CN102064068A - Slow wave structure for reducing harmonic output of coupled cavity traveling wave tube - Google Patents
Slow wave structure for reducing harmonic output of coupled cavity traveling wave tube Download PDFInfo
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- CN102064068A CN102064068A CN201010527981.7A CN201010527981A CN102064068A CN 102064068 A CN102064068 A CN 102064068A CN 201010527981 A CN201010527981 A CN 201010527981A CN 102064068 A CN102064068 A CN 102064068A
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Abstract
The invention discloses a slow wave structure for reducing harmonic output of a coupler traveling wave tube, which comprises a driving section, an output section and an absorber for separating the two sections, wherein the driving section and the output section consist of coupling cavities with different numbers, adjacent coupling cavities are separated by a diaphragm, coupling grooves are arranged on the diaphragm, the positions of the coupling grooves on the adjacent diaphragm are different, the phase difference of the coupling grooves on the adjacent diaphragm in the coupling cavities of the driving section and the output section is 180 degrees, the phase difference of the coupling grooves on the adjacent diaphragm at the tail end of a driving end is 90 degrees +/-15 degrees, and the phase difference of the coupling grooves on the adjacent diaphragm at the tail end of an output end is 90 degrees +/-15 degrees. The purpose of optimizing the spectral characteristics.
Description
Technical field
The invention belongs to the microwave vacuum field of electronic devices, be specifically related to a kind of slow wave structure that reduces the output of coupler travelling wave tube harmonic wave.
Background technology
Travelling wave tube has bandwidth, big, high, the reliability advantages of higher of efficient of gain as the vacuum microwave power amplifying device, has a wide range of applications in all kinds of military microwave transmitters, is described as " heart " of weaponry.Travelling wave tube can be divided into helix TWT, coupled-cavity TWT etc. according to its slow wave structure.Because coupling cavity slow wave structure heat dispersion is fine, can bear sizable power, so the coupling cavity slow wave structure is widely used in powerful travelling wave tube.
Adopt the travelling wave tube of coupling cavity slow wave structure generally to be applied in the various radar systems as final power amplifier spare.Because the quality of travelling wave tube output signal directly influences the performance of whole radar,, should have only try one's best little clutter noise and each harmonic (particularly second harmonic) output so generally require the frequency spectrum of travelling wave tube output signal clean.Travelling wave tube is that a kind of kinetic energy that utilizes high-velocity electrons to annotate and with the microwave signal mutual effect electronics is annotated is converted into microwave energy, reach the power amplifying device that amplifies function at last, because travelling wave tube is to make electromagnetic wave obtain gain with the clustering that electronics is annotated, so the abundant harmonic wave that electron bunching brought is that every travelling wave tube is all unavoidable.Particularly be operated under the state of gain saturation, the power output of its second harmonic is with considerable, and the output of each harmonic can influence the quality of the output signal of travelling wave tube, and finally influences the function of radar system.
Summary of the invention
The object of the present invention is to provide a kind of slow wave structure that reduces the output of coupler travelling wave tube harmonic wave, the each harmonic that solves in the coupled-cavity TWT power output frequency spectrum is exported for the travelling wave tube Effect on Performance.
To achieve these goals, the technical solution used in the present invention is:
The described this slow wave structure that reduces the output of coupler travelling wave tube harmonic wave comprises driving section and deferent segment, separates with absorber between two sections.Described driving section is made up of the different coupling cavity of number with deferent segment, separates by diaphragm between the adjacent coupling cavity.
Be equipped with coupling slot on the described diaphragm, the position difference of coupling slot on the adjacent diaphragms.Coupling slot is one on the described diaphragm, and coupling slot is a waist shape structure.The effect of coupling slot is that microwave signal is coupled in the coupling cavity and beam coupling.
The phase difference of coupling slot is 180 ° on the adjacent diaphragms in the coupling cavity of described driving section and deferent segment, the phase difference of coupling slot is 90 ° ± 15 ° on two adjacent diaphragms of drive end terminal position, and the phase difference of coupling slot is 90 ° ± 15 ° on two adjacent diaphragms of output terminal position.
By changing the phase difference that drives coupling slot between section and the terminal two adjacent diaphragms of output in the coupling cavity slow wave structure, can effectively reduce the each harmonic output in the power output frequency spectrum.
