CN108054070B - A kind of suppressing method of coupled-cavity TWT group delay - Google Patents
A kind of suppressing method of coupled-cavity TWT group delay Download PDFInfo
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- CN108054070B CN108054070B CN201711273673.4A CN201711273673A CN108054070B CN 108054070 B CN108054070 B CN 108054070B CN 201711273673 A CN201711273673 A CN 201711273673A CN 108054070 B CN108054070 B CN 108054070B
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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 discloses a kind of suppressing methods of coupled-cavity TWT group delay, comprising the following steps: S1, carries out cycle length scanning calculating to coupled-cavity TWT, obtains its dispersion characteristic curve；S2, the coupling slot opening angle for being gradually increased coupled-cavity TWT carry out cycle length scanning to the coupled-cavity TWT of each different coupling angle of the v-grooves respectively and calculate；S3, the different coupling slot opening angles of phase velocity having the same and the coupled-cavity TWT structure of cycle length are obtained；S4, the coupled-cavity TWT structure obtained to S3 carry out note wave interaction respectively and calculate, and will meet in the case where demanded power output the smallest coupling slot opening angle of group delay and cycle length as the final structure of coupled-cavity TWT.The present invention improves the synchronization extent of electronics note and wave in entire frequency band, effectively realizes the inhibition of group delay, meet group delay requirement of the travelling-wave tubes amplification complete machine to coupled-cavity TWT by rationally controlling coupling slot opening angle and cycle length.
Description
Technical field
The invention belongs to the non-linear field of coupled-cavity TWT, in particular to a kind of inhibition of coupled-cavity TWT group delay
Method.
Background technique
Coupled-cavity TWT one kind has high efficiency, high-gain, high power, the microwave amplifier of good heat radiating ability, mesh
Before, the coupled-cavity TWT of tens of kinds of models has been applied in the military electronics equipment on carrier-borne, airborne missile-borne and ground, while
Satellite, ground communication and remote sensing etc. are widely used.As the fields such as communication require increasingly timing tracking accuracy
It improves, required precision has reached 1~2ns.Requirement to the time precision of amplifier is also higher and higher, and the group of amplifier
The time delay that Shi Yanhui propagates signal has an impact, and then influence time synchronization accuracy and pseudo range measurement.The group delay of amplifier
Fluctuation has become the main systematic errors of time synchronization, however at present still to the research of coupled-cavity TWT group delay inhibition
Seldom, mechanism of production and suppressing method are still urgent problem, therefore are highly desirable research coupled-cavity TWT group
The suppressing method of time delay, the needs of to meet modern communications and electronic warfare.
Summary of the invention
It is long based on coupling slot opening angle and period that it is an object of the invention to overcome the deficiencies of the prior art and provide one kind
The suppressing method for spending the coupled-cavity TWT group delay of adjustment, in the premise for guaranteeing that coupled-cavity TWT output power is met the requirements
Under, by rationally controlling coupling slot opening angle and cycle length, improves the synchronization extent of electronics note and wave in entire frequency band, have
Effect realizes the inhibition of group delay, group delay can be reduced to 1ns hereinafter, meeting travelling-wave tubes amplification complete machine to coupler row
The group delay requirement of wave duct.
The purpose of the present invention is achieved through the following technical solutions: a kind of inhibition side of coupled-cavity TWT group delay
Method, comprising the following steps:
S1, the scanning that cycle length is carried out to coupled-cavity TWT calculate, and obtain its dispersion under different cycles length
Characteristic curve；
S2, the coupling slot opening angle that coupled-cavity TWT is gradually increased with angle certain every time, to each different couplings
The coupled-cavity TWT for closing the angle of the v-groove carries out cycle length scanning respectively and calculates, and obtains each different coupling slot opening angle and not
With the dispersion characteristic curve of the coupled-cavity TWT under cycle length；
Every S3, comparison dispersion characteristic curve obtain a series of difference couplings in same frequency point phase velocity having the same
The coupled-cavity TWT structure of channel opening angle and cycle length；
S4, the coupled-cavity TWT obtained to step S3 carry out note wave interaction respectively and calculate, obtain its output power and
Group delay, comparison group delay as a result, will meet the smallest coupling slot opening angle of group delay in the case where demanded power output and
Final structure of the cycle length as coupled-cavity TWT.
Further, in the step S4, the calculation method of group delay are as follows:
Wherein, τ is group delay, and Φ is field phase, and f is frequency.
