CN106920722B - A kind of suppressing method of the space travelling wave tube group delay based on screw pitch adjustment - Google Patents
A kind of suppressing method of the space travelling wave tube group delay based on screw pitch adjustment Download PDFInfo
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- CN106920722B CN106920722B CN201611041982.4A CN201611041982A CN106920722B CN 106920722 B CN106920722 B CN 106920722B CN 201611041982 A CN201611041982 A CN 201611041982A CN 106920722 B CN106920722 B CN 106920722B
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- group delay
- travelling wave
- wave tube
- screw pitch
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- 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
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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
- H01J23/26—Helical slow-wave structures; Adjustment therefor
- H01J23/27—Helix-derived slow-wave structures
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Abstract
The invention belongs to space travelling wave tube nonlinear technology field, the suppressing method of specially a kind of space travelling wave tube group delay based on screw pitch adjustment.The present invention is to control the synchronism deviation of electronics note and electromagnetic wave by adjusting interaction first segment screw pitch p0, so that interaction first segment angle of transformation is at 50 degree or so, in this way to sacrifice a small amount of output power as cost, so that group delay is inhibited significantly, its period of waves greatly reduces, and fluctuating range substantially reduces.In conclusion the present invention under the premise of ensureing that output power meets user's index in entire frequency range (>150W), group delay is significantly suppressed, and fluctuating range and period of waves are obviously reduced, mainly for the space travelling wave tube for communication.
Description
Technical field
The invention belongs to space travelling wave tube nonlinear technology field, specially a kind of space travelling wave tube based on screw pitch adjustment
The suppressing method of group delay.
Background technology
Space travelling wave tube (Space-borne TWT) is the transponder for being widely used in satellite and spacecraft, data transmission
The final power amplifier of system, radar and ECM transmitter etc..With the rapid development of China's aerospace industry, to space
The development and production of travelling-wave tube amplifier propose very urgent demand.
However every nonlinear characteristic in space travelling wave tube amplifier will have a direct impact on the globality of satellite and spacecraft
Can, wherein group delay influences the timing tracking accuracy and pseudo-ranging precision of the bit error rate of satellite communication, navigation system, this be because
It is a complicated dispersion system for travelling-wave tubes, nonlinear beam-wave interaction process will produce different frequency signals phase and differ
The group delay phenomenon of cause.But the inhibition of currently available technology travelling-wave tubes group delay research is still blank out, mechanism of production
It is a problem to be solved with suppressing method.Therefore it is highly desirable the suppressing method of group delay in research travelling-wave tubes.Wherein group
The definition of time delay is：
Wherein, τ is group delay, and Φ is field phase, and f is frequency.
Invention content
For above-mentioned there are problem or deficiency, ensureing that output power is more than user's index in entire range of frequency bandwidths
Under the premise of, the present invention provides a kind of suppressing methods of the space travelling wave tube group delay based on screw pitch adjustment.
The present invention proposes a kind of group delay Restrain measurement under the premise of ensureing that power meets user's index, specific as follows：
Step 1 emulates space travelling wave tube with microwave tube simulation suit (MTSS), obtains its initial output work
Rate and group delay；
Step 2, the initial pitch pitch (p0) for gradually increasing interaction first segment, each 0.001mm≤Δ pitch
≤ 0.1mm is incremental；P0 is incremented to interaction first segment angle of transformation between [- 40deg, -60deg], and is saturated meeting
Output power is more than 150W (user's index), records power, the interaction first segment angle of transformation that each screw pitch incrementally obtains
And group delay；
Step 3, pick out step 2 record group delay minimum point, finally record output power under screw pitch p0 with
Group delay.
The screw pitch p0 of helix TWT should carry out corresponding optimization design according to different frequency ranges, without departing from minimum
Power requirement and technological level.