Its action principle is: the chromatic dispersion of the frequency band of coupled-cavity TWT slow wave structure is the chromatic dispersion of bearing usually, that is to say that first-harmonic is a backward-wave, but during the output of the each harmonic of coupled-cavity TWT slow wave system is not first-harmonic, but has the negative primary space harmonic wave of positive chromatic dispersion.When using coupling cavity slow wave system of the present invention, can effectively solve the quadratic space harmonic wave of negative primary space harmonic wave institute association.
If negative primary space harmonic wave phase shifts angle by each chamber in coupling cavity is
β wherein
-1Be the phase constant of negative primary space harmonic wave, L is the cycle of slow wave system.Then the move angle of the quadratic space harmonic wave of negative primary space harmonic wave is
Here use β
2Represent above-mentioned phase constant.When the coupling slot phase difference on the adjacent diaphragms was 180 °, negative primary space harmonic wave every chamber phase shift was
Corresponding electronics is annotated the transit angle of clustering piece in drift tube
The clustering electron block that microwave that this moment, coupling was come and drift tube transmit will continue to interact, and results of interaction is that microwave signal is strengthened, and power increases.
The phase velocity of the second harmonic of negative primary space harmonic wave is V
P2, then
Indicate down the parameter of-1 the negative primary space harmonic wave of representative in the formula, indicate the parameter of the second harmonic of 2 representative-1 space harmonic down.In the following formula, ω is an angular frequency, and f is a frequency.V wherein
P2Be the phase velocity of second harmonic, V
P-1Phase velocity for negative primary space harmonic wave.As seen the phase velocity of second harmonic equates with the phase velocity of negative primary space harmonic wave, therefore also equates with the speed that electronics is annotated, and still satisfies synchronous condition, the interaction that can continue, and results of interaction is that signal is strengthened, power increases.
When the coupling slot phase difference between adjacent diaphragms was become 90 ° by 180 °, the microwave that coupling is come from coupling slot will shift to an earlier date than the phase place of the clustering electron block that transmits by drift tube, and value is about in advance near the working point
Doubly.To negative primary space harmonic wave, phase place is worth in advance and is
For second harmonic, respective phase will become in advance
The microwave that phase place is mentioned will cause two kinds of different results with beam coupling the time: the result for negative primary space harmonic interaction is that power can be enhanced, and for second harmonic, the result of mutual effect is that power can be weakened.
When the coupling slot phase difference between adjacent diaphragms is become 90 ° by 180 °, power influences is less concerning negative primary space harmonic wave, and for its second harmonic, power will be decayed, also just reached and reduced the output of coupled-cavity TWT second harmonic power, the purpose of optimization spectral characteristic.
The invention has the advantages that: the described this slow wave structure that reduces the output of coupler travelling wave tube harmonic wave, by improvement to the coupled-cavity TWT slow wave structure, reduced the output of coupled-cavity TWT second harmonic power, make that the frequency spectrum of travelling wave tube output signal is clean, can effectively improve the travelling wave tube performance.
Description of drawings
Below the content of each width of cloth accompanying drawing expression of specification of the present invention and the mark among the figure are made brief description:
Fig. 1 is the described schematic diagram that reduces the slow wave structure of coupler travelling wave tube harmonic wave output;
Fig. 2 is that Fig. 1 is along A-A direction schematic cross-section;
Fig. 3 is that Fig. 1 is along B-B direction schematic cross-section;
Fig. 4 is-1 space harmonic signal stack schematic diagram;
The second harmonic signal stack schematic diagram of Fig. 5-1 space harmonic.
Mark among the above-mentioned figure is:
1, drives section; 2, deferent segment, 3, absorber, 4, coupling cavity, 5, diaphragm, 6, coupling slot.
Embodiment
Contrast accompanying drawing below, by description to embodiment, to the effect of the mutual alignment between the shape of the specific embodiment of the present invention such as related each member, structure, the each several part and annexation, each several part and operation principle etc., be described in further detail, inventive concept of the present invention, technical scheme had more complete, accurate and deep understanding to help those skilled in the art.
The slow wave structure that reduces the output of coupler travelling wave tube harmonic wave as described in Figure 1 comprises driving section 1 and deferent segment 2, separates with absorber 3 between two sections.Described driving section 1 is made up of the different coupling cavity 4 of number with deferent segment 2, separates by diaphragm 5 between the adjacent coupling cavity 4.