The beneficial effects of the present invention are: being adjusted the invention proposes a kind of based on coupling slot opening angle and cycle length
Coupled-cavity TWT group delay suppressing method passes through conjunction under the premise of guaranteeing that coupled-cavity TWT output power is met the requirements
Reason control coupling slot opening angle and cycle length, so that before guaranteeing that coupler high-frequency structure phase velocity is constant at working frequency points
It puts and controls the variation of its group velocity, improve the synchronization extent of electronics note and wave in entire frequency band, effectively realize the inhibition of group delay,
Group delay can be reduced to 1ns hereinafter, meeting group delay requirement of the travelling-wave tubes amplification complete machine to coupled-cavity TWT.
Detailed description of the invention
Fig. 1 is the flow chart of the suppressing method of coupled-cavity TWT group delay of the invention；
Fig. 2 is Ka wave band coupled-cavity TWT illustraton of model in embodiment provided by the invention；
Fig. 3 is normalization phase of the Ka wave band coupled-cavity TWT under two groups of different parameters in embodiment provided by the invention
Speed figure；
Fig. 4 is output power of the Ka wave band coupled-cavity TWT under two groups of different parameters in embodiment provided by the invention
Comparison diagram；
Fig. 5 is group delay pair of the Ka wave band coupled-cavity TWT under two groups of different parameters in embodiment provided by the invention
Than figure.
Specific embodiment
Technical solution of the present invention is further illustrated with reference to the accompanying drawing.
As shown in Figure 1, a kind of suppressing method of coupled-cavity TWT group delay, comprising the following steps:
S1, the scanning that cycle length is carried out to coupled-cavity TWT calculate, and obtain its dispersion under different cycles length
Characteristic curve；
S2, the coupling slot opening angle that coupled-cavity TWT is gradually increased with angle certain every time, to each different couplings
The coupled-cavity TWT for closing the angle of the v-groove carries out cycle length scanning respectively and calculates, and obtains each different coupling slot opening angle and not
With the dispersion characteristic curve of the coupled-cavity TWT under cycle length；
Every S3, comparison dispersion characteristic curve obtain a series of difference couplings in same frequency point phase velocity having the same
The coupled-cavity TWT structure of channel opening angle and cycle length；
S4, the coupled-cavity TWT obtained to step S3 carry out note wave interaction respectively and calculate, obtain its output power and
Group delay, comparison group delay as a result, will meet the smallest coupling slot opening angle of group delay in the case where demanded power output and
Final structure of the cycle length as coupled-cavity TWT.
Further, in the step S4, the calculation method of group delay are as follows:
Wherein, τ is group delay, and Φ is field phase, and f is frequency.
Below by taking the fan-shaped Huges coupled-cavity travelling-wave tubes of a Ka wave band as an example, technical solution of the present invention is carried out detailed
It illustrates.It need to illustrate that the present invention is not limited to Ka wave band, but all general group delay of the coupled-cavity TWT of any structure is pressed down
Method processed.
For the coupled-cavity TWT of Ka wave band, using a kind of side adjusted based on coupling slot opening angle and cycle length
Method carries out group delay to the travelling-wave tubes and inhibits emulation, and guarantees that output power is greater than 1400W.
(1) a Ka wave band coupled-cavity TWT model is established, high-frequency structure is such as schemed using fan-shaped Hughes's type coupler
Shown in 2.Adjusting its initial coupling slot opening angle is 125 degree, and the scanning that different cycles length is carried out to it calculates, and obtains dispersion
Characteristic curve.
(2) coupling slot opening angle is gradually increased with angle certain every time, this step is regular adjustment opening
Then angle can also can be scanned the structure after each angulation change, every time from big to small from small to large
Angle increases few number for then needing to be scanned and increases, increased more, and the number for needing to be scanned is reduced, certainly by user
Row determines.The present embodiment is specially to increase to 175 degree from 125 degree, increases by 5 degree every time.To each different coupling channel openings
The scanning that the coupled-cavity TWT of angle carries out different cycles length calculates, and obtains their dispersion characteristic curve, compares its color
Characteristic curve is dissipated, discovery is in a certain Frequency point, and the curve of different openings angle and cycle length has intersection point, i.e., different structures exists
This point phase velocity having the same.In travelling-wave tubes, successfully to amplify electromagnetic wave signal, it is necessary to meet synchronous condition.Institute
Calling synchronous condition is exactly the phase velocity v of electromagnetic wave in slow wave systempOutline is less than velocity of electrons ve, therefore carrying out theoretical calculation
When, it is believed that the phase velocity of electromagnetic wave is equal with velocity of electrons.ByKnown to, with identical phase velocity
Structure synchronizing voltage and electric current having the same during interaction, so that velocity of electrons is also identical.But different couplers
The wave dispersion planarization of structure-borne is different, and group velocity is different, so the wave of different frequency is different from the synchronization extent of electronics, it
Group delay it is also different.If Fig. 3 is 125 degree of opening angle, cycle length 4.260mm (curve before optimization) and opening angle
175 degree, the normalization phase velocity comparison of cycle length 4.755mm (curve after optimization).