The present invention under the premise of ensureing that output power meets user's index in entire frequency range (>150W), it utilizes
MTSS three-dimensional computations emulate screw pitch, can change the phase velocity of dispersion curve and to dispersion flattene degree by increasing screw pitch p0
It has little effect so that the phase velocity of electromagnetic wave and the speed of electronics are more nearly, and are just reduced electromagnetic wave in this way and are noted with electronics
Synchronism deviation (speed difference).Simultaneously when (angle of transformation is that field increases direction and field side to interaction first segment angle of transformation
To the physical quantity of angle, the increased speed in field is characterized, can directly be obtained in MTSS softwares) at [- 40deg, -60deg],
Electronics is noted by the relatively mild velocity modulation of electromagnetic wave and density modulation, will be formed cybotactic state more preferably electronics at this time and be noted, electricity
Electronics before the nonlinear characteristic of son note will also optimize significantly better than screw pitch is noted.Electromagnetic wave and electronics are improved by this method
The synchronization extent of note, and then the cybotactic state of electronics note is substantially improved, group delay is significantly suppressed after optimization, fluctuating range
It is obviously reduced with period of waves.Mainly for the space travelling wave tube for communication.
The present invention is to control the synchronism deviation of electronics note and electromagnetic wave by adjusting interaction first segment screw pitch p0 so that
Interaction first segment angle of transformation is in -50 degree left and right, in this way to sacrifice a small amount of output power as cost so that group delay is big
It is big to inhibit, greatly reduce period of waves, fluctuating range substantially reduces.
In conclusion the present invention under the premise of ensureing that output power meets user's index in entire frequency range (>
150W), group delay is significantly suppressed, and fluctuating range and period of waves are obviously reduced.
Description of the drawings
Fig. 1 is no fin rectangle supporting rod high-frequency structure figure；
Fig. 2 is the interaction screw pitch distribution map that gradual change is born in positive transition；
Fig. 3 is output power with axis distribution map；
Fig. 4 is initial population time lag curve；
Fig. 5 is before and after screw pitch p0 optimizes, and angle of transformation is with axis distribution curve comparison diagram；
Fig. 6 is power scan distribution curve comparison diagram before and after screw pitch p0 optimizations；
Fig. 7 is group delay scanning distribution curve comparison diagram before and after screw pitch p0 optimizations.
Specific implementation mode
Below by taking frequency range is the Ku wave band helix TWT of 11GHz-11.5GHz as an example, to the technology of the present invention
Scheme is described in further detail.
For the Ku wave band band helix TWTs of 11GHz-11.5GHz, group delay inhibition is carried out to the space travelling wave tube
Emulation provides that the minimum output power in the entire frequency range of user's index request is more than 150W first.
(1) with MTSS three-dimensional computations, the space travelling wave tube is emulated, and obtains its initial output power and group delay；
As depicted in figs. 1 and 2, using Ku wave band band helix TWTs, high-frequency structure is clamped using no fin rectangle
Bar, interacting formations bear gradient pitch distribution using positive transition.The initial of the space travelling wave tube can be directly obtained in MTSS
Output power and group delay, such as Fig. 3 and Fig. 4.Wherein initial group delay is 0.512ns.
(2) increase screw pitch (pitch), screw pitch is specially increased to 0.505mm from 0.45mm.
Optimization is scanned to interaction first segment screw pitch p0 using the three-dimensional computations of MTSS softwares.With Δ pitch=
0.01mm gradually increases screw pitch p0, when finding interaction first segment screw pitch p0=0.505mm, the relative phase of interaction first segment
Angle is -42 degree (see Fig. 5), in frequency range minimum saturation output power be 175W (>User's index of 150W) (see Fig. 6).Increase
Big screw pitch p0 is not only little to the influence of output power, and group delay is made to drop to 0.265ns, i.e. group delay by 0.512ns
Amount of suppression is 0.247ns, is reduced to 0 by 7 the period of waves of group delay, group delay curve approximation is straightway (see Fig. 7).