Be equipped with coupling slot 6 on the described diaphragm 5, the position difference of coupling slot 6 on the adjacent diaphragms 5.Coupling slot 6 is one on the described diaphragm 5, and coupling slot 6 is a waist shape structure.
The phase difference of coupling slot 6 is 180 ° on the adjacent diaphragms 5 in the coupling cavity 4 of described driving section 1 and deferent segment 2.
As shown in Figures 2 and 3, the phase difference of coupling slot 6 is 90 ° on two adjacent diaphragms 5 of drive end 1 terminal position, and the phase difference of coupling slot 6 is 90 ° on two adjacent diaphragms 5 of output 2 terminal positions.
As another embodiment of the invention, the phase difference of coupling slot 6 is 105 ° on two adjacent diaphragms 5 of drive end 1 terminal position, and the phase difference of coupling slot 6 is 105 ° on two adjacent diaphragms 5 of output 2 terminal positions.
As another embodiment of the invention, the phase difference of coupling slot 6 is 75 ° on two adjacent diaphragms 5 of drive end 1 terminal position, and the phase difference of coupling slot 6 is 75 ° on two adjacent diaphragms 5 of output 2 terminal positions.
Operation principle of the present invention is: the chromatic dispersion of the frequency band of coupled-cavity TWT slow wave structure is the chromatic dispersion of bearing usually, that is to say that first-harmonic is a backward-wave, but during the output of the each harmonic of coupled-cavity TWT slow wave system is not first-harmonic, but has the negative primary space harmonic wave of positive chromatic dispersion.When using coupling cavity slow wave system of the present invention, can effectively solve the quadratic space harmonic wave of negative primary space harmonic wave institute association.
As Fig. 4, shown in Figure 5, negative primary space harmonic wave phase shifts angle by each chamber in coupling cavity is
β wherein
-1Be the phase constant of negative primary space harmonic wave, L is the cycle of slow wave system.
Then the phase shifts angle of the quadratic space harmonic wave of negative primary space harmonic wave is
Here use β
2The phase constant of representing the quadratic space harmonic wave of above-mentioned negative primary space harmonic wave.When 6 phase differences of the coupling slot on the adjacent diaphragms 5 were 180 °, negative primary space harmonic wave every chamber phase shift was
Corresponding electronics is annotated the transit angle of clustering piece in drift tube
Microwave signal and electronics are annotated the interaction that can continue, and results of interaction all is that signal is strengthened, and power strengthens.
Calculate the phase velocity V of the second harmonic of negative primary space harmonic wave this moment
P2,
Indicate down the parameter of-1 the negative primary space harmonic wave of representative in the formula, indicate the parameter of the second harmonic of 2 representative-1 space harmonic down.ω is an angular frequency, and f is a frequency.V wherein
P2Be the phase velocity of second harmonic, V
P-1Phase velocity for negative primary space harmonic wave.As seen the phase velocity of second harmonic equates with the phase velocity of negative primary space harmonic wave, therefore also equates with the speed that electronics is annotated, and still satisfies synchronous condition, the interaction that can continue, and results of interaction is that signal is strengthened, power strengthens.
When coupling slot 6 phase differences with 5 of adjacent diaphragms became 90 ° by 180 °, the circuit ripple that coupling is come from coupling slot 6 will shift to an earlier date than the phase place of the clustering electron block that transmits by drift tube, and value is about in advance near the working point
Doubly.To negative primary space harmonic wave, phase place is worth in advance and is
For second harmonic, respective phase will become in advance
The microwave that phase place is mentioned will cause two kinds of different results with beam coupling the time: the result for negative primary space harmonic interaction is that power can be enhanced, and for second harmonic, the result of mutual effect is that power can be weakened.
When coupling slot 6 phase differences with 5 of adjacent diaphragms become 90 ° by 180 °, power influences is less concerning negative primary space harmonic wave, and for its second harmonic, power will be decayed, also just reached and reduced the output of coupled-cavity TWT second harmonic power, the purpose of optimization spectral characteristic.
Utilizing the described this slow wave structure that reduces coupler travelling wave tube output harmonic wave, is the coupled-cavity TWT of 1200W in certain X-band power output, and the power level of second harmonic has obtained good effect less than-55dBc.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (2)
1. one kind reduces the slow wave structure that coupler travelling wave tube harmonic wave is exported, comprise and drive section (1), deferent segment (2) and with two sections absorbers that separate (3), it is characterized in that: described driving section (1) is made up of the different coupling cavity of number (4) with deferent segment (2), separate by diaphragm (5) between the adjacent coupling cavity (4), described diaphragm (5) is provided with coupling slot (6), the phase difference of the last coupling slot (6) of adjacent diaphragms (5) is 180 ° in the coupling cavity (4) of described driving section (1) and deferent segment (2), the phase difference of going up coupling slot (6) at two adjacent diaphragms (5) of described drive end (1) terminal position is 90 ° ± 15 °, and the phase difference of going up coupling slot (6) at two adjacent diaphragms (5) of output (2) terminal position is 90 ° ± 15 °.
2. according to the described slow wave structure that reduces the output of coupler travelling wave tube harmonic wave of claim 1, it is characterized in that: it is one that described diaphragm (5) is gone up coupling slot (6), and coupling slot (6) is a waist shape structure.
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| CN201010527981A CN102064068B (en) | 2010-11-01 | 2010-11-01 | Slow wave structure for reducing harmonic output of coupled cavity traveling wave tube |
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| CN201010527981A CN102064068B (en) | 2010-11-01 | 2010-11-01 | Slow wave structure for reducing harmonic output of coupled cavity traveling wave tube |
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| CN102064068A true CN102064068A (en) | 2011-05-18 |
| CN102064068B CN102064068B (en) | 2012-09-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474315A (en) * | 2013-09-25 | 2013-12-25 | 南京三乐电子信息产业集团有限公司 | Slow wave circuit assembly with high-frequency load cutting structure |
| CN111640636A (en) * | 2020-06-09 | 2020-09-08 | 电子科技大学 | Traveling wave tube slow wave circuit working at positive and second spatial harmonics |
| CN113097034A (en) * | 2021-04-08 | 2021-07-09 | 山东建筑大学 | Slow wave structure based on coupling resonance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3123736A (en) * | 1964-03-03 | Severed traveling-wave tube with external terminations | ||
| US4019087A (en) * | 1975-03-20 | 1977-04-19 | Nippon Electric Company, Ltd. | Coupled-cavity type traveling-wave tube with sever termination attenuators |
| CN200965860Y (en) * | 2006-09-29 | 2007-10-24 | 安徽华东光电技术研究所 | A coupling cavity multi-beam traveling wave tube slow wave structure |
-
2010
- 2010-11-01 CN CN201010527981A patent/CN102064068B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3123736A (en) * | 1964-03-03 | Severed traveling-wave tube with external terminations | ||
| US4019087A (en) * | 1975-03-20 | 1977-04-19 | Nippon Electric Company, Ltd. | Coupled-cavity type traveling-wave tube with sever termination attenuators |
| CN200965860Y (en) * | 2006-09-29 | 2007-10-24 | 安徽华东光电技术研究所 | A coupling cavity multi-beam traveling wave tube slow wave structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474315A (en) * | 2013-09-25 | 2013-12-25 | 南京三乐电子信息产业集团有限公司 | Slow wave circuit assembly with high-frequency load cutting structure |
| CN111640636A (en) * | 2020-06-09 | 2020-09-08 | 电子科技大学 | Traveling wave tube slow wave circuit working at positive and second spatial harmonics |
| CN111640636B (en) * | 2020-06-09 | 2021-03-30 | 电子科技大学 | Traveling wave tube slow wave circuit working at positive and second spatial harmonics |
| CN113097034A (en) * | 2021-04-08 | 2021-07-09 | 山东建筑大学 | Slow wave structure based on coupling resonance |
| CN113097034B (en) * | 2021-04-08 | 2023-12-08 | 山东建筑大学 | Slow wave structure based on coupling resonance |
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| CN102064068B (en) | 2012-09-05 |
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Address after: 241000 No.01 Eshan Road, high tech Development Zone, Yijiang District, Wuhu City, Anhui Province Patentee after: ANHUI HUADONG PHOTOELECTRIC TECHNOLOGY INSTITUTE Co.,Ltd. Address before: 241000 Anhui Province, Wuhu city Yijiang District South high tech Development Zone Technology Park mansion Patentee before: Anhui Huadong Polytechnic Institute |