(3) first to 125 degree of coupling slot opening angle, the fan-shaped Huges coupled-cavity structure of cycle length 4.26mm carries out note wave
Interaction calculates, and wherein operating voltage is 17700V, and work synchronizing current is 500mA, obtains its output power and group delay, sends out
Its existing group delay is in 5ns or so.And requirement of the travelling-wave tubes amplification complete machine to the Group Delay Ripple of coupled-cavity TWT is, with interior group
Time delay fluctuation must not exceed 1.0ns, hence it is evident that 5ns is undesirable, needs to Optimal Structure Designing.One that (2) step is obtained
There is series the different structure of identical phase velocity to carry out interaction simulation calculation, and discovery is before guaranteeing that output power is greater than 1400W
Put, when coupling slot opening angle be 175 degree, cycle length be 4.755mm when, group delay minimum, and be reduced to 1ns with
Under.Therefore 175 degree are set by coupling slot opening angle, cycle length is set as 4.755mm.
In conclusion the present invention by taking a Ka wave band travelling-wave tubes as an example, proposes one under the premise of guaranteeing output power
Kind group delay suppressing method, i.e., under the premise of not having to change pipe other structures, by adjusting coupling slot opening angle and coupling
Chamber cycle length is closed, 125 degree of coupling slot opening angle, the coupling cavity configuration of cycle length 4.26mm is ultimately determined to angular aperture
175 degree of degree, the structure of cycle length 4.755mm.Fig. 4 is Ka wave band coupled-cavity TWT in the present embodiment in coupling slot angular aperture
Degree is set as 175 degree, and cycle length is set as 4.755mm and 125 degree of coupling slot opening angle, two groups of ginsengs of cycle length 4.26mm
Output power comparison diagram under several；Fig. 5 is that Ka wave band coupled-cavity TWT is set as in coupling slot opening angle in the present embodiment
175 degree, cycle length is set as 4.755mm and 125 degree of coupling slot opening angle, under two groups of different parameters of cycle length 4.26mm
Group delay comparison diagram.It is 125 degree of coupling slot opening angle before optimization in figure, the curve of cycle length 4.26mm is after optimization
Coupling slot opening angle is set as 175 degree, and cycle length is set as the curve of 4.755mm.As can be seen from Figure 4 and Figure 5, it uses
Group delay suppressing method of the invention can effectively optimize the synchronization extent of electronics and wave, effectively inhibition group delay, guarantee traveling wave
Pipe quality.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill disclosed the technical disclosures can make according to the present invention and various not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (1)
1. a kind of suppressing method of coupled-cavity TWT group delay, which comprises the following steps:
S1, the scanning that cycle length is carried out to coupled-cavity TWT calculate, and obtain its dispersion characteristics under different cycles length
Curve；
S2, the coupling slot opening angle for being gradually increased or reducing coupled-cavity TWT with certain angle every time, to it is each not
Coupled-cavity TWT with the coupling angle of the v-groove carries out cycle length scanning calculating respectively, obtains each different coupling slot opening angles
With the dispersion characteristic curve of the coupled-cavity TWT under different cycles length；
Every S3, comparison dispersion characteristic curve, obtain a series of opening in the different coupling slots of same frequency point phase velocity having the same
The coupled-cavity TWT structure of bicker degree and cycle length；
S4, note wave interaction calculating is carried out respectively to the coupled-cavity TWT that step S3 is obtained, when obtaining its output power and group
Prolong, compares group delay as a result, the smallest coupling slot opening angle of group delay in the case where demanded power output and period will be met
Final structure of the length as coupled-cavity TWT；
The calculation method of group delay are as follows:
Wherein, τ is group delay, and Φ is field phase, and f is frequency.
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| CN201711273673.4A CN108054070B (en) | 2017-12-06 | 2017-12-06 | A kind of suppressing method of coupled-cavity TWT group delay |
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| CN201711273673.4A CN108054070B (en) | 2017-12-06 | 2017-12-06 | A kind of suppressing method of coupled-cavity TWT group delay |
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| CN102710222B (en) * | 2012-05-31 | 2014-12-03 | 电子科技大学 | Linear signal conditioning driving device for traveling wave tube |
| CN107066642B (en) * | 2016-11-24 | 2020-05-12 | 电子科技大学 | Method for restraining time delay of space traveling wave tube group based on clamping rod adjustment |
| CN106920722B (en) * | 2016-11-24 | 2018-08-21 | 电子科技大学 | A kind of suppressing method of the space travelling wave tube group delay based on screw pitch adjustment |
| CN106898533B (en) * | 2016-11-24 | 2018-08-21 | 电子科技大学 | A kind of suppressing method of the space travelling wave tube group delay based on the adjustment of helix internal diameter |
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