In conclusion the present embodiment by taking a 11GHz-11.5GHz helix TWT as an example, is used ensureing that power meets
Under the premise of the index of family, proposes group delay Restrain measurement, i.e., interaction first segment screw pitch p0 is increased to from 0.45mm
0.505mm.It can be seen that the present invention can effectively inhibit group delay distortion, while the average value of group delay is reduced,
The period of waves of group delay and fluctuating range also substantially reduce.But from examples it can be seen that for the spiral of different frequency range
Line travelling-wave tubes, as long as under the premise of ensureing that user's index is met the requirements, the specific size of screw pitch can be the present invention program's
On the basis of by optimization obtain.
Claims (3)
1. a kind of suppressing method of the space travelling wave tube group delay based on screw pitch adjustment, specific as follows：
Step 1 emulates space travelling wave tube with microwave tube simulation suit MTSS, obtains its initial output power and group
Time delay；
Step 2, the pitch pitch, that is, p0 for gradually increasing interaction first segment, every time with 0.001mm≤Δ pitch≤0.1mm
It is incremented by；P0 is incremented to interaction first segment angle of transformation between -40deg and -60deg, and is meeting saturation output power
More than 150W, power, interaction first segment angle of transformation and group delay that each screw pitch incrementally obtains are recorded；
Step 3, the point for picking out the group delay minimum that step 2 records, when finally recording output power and the group under screw pitch p0
Prolong.
2. the suppressing method of the space travelling wave tube group delay as described in claim 1 based on screw pitch adjustment, it is characterised in that：It is described
Space travelling wave tube is the space travelling wave tube for communication.
3. the suppressing method of the space travelling wave tube group delay as claimed in claim 2 based on screw pitch adjustment, it is characterised in that：It is described
The Ku waveband space travelling wave tubes that space travelling wave tube for communication is 11GHz-11.5GHz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611041982.4A CN106920722B (en) | 2016-11-24 | 2016-11-24 | A kind of suppressing method of the space travelling wave tube group delay based on screw pitch adjustment |
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|---|---|---|---|
| CN201611041982.4A CN106920722B (en) | 2016-11-24 | 2016-11-24 | A kind of suppressing method of the space travelling wave tube group delay based on screw pitch adjustment |
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| CN106920722A CN106920722A (en) | 2017-07-04 |
| CN106920722B true CN106920722B (en) | 2018-08-21 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108054070B (en) * | 2017-12-06 | 2019-12-03 | 电子科技大学 | A kind of suppressing method of coupled-cavity TWT group delay |
| CN109686635B (en) * | 2018-12-18 | 2020-12-29 | 电子科技大学 | Spiral line of space traveling wave tube and design method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5723948A (en) * | 1995-10-04 | 1998-03-03 | Nec Corporation | Helix travelling-wave tube with a maximum small signal gain at the operating voltage |
| CN105070623A (en) * | 2015-07-27 | 2015-11-18 | 电子科技大学 | Efficient broadband helix traveling wave tube |
| CN105304438A (en) * | 2015-11-20 | 2016-02-03 | 电子科技大学 | Secondary harmonic inhibition method for broadband helix travelling wave tube |
| CN106024554A (en) * | 2016-07-08 | 2016-10-12 | 电子科技大学 | High frequency design method for ultra-wideband helix traveling wave tube |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5513853B2 (en) * | 2008-11-06 | 2014-06-04 | 株式会社エヌエイチケイアイテック | Leaky coaxial cable |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5723948A (en) * | 1995-10-04 | 1998-03-03 | Nec Corporation | Helix travelling-wave tube with a maximum small signal gain at the operating voltage |
| CN105070623A (en) * | 2015-07-27 | 2015-11-18 | 电子科技大学 | Efficient broadband helix traveling wave tube |
| CN105304438A (en) * | 2015-11-20 | 2016-02-03 | 电子科技大学 | Secondary harmonic inhibition method for broadband helix travelling wave tube |
| CN106024554A (en) * | 2016-07-08 | 2016-10-12 | 电子科技大学 | High frequency design method for ultra-wideband helix traveling wave tube |
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