, forming alternating current with amplitude by adopting a pulse type pitch combined structure in an output spiral line clustered section, and simultaneously inhibiting harmonic fundamental wave amplitude; the pitch comprises a pitch p3, a pitch p4 and a pitch p5, wherein p3=1.99 mm, p4=1.88 mm and p5=2.06 mm, wherein the pitch corresponding to the first section of the pitch p3 is 104.5mm, the pitch corresponding to the second section is 5mm, the pitch corresponding to the first section of the pitch p4 is 20mm, the pitch corresponding to the second section is 13mm and the pitch corresponding to the pitch of the section p5 is 63mm;
step 3, in the output spiral line synchronization section, a double negative jump structure is adopted to control the wave phase speed of the line to maintain the synchronization relationship between the injection waves; the device comprises a screw pitch p5, a screw pitch p6 and a screw pitch p7, wherein p6=1.85 mm, p7=1.68 mm, and the lengths of the two gradual change sections are respectively 12.9mm and 18mm;
and 4, in the output spiral energy exchange section, the spiral energy exchange section comprises a pitch p7 and a pitch p8, wherein p7=1.68 mm and p8=2.1 mm, and the corresponding lengths of the two pitches are respectively 20mm and 2.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038231.1A CN112863976B (en) | 2021-01-12 | 2021-01-12 | Design method for electrical performance of spiral slow-wave circuit of L-band 500W space traveling wave tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110038231.1A CN112863976B (en) | 2021-01-12 | 2021-01-12 | Design method for electrical performance of spiral slow-wave circuit of L-band 500W space traveling wave tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112863976A CN112863976A (en) | 2021-05-28 |
| CN112863976B true CN112863976B (en) | 2024-02-06 |
Family
ID=76002964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110038231.1A Active CN112863976B (en) | 2021-01-12 | 2021-01-12 | Design method for electrical performance of spiral slow-wave circuit of L-band 500W space traveling wave tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112863976B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113690118B (en) * | 2021-07-29 | 2022-07-29 | 电子科技大学 | Novel helix slow wave structure with variable pitch and variable inner diameter |
| CN114520135A (en) * | 2021-12-31 | 2022-05-20 | 中国电子科技集团公司第十二研究所 | Design method for restraining harmonic waves of spiral line type traveling wave tube |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR969886A (en) * | 1948-07-23 | 1950-12-27 | Csf | Progressing wave tubes improvements |
| US4378512A (en) * | 1979-08-08 | 1983-03-29 | Nippon Electric Co., Ltd. | Helix type traveling wave tube |
| JPS5864737A (en) * | 1981-10-12 | 1983-04-18 | Nec Corp | Traveling-wave tube |
| JPH05225922A (en) * | 1992-02-12 | 1993-09-03 | Nec Corp | Helix type travelling-wave tube |
| CN102054645A (en) * | 2010-12-10 | 2011-05-11 | 安徽华东光电技术研究所 | Wideband traveling wave tube slow wave system and fabrication method thereof |
-
2021
- 2021-01-12 CN CN202110038231.1A patent/CN112863976B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR969886A (en) * | 1948-07-23 | 1950-12-27 | Csf | Progressing wave tubes improvements |
| US4378512A (en) * | 1979-08-08 | 1983-03-29 | Nippon Electric Co., Ltd. | Helix type traveling wave tube |
| JPS5864737A (en) * | 1981-10-12 | 1983-04-18 | Nec Corp | Traveling-wave tube |
| JPH05225922A (en) * | 1992-02-12 | 1993-09-03 | Nec Corp | Helix type travelling-wave tube |
| CN102054645A (en) * | 2010-12-10 | 2011-05-11 | 安徽华东光电技术研究所 | Wideband traveling wave tube slow wave system and fabrication method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112863976A (en) | 2021-05-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112863976B (en) | Design method for electrical performance of spiral slow-wave circuit of L-band 500W space traveling wave tube | |
| CN107452582B (en) | Broadband folding waveguide traveling wave tube capable of suppressing harmonic waves | |
| CN113113279B (en) | Cosine grid loading sine-like waveguide slow wave structure | |
| CN103489741B (en) | A kind of helix TWT dynamic phase velocity gradient pitch distributed architecture and method for designing | |
| CN102592924B (en) | Slow-wave system for Ka-band travelling wave tube and manufacturing method for slow-wave system | |
| CN111144050B (en) | Design method of strip traveling wave tube slow wave structure working in high-order mode | |
| CN104599924A (en) | Helix traveling wave tube with multiple stages of interaction systems | |
| CN109712854A (en) | A kind of the inhibition group delay distortion helix and design method of space travelling wave tube | |
| CN113690118B (en) | Novel helix slow wave structure with variable pitch and variable inner diameter | |
| CN102723250B (en) | Pitch hopping type spiral line for slow wave system of traveling wave tube | |
| CN113838727B (en) | Miniaturized high-power klystron based on single-ridge CeSRR unit | |
| CN114783849A (en) | Double-confocal waveguide cyclotron traveling wave tube input coupler based on coaxial resonant cavity structure | |
| Feng et al. | A novel design of G-band broadband low-gain fluctuation slow-wave structure with improved folded waveguides | |
| CN112464605A (en) | Optimization method of millimeter wave low noise amplifier and phase shifter combined system | |
| Gehrmann et al. | Filter helix for harmonic suppression in traveling wave tubes | |
| CN115565834A (en) | Multi-mode working traveling wave tube with adjustable power | |
| CN115270682A (en) | Ka-band broadband space traveling wave tube low-gain fluctuation design method | |
| CN117832039A (en) | Slow wave structure capable of realizing electronic phase positive jump, traveling wave tube and method | |
| CN219247807U (en) | Power amplifier module for improving efficiency and intermodulation of power amplifier | |
| CN111933500B (en) | Stepped energy coupling structure suitable for staggered double gates | |
| CN114864360B (en) | Ultra-wideband helix traveling wave tube and helix slow wave structure thereof | |
| Qiu et al. | The study of group delay distortion in Helix TWT | |
| Wang et al. | Q-band Helix Traveling-Wave Tube for the Next Generation Wireless Communications | |
| CN201294495Y (en) | Low-pass filter | |
| Liao et al. | The Second Harmonic Reduction in Helix Travelling Wave Tubes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |